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汶上信息港»汶上中都社區(qū) › 電腦綜合 › 技術(shù)文獻(xiàn) › 在 Visual C++ 中使用內(nèi)聯(lián)匯編

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在 Visual C++ 中使用內(nèi)聯(lián)匯編

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發(fā)表于 2008-9-28 16:24:03 | 只看該作者 |倒序?yàn)g覽 |閱讀模式

<SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">一、內(nèi)聯(lián)匯編的優(yōu)缺點(diǎn)</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   因?yàn)樵赩isual C++中使用內(nèi)聯(lián)匯編不需要額外的編譯器和聯(lián)接器，且可以處理Visual C++中不能處理的一些事情，而且可以使用在C/C++中的變量，所以非常方便。內(nèi)聯(lián)匯編主要用于如下場(chǎng)合: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   1.使用匯編語(yǔ)言寫函數(shù)；<BR>   2.對(duì)速度要求非常高的代碼；<BR>   3.設(shè)備驅(qū)動(dòng)程序中直接訪問(wèn)硬件；<BR>   4."Naked" Call的初始化和結(jié)束代碼。<BR>     //(."Naked"，理解了意思，但是不知道怎么翻譯^_^，大概就是不需要C/C++的編譯器(自作聰明)生成的函數(shù)初始化和收尾代碼，請(qǐng)參看MSDN的"Naked <I>function</I>s"的說(shuō)明)<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   內(nèi)聯(lián)匯編代碼不易于移植，如果你的程序打算在不同類型的機(jī)器（比如x86和Alpha）上運(yùn)行，應(yīng)當(dāng)盡量避免使用內(nèi)聯(lián)匯編。這時(shí)候你可以使用MASM，因?yàn)镸ASM支持更方便的的宏指令和數(shù)據(jù)指示符。<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">二、內(nèi)聯(lián)匯編關(guān)鍵字</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   在Visual C++使用內(nèi)聯(lián)匯編用到的是__asm關(guān)鍵字，這個(gè)關(guān)鍵字有兩種使用方法: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   1.簡(jiǎn)單__asm塊 <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 2 <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 0xD007 <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OUT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>       }<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   2.在每條匯編指令之前加__asm關(guān)鍵字  <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 2 <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 0xD007 <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OUT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   因?yàn)開_asm關(guān)鍵字是語(yǔ)句分隔符，因此你可以把匯編指令放在同一行: <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 2     __asm </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 0XD007    __asm </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OUT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   顯然，第一種方法和C/C++的風(fēng)格很一致，并且有很多其它優(yōu)點(diǎn)，因此推薦使用第一種方法。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   不象在C/C++中的"{}"，__asm塊的"{}"不會(huì)影響C/C++變量的作用范圍。同時(shí)，__asm塊可以嵌套，嵌套也不會(huì)影響變量的作用范圍。<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">三、在<SPAN lang=EN-US>__asm塊中使用匯編語(yǔ)言</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   1.內(nèi)聯(lián)匯編指令集 <BR>   內(nèi)聯(lián)匯編完全支持的Intel 486指令集，允許使用MMX指令。不支持的指令可以使用_EMIT偽指令定義(_EMIT偽指令說(shuō)明見下文)。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   2.MASM表達(dá)式 <BR>   內(nèi)聯(lián)匯編可以使用MASM中的表達(dá)式。比如: MOV EAX, 1。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   3.數(shù)據(jù)指示符和操作符 <BR>   雖然__asm塊中允許使用C/C++的數(shù)據(jù)類型和對(duì)象，但它不能用MASM指示符和操作符定義數(shù)據(jù)對(duì)象。這里特別指出，__asm塊中不允許MASM中的定義指示符: DB、DW、DD、DQ、DT和DF，也不允許DUP和THIS操作符。MASM結(jié)構(gòu)和記錄也不再有效，內(nèi)聯(lián)匯編不接受STRUC、RECORD、WIDTH或者M(jìn)ASK。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   4.EVEN和ALIGN指示符 <BR>   盡管內(nèi)聯(lián)匯編不支持大多數(shù)MASM指示符，但它支持EVEN和ALIGN，當(dāng)需要的時(shí)候，這些指示符在匯編代碼里面加入NOP(空操作)指令使標(biāo)號(hào)對(duì)齊到特定邊界。這樣可以使某些處理器取指令時(shí)具有更高的效率。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   5.MASM宏指示符 <BR>   內(nèi)聯(lián)匯編不是宏匯編，不能使用MASM宏指示符(MACRO、REPT、IRC、IRP和ENDM)和宏操作符(<>、!、&、%和.TYPE)。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   6.段說(shuō)明 <BR>   必須使用寄存器來(lái)說(shuō)明段，跨越段必須顯式地說(shuō)明，如ES:[BX]。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   7.類型和變量大小 <BR>   我們可以使用LENGTH來(lái)取得C/C++中的數(shù)組中的元素個(gè)數(shù)，如果不是一個(gè)數(shù)組，則結(jié)果為一。使用SIZE來(lái)取得C/C++中變量的大小，一個(gè)變量的大小是LENGTH和TYPE的乘積。TYPE用來(lái)取得一個(gè)變量的大小，如果是一個(gè)數(shù)組，它得到的一個(gè)數(shù)組中的單個(gè)元素的大小。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   8.注釋 <BR>   可以使用C/C++的注釋，但推薦用ASM的注釋，即";"號(hào)。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   9._EMIT偽指令 <BR>   _EMIT偽指令相當(dāng)于MASM中的DB，但一次只能定義一個(gè)字節(jié)，比如: <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     _CodeOfAsm <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">           _EMIT   0x00    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 定義混合在代碼段的數(shù)據(jù) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>           _EMIT   0x01 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       _CodeOfAsm: <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 這里是代碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>           _EMIT   0x90    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; NOP指令 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>       }<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">四、在<SPAN lang=EN-US>__asm塊中使用C/C++語(yǔ)言元素</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   C/C++與匯編可以混合使用，在內(nèi)聯(lián)匯編可以使用C/C++的變量和很多其它C/C++的元素。在__asm塊中可以使用以下C/C++元素: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   1.符號(hào)，包括標(biāo)號(hào)、變量和函數(shù)名； <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   2.常量，包括符號(hào)常量和枚舉型(enum)成員； <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   3.宏定義和預(yù)處理指示符； <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   4.注釋，包括"/**/"和"//"； <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   5.類型名，包括所有MASM中合法的類型 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   6.typedef名稱， 像PTR、TYPE、特定的結(jié)構(gòu)成員或枚舉成員這樣的通用操作符。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   在__asm塊中，可以使用C/C++或ASM的基數(shù)計(jì)數(shù)法(比如: 0x100和100H是相等的)。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   __asm塊中不能使用像<<一類的C/C++操作符。C/C++和MASM通用的操作符，比如"*"和"[]"操作符，都被認(rèn)為是匯編語(yǔ)言的操作符。舉個(gè)例子: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> array[[10]]; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> array[[6]], </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">BX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> ;  Store </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">BX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> at array+6 (</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">not</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> scaled) <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       array[[6]] = 0;         </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* Store 0 at array+12 (scaled) */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   * 小技巧: 內(nèi)聯(lián)匯編中，你可以使用TYPE操作符使作其與C一致。比如，下面兩條語(yǔ)句是一樣的: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> array[[6 * TYPE </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> ], 0 ; Store 0 at array + 12 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       array[[6]] = 0;                   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* Store 0 at array + 12 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   內(nèi)聯(lián)匯編能通過(guò)變兩名直接引用C/C++的變量。__asm塊中可以引用任何符號(hào)，包括變量名。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   如果C/C++中的類、結(jié)構(gòu)或者枚舉成員具有唯一的名稱，如果在"."操作符之前不指定變量或者typedef名稱，則__asm塊中只能引用成員名稱。然而，如果成員不是唯一的，你必須在"."操作符之前加上變量名或typedef名稱。例如，下面的兩個(gè)結(jié)構(gòu)都具有same_name這個(gè)成員變量: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">struct</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> first_type <BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> *weasel; <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> same_name; <BR>       }; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">struct</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> second_type <BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> wonton; <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">long</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> same_name; <BR>       }; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   如果按下面聲明變量: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">struct</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> first_type hal; <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">struct</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> second_type oat; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   那么，所有引用same_name成員的地方都必須使用變量名，因?yàn)閟ame_name不是唯一的。另外，上面的weasel變量具有唯一的名稱，你可以僅僅使用它的成員名稱來(lái)引用它: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, OFFSET hal <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">]hal.same_name </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 必須使用 'hal'</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ESI</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">].weasel       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 可以省略 'hal'</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>       } <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   注意，省略了變量名僅僅是為了寫代碼的方便，生成的匯編指令的還是一樣的。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   可以不受限制地訪問(wèn)C++成員變量，但是不能調(diào)用C++的成員函數(shù)。<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">五、寄存器使用</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   一般來(lái)說(shuō)，在__asm塊開始的時(shí)候，寄存器是空的，不能在兩個(gè)__asm之間保存寄存器的值。(這是MSDN上說(shuō)的，我在實(shí)際使用時(shí)發(fā)現(xiàn)，好像并不是這樣。不過(guò)它是說(shuō)"一般"，我是特殊:)) <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   如果一個(gè)函數(shù)被聲明成了__fastcall，則其參數(shù)將放在寄存器中，這將給寄存器的管理帶來(lái)問(wèn)題。所以，如果要將一個(gè)函數(shù)聲明成__fastcall，必須保存ECX寄存器。為了避免以上的沖突，在聲明為__fastcall的函數(shù)中不要有__asm塊。如果用了/Gr編譯選項(xiàng)(它全局的變成__fastcall)，將每個(gè)函數(shù)聲明成__cdecl或者_(dá)_stdcall，這個(gè)屬性告訴編譯器用傳統(tǒng)的C方法。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   如果使用EAX、EBX、ECX、EDX、ESI和EDI寄存器，你不需要保存它；但如果你用到了DS、 SS、SP、BP和標(biāo)志寄存器，那就應(yīng)該P(yáng)USH保存這些寄存器。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   如果程序中改變了用于STD和CLD的方向標(biāo)志，你必須將其恢復(fù)到原來(lái)的值。<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">六、轉(zhuǎn)跳</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   可以在C里面使用goto調(diào)到__asm塊中的標(biāo)號(hào)處，也可以在__asm塊中轉(zhuǎn)跳到__asm塊里面和外面的標(biāo)號(hào)處。__asm塊內(nèi)的標(biāo)號(hào)是不區(qū)分大小寫的(指令、指示符等也是不區(qū)分大小寫的)。例: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">void</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> func() <BR>       { <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">goto</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> C_Dest;    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* 合法 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">goto</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> c_dest;    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* 錯(cuò)誤 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">goto</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> A_Dest;    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* 合法 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">goto</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> a_dest;    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* 合法 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               { <BR>                       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> C_Dest  </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 合法</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>                       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> c_dest  </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; MSDN上說(shuō)合法，但是我在VS.NET中編譯，認(rèn)為這樣不合法</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">                       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> A_Dest  </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 合法</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>                       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> a_dest  </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 合法</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       a_dest:     ; </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 標(biāo)號(hào) <BR>               } <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       C_Dest:     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* C的標(biāo)號(hào) */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">return</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR>       } <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   不要使用函數(shù)名稱當(dāng)作標(biāo)號(hào)，否則將使其跳到函數(shù)執(zhí)行而不是標(biāo)號(hào)處。如下所示: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 錯(cuò)誤: 使用函數(shù)名作為標(biāo)號(hào) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNE</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> exit <BR>       . <BR>       . <BR>       . <BR>       exit: <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 下面是更多的ASM代碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   美元符號(hào)$用于指定當(dāng)前位置，如下所用，常用于條件跳轉(zhuǎn): <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNE</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> $+5 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 下面這條指令的長(zhǎng)度是5個(gè)字節(jié) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> farlabel <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">;$+5，跳到了這里 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>       . <BR>       . <BR>       . <BR>       farlabel: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">七、調(diào)用函數(shù)</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   內(nèi)聯(lián)匯編調(diào)用C/C++函數(shù)必須自己清除堆棧，下面是一個(gè)調(diào)用C/C++函數(shù)例子: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: red">#include</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <stdio.h> <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szformat[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"%s %s\n"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szHello[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"Hello"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szWorld[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">" world"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">void</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> main() <BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           { <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, OFFSET szWorld <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, OFFSET szHello <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, OFFSET szformat <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">CALL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    printf <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//內(nèi)聯(lián)匯編調(diào)用C函數(shù)必須自己清除堆棧 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//用不使用的EBX寄存器清除堆棧，或ADD ESP, 12 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">POP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">POP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">POP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           } <BR>       } <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   注意:函數(shù)參數(shù)是從右向左壓棧。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   不能夠訪問(wèn)C++中的類成員函數(shù)，但是可以訪問(wèn)extern "C"函數(shù)。 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   如果調(diào)用Windows API函數(shù)，則不需要自己清除堆棧，因?yàn)锳PI的返回指令是RET n，會(huì)自動(dòng)清除堆棧 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   比如下面的例子: <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: red">#include</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <windows.h> <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szAppName[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"API Test"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">void</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> main() <BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szHello[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"Hello, world!"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           { <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    MB_OK </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> MB_ICONINformATION <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    OFFSET szAppName    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 全局變量用OFFSET</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LEA</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, szHello        </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 局部變量用LEA</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    0 <BR>               </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">CALL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    DWORD PTR [MessageBoxA]     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 注意這里，我費(fèi)了好大周折才發(fā)現(xiàn)不是CALL MessageBoxA</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>           } <BR>       } <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   一般來(lái)說(shuō)，在Visual C++中使用內(nèi)聯(lián)匯編是為了提高速度，因此這些函數(shù)調(diào)用盡可能用C/C++寫。<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">八、一個(gè)例子</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   下面的例子是在VS.NET(即VC7)中C語(yǔ)言寫的。先建一個(gè)工程，將下列代碼放到工程中的.c文件中編譯，無(wú)需作特別的設(shè)置，即可編譯通過(guò)。<o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//預(yù)處理 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: red">#include</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <Windows.h> <BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//全局變量 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   HWND g_hWnd; <BR>   HINSTANCE g_hInst; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   TCHAR szTemp[1024]; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   TCHAR szAppName[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"CRC32 Sample"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//函數(shù)聲明 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   DWORD GetCRC32(const BYTE *pbData, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> nSize); <BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> iCmdShow); <BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LRESULT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">CALLBACK</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam); <BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//主函數(shù) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> iCmdShow) <BR>   { <BR>       MSG msg; <BR>       WNDCLASSEX wndClassEx; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       g_hInst = hInstance; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       wndClassEx.cbSize = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">sizeof</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">(WNDCLASSEX); <BR>       wndClassEx.style = CS_VREDRAW | CS_HREDRAW; <BR>       wndClassEx.lpfnWndProc = (WNDPROC) WindowProc; <BR>       wndClassEx.cbClsExtra = 0; <BR>       wndClassEx.cbWndExtra = 0; <BR>       wndClassEx.hInstance = g_hInst; <BR>       wndClassEx.hIcon = LoadIcon(NULL, IDI_APPLICATION); <BR>       wndClassEx.hCursor = LoadCursor(NULL, IDC_ARROW); <BR>       wndClassEx.hbrBackground = (HBRUSH) (COLOR_WINDOW); <BR>       wndClassEx.lpszMenuName = NULL; <BR>       wndClassEx.lpszClassName = szAppName; <BR>       wndClassEx.hIconSm = NULL; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       RegisterClassEx(&wndClassEx); <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       g_hWnd = CreateWindowEx(0, szAppName, szAppName, WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICK<I>FRame</I> | WS_MINIMIZEBOX, <BR>           CW_USEDEFAULT, CW_USEDEFAULT, 300, 70, <BR>           NULL, NULL, g_hInst, NULL); <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       ShowWindow(g_hWnd, iCmdShow); <BR>       UpdateWindow(g_hWnd); <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">while</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (GetMessage(&msg, NULL, 0, 0)) <BR>       { <BR>           TranslateMessage(&msg); <BR>           DispatchMessage(&msg); <BR>       } <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">return</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> ((</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">) msg.wParam); <BR>   } <BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//主窗口回調(diào)函數(shù) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LRESULT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">CALLBACK</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) <BR>   { <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">switch</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (uMsg) <BR>       { <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">case</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WM_CREATE: <BR>           CreateWindowEx(WS_EX_CLIENTEDGE, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"EDIT"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | ES_AUTOHSCROLL | ES_AUTOVSCROLL | ES_NOHIDESEL | WS_OVERLAPPED, <BR>               7, 12, 220, 22, <BR>               hWnd, (HMENU)1000, g_hInst, NULL); <BR>           CreateWindowEx(0, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"BUTTON"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"&OK"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | WS_OVERLAPPED | BS_FLAT, <BR>               244, 12, 40, 20, <BR>               hWnd, (HMENU)IDOK, g_hInst, NULL); <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">break</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">case</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WM_COMMAND: <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">switch</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (LOWORD(wParam)) <BR>           { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">case</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> IDOK: <BR>               GetDlgItemText(g_hWnd, 1000, szTemp + 100, 800); <BR>               wsprintf(szTemp, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"當(dāng)前文本框內(nèi)的字符串的CRC32校驗(yàn)碼是: 0x%lX"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, GetCRC32(szTemp + 100, (</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">)strlen(szTemp + 100))); <BR>               MessageBox(g_hWnd, szTemp, szAppName, MB_OK|MB_ICONINformATION); <BR>           } <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">break</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">case</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WM_DESTROY: <BR>           PostQuitMessage(0); <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">break</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">default</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">: <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">return</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (DefWindowProc(hWnd, uMsg, wParam, lParam)); <BR>       } <BR>       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">return</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (0); <BR>   } <BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//GetCRC32: 求字節(jié)流的CRC32校驗(yàn)碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//參數(shù): </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//      pbData: 指向字節(jié)流緩沖區(qū)首地址 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//      nSize: 字節(jié)流長(zhǎng)度 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//返回值: </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//      字節(jié)流的CRC32校驗(yàn)碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//這里使用查表法求CRC32校驗(yàn)碼，這部分是參考老羅的文章《 矛與盾的較量（2）——CRC原理篇》該寫的。 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//原文的具體內(nèi)容請(qǐng)參看: <A href="http://www.luocong.com/articles/show_article.asp?Article_ID=15" target=_blank>http://www.luocong.com/articles/show_article.asp?Article_ID=15</A> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//下面使用內(nèi)聯(lián)匯編求CRC32校驗(yàn)碼，充分使用了CPU中的寄存器，速度和方便性都是使用C/C++所不能比擬的 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>   DWORD GetCRC32(const BYTE *pbData, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> nSize) <BR>   { <BR>       DWORD dwCRC32Table[256]; <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//這片內(nèi)聯(lián)匯編是初始化CRC32表 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 256 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   _NextTable: <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LEA</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">-1] <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 8 <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   _NextBit: <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">SHR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 1 <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNC</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     _NotCarry <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">XOR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 0xEDB88320 <BR>   _NotCarry: <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">DEC</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNZ</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     _NextBit <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">POP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     [dwCRC32Table + </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">*4 - 4], </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">DEC</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNZ</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     _NextTable <BR>       } <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">       </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//下面是求CRC32校驗(yàn)碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR>       { <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, -1 <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, pbData <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">      </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JZ</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">      _Done <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, nSize <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">      </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JZ</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">      _Done <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   _NextByte: <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">] <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">XOR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOVZX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EDX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">SHR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 8 <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">XOR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [dwCRC32Table + </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EDX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">*4] <o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">INC</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LOOP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">    _NextByte <BR>   _Done: <BR>           </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">NOT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">     </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR>       } <BR>   } <BR>   </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">////////////////////////////////////////////////////////////////////////////////////////////////////</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN></P>

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