📄 vc++动态链接库编程之基础慨念2.htm

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<H1 id=pageName>VC++动态链接库编程之基础慨念</H1>
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<P>来源：天极网&nbsp;作者：&nbsp;2005-12-19&nbsp;出处：<A href="http://www.pcdog.com/" 
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<DIV class=keyword_list><BR><A class=link_keywords 
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<DIV class=story><STRONG>&nbsp;&nbsp;&nbsp; 3.库的调试与查看 
<P></P>
<P 
style="TEXT-INDENT: 2em"></STRONG>在具体进入各类DLL的详细阐述之前，有必要对库文件的调试与查看方法进行一下介绍，因为从下一节开始我们将面对大量的例子工程。</P>
<P 
style="TEXT-INDENT: 2em">由于库文件不能单独执行，因而在按下F5（开始debug模式执行）或CTRL+F5（运行）执行时，其弹出如图3所示的对话框，要求用户输入可执行文件的路径来启动库函数的执行。这个时候我们输入要调用该库的EXE文件的路径就可以对库进行调试了，其调试技巧与一般应用工程的调试一样。</P>
<P style="TEXT-INDENT: 2em"></P>
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<CENTER><A href="VC++动态链接库编程之基础慨念2.files/57388-3.jpg" target=_blank><IMG 
alt=VC++动态链接库编程之基础慨念（图三） src="VC++动态链接库编程之基础慨念2.files/57388-3.jpg" border=0></A>
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<P style="TEXT-INDENT: 2em" align=center>图3 库的调试与“运行”</P>
<P 
style="TEXT-INDENT: 2em">通常有比上述做法更好的调试途径，那就是将库工程和应用工程（调用库的工程）放置在同一VC工作区，只对应用工程进行调试，在应用工程调用库中函数的语句处设置断点，执行后按下F11，这样就单步进入了库中的函数。第2节中的libTest和libCall工程就放在了同一工作区，其工程结构如图4所示。</P>
<P style="TEXT-INDENT: 2em"></P>
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<CENTER><IMG alt=VC++动态链接库编程之基础慨念（图四） src="VC++动态链接库编程之基础慨念2.files/57388-4.jpg" 
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<P style="TEXT-INDENT: 2em" align=center>图4把库工程和调用库的工程放入同一工作区进行调试</P>
<P 
style="TEXT-INDENT: 2em">上述调试方法对静态链接库和动态链接库而言是一致的。所以本文提供下载的所有源代码中都包含了库工程和调用库的工程，这二者都被包含在一个工作区内，这是笔者提供这种打包下载的用意所在。</P>
<P style="TEXT-INDENT: 2em">动态链接库中的导出接口可以使用Visual 
C++的Depends工具进行查看，让我们用Depends打开系统目录中的user32.dll，看到了吧？红圈内的就是几个版本的MessageBox了！原来它真的在这里啊，原来它就在这里啊！</P>
<P style="TEXT-INDENT: 2em"></P>
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<CENTER><A href="VC++动态链接库编程之基础慨念2.files/57388-5.jpg" target=_blank><IMG 
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border=0></A></CENTER>
<P>
<P></P>
<P style="TEXT-INDENT: 2em"></P>
<P style="TEXT-INDENT: 2em" align=center>图5用Depends查看DLL</P>
<P 
style="TEXT-INDENT: 2em">当然Depends工具也可以显示DLL的层次结构，若用它打开一个可执行文件则可以看出这个可执行文件调用了哪些DLL。</P>
<P style="TEXT-INDENT: 2em">好，让我们正式进入动态链接库的世界，先来看看最一般的DLL，即非MFC DLL。<BR><SPAN 
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