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    <TD>AFX_EXT_API</TD>
    <TD>#ifdef _AFXEXT<BR>　AFX_API_EXPORT<BR>#else<BR>　AFX_API_IMPORT</TD></TR>
  <TR>
    <TD>AFX_EXT_DATA</TD>
    <TD>#ifdef 
  _AFXEXT<BR>　AFX_DATA_EXPORT<BR>#else<BR>　AFX_DATA_IMPORT</TD></TR></TBODY></TABLE><BR>　　<B>6.2 
MFC扩展DLL导出MFC派生类</B><BR><BR>　　在这个例子中，我们将产生一个名为“ExtDll”的MFC扩展DLL工程，在这个DLL中导出一个对话框类，这个对话框类派生自MFC类CDialog。<BR><BR>　　使用MFC向导生成MFC扩展DLL时，系统会自动添加如下代码：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>static AFX_EXTENSION_MODULE ExtDllDLL = { NULL, NULL };<BR>extern "C" 
      int APIENTRY<BR><BR>DllMain( HINSTANCE hInstance, DWORD dwReason, LPVOID 
      lpReserved )<BR>{<BR>　// Remove this if you use 
      lpReserved<BR><BR>　UNREFERENCED_PARAMETER( lpReserved 
      );<BR><BR>　//说明：lpReserved是一个被系统所保留的参数，对于隐式链接是一个非零值，对于显式链接值是零<BR><BR>　if 
      (dwReason == DLL_PROCESS_ATTACH)<BR>　{<BR>　　TRACE0( "EXTDLL.DLL 
      Initializing!\n" );<BR>　　// Extension DLL one-time initialization<BR>　　if 
      ( !AfxInitExtensionModule( ExtDllDLL, hInstance ))<BR>　　　return 
      0;<BR>　　　// Insert this DLL into the resource chain<BR>　　new 
      CDynLinkLibrary( ExtDllDLL );<BR>　}<BR>　else if (dwReason == 
      DLL_PROCESS_DETACH)<BR>　{<BR>　　TRACE0( "EXTDLL.DLL Terminating!\n" 
      );<BR>　　// Terminate the library before destructors are 
      called<BR>　　AfxTermExtensionModule( ExtDllDLL );<BR>　}<BR>　return 1; // 
      ok<BR>}</TD></TR></TBODY></TABLE><BR>　　这一段代码含义晦涩，我们需要对其进行解读：<BR><BR>　　（1）上述代码完成MFC扩展DLL的初始化和终止处理；<BR><BR>　　（2）初始化期间所创建的 
CDynLinkLibrary 对象使MFC扩展 DLL 可以将 DLL中的CRuntimeClass 
对象或资源导出到应用程序；<BR><BR>　　（3）AfxInitExtensionModule函数捕获模块的CRuntimeClass 结构和在创建 
CDynLinkLibrary 对象时使用的对象工厂（COleObjectFactory 
对象）；<BR><BR>　　（4）AfxTermExtensionModule函数使 MFC 得以在每个进程与扩展 DLL 
分离时（进程退出或使用AfxFreeLibrary卸载DLL时）清除扩展 DLL；<BR><BR>　　（5）第一条语句static 
AFX_EXTENSION_MODULE ExtDllDLL = { NULL, NULL 
};定义了一个AFX_EXTENSION_MODULE类的静态全局对象，AFX_EXTENSION_MODULE的定义如下：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>struct AFX_EXTENSION_MODULE<BR>{<BR>　BOOL bInitialized;<BR>　HMODULE 
      hModule;<BR>　HMODULE hResource;<BR>　CRuntimeClass* 
      pFirstSharedClass;<BR>　COleObjectFactory* 
  pFirstSharedFactory;<BR>};</TD></TR></TBODY></TABLE><BR>　　由AFX_EXTENSION_MODULE的定义我们可以更好的理解（2）、（3）、（4）点。<BR><BR>　　在资源编辑器中添加一个如图15所示的对话框，并使用MFC类向导为其添加一个对应的类CExtDialog，系统自动添加了ExtDialog.h和ExtDialog.cpp两个头文件。<BR><BR>
<TABLE width="90%" align=center border=0>
  <TBODY>
  <TR>
    <TD>
      <DIV align=center><IMG 
      src="VC++动态链接库编程之MFC扩展 DLL-开发者网络-dll-天极Yes1ky.files/z44bxd805tf3.jpg" 
      border=0><BR>图15 
MFC扩展DLL中的对话框</DIV></TD></TR></TBODY></TABLE><BR>　　修改ExtDialog.h中CExtDialog类的声明为：<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
  <TBODY>
  <TR>
    <TD>class AFX_EXT_CLASS CExtDialog : public 
      CDialog<BR>{<BR>　public:<BR>　　CExtDialog( CWnd* pParent = NULL ); 
      <BR>　　enum { IDD = IDD_DLL_DIALOG };<BR>　protected:<BR>　　virtual void 
      DoDataExchange( CDataExchange* pDX ); 
  <BR>　　DECLARE_MESSAGE_MAP()<BR>};</TD></TR></TBODY></TABLE><BR>　　这其中最主要的改变是我们在class 
AFX_EXT_CLASS CExtDialog语句中添加了“AFX_EXT_CLASS”宏，则使得DLL中的CExtDialog类被导出。<BR><BR>
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