为什么在MFC程序代码中到不到Run（）和ExitInstance（）两个函数？

Answer 1

懂你得意思了，run()函数MFC里没有，功能类似的是InitInstance( )函数，工程创建的时候被自动创建在CxxxxApp类中，代码如下

BOOL CMy3DApp::InitInstance()
{
 AfxEnableControlContainer();

 // Standard initialization
 // If you are not using these features and wish to reduce the size
 //  of your final executable, you should remove from the following
 //  the specific initialization routines you do not need.

#ifdef _AFXDLL
 Enable3dControls();   // Call this when using MFC in a shared DLL
#else
 Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif

 CMy3DDlg dlg;
 m_pMainWnd = &dlg;
 int nResponse = dlg.DoModal();
 if (nResponse == IDOK)
 {
  // TODO: Place code here to handle when the dialog is
  //  dismissed with OK
 }
 else if (nResponse == IDCANCEL)
 {
  // TODO: Place code here to handle when the dialog is
  //  dismissed with Cancel
 }

 // Since the dialog has been closed, return FALSE so that we exit the
 //  application, rather than start the application's message pump.
 return FALSE;
}

 

ExitInstance()函数在工程创建的时候并没有创建，需要自己使用类向导创建在CxxxxAPP类中

创建后的代码为

int CMy3DApp::ExitInstance()
{
 // TODO: Add your specialized code here and/or call the base class
 
 return CWinApp::ExitInstance();
}
若满意请及时采纳，谢谢

追问

MFC的运行机制不就是: InitInstance()——Run()——ExitInstance() 吗？怎么会没有呢？

追答

你指的运行不是InitInstance()？app之后就是窗体的创建了，没有运行这个函数，创建窗体时有个InitDialog函数，你指的是它？它是创建窗体时首先要执行的函数

追问

应用程序运行过程是什么？不就是InitInstance()——Run()——ExitInstance吗？InitDialog是对话框初始化函数吧

追答

Run()函数在微软的APPCORE.CPP文件中，而这个文件已被编译成dll，你可以搜一下
// Main running routine until application exits
int CWinApp::Run()
{
if (m_pMainWnd == NULL && AfxOleGetUserCtrl())
{
// Not launched /Embedding or /Automation, but has no main window!
TRACE0("Warning: m_pMainWnd is NULL in CWinApp::Run - quitting application.\n");
AfxPostQuitMessage(0);
}
return CWinThread::Run();
}