Question

vc6对话框应用程序

BOOL CPLC6100App::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

CPLC6100Dlg dlg;
m_pMainWnd = &dlg;
int nResponse = dlg.DoModal();
if (nResponse == IDOK)
{
// TODO: Place code here to handle when the dialog is
// dismissed with OK
CMainDlg dlgMain;
dlgMain.DoModal();
}
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;

}
为什么我的dlgMain对话框一闪就消失了,程序也就结束了

Answer 1

原因是你点CPLC6100Dlg的OK按钮时，对话框就退出了，紧接着主线程也退出了，所以你的dlgMain对话框就一闪而过了。
你可以把你的dlgMain和CPLC6100Dlg的关系互换一下，现在假设CPLC6100Dlg是你的dlgMain，这样做：
BOOL CPLC6100App::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
//看这里
CMainDlg dlg;
if(dlg.DoModal() != IDOK)
return false;

CPLC6100Dlg dlgMain;
m_pMainWnd = &dlgMain;
int nResponse = dlgMain.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;

}