In Win32, you can not show MessageBox after calling PostQuitMessage() until calling GetMessage to get out of message loop.
In MFC dialog app, the dialog is set to m_pMainWnd and when dialog is closed, PostQuitMessage is called. If you want to show MessageBox after the dialog closed, there is two method to do this.
Method 1, Keep m_pMainWnd to NULL.
Comment out the following line so that m_pMainWnd is not set.
m_pMainWnd = &dlg; |
Method 2, Call PumpMessage to call GetMessage.
Calling PumpMessage until it returns false. After that you can show MessageBox.
while(PumpMessage()) ; |