Hi

I have a Qt GUI application which I can run from the Microsoft command line window. One of the options on the command line is for the application is to do some work (a batch job) and then quit. During the time the application is running I can stop the application by pressing ctrl-c in the command line window. The application will stop but not gracefully, it dies somewhere in Qt (qpaint something). How can I intercept Ctrl-c or hook into Qt/application shutting down so I can clean up properly?

I've looked at QSessionManager. I've tried using

Qt Code: 
  1. if( QSysInfo::WindowsVersion >= QSysInfo::WV_XP )
  2. 	{
  3. 		// type of the pointer function to retrieve from the library 
  4. 		typedef BOOL (WINAPI* PFN_AttachConsole)(DWORD);
  5.  
  6. 		// get the module
  7. 		HMODULE hModule= ::GetModuleHandleA( "kernel32.dll" );
  8. 		// get the pointer to the function 
  9. 		PFN_AttachConsole fpAttachConsole = (BOOL (_stdcall *)(DWORD)) GetProcAddress( hModule, "AttachConsole" );
  10.  
  11. 		// check if the pointer is valid and retrieve the parent console 
  12. 		if( (NULL != fpAttachConsole) &&  (0 != fpAttachConsole( (DWORD)-1 )) )
  13. 		{	
  14. 			// Process escape characters
  15. 			SetConsoleMode( hModule, ENABLE_PROCESSED_OUTPUT | ENABLE_PROCESSED_INPUT );				
  16. 			m_hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );
  17. 			m_bSuccess = true;
  18. 		}		
  19. 	}
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I think a problem with the above it is not attached to a 'true' console and I so can't switch off ctrl-c (unless the above code is wrong?)

I have also tried windows functions

Qt Code: 
  1. SetConsoleCtrlHandler( (PHANDLER_ROUTINE) gFnConsoleCtrlHandler, TRUE )
  2.  
  3. Using my function
  4. BOOL gFnConsoleCtrlHandler( DWORD fdwCtrlType ) 
  5. { 
  6. 	switch( fdwCtrlType ) 
  7. 	{ 
  8. 		// Handle the CTRL-C signal. 
  9. 	case CTRL_C_EVENT: 
  10. 		printf( "Ctrl-C event\n\n" );
  11. 		//gFnApp_TidyUpOnExit(); Idea was to call something like this
  12. 		return( TRUE );
  13.  
  14. 		// CTRL-CLOSE: confirm that the user wants to exit. 
  15. 	case CTRL_CLOSE_EVENT: 
  16. 		printf( "Ctrl-Close event\n\n" );
  17. 		return( TRUE ); 
  18.  
  19. 		// Pass other signals to the next handler. 
  20. 	case CTRL_BREAK_EVENT: 
  21. 		printf( "Ctrl-Break event\n\n" );
  22. 		return FALSE; 
  23.  
  24. 	case CTRL_LOGOFF_EVENT: 
  25. 		printf( "Ctrl-Logoff event\n\n" );
  26. 		return FALSE; 
  27.  
  28. 	case CTRL_SHUTDOWN_EVENT: 
  29. 		printf( "Ctrl-Shutdown event\n\n" );
  30. 		return FALSE; 
  31.  
  32. 	default: 
  33. 		return FALSE; 
  34. 	} 
  35. }
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but again this gets ignored

Ideally I would like to intercept the ctrl-c key, visit my tidy up function then let the app quit gracefull and keep Qt happy.

Any suggestions welcome