Resetting Windows Desktop

This is a discussion on Resetting Windows Desktop within the C Programming forums, part of the General Programming Boards category; I have a legacy application that, on occasion, causes the windows fonts to screw up. I have found that, if ...

  1. #1
    Registered User JustMax's Avatar
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    Resetting Windows Desktop

    I have a legacy application that, on occasion, causes the windows fonts to screw up. I have found that, if I simply reset the desktop, it fixes the problem. I do not have the authority, knowledge, energy, nor desire to try and rewrite the legacy app.
    With that in mind, I have gotten the following code to launch the desktop manager to the point that I need it to be. I just need to send the enter key to the opened window and it should do what I need.
    Any hints on how I can get the desk.cpl to think the user has hit the enter key? AS you can see, I have tried the PostMessage function but that is not working.


    Code:
    void Reset( )
    {
     	HWND hwndDskTop;
        STARTUPINFO si;
        PROCESS_INFORMATION pi;
    	char cmd[255];
        ZeroMemory( &si, sizeof(si) );
        si.cb = sizeof(si);
        ZeroMemory( &pi, sizeof(pi) );
    			hwndDskTop = GetDesktopWindow(); 
    			SendMessage(hwndDskTop, WM_FONTCHANGE, 0, 0);
    			strcpy(cmd,"control.exe  desk.cpl desk,@Themes /Action:OpenTheme /File:");
    			strcat(cmd,"\"C:\\WINDOWS\\Resources\\Themes\\Windows Classic.theme\"");
    			if( !CreateProcess( NULL,				// No module name (use command line). 
    					cmd,	 
    					NULL,								// Process handle not inheritable. 
    					NULL,								// Thread handle not inheritable. 
    					FALSE,								// Set handle inheritance to FALSE. 
    					0,									// No creation flags. 
    					NULL,								// Use parent's environment block. 
    					NULL,								// Use parent's starting directory. 
    					&si,								// Pointer to STARTUPINFO structure.
    					&pi )								// Pointer to PROCESS_INFORMATION structure.
    				) 
    				{
    					MessageBox(NULL, "Reset has FAILED.","Error",MB_OK);
    				}
    			PostMessage (NULL, WM_KEYDOWN, VK_RETURN, 0);
        // Wait until child process exits.
        WaitForSingleObject( pi.hProcess, INFINITE );
    
        // Close process and thread handles. 
        CloseHandle( pi.hProcess );
        CloseHandle( pi.hThread );
    }

  2. #2
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    I'd imagine that it probably isn't encouraged, but if the 'Display' window has keyboard focus, then keybd_event( VK_RETURN, MapVirtualKey( VK_RETURN, 0 ), NULL, NULL ) should work.

    Note that you'll also have to call it with the third argument as KEYEVENTF_KEYUP after you want it to stop being pressed.

  3. #3
    Registered User JustMax's Avatar
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    That doesn't seem to work. I know the window has keyboard focus because it responds to both the escape and enter keys when I press them.
    Last edited by JustMax; 04-25-2009 at 07:09 AM.

  4. #4
    Registered User JustMax's Avatar
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    DeadPlanet,
    I added this line between the CreateProcess and the keybd_event :
    Code:
    WaitForSingleObject( pi.hProcess, (DWORD)5000 );
    and it appears to be working. Thanks for the help.

  5. #5
    'Allo, 'Allo, Allo
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    This isn't going to be distributed to anyone but yourself is it?

  6. #6
    Registered User JustMax's Avatar
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    It will placed in an application that calls the old app. It will reset the desktop when the old app closes and returns control to the new app.

    Do you see an issue I am missing?

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