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Thread: Why is desktop dc flickering?

  1. Nov 25th, 2002, 11:36 PM #1
    cyborg
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    Why is desktop dc flickering?

    hi!
    my prog draws something to the desktop dc, but when im running a game, it starts to flicker!
    why?
    do i have to draw it at the same time as the game draws?
    Last edited by cyborg; Nov 26th, 2002 at 12:07 AM.
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  2. Nov 25th, 2002, 11:57 PM #2
    cyborg
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    if i set a form to allways on top, it doesnt flicker, but the things i draw on the desktopdc with setpixelv flickers
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  3. Nov 26th, 2002, 12:17 AM #3
    Sastraxi
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    You need to use LockWindowUpdate(GetDesktopWindow) before your SetPixelV calls and then LockWindowUpdate(ByVal 0) after it.... I think. Not sure about the 2nd part, look up how to use LockWindowUpdate.
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  4. Nov 26th, 2002, 12:30 AM #4
    cyborg
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    ok! thanks!
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  6. Nov 26th, 2002, 01:44 AM #5
    cyborg
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    hey!
    if i put LockWindowUpdate GetDesktopWindow first and LockWindowUpdate ByVal 0 after, this it what happens:

    lock; drawing stuff not possible
    then draw my stuff, but the DC is locked so it doesnt draw
    unlock; drawing stuff is possible


    if i put it in the other oder:

    unlock; drawing stuff is possible
    then draw my stuff
    lock; drawing stuff not possible



    so what happens is:
    the first way, nothing happens!
    the second way, my stuff is drawn but NO other things, so the screen looks the same all the time untill i press ctrl+alt+del!
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