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Editorial Team
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Asked: 2026-06-12T23:01:57+00:00

When exactly is WM_PAINT called? Im trying to create a dialog based slot machine

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When exactly is WM_PAINT called? Im trying to create a dialog based slot machine application, but i’ve run into a couple of logical issues. My application will consist of:

  • “Spin” Button
  • Exit Button
  • Three BMP images to display the results of the spin(coin/heart/soldier)

How will i show the final result of the spin using the BMP images? Am i correct in using WM_PAINT to attempt to display the images, how will i refresh the screen each time the user presses the spin button to show the new images? I really appreciate the help!

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1 Answer

  1. Editorial Team

    Dialog boxes normally use DefDlgProc as the window procedure. You can’t handle WM_PAINT in your DialogProc (it isn’t a window procedure). You can use your own window procedure with a dialog but that’s probably more trouble than it’s worth.

    The simplest way to display a bitmap on a dialog is to use a static control with the SS_BITMAP style.

    You can change the displayed bitmap by sending the STM_SETIMAGE message to the static control. The control will take care of repainting itself with the new bitmap.

    This is OK if you just want to display the result of a spin, but won’t work very well if you want to animate the spinning of the reels. To handle this you could create your own static control (i.e. a window for each reel) that would display a portion of a reel bitmap.

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