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Editorial Team
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Asked: 2026-06-13T15:26:07+00:00

When I create a dialog using DialogBox , it won’t close unless I handle

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When I create a dialog using DialogBox, it won’t close unless I handle WM_CLOSE in my own DLGPROC function and call EndDialog.

I know that this is by design, but I’m interested why was it chosen for WM_CLOSE not to be handled automatically by DefDlgProc? Are there any good reasons for that?

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  1. Editorial Team

    Ask yourself this:

    What would the default handling of WM_CLOSE be? Calling EndDialog? I think EndDialog would only work in very rare situations.

    Other suggestions:

    • validating user input in the dialog, showing errors if input is out-of-range or otherwise not valid, not ending the dialog
    • closing child windows, releasing resources/memory that child windows of the dialog are using, releasing COM-Objects, basically: cleaning up first and then end the dialog.
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