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Editorial Team
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Asked: 2026-05-15T03:21:52+00:00

Does anyone know how MessageBox(…) could fail silently? MessageBox(g_hMainhWnd, buffer, Oops!, MB_OK | MB_ICONERROR);

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Does anyone know how MessageBox(…) could fail silently?

MessageBox(g_hMainhWnd, buffer, "Oops!", MB_OK | MB_ICONERROR);

ShellExecute(0, "open", "http://intranet/crash_handler.php", NULL, "", SW_SHOWNORMAL);

For a little context, this code is called inside our own exception handler, which was registered with SetUnhandledExceptionFilter()

Most of the time, I see the message box, and then it launches a web browser.

However, I have an exe, which as far as I’m aware uses this exact code, and it successfully launches the web browser, but I do not see the message box first.

Thanks

Tim

Cracked it. I tried deliberately passing in a garbage HWND and the message box didn’t appear.

Thanks Brian!

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1 Answer

  1. Editorial Team

    Just an idea but maybe g_hMainhWnd is invalid? See if it works when you put NULL for the first parameter.

    I would suggest to call GetLastError after the call and write the output to a file. That way you can see what Windows thinks the error is. The MSDN MessageBox documentation mentions that it sets GetLastError for this API and if it fails it returns zero.

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