MessageBox with Help button

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Showing a four-button message box with the default set to the fourth button:

int WINAPI WinMain(HINSTANCE hinst, HINSTANCE hinstPrev,
LPSTR lpCmdLine, int nShowCmd)
return MessageBox(NULL, TEXT(“Four buttons!”), TEXT(“Title”), MB_ABORTRETRYIGNORE | MB_HELP | MB_DEFBUTTON4);

Clicking on the Help button (MB_HELP) is documented as sending a WM_HELP message to your program. Since there is nothing to catch that message, it does nothing. The other buttons return the ID value of that button, dismissing the message box.


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A tough developer who likes to work on just about anything, from software development to electronics, and share his knowledge with the rest of the world.

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