Search code examples
.netwinformswindows-messages

Difference between WM_CLOSE and SC_CLOSE

I just want to know what is the difference between these two messaging constants. Which one should I use in WndProc method when overriding, to handle close button message.

Solution

  • WM_CLOSE is sent as a window message whenever the window is requested to be closed, by any means.

    SC_CLOSE is sent as a parameter of a WM_SYSCOMMAND message, when the user presses the Close button (or selects Close from the control menu of the window).

    Which one you listen for is determined by which action(s) you attempting to intercept/deal with.