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window shutdown

The user starts the process by clicking the close button on the titlebar, or selecting a suitable menu item. This probably sends a WM_CLOSE message to the main window.

In response to the WM_CLOSE message, the main window calls the DestroyWindow function. This in turn sends WM_DESTROY and [WM_NCDESTROY] messages to the window.

In response to the WM_DESTROY message, the main window calls the PostQuitMessage function. This sends a WM_QUIT message to the application. This causes GetMessage to return zero, signaling the application to exit the message loop and the program.

49292 = 0xC08C