LRESULT CALLBACK MainWndProc ( HWND hWnd,  UINT message,WPARAM wParam, LPARAM lParam )

• {

• switch ( message )

• {

• case WM_COMMAND: /* Menu Selection or Dialog Box Control */

• switch (wParam)

• { case CM_EXIT: /* ID of the EXIT menu item */

• DestroyWindow ( hWnd );

• case CM_MESSAGE_TO_SCREEN; /* another menu item */

• MessageBox( hWnd, "Message Text", ”Message Title", MB_OK);

• default:

• return ( DefWindowProc ( hWnd, message, wParam, lParam ) );

• }

• default:

• return ( DefWindowProc ( hWnd, message, wParam, lParam ) );

• }

• }

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