Processing the WM_COMMAND Message

To process menu commands, add the WM_COMMAND case to your application's main window procedure. Following is the WM_COMMAND case for the Label application's window procedure.

case WM_COMMAND: 
    switch (LOWORD(wParam)) 
    { 
        case IDM_CUT: 
            if (EditCopy()) 
                EditDelete(); 
            break; 
 
        case IDM_COPY: 
            EditCopy(); 
            break; 
 
        case IDM_PASTE: 
            EditPaste(); 
            break; 
 
        case IDM_DELETE: 
            EditDelete(); 
            break; 
 
        case IDM_EXIT: 
            DestroyWindow(hwnd); 
    } 
    break; 
 

To carry out the Copy and Cut commands, the window procedure calls the application-defined EditCopy function. For more information, see Copying Information to the Clipboard. To carry out the Paste command, the window procedure calls the application-defined EditPaste function. For more information about the EditPaste function, see Pasting Information from the Clipboard.