Processing the WM_DESTROYCLIPBOARD Message

A window can process the WM_DESTROYCLIPBOARD message in order to free any resources that it set aside to support delayed rendering. For example the Label application, when copying a label to the clipboard, allocates a local memory object. It then frees this object in response to the WM_DESTROYCLIPBOARD message, as follows.

case WM_DESTROYCLIPBOARD: 
    if (pboxLocalClip != NULL) 
    { 
        LocalFree(pboxLocalClip); 
        pboxLocalClip = NULL; 
    } 
    break;