afx_msg void OnDrawClipboard();
Called for each window in the Clipboard-viewer chain when the contents of the Clipboard change. Only applications that have joined the Clipboard-viewer chain by calling the SetClipboardViewer member function need to respond to this call.
Each window that receives an OnDrawClipboard call should call the SendMessage Windows function to pass a WM_DRAWCLIPBOARD message on to the next window in the Clipboard-viewer chain. The handle of the next window is returned by the SetClipboardViewer member function; it may be modified in response to an OnChangeCbChain member function call.
This message-handler member function calls the Default member function. Override this member function in your derived class to handle the WM_DRAWCLIPBOARD message.
::SendMessage, CWnd::SetClipboardViewer, WM_CHANGECBCHAIN, CWnd::Default