Re: SetClipboardViewer()

"ou" <>
Fri, 21 Dec 2007 09:29:02 +0900
Thanks joe.

If I launch clipbrd.exe firstly before my app, Yes, SetClipboardViewer()
returns a valid handle. By Spy++, I can confirm it is clipbrd's handle.

And then, I copy something by NOTEPAD or MSPAINT, by CMyDlg::WindowProc(UINT
message, WPARAM wParam, LPARAM lParam), I can catch WM_DRAWCLIPBOARD

After that, I exit clipbrd, I fail to catch WM_CHANGECBCHAIN message.

I think it is not necessary for a clipboard viewer to be a top window(CMyDlg
is a child-window).

Another question: should I return (LRESULT) NULL or call
CDialog::WindowProc(message, wParam, lParam) after dealing with

LRESULT CMyDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
     if ( message == WM_DRAWCLIPBOARD )
          ::SendMessage(hNextWnd, message, wParam, lParam);
          //Should I return NULL here?
          return (LRESULT) NULL
     else if ( message == WM_CHANGECBCHAIN )
          if (hNextWnd == (HWND) wParam )
               hNextWnd = (HWND) lParam;
          else if (hNextWnd != NULL)
           ::SendMessage(hNextWnd, message, wParam, lParam);

          //Should I return NULL here?
          return (LRESULT) NULL
     return CDialog::WindowProc(message, wParam, lParam);


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