Re: SetClipboardViewer()

Norbert Unterberg <nunterberg@newsgroups.nospam>
Thu, 20 Dec 2007 10:15:02 +0100
ou schrieb:

Env: WindowsXP, VC++6.00

In my app, SetClipboardViewer() is called and it returns NULL. So there are
no other windows in the clipboard viewer chain.

I wonder why mspaint, WORD and notepad are not added into the clipboard
viewer chain?

Why should they, they are no clipboard viewers.
SetClipboardViewer() is only usefull if you want to be notified when someone
else has changed the clipboard contents, It not required to implement the
classic copy/paste functions.

After I call SetClipboardViewer(), my app can receive WM_DRAWCLIPBOARD, but
not WM_CHANGECBCHAIN from WindowProc(). I don't know why?

WM_CHANGECBCHAIN is a helper message to maintain the linked list of clipboard
viewers, when one of the viewers is destroyed and needs to be removed from the
list. If you are the only clipboard viewer on your system, you will never
receive this message,

Try running multiple instances of your application and shut down some of them.
The others should receive the message then.


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