Clipboard backup (Visual C++)

Introduction
This piece of code is to help you backup your clipboard data and restore it after you have finished other clipboard operations.

My experience: while I'm developing Word add-in programs, the icon of the new-added button can only be set through clipboard by "...->PasteFace()". This will empty the clipboard data which is going to be pasted in Word. So, I wrote this class, and it helped me a lot.

Usage:

// the constructor will do backup clipboard operation
CClipboardBackup cbbackup;

// any other clipboard operations
::OpenClipboard(NULL);
::EmptyClipboard();
::SetClipboardData(......);
::CloseClipboard();
....

// restore
cbbackup.Restore();

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