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All top-level windows in the system receive an OnFontChange call from the framework after the application changes the pool of font resources.

afx_msg void OnFontChange( );

An application that adds or removes fonts from the system (for example, through the AddFontResource or RemoveFontResource Windows function) should send the WM_FONTCHANGE message to all top-level windows.

To send this message, use the SendMessage Windows function with the hWnd parameter set to HWND_BROADCAST.

Header: afxwin.h