The WM_ASKCBFORMATNAME message is sent to the clipboard owner by a clipboard viewer window to request the name of a CF_OWNERDISPLAY clipboard format.
WM_ASKCBFORMATNAME cchName = (DWORD) wParam // size of buffer lpszFormatName = (LPTSTR) lParam // buffer to receive format name
If an application processes this message, it should return zero.
In response to this message, the clipboard owner should copy the name of the owner-display format to the specified buffer, not exceeding the buffer size specified by the cchName parameter.
A clipboard viewer window sends this message to the clipboard owner to determine the name of the CF_OWNERDISPLAY format ¾ for example, to initialize a menu listing available formats.