This message, sent by a client application, informs a server application that the specified item, or a particular clipboard format for the item, should no longer be updated. This terminates the warm or hot link for the specified item.
wParam
Identifies the sending window.
lParam
Specifies the data-request item to be canceled.
| Argument | Description |
| aItem | High-order word of lParam. An atom that specifies the data for which the update request is being retracted. When aItem is NULL, all active WM_DDE_ADVISE conversations associated with the client are to be terminated. |
| cfFormat | Low-order word of lParam. The clipboard format of the item that specifies the clipboard format for which the update request is being retracted. When cfFormat is NULL, all active WM_DDE_ADVISE conversations for the item are to be terminated. |
Posting
Post the WM_DDE_UNADVISE message by calling the PostMessage function, not SendMessage.
Allocate aItem by calling the GlobalAddAtom function.
Receiving
Post the WM_DDE_ACK message to respond positively or negatively. When posting WM_DDE_ACK, reuse the aItem atom or delete it and create a new one.