The PSN_QUERYCANCEL notification message indicates that the user chose the Cancel button. This notification message is sent in the form of a WM_NOTIFY message.
PSN_QUERYCANCEL lpnmhdr = (NMHDR FAR *) lParam;
Returns TRUE to prevent the cancel operation or FALSE to allow it.
A property sheet page can use this notification message to ask the user to verify the cancel operation.
file: /Techref/os/win/api/win32/mess/src/msg15_7.htm, 1KB, , updated: 2000/4/7 11:20, local time: 2024/12/4 19:47,
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