The HDM_GETITEMCOUNT message retrieves a count of the items in a header control. You can send this message explicitly or by using the Header_GetItemCount macro.
HDM_GETITEMCOUNT wParam = 0; lParam = 0;
If the operation succeeds, the return value is the number of items.
If the operation fails, the return value is - 1.
file: /Techref/os/win/api/win32/mess/src/msg08_7.htm, 1KB, , updated: 2000/4/7 11:20, local time: 2024/11/14 00:32,
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