An application sends a CB_GETITEMDATA message to a combo box to retrieve the application-supplied 32-bit value associated with the specified item in the combo box.
CB_GETITEMDATA wParam = (WPARAM) index; // item index lParam = 0; // not used; must be zero
The return value is the 32-bit value associated with the item. If an error occurs, it is CB_ERR.
If the item is in an owner-drawn combo box created without the CBS_HASSTRINGS style, the return value is the 32-bit value contained in the lParam parameter of the CB_ADDSTRING or CB_INSERTSTRING message that added the item to the combo box. If the CBS_HASSTRINGS style was not used, the return value is the lParam parameter contained in a CB_SETITEMDATA message.
CB_ADDSTRING, CB_INSERTSTRING, CB_SETITEMDATA
file: /Techref/os/win/api/win32/mess/src/msg01_22.htm, 1KB, , updated: 2000/4/7 12:19, local time: 2024/9/4 08:18,
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