An application sends a CB_SETITEMDATA message to set the 32-bit value associated with the specified item in a combo box.
CB_SETITEMDATA
wParam = (WPARAM) index; // item index
lParam = (LPARAM) (DWORD) dwData; // item data
Parameters
index
Value of wParam. Specifies the item's zero-based index.
dwData
Value of lParam. Specifies the new value to be associated with the item.
Return Values
If an error occurs, the return value is CB_ERR.
Remarks
If the specified item is in an owner-drawn combo box created without the CBS_HASSTRINGS style, this message replaces the 32-bit value in the lParam parameter of the CB_ADDSTRING or CB_INSERTSTRING message that added the item to the combo box.
See Also