An application sends a CB_SELECTSTRING message to search the list of a combo box for an item that begins with the characters in a specified string. If a matching item is found, it is selected and copied to the edit control.
CB_SELECTSTRING wParam = (WPARAM) indexStart; // item before first selection lParam = (LPARAM) (LPCSTR) lpszSelect; // address of prefix string
If the string is found, the return value is the index of the selected item. If the search is unsuccessful, the return value is CB_ERR and the current selection is not changed.
A string is selected only if the characters from the starting point match the characters in the prefix string.
If you create the combo box with an owner-drawn style but without the CBS_HASSTRINGS style, what the CB_SELECTSTRING message does depends on whether you use the CBS_SORT style. If the CBS_SORT style is used, the system sends WM_COMPAREITEM messages to the owner of the combo box to determine which item matches the specified string. If you do not use the CBS_SORT style, CB_SELECTSTRING attempts to match the DWORD value against the value of the lpszSelect parameter.
CB_FINDSTRING, CB_FINDSTRINGEXACT, CB_SETCURSEL, WM_COMPAREITEM
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