TCustomCombo.SetItemIndex(const Value: Integer);

procedure TCustomCombo.SetItemIndex(const Value: Integer);
begin
if csLoading in ComponentState then
FItemIndex := Value
else
if GetItemIndex <> Value then
SendMessage(Handle, CB_SETCURSEL, Value, 0);
end;

CB_SETCURSEL message

• 05/31/2018
• 2 minutes to read
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An application sends a CB_SETCURSEL message to select a string in the list of a combo box. If necessary, the list scrolls the string into view. The text in the edit control of the combo box changes to reflect the new selection, and any previous selection in the list is removed.

Parameters

wParam

Specifies the zero-based index of the string to select. If this parameter is -1, any current selection in the list is removed and the edit control is cleared.

lParam

This parameter is not used.

Return value

If the message is successful, the return value is the index of the item selected. If wParam is greater than the number of items in the list 实际测试，超过时，之前的选择不会被清除or if wParam is -1, the return value is CB_ERR and the selection is cleared.

Requirements