The TCM_GETCURSEL message determines the currently selected tab in a tab control. You can send this message explicitly or by using the TabCtrl_GetCurSel macro.
TCM_GETCURSEL
wParam = 0; // not used; must be zero
lParam = 0; // not used; must be zero
Return Values
Returns the index of the selected tab if successful or - 1 if no tab is selected.
See Also