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TCN_SELCHANGE

TCN_SELCHANGE 
    lpnmhdr = (LPNMHDR) lParam; 

Notifies a tab control's parent window that the currently selected tab has changed. This message is sent in the form of a WM_NOTIFY message.

• No return value.

lpnmhdr

Address of an NMHDR structure. The hwndFrom member is the handle to the tab control. The idFrom member is the child window identifier of the tab control. The code member is TCN_SELCHANGE.

To determine the currently selected tab, use the TabCtrl_GetCurSel macro.

See also TCN_SELCHANGING

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