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Returns the window or control ID value for any child window, not only that of a control in a dialog box.

int GetDlgCtrlID( ) const;

The numeric identifier of the CWnd child window if the function is successful; otherwise 0.

Since top-level windows do not have an ID value, the return value of this function is invalid if the CWnd is a top-level window.

See the example for CWnd::OnCtlColor.

Header: afxwin.h