CWnd::GetWindowTextLength
Visual Studio 2010
Returns the length of the CWnd object caption title.
int GetWindowTextLength( ) const;
If CWnd is a control, the GetWindowTextLength member function returns the length of the text within the control instead of the caption.
This member function causes the WM_GETTEXTLENGTH message to be sent to the CWnd object.
See the example for CWnd::SetWindowText.