I don't believe there is a method of CEdit that will do this explicitly, but you could write a method yourself.
char CEdit::GetCharByIndex(int nIndex)
{
CString wndText;
GetWindowText(wndText);
ASSERT ( nIndex < wndText.GetLength() );
return ( wndText.GetAt(nIndex) );
}
That's all off the top of my head. YMMV. :)