delphi双击TMemo选择光标所在行

procedure SelectMemoLine(Memo : TCustomMemo) ;
var
   Line : integer;
begin
   with Memo do
   begin
     Line := Perform(EM_LINEFROMCHAR, SelStart, 0) ;
     SelStart := Perform(EM_LINEINDEX, Line, 0) ;
     SelLength := Length(Lines[Line]) ;
   end;
end;

//Usage:
procedure TForm1.Memo1Click(Sender: TObject) ;
begin
   SelectMemoLine(Memo1) ;
end;