RichEdit行号相关

请问在RichEdit中我想将游标(文字)移动到某一位置要怎麽用呢？

我用SendMessage可以取得行数、列数,然後要用那个叁数或是函数才能移动游标呢？

这个需要自已处理, 例如本信所附的程式 --

// 指定输入游标的位置
procedure SetCaret(RTF: TRichEdit; var Row, Col: word);
var
  i, iStopLine, iSelStart: integer;
begin
  if (RTF = nil) then Exit;
  if Row = 0 then Row := 1;
  if Col = 0 then Col := 1;

  // 到第 Row 列, Col 行共几个字元
  iStopLine := Row - 1;
  iSelStart := 0;
  for i := 0 to RTF.Lines.Count - 1 do
  begin
    if i = iStopLine then
    begin
      if Length(RTF.Lines[i]) >= Col then
        Inc(iSelStart, Col)
      else
        Inc(iSelStart, Length(RTF.Lines[i]) + 2);
      Break;
    end;
    Inc(iSelStart, Length(RTF.Lines[i]) + 2);
  end;
  if iSelStart > 0 then Dec(iSelStart);

  // 以设定标记的方式指定游标位置
  SendMessage(RTF.Handle, EM_SETSEL, iSelStart, iSelStart);

  // 再次侦测游标位置
  Row := SendMessage(RTF.Handle, EM_LINEFROMCHAR, RTF.SelStart, 0);
  Col := RTF.SelStart - SendMessage(RTF.Handle, EM_LINEINDEX, Row, 0);

  // 卷到游标所在位置
  SendMessage(RTF.Handle, EM_SCROLLCARET, 0, 0);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  iRow, iCol: word;
begin
  iRow := 17;
  iCol := 3;
  SetCaret(RichEdit1, iRow, iCol);
  RichEdit1.SetFocus;
end;