改变RichEdit的游标位置

　　Delphi

// 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]) $#@62;= 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 $#@62; 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;