本文整理自网络，侵删。
当RichEdit为可用状态时，是不用代码控制此操作的，TRichEdit本身就可以定位光标。但是当RichEdit开始不可用时，则此方法就可能用到了。本例中RichEdit1开始时是不可用的，当在ApplicationEvents1中接收到RichEdit1被双击时则设置RichEdit1的Enable := true;并且定位光标。
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ComCtrls, RichEdit, AppEvnts;
type
TForm1 = class(TForm)
RichEdit1: TRichEdit;
ApplicationEvents1: TApplicationEvents;
procedure EnableRichEdit;
procedure ApplicationEvents1Message(var Msg: tagMSG; var Handled: Boolean);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
FLastMousePos: TPoint;
implementation
{$R *.dfm}
procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG;
var Handled: Boolean);
var
mPos: TPoint;
begin
if msg.message = WM_LBUTTONDBLCLK then begin
if msg.hwnd = RichEdit1.Parent.Handle then begin
GetCursorPos(FLastMousePos);
EnableRichEdit;
end;
end ;
end;
procedure TForm1.EnableRichEdit;
var
cPos: TPoint;
retCode: integer;
mR, mC: Word;
begin
RichEdit1.Enabled := True;
RichEdit1.SetFocus ;
RichEdit1.SelStart := 0;
if (FLastMousePos.X = 0) and (FLastMousePos.Y = 0) then
GetCursorPos(FLastMousePos);
FLastMousePos := RichEdit1.ScreenToClient(FLastMousePos);
retCode := SendMessage(RichEdit1.Handle, EM_CHARFROMPOS, 0, LPARAM(@FLastMousePos));
mR := HiWord(retCode);
mC := Loword(retCode);
cPos.X := mC ;
cPos.Y := mR ;
RichEdit1.CaretPos := cPos;
FLastMousePos.X := 0;
FLastMousePos.Y := 0;
end;
end.
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