如何在RichEdit控件里加入链接

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls;

type
  TForm1 = class(TForm)
    RichEdit1: TRichEdit;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    procedure WndProc(var Msg: TMessage); override;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses RichEdit, shellapi;

procedure InitRichEditURLDetection(RE: TRichEdit);
var
  mask: Word;
begin
  mask := SendMessage(RE.Handle, EM_GETEVENTMASK, 0, 0);
  SendMessage(RE.Handle, EM_SETEVENTMASK, 0, mask or ENM_LINK);
  SendMessage(RE.Handle, EM_AUTOURLDETECT, Integer(True), 0);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  cf2: CHARFORMAT2;
begin

  ZeroMemory(@cf2, sizeof(CHARFORMAT2));
  cf2.cbSize := sizeof(CHARFORMAT2);
  cf2.dwMask := CFM_LINK;
  cf2.dwEffects := CFE_LINK;
  RichEdit1.Perform(EM_SETCHARFORMAT, SCF_SELECTION, Integer(@cf2));
  RichEdit1.SelStart := length(RichEdit1.Text);

end;

procedure TForm1.FormCreate(Sender: TObject);
var
  s: string;
begin
  InitRichEditURLDetection(RichEdit1);
  s := '关于' + #13#10 + 'www.baidu.com' + #13#10 + '谢谢大家的支持';
  RichEdit1.Text := s;
end;

procedure TForm1.WndProc(var Msg: TMessage);
var
  p: TENLink;
  sURL: string;
  CE: TRichEdit;
begin
  if (Msg.Msg = WM_NOTIFY) then
  begin
    if (PNMHDR(Msg.lParam).code = EN_LINK) then
    begin
      p := TENLink(Pointer(TWMNotify(Msg).NMHdr)^);
      if (p.Msg = WM_LBUTTONDOWN) then
      begin
        try
          CE := TRichEdit(ActiveControl);
          SendMessage(CE.Handle, EM_EXSETSEL, 0, Longint(@(p.chrg)));
          showmessage(CE.SelText);
          sURL := CE.SelText;
          Caption := sURL;
          ShellExecute(Handle, 'open', PChar(sURL), nil, nil, SW_SHOWNORMAL);
        except
        end;
      end;
    end;
  end;
  inherited;
end;

end.