TRichEdit 实现URL

Author: Mike Shkolnik

{....}

 protected

   procedure WndProc(var Message: TMessage); override;

   

{....}

uses Richedit, ShellApi;

{Today I want to show how to implement URL highlighting and URL navigation

without any third-party components. This functionality is implemented in

RichEdit from Microsoft (and MS Outlook use this feature, for example) and

only Borland's developers didn't publish it for us.}

procedure TForm1.FormCreate(Sender: TObject);

var

 mask: Word;

begin

 mask := SendMessage(RichEdit1.Handle, EM_GETEVENTMASK, 0, 0);

 SendMessage(RichEdit1.Handle, EM_SETEVENTMASK, 0, mask or ENM_LINK);

 SendMessage(RichEdit1.Handle, EM_AUTOURLDETECT, Integer(True), 0);

 //Some text in RichEdit

 RichEdit1.Text := 'Scalabium Software'#13#10 +

   ' Site is located at www.scalabium.com. Welcome to our site.';

end;

procedure TForm1.WndProc(var Message: TMessage);

var

 p: TENLink;

 strURL: string;

begin

 if (Message.Msg = WM_NOTIFY) then

 begin

   if (PNMHDR(Message.lParam).code = EN_LINK) then

   begin

     p := TENLink(Pointer(TWMNotify(Message).NMHdr)^);

     if (p.Msg = WM_LBUTTONDOWN) then

     begin

       SendMessage(RichEdit1.Handle, EM_EXSETSEL, 0, Longint(@(p.chrg)));

       strURL := RichEdit1.SelText;

       ShellExecute(Handle, 'open', PChar(strURL), 0, 0, SW_SHOWNORMAL);

     end

   end

 end;

 inherited;

end;