Code:

{

So what we need:

1. drop on your form a RichEdit component from win32 page of component

palette

2. in OnCreate event of your form write the next code:

}

procedure TForm1.FormCreate(Sender: TObject);

var

  mask: Word;

begin

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

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

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

  RichEdit1.Text := 'SwissDelphiCenter.com: '#13#10 +

    ' Site is located at www.SwissDelphiCenter.com';

end;

{

After that your Richedit will convert automatically any URLs in highlighted

(blue color and underlined). Even if you'll start to enter any text directly

in Richedit, any begings for URL will be converted too (not only existing

text string but new too)

}

// 3. now we must detect mouse clicks in URL range. For this task we must

//    override WndProc method of our form:

type

  TForm1 = class(TForm)

  protected

    procedure WndProc(var Message: TMessage); override;

  end;

// 4. the implementation looks like this:

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;

{

5. Now you can compile your project (don't forget to include Richedit and

ShellAPI units in uses clause).

}