unit Unit15;

interface

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

type
  TForm15 = class(TForm)
    RichEdit1: TRichEdit;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  protected
    procedure WndProc(var Message: TMessage); override;
  public
    { Public declarations }
  end;

var
  Form15: TForm15;

implementation

{$R *.dfm}

procedure TForm15.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;

procedure TForm15.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;

end.