n(Sender: TService);
begin
gbCanClose := true;
FrmMain.Free;
Status := csStopped;
ReportStatus();
end;

procedure TDelphiService.ServiceStart(Sender: TService;
var Started: Boolean);
begin
Started := True;
Svcmgr.Application.CreateForm(TFrmMain, FrmMain);
gbCanClose := False;
FrmMain.Hide;
end;

procedure TDelphiService.ServiceStop(Sender: TService;
var Stopped: Boolean);
begin
Stopped := True;
gbCanClose := True;
FrmMain.Free;
end;

end.


主窗口单元如下:

unit Unit_FrmMain;

interface

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

const
WM_TrayIcon = WM_USER + 1234;
type
TFrmMain = class(TForm)
Timer1: TTimer;
Button1: TButton;
procedure FormCreate(Sender: TObject);
procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
procedure FormDestroy(Sender: TObject);
procedure Timer1Timer(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
IconData: TNotifyIconData;
procedure AddIconToTray;
procedure DelIconFromTray;
procedure TrayIconMessage(var Msg: TMessage); message WM_TrayIcon;
procedure SysButtonMsg(var Msg: TMessage); message WM_SYSCOMMAND;
public
{ Public declarations }
end;

var
FrmMain: TFrmMain;
gbCanClose: Boolean;
implementation

{$R *.dfm}

procedure TFrmMain.FormCreate(Sender: TObject);
begin
FormStyle := fsStayOnTop;
SetWindowLong(Application.Handle, GWL_EXSTYLE, WS_EX_TOOLWINDOW);
gbCanClose := False;
Timer1.Interval := 1000;
Timer1.Enabled := True;
end;

procedure TFrmMain.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
CanClose := gbCanClose;
if not CanClose then
begin
Hide;
end;
end;

procedure TFrmMain.FormDestroy(Sender: TObject);
begin
Timer1.Enabled := False;
DelIconFromTray;
end;

procedure TFrmMain.AddIconToTray;
begin
ZeroMemory(@IconData, SizeOf(TNotifyIconData));
IconData.cbSize := SizeOf(TNotifyIconData);
IconData.Wnd := Handle;
IconData.uID := 1;
IconData.uFlags := NIF_MESSAGE or NIF_ICON or NIF_TIP;
IconData.uCallbackMessage := WM_TrayIcon;
IconData.hIcon := Application.Icon.Handle;
IconData.szTip := Delphi服务演示程序;
Shell_NotifyIcon(NIM_ADD, @IconData);
end;

procedure TFrmMain.DelIconFromTray;
begin
Shell_NotifyIcon(NIM_DELETE, @IconData);
end;

procedure TFrmMain.SysButtonMsg(var Msg: TMessage);
begin
if (Msg.wParam = SC_CLOSE) or
(Msg.wParam = SC_MINIMIZE) then Hide
else inherited; // 执行默认动作
end;

procedure TFrmMain.TrayIconMessage(var Msg: TMessage);
begin
if (Msg.LParam = WM_LBUTTONDBLCLK) then Show();
end;

procedure TFrmMain.Timer1Timer(Sender: TObject);
begin
AddIconToTray;
end;

procedure SendHokKey;stdcall;
var
HDesk_WL: HDESK;
begin
HDesk_WL := OpenDesktop (Winlogon, 0, False, DESKTOP_JOURNALPLAYBACK);
if (HDesk_WL <> 0) then
if (SetThreadDesktop (HDesk_WL) = True) then
PostMessage(HWND_BROADCAST, WM_HOTKEY, 0, MAKELONG (MOD_ALT or MOD_CONTROL, VK_DELETE));
end;

procedure TFrmMain.Button1Click(Sender: TObject);
var
dwThreadID : DWORD;
begin
CreateThread(nil