delphi创建具有托盘的服务程序（service）

????File-->New-->Form为服务添加窗口FrmMain,单元保存为Unit_FrmMain,并且把这个窗口设置为手工创建.完成后的代码如下:

unit Unit_Main;

interface

uses
Windows,Messages,SysUtils,Classes,Graphics,Controls,SvcMgr,Dialogs,Unit_FrmMain;

type
TDelphiService = class(TService)
procedure ServiceContinue(Sender: TService; var Continued: Boolean);
procedure ServiceExecute(Sender: TService);
procedure ServicePause(Sender: TService; var Paused: Boolean);
procedure ServiceShutdown(Sender: TService);
procedure ServiceStart(Sender: TService; var Started: Boolean);
procedure ServiceStop(Sender: TService; var Stopped: Boolean);
private
{ Private declarations }
public
function GetServiceController: TServiceController; override;
{ Public declarations }
end;

var
DelphiService: TDelphiService;
FrmMain: TFrmMain;
implementation

{$R *.DFM}

procedure ServiceController(CtrlCode: DWord); stdcall;
begin
  DelphiService.Controller(CtrlCode);
end;

function TDelphiService.GetServiceController: TServiceController;
begin
  Result := ServiceController;
end;

procedure TDelphiService.ServiceContinue(Sender: TService;
var Continued: Boolean);
begin
  while not Terminated do
  begin
    Sleep(10);
    ServiceThread.ProcessRequests(False);
  end;
end;

procedure TDelphiService.ServiceExecute(Sender: TService);
begin
  while not Terminated do
  begin
    Sleep(10);
    ServiceThread.ProcessRequests(False);
  end;
end;

procedure TDelphiService.ServicePause(Sender: TService;
var Paused: Boolean);
begin
  Paused := True;
end;

procedure TDelphiService.ServiceShutdown(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.

unit Unit_FrmMain;

interface

uses
Windows,Variants,ShellApi,Forms,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; {窗口最前}
  SetWindowLong(Application.Handle,GWL_EXSTYLE,WS_EX_TOOLWINDOW); {不在任务栏显示}
  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',False,DESKTOP_JOURNALPLAYBACK);
  if (HDesk_WL <> 0) then
  if (SetThreadDesktop (HDesk_WL) = True) then
  PostMessage(HWND_BROADCAST,WM_HOTKEY,MAKELONG (MOD_ALT or MOD_CONTROL,VK_DELETE));
end;

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

end.

program ServiceDemo;

uses
SvcMgr,Unit_Main in 'Unit_Main.pas' {DelphiService: TService},Unit_frmMain in 'Unit_frmMain.pas' {frmMain};

{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TDelphiService,DelphiService);
  Application.Run;
end.

object DelphiService: TDelphiService
OldCreateOrder = False
DisplayName = 'Delphi服务演示程序'
Interactive = True
OnContinue = ServiceContinue
OnExecute = ServiceExecute
OnPause = ServicePause
OnShutdown = ServiceShutdown
OnStart = ServiceStart
OnStop = ServiceStop
Left = 261
Top = 177
Height = 150
Width = 215
end

object frmMain: TfrmMain
Left = 192
Top = 107
Width = 696
Height = 480
Caption = '我的服务测试程序'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
OldCreateOrder = False
OnCloseQuery = FormCloseQuery
OnCreate = FormCreate
OnDestroy = FormDestroy
PixelsPerInch = 96
TextHeight = 13
object Button1: TButton
Left = 296
Top = 264
Width = 75
Height = 25
Caption = 'Button1'
TabOrder = 0
OnClick = Button1Click
end
object Timer1: TTimer
OnTimer = Timer1Timer
Left = 120
Top = 192
end
end 

如何加入自己服务程序的“描述”内容呢？

目前基本有两种方法：
1、修改注册表，在
HKEY_LOCAL_MACHINESYSTEMCurrentControlSet001Services下找到自己的服务名称键值，然后加入一个名为Description的字符串字段，字段内容就是描述的内容。
这种方法通过实验是有效的，但因为不是通过API实现，而是直接写注册表，不太清楚适用性如何，不同的系统不知是否通用。

2、可通过ChangeServiceConfig2函数实现对服务的描述的修改。网上的ChangeServiceConfig2函数举例都根本无法成功运行，通过摸索改进，现提供ChangeServiceConfig2的正确用法如下，可成功有效地修改服务程序的描述。