RegisterServiceProcess
106. 编写后台监控软件，注册全局热键
http://www.jxit.com.cn/devecom/coolbaby/article/list.asp?id=60
后台监控软件，为了达到隐蔽监控的目的，应该满足正常运行时，不显示在任务栏上，在按Ctrl+Alt+Del出现的任务列表中也不显示，管理员可以通过热键调出隐藏的运行界面。要作到这些，必须把当前进程变为一个系统服务，并且定义全局热键。
一、把当前进程变为一个系统服务:
目的是在任务列表中把程序隐藏起来。调用API函数RegisterServiceProcess实现。
二、定义全局热键（本例中定义热键Ctrl+Del+R），步骤：
1、定义捕获Windows消息WM_HOTKEY的钩子函数，即：
procedure WMHotKey(var Msg : TWMHotKey); message WM_HOTKEY;
2、向Windows加入一个全局原子 Myhotkey: GlobalAddAtom('MyHotkey'),
并保留其句柄。
3、向Windows登记热键：调用API函数RegisterHotKey实现。
三、设计界面和源程序：
unit Unit1;
interface
uses
Windows, Messages, Forms, Dialogs, Classes, Controls, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
private
{热键标识ID}
id: Integer;
procedure WMHotKey(var Msg : TWMHotKey); message WM_HOTKEY;
{ Privat-Declarations}
public
{ Public-Declarations}
end;
var
Form1 : TForm1;
implementation
const RSP_SIMPLE_SERVICE=1;
function RegisterServiceProcess (dwProcessID, dwType: DWord) : DWord; stdcall; external 'KERNEL32.DLL';
{$R *.DFM}
{捕获热键消息}
procedure TForm1.WMHotKey (var Msg : TWMHotKey);
begin
if msg.HotKey = id then
ShowMessage('Ctrl+Alt+R键被按下!');
form1.Visible :=true;
end;
procedure TForm1.FormCreate(Sender: TObject);
Const {ALT、CTRL和R键的虚拟键值}
MOD_ALT = 1;
MOD_CONTROL = 2;
VK_R = 82;
begin
{首先判断程序是否已经运行}
if GlobalFindAtom('MyHotkey') = 0 then
begin
{注册全局热键Ctrl + Alt + R}
id:=GlobalAddAtom('MyHotkey');
RegisterHotKey(handle,id,MOD_CONTROL+MOD_Alt,VK_R);
end
else halt;
end;
{把当前进程变为一个系统服务，从而在任务列表中把程序隐藏起来}
procedure TForm1.Button1Click(Sender: TObject);
begin
RegisterServiceProcess(GetCurrentProcessID,RSP_SIMPLE_SERVICE);
form1.Hide;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
close;
end;
{退出时释放全局热键}
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
UnRegisterHotKey(handle,id);
GlobalDeleteAtom(id);
end;
end.
四、说明：在后台监控软件中使用以上功能，可真正实现隐蔽运行，热键调出，便于管理员进行管理。程序在Win98，Delphi5.0中运行通过。
以下是注册F9、F10两个全局热键的情况：
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
procedure WMHotKey(var Msg : TWMHotKey); message WM_HOTKEY;
end;
var
Form1: TForm1;
F9_ID,F10_ID:integer;
implementation
{$R *.DFM}
procedure TForm1.FormCreate(Sender: TObject);
begin
if GlobalFindAtom('MyF9HotKey') = 0 then
begin
F9_ID:=GlobalAddAtom('MyF9HotKey');
RegisterHotKey(handle,F9_id,0,VK_F9);
end;
if GlobalFindAtom('MyF10HotKey') = 0 then
begin
F10_ID:=GlobalAddAtom('MyF10HotKey');
RegisterHotKey(handle,F10_id,0,VK_F10);
end ;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
UnRegisterHotKey(handle,F9_id);
GlobalDeleteAtom(F9_id);
UnRegisterHotKey(handle,F10_id);
GlobalDeleteAtom(F10_id);
end;
procedure TForm1.WMHotKey(var Msg: TWMHotKey);
begin
if msg.HotKey = F9_id then form1.hide;
if msg.HotKey = F10_id then form1.show;
end;
end.
