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用Delphi编写一个Svchost.exe调用的DLL模块

作者:admin 来源:未知 日期:2011/4/11 21:25:14 人气: 标签:

这个模块的代码在网上流传的是用C写的,这里是用Delphi写了一个DLL,可以自己扩充各种功能.
用svchost.exe服务来启动DLL.


{ 文件名: ServiceDll.dpr 概述: 替换由svchost.exe启动的某个系统服务,具体服务由全局变量 ServiceName 决定. 经测试,生成的DLL文件运行完全正常. 测试环境: Windows 2003 Server + Delphi 7.0 代码只实现了一个框架,没有任何实际动作,仅作为学习用.如果你使用本代码 进行了任何扩充和修改,希望您能将代码寄一份给我. }
library ServiceDll; uses SysUtils, Classes, winsvc, System, Windows; { 定义全局变量 }var // 服务控制信息句柄 SvcStatsHandle: SERVICE_STATUS_HANDLE; // 存储服务状态 dwCurrState: DWORD; // 服务名称 ServiceName: PChar = 'BITS'; { 调试函数,用于输出调试文本 } procedure OutPutText(CH: PChar);var FileHandle: TextFile; F: Integer;begin try    if not FileExists('zztestdll.txt') then F := FileCreate('zztestdll.txt'); finally    if F > 0 then FileClose(F);    end;    AssignFile(FileHandle, 'zztestdll.txt'); Append(FileHandle); Writeln(FileHandle, CH); Flush(FileHandle); CloseFile(FileHandle);end;    { dll入口和出口处理函数 } procedure DLLEntryPoint(dwReason: DWord);begin   case dwReason of    DLL_PROCESS_ATTACH: ;    DLL_PROCESS_DETACH: ;    DLL_THREAD_ATTACH: ;    DLL_THREAD_DETACH: ;    end;end; { 与SCM管理器通话 } function TellSCM(dwState: DWORD; dwExitCode: DWORD; dwProgress: DWORD): LongBool;var srvStatus: service_status;begin srvStatus.dwServiceType := SERVICE_WIN32_SHARE_PROCESS; dwCurrState := dwState; srvStatus.dwCurrentState := dwState; srvStatus.dwControlsAccepted := SERVICE_ACCEPT_STOP or SERVICE_ACCEPT_PAUSE_CONTINUE or SERVICE_ACCEPT_SHUTDOWN; srvStatus.dwWin32ExitCode := dwExitCode; srvStatus.dwServiceSpecificExitCode := 0; srvStatus.dwCheckPoint := dwProgress; srvStatus.dwWaitHint := 3000; Result := SetServiceStatus(SvcStatsHandle, srvStatus);end; { Service 控制函数 } procedure servicehandler(fdwcontrol: integer); stdcall;BEGIN   case fdwcontrol OF      SERVICE_CONTROL_STOP:begin    TellSCM(SERVICE_STOP_PENDING, 0, 1);    Sleep(10);    TellSCM(SERVICE_STOPPED, 0, 0);    end;    SERVICE_CONTROL_PAUSE:begin    TellSCM(SERVICE_PAUSE_PENDING, 0, 1);    TellSCM(SERVICE_PAUSED, 0, 0);    end;    SERVICE_CONTROL_CONTINUE:begin    TellSCM(SERVICE_CONTINUE_PENDING, 0, 1);    TellSCM(SERVICE_RUNNING, 0, 0);    end;    SERVICE_CONTROL_INTERROGATE:TellSCM(dwCurrState, 0, 0);    SERVICE_CONTROL_SHUTDOWN:TellSCM(SERVICE_STOPPED, 0, 0);   end;   end; { service main } procedure ServiceMain(argc: Integer; var argv: pchar); stdcall;begin { try begin if ParamStr(1) <> '' then svcname := strNew(PChar(ParamStr(1))) else begin svcname := strAlloc(10 * Sizeof(Char)); svcname := 'none'; end; OutPutText(svcname); end finally strdispose(svcname); end; } // 注册控制函数 SvcStatsHandle := RegisterServiceCtrlHandler(ServiceName, @servicehandler); if (SvcStatsHandle = 0) then    begin    OutPutText('Error in RegisterServiceCtrlHandler');    exit;    end    else    begin    FreeConsole();    end; // 启动服务 TellSCM(SERVICE_START_PENDING, 0, 1); TellSCM(SERVICE_RUNNING, 0, 0); OutPutText('Service is Running'); // 这里可以执行我们真正要作的代码 while ((dwCurrState <> SERVICE_STOP_PENDING) and (dwCurrState <> SERVICE_STOPPED)) do    begin    sleep(1000);    end;    OutPutText('Service Exit');   end;    // 导出函数列表exports ServiceMain; { dll入口点 }begin DllProc := @DLLEntryPoint;end.

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