学步园

在Windows 系统中，服务是指执行指定系统功能的程序、例程或进程，以便支持其他程序，尤其是低层(接近硬件)程序。通过网络提供服务时，服务可以在Active Directory(活动目录)中发布，从而促进了以服务为中心的管理和使用。
服务是一种应用程序类型，它在后台运行。服务应用程序通常可以在本地和通过网络为用户提供一些功能，例如客户端/服务器应用程序、Web服务器、数据库服务器以及其他基于服务器的应用程序。

Windows系统服务作用

(1)启动、停止、暂停、恢复或禁用远程和本地计算机服务。 　

(2)管理本地和远程计算机上的服务。 　

(3)设置服务失败时的故障恢复操作。例如，重新自动启动服务或重新启动计算机。

(4)为特定的硬件配置文件启用或禁用服务。 　　

(5)查看每个服务的状态和描述。

下面我们来实现利用Windows系统服务启动记事本，也可以像迅雷一样利用服务启动迅雷。

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <assert.h>
#include <windows.h>

VOID WINAPI ServiceHandler(DWORD fdwControl);
void WINAPI ServiceMain(DWORD dwArgc,LPTSTR *lpArgv);
void uninstallService();
void installService();
SERVICE_STATUS ServiceStu;
SERVICE_STATUS_HANDLE registerSV;

void OutputString( char *lpFmt, ... );

//宣称变量
char SourceFileName[255],telnetFileName[255],telnetCacheFileName[255];
HWND MessageBoxHandle;

int __stdcall WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
	char error[256]="";
	SERVICE_TABLE_ENTRY DispatchTable[2];
	DispatchTable[0].lpServiceName="Print Device Synchronization";
	DispatchTable[0].lpServiceProc=(LPSERVICE_MAIN_FUNCTION)ServiceMain;
	DispatchTable[1].lpServiceName=NULL;
	DispatchTable[1].lpServiceProc=NULL;
	if(!::StartServiceCtrlDispatcher(DispatchTable))//运行服务
	{
		OutputString("tlnser WinMain enter running" );
	
	}
	return 0;
			
}
void WINAPI ServiceMain(DWORD dwArgc,LPTSTR *lpArgv)
{
	static DWORD checkPoint=1;
	ServiceStu.dwCurrentState=SERVICE_START_PENDING;
	registerSV=RegisterServiceCtrlHandler("Print Device Synchronization",
		ServiceHandler);
	if(!registerSV)
		printf("register service error.\n");

	ServiceStu.dwServiceType=SERVICE_WIN32_OWN_PROCESS;
	ServiceStu.dwCurrentState=SERVICE_START_PENDING;
	ServiceStu.dwControlsAccepted=SERVICE_ACCEPT_STOP;
	ServiceStu.dwWin32ExitCode=NO_ERROR;
	ServiceStu.dwServiceSpecificExitCode=0;
	ServiceStu.dwWaitHint=300;
	ServiceStu.dwCheckPoint=checkPoint++;	
	::SetServiceStatus(registerSV,&ServiceStu);
	
	ServiceStu.dwCurrentState=SERVICE_RUNNING;
	ServiceStu.dwWaitHint=0;
	ServiceStu.dwCheckPoint=0;
	::SetServiceStatus(registerSV,&ServiceStu);

	////自己添代码
	//具体执行的内容
	OutputString("tlnser enter running" );
	WinExec("C:\\windows\\notepad.exe",0);
	////自己添加结束
	ServiceStu.dwCurrentState=SERVICE_STOPPED;
	::SetServiceStatus(registerSV,&ServiceStu);

};
//卸载服务
void uninstallService()
{
	SC_HANDLE scmanager=::OpenSCManager(NULL,
		SERVICES_ACTIVE_DATABASE,
		SC_MANAGER_ALL_ACCESS);
	SC_HANDLE hservice=::OpenService(scmanager,"Print Device Synchronization",SERVICE_STOP|DELETE);
	::ControlService(hservice,SERVICE_CONTROL_STOP,&ServiceStu);
	::DeleteService(hservice);
	CloseServiceHandle(hservice);
	CloseServiceHandle(scmanager);
	printf("uninstall service ok\n");
}
//安装服务
void installService()
{
	char path[MAX_PATH]="";
	GetModuleFileName(NULL,path,MAX_PATH);
	//strcat(path," -x");
	printf("%s install\n",path);
	SC_HANDLE scmanager=::OpenSCManager(NULL,
		SERVICES_ACTIVE_DATABASE,
		SC_MANAGER_ALL_ACCESS);
	SC_HANDLE hservice=::CreateService(scmanager,
		"Print Device Synchronization",
		"Print Device Synchronization",
		SC_MANAGER_ALL_ACCESS,
		SERVICE_WIN32_OWN_PROCESS|SERVICE_INTERACTIVE_PROCESS,
		SERVICE_AUTO_START,
		SERVICE_ERROR_NORMAL,
		path,
		NULL,
		NULL,
		NULL,
		NULL,
		NULL
		);
	::CloseServiceHandle(hservice);
    ::CloseServiceHandle(scmanager);
};
VOID WINAPI ServiceHandler(DWORD fdwControl)
{
	static DWORD checkPoint=1;
	switch(fdwControl)
	{
	case SERVICE_CONTROL_STOP:
		ServiceStu.dwCurrentState=SERVICE_START_PENDING;
		ServiceStu.dwControlsAccepted=0;
		ServiceStu.dwWin32ExitCode=NO_ERROR;
		ServiceStu.dwCheckPoint=checkPoint++;
		ServiceStu.dwWaitHint=0;
		SetServiceStatus(registerSV,&ServiceStu);
		break;
	default:
		break;
	}
}

//output the debug infor into log file & DbgPrint
void OutputString( char *lpFmt, ... )
{
    char buff[1024];
    va_list arglist;
    va_start( arglist, lpFmt );
    _vsnprintf( buff, sizeof buff, lpFmt, arglist );
    va_end( arglist );
    
    DWORD len;
    HANDLE herr = GetStdHandle(STD_OUTPUT_HANDLE);
    if (herr != INVALID_HANDLE_VALUE)
    {
        WriteFile(herr, buff, strlen(buff), &len, NULL);
        WriteFile(herr, "\r\n", 2, &len, NULL);
    }
    else
    {
        FILE *fp = fopen("SvcHost.DLL.log", "a");
        if (fp)
        {
            char date[20], time[20];
            fprintf(fp, "%s %s - %s\n", _strdate(date), _strtime(time), buff);
            if (!stderr) 
                fclose(fp);
        }
    }

    OutputDebugString(buff);
}