C语言编写的Windows服务程序，可以类比Linux/Unix环境下的daemon进程。

一下是VS2010环境下的demo：

// windows_service.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include

#include

#define SLEEP_TIME 5000 /*间隔时间*/

#define LOGFILE "D:\\log.txt" /*信息输出文件*/

SERVICE_STATUS ServiceStatus; /*服务状态*/

SERVICE_STATUS_HANDLE hStatus; /*服务状态句柄*/

void ServiceMain(int argc, char** argv);

void CtrlHandler(DWORD request);

int InitService();

int _tmain(int argc, _TCHAR* argv[])

{

SERVICE_TABLE_ENTRY ServiceTable[2];

ServiceTable[0].lpServiceName="Monitor";

ServiceTable[0].lpServiceProc=(LPSERVICE_MAIN_FUNCTION)ServiceMain;

ServiceTable[1].lpServiceName=NULL;

ServiceTable[1].lpServiceProc=NULL;

StartServiceCtrlDispatcher(ServiceTable);

return 0;

}

int WriteToLog(char* str)

{

FILE* pfile;

fopen_s(&pfile,LOGFILE,"a+");

if (pfile==NULL)

{

return -1;

}

fprintf_s(pfile,"%s\n",str);

fclose(pfile);

return 0;

}

/*Service initialization*/

int InitService()

{

OutputDebugString("Monitoring started.");

int result;

result = WriteToLog("Monitoring started.");

return(result);

}

/*Control Handler*/

void CtrlHandler(DWORD request)

{

switch (request)

{

case SERVICE_CONTROL_STOP:

OutputDebugString("Monitoring stopped.");

WriteToLog("Monitoring stopped.");

ServiceStatus.dwWin32ExitCode = 0;

ServiceStatus.dwCurrentState = SERVICE_STOPPED;

SetServiceStatus (hStatus, &ServiceStatus);

return;

case SERVICE_CONTROL_SHUTDOWN:

OutputDebugString("Monitoring stopped.");

WriteToLog("Monitoring stopped.");

ServiceStatus.dwWin32ExitCode = 0;

ServiceStatus.dwCurrentState = SERVICE_STOPPED;

SetServiceStatus (hStatus, &ServiceStatus);

return;

default:

break;

}

/* Report current status */

SetServiceStatus (hStatus, &ServiceStatus);

return;

}

void ServiceMain(int argc, char** argv)

{

int error;

ServiceStatus.dwServiceType =

SERVICE_WIN32;

ServiceStatus.dwCurrentState =

SERVICE_START_PENDING;

/*在本例中只接受系统关机和停止服务两种控制命令*/

ServiceStatus.dwControlsAccepted =

SERVICE_ACCEPT_SHUTDOWN |

SERVICE_ACCEPT_STOP;

ServiceStatus.dwWin32ExitCode = 0;

ServiceStatus.dwServiceSpecificExitCode = 0;

ServiceStatus.dwCheckPoint = 0;

ServiceStatus.dwWaitHint = 0;

hStatus = ::RegisterServiceCtrlHandler(

"Monitor",

(LPHANDLER_FUNCTION)CtrlHandler);

if (hStatus == (SERVICE_STATUS_HANDLE)0)

{

WriteToLog("RegisterServiceCtrlHandler failed");

return;

}

WriteToLog("RegisterServiceCtrlHandler success");

/* Initialize Service */

error = InitService();

if (error)

{

/* Initialization failed */

ServiceStatus.dwCurrentState =

SERVICE_STOPPED;

ServiceStatus.dwWin32ExitCode = -1;

SetServiceStatus(hStatus, &ServiceStatus);

return;

}

/*向SCM 报告运行状态*/

ServiceStatus.dwCurrentState =

SERVICE_RUNNING;

SetServiceStatus (hStatus, &ServiceStatus);

/*do something you want to do in this while loop*/

MEMORYSTATUS memstatus;

while (ServiceStatus.dwCurrentState ==

SERVICE_RUNNING)

{

char buffer[16];

GlobalMemoryStatus(&memstatus);

int availmb = memstatus.dwAvailPhys/1024/1024;

sprintf_s(buffer,100,"available memory is %dMB",availmb);

OutputDebugString(buffer);

int result = WriteToLog(buffer);

if (result)

{

ServiceStatus.dwCurrentState =

SERVICE_STOPPED;

ServiceStatus.dwWin32ExitCode = -1;

SetServiceStatus(hStatus,

&ServiceStatus);

return;

}

Sleep(SLEEP_TIME);

}

WriteToLog("service stopped");

return;

}注册&启动服务的bat脚本：

sc create Monitor binpath= D:\test\windows_service.exe

sc start Monitor请注意binpath= 后面的空格符，空格符缺失则无法创建服务。

停止和删除服务的命令如下：

sc stop Monitor

sc delete Monitor

作者：super_bert@csdn