#include <Windows.h>#include <stdio.h>#define SLEEP_TIME 5000                          // 间隔时间#define LOGFILE "C:\\memstatus.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 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 initializationint InitService() { 	OutputDebugString("Monitoring started.");	int result;	result = WriteToLog("Monitoring started.");	return(result); }// Control Handlervoid  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;	ServiceStatus.dwControlsAccepted = 		SERVICE_ACCEPT_SHUTDOWN | 		SERVICE_ACCEPT_STOP;//在本例中只接受系统关机和停止服务两种控制命令	ServiceStatus.dwWin32ExitCode = 0;	ServiceStatus.dwServiceSpecificExitCode = 0;	ServiceStatus.dwCheckPoint = 0;	ServiceStatus.dwWaitHint = 0;	hStatus = ::RegisterServiceCtrlHandler(		"MemoryStatus", 		(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);		// 下面就开始任务循环了，你可以添加你自己希望服务做的工作	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");}void main(){	SERVICE_TABLE_ENTRY ServiceTable[2];	ServiceTable[0].lpServiceName="MemoryStatus";	ServiceTable[0].lpServiceProc=(LPSERVICE_MAIN_FUNCTION)ServiceMain;	ServiceTable[1].lpServiceName=NULL;	ServiceTable[1].lpServiceProc=NULL;	StartServiceCtrlDispatcher(ServiceTable);}

命令行操作：

注意我这里在sc create MemortyStatus binpath= D:\MemoryStatus.exe里面有个拼写错误，MemoryStatus写成了MemortyStatus，多了个t,这个没关系，只要你在下面操作时候将错就错就行了。

运行结果：

最后，停止和删除服务：

参考：

http://www.vckbase.com/index.php/wv/1193

http://www.2cto.com/kf/201111/111990.html

C语言编写Windows服务程序