用 C 语言编写 Windows 服务程序

//  NTService.cpp : Defines the entry point for the console application.
//

#include  < windows.h >
#include  < stdio.h >

#define  SLEEP_TIME 5000
#define  LOGFILE "C:/MyServices/memstatus.txt"


SERVICE_STATUS ServiceStatus; 
SERVICE_STATUS_HANDLE hStatus; 

void  ServiceMain( int  argc,  char **  argv); 
void  ControlHandler(DWORD request); 
int  InitService();
int  WriteToLog( char *  str);


int  main( int  argc,  char *  argv[])
{
    SERVICE_TABLE_ENTRY ServiceTable[ 2 ];
    ServiceTable[ 0 ].lpServiceName  =   " MemoryStatus " ;
    ServiceTable[ 0 ].lpServiceProc  =  (LPSERVICE_MAIN_FUNCTION)ServiceMain;
    
    ServiceTable[ 1 ].lpServiceName  =  NULL;
    ServiceTable[ 1 ].lpServiceProc  =  NULL;

     //  启动服务的控制分派机线程
    StartServiceCtrlDispatcher(ServiceTable); 
}




void  ServiceMain( int  argc,  char **  argv) 
{ 
    int  error; 
 
   ServiceStatus.dwServiceType  =  
      SERVICE_WIN32; 
   ServiceStatus.dwCurrentState  =  
      SERVICE_START_PENDING; 
   ServiceStatus.dwControlsAccepted    =   
      SERVICE_ACCEPT_STOP  |  
      SERVICE_ACCEPT_SHUTDOWN;
   ServiceStatus.dwWin32ExitCode  =   0 ; 
   ServiceStatus.dwServiceSpecificExitCode  =   0 ; 
   ServiceStatus.dwCheckPoint  =   0 ; 
   ServiceStatus.dwWaitHint  =   0 ; 
 
   hStatus  =  RegisterServiceCtrlHandler(
       " MemoryStatus " , 
      (LPHANDLER_FUNCTION)ControlHandler); 
    if  (hStatus  ==  (SERVICE_STATUS_HANDLE) 0 ) 
   { 
       //  Registering Control Handler failed
       return ; 
   }  
    //  Initialize Service 
   error  =  InitService(); 
    if  ( ! error) 
   {
       //  Initialization failed
      ServiceStatus.dwCurrentState  =  
         SERVICE_STOPPED; 
      ServiceStatus.dwWin32ExitCode  =   - 1 ; 
      SetServiceStatus(hStatus,  & ServiceStatus); 
       return ; 
   } 
    //  We report the running status to SCM. 
   ServiceStatus.dwCurrentState  =  
      SERVICE_RUNNING; 
   SetServiceStatus (hStatus,  & ServiceStatus);
 
   MEMORYSTATUS memory;
    //  The worker loop of a service
    while  (ServiceStatus.dwCurrentState  ==  
          SERVICE_RUNNING)
   {
       char  buffer[ 16 ];
      GlobalMemoryStatus( & memory);
      sprintf(buffer,  " %d " , memory.dwAvailPhys);
       int  result  =  WriteToLog(buffer);
       if  (result)
      {
         ServiceStatus.dwCurrentState  =  
            SERVICE_STOPPED; 
         ServiceStatus.dwWin32ExitCode       =   - 1 ; 
         SetServiceStatus(hStatus, 
                           & ServiceStatus);
          return ;
      }
      Sleep(SLEEP_TIME);
   }
    return ; 
}



void  ControlHandler(DWORD request) 
{ 
    switch (request) 
   { 
       case  SERVICE_CONTROL_STOP: 
         WriteToLog( " Monitoring stopped. " );

         ServiceStatus.dwWin32ExitCode  =   0 ; 
         ServiceStatus.dwCurrentState  =  SERVICE_STOPPED; 
         SetServiceStatus (hStatus,  & ServiceStatus);
          return ; 
 
       case  SERVICE_CONTROL_SHUTDOWN: 
         WriteToLog( " Monitoring stopped. " );

         ServiceStatus.dwWin32ExitCode  =   0 ; 
         ServiceStatus.dwCurrentState  =  SERVICE_STOPPED; 
         SetServiceStatus (hStatus,  & ServiceStatus);
          return ; 
        
       default :
          break ;
    } 
 
     //  Report current status
    SetServiceStatus (hStatus,  & ServiceStatus);
 
     return ; 
}


int  WriteToLog( char *  str)
{
    FILE *  log;
    log  =  fopen(LOGFILE,  " a+ " );
     if  (log  ==  NULL)
     return   - 1 ;
    fprintf(log,  " %s " , str);
    fclose(log);
     return   0 ;
}

int  InitService(){
    WriteToLog( " Monitoring started. " );
     return   true ;
}