Writing a ServiceMain function (using RegisterServiceCtrlHandler functions)

The following global definitions is used in this sample.

C++

#define Svcname TEXT ("Svcname") service_status          gsvcstatus; Service_status_handle   Gsvcstatushandle; HANDLE                  ghsvcstopevent = NULL;

The following sample fragment is taken by the complete service sample.

C++

Purpose://Entry point for the service////parameters://dwargc-number of arguments in the LPSZARGV array// Lpszargv-array of strings. The first string is the name of//the service and subsequent strings be passed by the process//that called the S Tartservice function to start the service.////Return value://none.//void WINAPI svcmain (DWORD dwargc, LPTSTR *lpszar GV) {//Register the handler function for the service Gsvcstatushandle = RegisterServiceCtrlHandler (Svcnam    E, Svcctrlhandler);         if (!gsvcstatushandle) {svcreportevent (TEXT ("RegisterServiceCtrlHandler"));     Return     }//These service_status members remain as set here Gsvcstatus.dwservicetype = service_win32_own_process;        Gsvcstatus.dwservicespecificexitcode = 0;    Report initial status to the SCM reportsvcstatus (service_start_pending, No_error, 3000);    Perform service-specific initialization and work. Svcinit (DWARGC, LPsZARGV);} Purpose://The service code////parameters://dwargc-number of arguments in the lpszargv array//lpszargv- Array of strings. The first string is the name of//the service and subsequent strings be passed by the process//that called the S    Tartservice function to start the service.////Return value://none//void svcinit (DWORD dwargc, LPTSTR *lpszargv) {    To_do:declare and set any required variables. Be sure to periodically call Reportsvcstatus () with//service_start_pending.    If initialization fails, call//Reportsvcstatus with service_stopped. Create an event.    The control handler function, Svcctrlhandler,//signals this event when it receives the stop control code. Ghsvcstopevent = CreateEvent (NULL,//default security attributes TRUE   ,//Manual reset event FALSE,//not signaled NULL); No Name if (GHSvcstopevent = = NULL) {reportsvcstatus (service_stopped, no_error, 0);    Return    }//Report running status when initialization are complete.    Reportsvcstatus (service_running, no_error, 0);    To_do:perform work until service stops.        while (1) {//Check whether to stop the service.        WaitForSingleObject (Ghsvcstopevent, INFINITE);        Reportsvcstatus (service_stopped, no_error, 0);    Return }}////Purpose://sets the current service status and reports it to the scm.////parameters://dwcurrentstate-the C Urrent state (see Service_status)//dwwin32exitcode-the system error code//dwwaithint-estimated time for pending                      operation,//in milliseconds////Return value://none//void reportsvcstatus (DWORD dwcurrentstate,    DWORD Dwwin32exitcode, DWORD dwwaithint) {static DWORD dwcheckpoint = 1;    Fill in the service_status structure. Gsvcstatus.dwcurrentstate = theUrrentstate;    Gsvcstatus.dwwin32exitcode = Dwwin32exitcode;    Gsvcstatus.dwwaithint = Dwwaithint;    if (dwcurrentstate = = service_start_pending) gsvcstatus.dwcontrolsaccepted = 0;    else gsvcstatus.dwcontrolsaccepted = service_accept_stop;           if ((dwcurrentstate = = service_running) | |        (dwcurrentstate = = service_stopped))    Gsvcstatus.dwcheckpoint = 0;    else Gsvcstatus.dwcheckpoint = dwcheckpoint++;    The status of the service to the SCM. SetServiceStatus (Gsvcstatushandle, &gsvcstatus);}

In the following example, the Svcctrlhandler function is a example of a Handler function. Note that the ghsvcstopevent variable are a global variable that should being initialized and used as demonstrated in Writing A ServiceMain function.

C++

Purpose://   called by SCM whenever a control code was sent to the service//   using the ControlService function. parameters://   Dwctrl-control code////Return value://   none//void WINAPI svcctrlhandler (DWORD Dwctrl) {
   //Handle the requested control code.    Switch (Dwctrl)    {case        service_control_stop:          reportsvcstatus (service_stop_pending, no_error, 0);         Signal the service to stop.         SetEvent (ghsvcstopevent);         Reportsvcstatus (gsvcstatus.dwcurrentstate, no_error, 0);                  return;       Case service_control_interrogate: Break          ;        Default: Break          ;   }    }

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Writing a ServiceMain function (using RegisterServiceCtrlHandler functions)