Starting a Service

To start a service, the following example opens a handle to an installed database and then specifies the handle in a call to the StartService function. It can be used to start either a service or a driver service, but this example assumes that a service is being started. After starting the service, the program uses the members of the SERVICE_STATUS structure returned by the QueryServiceStatus function to track the progress of the service.

VOID StartSampleService()

{

SERVICE_STATUS ssStatus;

DWORD dwOldCheckPoint;

schService = OpenService(

schSCManager, // SCM database

TEXT("Sample_Srv"), // service name

SERVICE_ALL_ACCESS);

if (schService == NULL)

MyErrorExit("OpenService");

if (!StartService(

schService, // handle to service

0, // number of arguments

NULL) ) // no arguments

{

MyErrorExit("StartService");

}

else

printf("Service start pending\n");

// Check the status until the service is running.

if (!QueryServiceStatus(

schService, // handle to service

&ssStatus) ) // address of status information

MyErrorExit("QueryServiceStatus");

while (ssStatus.dwCurrentState != SERVICE_RUNNING)

{

// Save the current checkpoint.

dwOldCheckPoint = ssStatus.dwCheckPoint;

// Wait for the specified interval.

Sleep(ssStatus.dwWaitHint);

// Check the status again.

if (!QueryServiceStatus(

schService, // handle to service

&ssStatus) ) // address of status information

break;

// Break if the checkpoint has not been incremented.

if (dwOldCheckPoint >= ssStatus.dwCheckPoint)

break;

}

if (ssStatus.dwCurrentState == SERVICE_RUNNING)

printf("StartService SUCCESS\n");

else

{

printf("\nService not started: \n");

printf(" Current State: %d\n",

ssStatus.dwCurrentState);

printf(" Exit Code: %d\n", ssStatus.dwWin32ExitCode);

printf(" Service Specific Exit Code: %d\n",

ssStatus.dwServiceSpecificExitCode);

printf(" Check Point: %d\n", ssStatus.dwCheckPoint);

printf(" Wait Hint: %d\n", ssStatus.dwWaitHint);

}

CloseServiceHandle(schService);

}

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