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);
}