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The following example uses the ControlService function to send a control value to a running service. Different control values require different levels of access to the service object. For example, a service object handle must have SERVICE_STOP access to send the SERVICE_CONTROL_STOP control code. When ControlService returns, a SERVICE_STATUS structure contains the latest status information for the service.
VOID ControlSampleService(DWORD fdwControl)
{
SERVICE_STATUS ssStatus;
DWORD fdwAccess;
DWORD dwStartTickCount, dwWaitTime;
// The required service object access depends on the control.
switch (fdwControl)
{
case SERVICE_CONTROL_STOP:
fdwAccess = SERVICE_STOP;
break;
case SERVICE_CONTROL_PAUSE:
case SERVICE_CONTROL_CONTINUE:
fdwAccess = SERVICE_PAUSE_CONTINUE;
break;
case SERVICE_CONTROL_INTERROGATE:
fdwAccess = SERVICE_INTERROGATE;
break;
default:
fdwAccess = SERVICE_INTERROGATE;
}
// Open a handle to the service.
schService = OpenService(
schSCManager, // SCManager database
"Sample_Srv", // name of service
fdwAccess); // specify access
if (schService == NULL)
MyErrorExit("OpenService");
// Send a control value to the service.
if (! ControlService(
schService, // handle to service
fdwControl, // control value to send
&ssStatus) ) // address of status info
{
MyErrorExit("ControlService");
}
// Print the service status.
printf("\nStatus of Sample_Srv: \n");
printf(" Service Type: 0x%x\n", ssStatus.dwServiceType);
printf(" Current State: 0x%x\n", ssStatus.dwCurrentState);
printf(" Controls Accepted: 0x%x\n",
ssStatus.dwControlsAccepted);
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);
return;
}