Sending Control Requests to a Service - Win32 Programmer's Reference

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Sending Control Requests to a Service

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 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;

// 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

TEXT("Sample_Srv"), // name of service

fdwAccess); // specify access

if (schService == NULL)

MyErrorExit("OpenService");

// Send a control value to the service.

if (! ControlService(

schService, // handle of 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;

}

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