Sending a command to a service from C ++

Question

how can i send command to windows service from c ++? Equivalent .NET code:

ServiceController sc = new ServiceController("MyService");
sc.ExecuteCommand(255);

Answer 1

From native C ++ you need to:

• Open the service control manager handle
• Use the service control manager to get the service handle for the service you want to control
• Send the control code or codes to the service and
• Close the descriptors opened in steps 1 and 2.

For example, this code restarts the time synchronization service. First, I create a wrapper class for service descriptors to close them automatically when I exit the block.

class CSC_HANDLE
{
public:
 CSC_HANDLE(SC_HANDLE h) : m_h(h) { }
 ~CSC_HANDLE() { ::CloseServiceHandle(m_h); }
 operator SC_HANDLE () { return m_h; }
private:
 SC_HANDLE m_h;
};

( OpenSCManager()) , . , dwDesiredAccess OpenService() , , .

BOOL RestartTimeService()
{
    CSC_HANDLE hSCM(::OpenSCManager(NULL, SERVICES_ACTIVE_DATABASE, GENERIC_READ));
    if (NULL == hSCM) return FALSE;

    CSC_HANDLE hW32Time(::OpenService(hSCM, L"W32Time", SERVICE_START | SERVICE_STOP | SERVICE_QUERY_STATUS));
    if (NULL == hW32Time) return FALSE;

, ControlService() SERVICE_CONTROL_STOP, , , . - , ERROR_SERVICE_NOT_ACTIVE, , .

    SERVICE_STATUS ss = { 0 };
    ::SetLastError(0);
    BOOL success = ::ControlService(hW32Time, SERVICE_CONTROL_STOP, &ss);
    if (!success)
    {
        DWORD le = ::GetLastError();
        switch (le)
        {
        case ERROR_ACCESS_DENIED:
        case ERROR_DEPENDENT_SERVICES_RUNNING:
        case ERROR_INVALID_HANDLE:
        case ERROR_INVALID_PARAMETER:
        case ERROR_INVALID_SERVICE_CONTROL:
        case ERROR_SERVICE_CANNOT_ACCEPT_CTRL:
        case ERROR_SERVICE_REQUEST_TIMEOUT:
        case ERROR_SHUTDOWN_IN_PROGRESS:
            return FALSE;

        case ERROR_SERVICE_NOT_ACTIVE:
        default:
            break;
        }
    }

, , , , . , :

• (1000) , , . sleep-with-message, MsgWaitForMultipleObjectsEx().

• DWORD GetTickCount() ; , , .

  DWORD waitstart(::GetTickCount());
  while (true)
  {
      ZeroMemory(&ss, sizeof(ss));
      ::QueryServiceStatus(hW32Time, &ss);
      if (SERVICE_STOPPED == ss.dwCurrentState) break;
      ::Sleep(1000);
      DWORD tick(::GetTickCount());
      if ((tick < waitstart) || (tick > (waitstart + 30000))) return FALSE;
  }
  

, , , StartService() .

    success = ::StartService(hW32Time, 0, NULL);
    if (!success) return FALSE;

    return TRUE;
}

Answer 2

ControlService, . .