ServiceManager::ServiceManager()
:m_schSCManager(OpenSCManager(nullptr, nullptr, SC_MANAGER_ALL_ACCESS))
{
if (!m_schSCManager)
{
throw UsbDkServiceManagerFailedException(TEXT("OpenSCManager failed"));
}
}
void ServiceManager::DeleteServiceObject(const tstring &ServiceName)
{
SCMHandleHolder schService(OpenServiceObject(ServiceName));
WaitForServiceStop(schService);
if (!DeleteService(schService))
{
throw UsbDkServiceManagerFailedException(TEXT("DeleteService failed"));
}
}
void ServiceManager::StartServiceObject(const tstring &ServiceName)
{
SCMHandleHolder schService(OpenServiceObject(ServiceName));
if (!StartService(SC_HANDLE(schService), 0, NULL))
{
throw UsbDkServiceManagerFailedException(TEXT("StartService failed"));
}
return;
}
void ServiceManager::CreateServiceObject(const tstring &ServiceName, const tstring &ServicePath)
{
assert(m_schSCManager);
SCMHandleHolder schService(CreateService(m_schSCManager, ServiceName.c_str(), ServiceName.c_str(), SERVICE_ALL_ACCESS, SERVICE_KERNEL_DRIVER,
SERVICE_DEMAND_START, SERVICE_ERROR_NORMAL, ServicePath.c_str(), nullptr, nullptr, nullptr, nullptr, nullptr));
if (!schService)
{
throw UsbDkServiceManagerFailedException(TEXT("CreateService failed"));
}
}
SC_HANDLE ServiceManager::OpenServiceObject(const tstring & ServiceName)
{
assert(m_schSCManager);
SC_HANDLE sch = OpenService(m_schSCManager, ServiceName.c_str(), SERVICE_ALL_ACCESS);
if (!sch)
{
auto err = GetLastError();
throw UsbDkServiceManagerFailedException(TEXT("OpenService failed"), err);
}
return sch;
}
void ServiceManager::DeleteServiceObject(const tstring &ServiceName)
{
assert(m_schSCManager);
SCMHandleHolder schService(OpenService(m_schSCManager, ServiceName.c_str(), SERVICE_ALL_ACCESS));
if (!schService)
{
auto err = GetLastError();
if (err != ERROR_SERVICE_DOES_NOT_EXIST)
{
throw UsbDkServiceManagerFailedException(TEXT("OpenService failed with error "), err);
}
return;
}
WaitForServiceStop(schService);
if (!DeleteService(schService))
{
throw UsbDkServiceManagerFailedException(TEXT("DeleteService failed"));
}
}
void ServiceManager::WaitForServiceStop(const SCMHandleHolder &schService)
{
static const DWORD SERVICE_STOP_WAIT_QUANTUM = 50;
static const DWORD SERVICE_STOP_ITERATIONS = 20000 / 50; //Total timeout is 20 seconds
SERVICE_STATUS_PROCESS ssp;
DWORD iterationNumber = 0;
do
{
Sleep(SERVICE_STOP_WAIT_QUANTUM);
DWORD bytesNeeded;
if (!QueryServiceStatusEx(schService, SC_STATUS_PROCESS_INFO, (LPBYTE)&ssp, sizeof(SERVICE_STATUS_PROCESS), &bytesNeeded))
{
throw UsbDkServiceManagerFailedException(TEXT("QueryServiceStatusEx failed"));
}
} while ((ssp.dwCurrentState != SERVICE_STOPPED) && (iterationNumber++ < SERVICE_STOP_ITERATIONS));
}
