C++ Make service do something - c++

Question

I made a service using a tutorial. How can I make it actually do something? Here's the code:
#include <windows.h>
SERVICE_STATUS serviceStatus = { 0 };
SERVICE_STATUS_HANDLE statusHandle;
HANDLE serviceStopEvent = INVALID_HANDLE_VALUE;
void WINAPI ServiceMain(DWORD argc, LPTSTR *argv);
void WINAPI ServiceCtrlHandler(DWORD);
DWORD WINAPI ServiceWorkerThread(LPVOID lParam);
#define SERVICE_NAME "Cool Service"
int main(int argc, char **argv)
{
SERVICE_TABLE_ENTRY serviceTable[] =
{
{SERVICE_NAME, (LPSERVICE_MAIN_FUNCTION)ServiceMain},
{NULL, NULL}
};
if (!StartServiceCtrlDispatcher(serviceTable))
return GetLastError();
return 0;
}
void WINAPI ServiceMain(DWORD argc, LPTSTR *argv)
{
DWORD status = E_FAIL;
statusHandle = RegisterServiceCtrlHandler(SERVICE_NAME, ServiceCtrlHandler);
if (statusHandle == NULL)
goto EXIT;
ZeroMemory(&serviceStatus, sizeof(serviceStatus));
serviceStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
serviceStatus.dwControlsAccepted = 0;
serviceStatus.dwCurrentState = SERVICE_START_PENDING;
serviceStatus.dwWin32ExitCode = 0;
serviceStatus.dwServiceSpecificExitCode = 0;
serviceStatus.dwCheckPoint = 0;
if (!SetServiceStatus(statusHandle, &serviceStatus))
OutputDebugString("Cool Service: Service Main: SetServiceStatus returned error!");
serviceStopEvent = CreateEvent(NULL, true, false, NULL);
if (serviceStopEvent == NULL)
{
serviceStatus.dwControlsAccepted = 0;
serviceStatus.dwCurrentState = SERVICE_STOPPED;
serviceStatus.dwWin32ExitCode = GetLastError();
serviceStatus.dwCheckPoint = 1;
if (!SetServiceStatus(statusHandle, &serviceStatus))
OutputDebugString("Cool Service: Service Main: SetServiceStatus returned error!");
goto EXIT;
}
serviceStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;
serviceStatus.dwCurrentState = SERVICE_RUNNING;
serviceStatus.dwWin32ExitCode = 0;
serviceStatus.dwCheckPoint = 0;
if (!SetServiceStatus(statusHandle, &serviceStatus))
OutputDebugString("Cool Service: Service Main: SetServiceStatus returned error!");
HANDLE thread = CreateThread(NULL, 0, ServiceWorkerThread, NULL, 0, NULL);
WaitForSingleObject(thread, INFINITE);
CloseHandle(serviceStopEvent);
serviceStatus.dwControlsAccepted = 0;
serviceStatus.dwCurrentState = SERVICE_STOPPED;
serviceStatus.dwWin32ExitCode = 0;
serviceStatus.dwCheckPoint = 3;
if (!SetServiceStatus(statusHandle, &serviceStatus))
OutputDebugString("Cool Service: Service Main: SetServiceStatus returned error!");
EXIT:
return;
}
void WINAPI ServiceCtrlHandler(DWORD ctrlCode)
{
switch (ctrlCode)
{
case SERVICE_CONTROL_STOP:
{
if (serviceStatus.dwCurrentState != SERVICE_RUNNING)
break;
serviceStatus.dwControlsAccepted = 0;
serviceStatus.dwCurrentState = SERVICE_STOP_PENDING;
serviceStatus.dwWin32ExitCode = 0;
serviceStatus.dwCheckPoint = 4;
if (!SetServiceStatus(statusHandle, &serviceStatus))
OutputDebugString("Cool Service: Service Handler: SetServiceStatus returned error!");
SetEvent(serviceStopEvent);
break;
}
default: break;
}
}
void Function()
{
Beep(7000, 1000);
}
DWORD WINAPI ServiceWorkerThread(LPVOID lParam)
{
while (WaitForSingleObject(serviceStopEvent, 0) != WAIT_OBJECT_0)
{
Function();
Sleep(3000);
}
return ERROR_SUCCESS;
}
The service does nothing after I install and start it in "services.msc", it should beep, right? Or my thinking is off the way here. Thanks for help :)