SC_HANDLE GetServiceHandle(char *ServiceName){
char CompName[MAX_COMPUTERNAME_LENGTH + 1];
ULONG nSize=MAX_COMPUTERNAME_LENGTH;
wchar_t CompNameW[MAX_COMPUTERNAME_LENGTH + 1];
SC_HANDLE sc;
if(!GetComputerNameA(CompName,&nSize)){
    Msg(SERROR,NULL,"Did not get computer name");
    return NULL;
}
ConvertCharToWchar_t(CompName,CompNameW);
wchar_t BaseW[MAXBASENAMELEN];
ConvertCharToWchar_t(SERVICES_ACTIVE_DATABASE,BaseW);

sc=OpenSCManagerW(CompNameW,BaseW, GENERIC_READ/*SC_MANAGER_ALL_ACCESS*/);
int err=GetLastError();
AnsiString s="";
switch(err){
    case ERROR_ACCESS_DENIED:
        s="The requested access was denied.";
        break;
    case ERROR_DATABASE_DOES_NOT_EXIST:
        s="The specified database does not exist.";
        break;
}
if(!s.IsEmpty()){
    Msg(SERROR,NULL,s.c_str());
    return NULL;
}

// Get a handle to the service.
// https://docs.microsoft.com/ru-ru/windows/win32/services/stopping-a-service
SC_HANDLE hService;  // service handle
hService = OpenService( sc,ServiceName /* из cfg */,
  SERVICE_STOP | SERVICE_QUERY_STATUS | SERVICE_ENUMERATE_DEPENDENTS);
if (!hService){
    err=GetLastError();
    Msg(SERROR,NULL, "OpenService failed. GetLastError=%d", err);
        CloseServiceHandle(sc);
        return NULL;
}
return hService;
}