Stopping a service

I'm trying to stop a sertvice, but the OpenService function fails, saying that the service doesn't exist...

The GetErr function is just a function which returns system error info as text.

Code:

int stopSvc(LPTSTR achSvc){
  SERVICE_STATUS_PROCESS sp;
  SERVICE_STATUS ss;
  SC_HANDLE hScM, hSvc;
  DWORD dwBytesNeeded;

  if((hScM=OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS))){
    if((hSvc=OpenService(hScM, achSvc, SERVICE_ALL_ACCESS))){
      if(!QueryServiceStatusEx(hSvc, SC_STATUS_PROCESS_INFO, (LPBYTE)&sp, sizeof(SERVICE_STATUS_PROCESS), &dwBytesNeeded)){
        GetErr("QueryServiceStatusEx");
        return(0);
      }else if(sp.dwCurrentState == SERVICE_STOPPED) 
        return(1);
      if(ControlService(hSvc, SERVICE_CONTROL_STOP, &ss)>0){
        CloseServiceHandle(hSvc);
        CloseServiceHandle(hScM);
        return(1);
      }else
        GetErr("ControlService");
    }else
      GetErr("OpenService");
    CloseServiceHandle(hSvc);
  }else
    GetErr("OpenSCManager");
  CloseServiceHandle(hScM);
  return(0);
}

The service is running on the local machine, and I'm logged on as admin. Running XP SP2/VC.Net.
Any clues?

Found the error. I'm trying to stop the service by it's display name.. I'll have to find the actual name of the service instead..