/// connect to an event mode control progam and read live events
int liveData(const std::string& host)
{
static char* junk_buffer[10000];
Poco::Net::StreamSocket s;
Poco::UInt16 port = 10000;
Poco::Net::SocketAddress address(host, port);
s.connect(address);
TCPStreamEventDataSetup setup;
while( s.available() < static_cast<int>(sizeof(setup)) )
{
Poco::Thread::sleep(1000);
}
s.receiveBytes(&setup, sizeof(setup));
if ( !setup.isValid() )
{
throw std::runtime_error("version wrong");
}
std::cerr << "run number " << setup.head_setup.run_number << std::endl;
TCPStreamEventDataNeutron events;
while(true)
{
while(s.available() < static_cast<int>(sizeof(events.head)))
{
Poco::Thread::sleep(100);
}
s.receiveBytes(&events.head, sizeof(events.head));
if ( !events.head.isValid() )
{
throw std::runtime_error("corrupt stream - you should reconnect");
}
if ( !(events.head.type == TCPStreamEventHeader::Neutron) )
{
throw std::runtime_error("corrupt stream - you should reconnect");
}
s.receiveBytes(junk_buffer, events.head.length - static_cast<uint32_t>(sizeof(events.head)));
while(s.available() < static_cast<int>(sizeof(events.head_n)))
{
Poco::Thread::sleep(100);
}
s.receiveBytes(&events.head_n, sizeof(events.head_n));
if ( !events.head_n.isValid() )
{
throw std::runtime_error("corrupt stream - you should reconnect");
}
s.receiveBytes(junk_buffer, events.head_n.length - static_cast<uint32_t>(sizeof(events.head_n)));
events.data.resize(events.head_n.nevents);
uint32_t nread = 0;
while( nread < events.head_n.nevents )
{
uint32_t ntoread = static_cast<uint32_t>(s.available() / static_cast<int>(sizeof(TCPStreamEventNeutron)));
if ( ntoread > (events.head_n.nevents - nread) )
{
ntoread = events.head_n.nevents - nread;
}
if (ntoread > 0)
{
s.receiveBytes(&(events.data[nread]), ntoread * static_cast<int>(sizeof(TCPStreamEventNeutron)));
nread += ntoread;
}
else
{
Poco::Thread::sleep(100);
}
}
if (!events.isValid())
{
throw std::runtime_error("corrupt stream - you should reconnect");
}
//TCPStreamEventHeader& head = events.head;
TCPStreamEventHeaderNeutron& head_n = events.head_n;
std::cerr << "Read " << nread << " events for frame number " << head_n.frame_number << " time " << head_n.frame_time_zero << std::endl;
for(int i=0; i<10; ++i)
{
std::cerr << events.data[i].time_of_flight << " " << events.data[i].spectrum << std::endl;
}
}
s.close();
return 0;
}
