Re: [Boost-users] [Boost.asio] Second multicast async_send_to returns 10009

11 Aug 2008

      John Urberg  writes:
...
I'm using boost asio to send out multicast hailing messages every 15 seconds
from an ActiveX control using boost 1.35.0 and VC9.  I had a proof of concept
ActiveX working fine, but in my production ActiveX, I'm able to send the first
message successfully, but every subsequent message returns a 10009 error.
Here is the code:
MulticastServer::MulticastServer(
   boost::asio::io_service& io_service, 
   string addr, 
   int port, 
   int seconds)
: endpoint(boost::asio::ip::address::from_string(addr), port)
, socket(io_service, endpoint.protocol())
, timer(io_service)
, server_port(server_port)
, seconds(seconds)
{
   socket.set_option(boost::asio::ip::multicast::hops(32));
}
void MulticastServer::Start()
{
  HandleTimeout(boost::system::error_code());
}
void MulticastServer::HandleTimeout(const boost::system::error_code& error)
{
   string message = BuildHailMessage();
   std::strcpy(buffer, message.c_str());
   socket.async_send_to(
      boost::asio::buffer(buffer, message.length()),
      endpoint,
      boost::bind(
         &MulticastServer::HandleSendTo, 
    this,
    boost::asio::placeholders::error));
}
void MulticastServer::HandleSendTo(const boost::system::error_code& error)
{
timer.expires_from_now(boost::posix_time::seconds(seconds));
timer.async_wait(boost::bind(&MulticastServer::HandleTimeout, this,
boost::asio::placeholders::error));
}
Any ideas what would cause this error message?
Also, if I use a string instead of char[] for the buffer, I always receive a
'string iterator not dereferencable' assertion failure. How could I fix that so
I can use std::string instead of a char[] buffer?
Some more information.  I tried using sync io and I don't have issues sending
multiple times:

while (1)
{
   size_t rc = socket.send_to(boost::asio::buffer(buffer, message.length()),
endpoint);
   std::cout << "Send to returned " << rc << std::endl;
   boost::this_thread::sleep(boost::posix_time::seconds(15));
}

Here is how I'm starting the MulticastServer:

void SocketClientConnector::Start(const string& connectionName) throw(exception)
{
  this->name = connectionName;
  service_thread = new
boost::thread(boost::bind(&SocketClientConnector::RunServiceThread, this));
}

void SocketClientConnector::RunServiceThread()
{
   try
   {
      MulticastServer server(io_service, group_address, group_port, server_port,
name, id, interval);
      server.Start();
   }
   catch (exception& e)
  {
      std::cout << e.what() << std::endl;
  }
  io_service.run();
}

This is quite confusing for me as I pulled this code from the multicast_sender
example and also had it working in a separate example ActiveX.  The only thing
I'm doing different is this code is located in a separate MFC DLL that is called
from the ActiveX.

Any ideas would be appreciated.

Thanks,
John