Re: [Boost-users] [Boost-uses] [asio] Callbacks not getting called

Subject: Re: [Boost-users] [Boost-uses] [asio] Callbacks not getting called
From: Tom Kent (lists_at_[hidden])
Date: 2010-03-11 15:13:38

One important detail I forgot in my last post.

When I run in the server and the client has already sent its payload
(several seconds ago) and the server is just waiting in the loop for its
callback.  At this point, if I break in the debugger, I can see that
indeed the data has been received and put into the buffer that was setup
to receive it!!!

So the transfer is going well, it is just that the callback isn't
getting called.

Tom

-------- Original Message --------
Subject: [asio] Callbacks not getting called
Date: Thu, 11 Mar 2010 14:08:46 -0600
From: Tom Kent <lists_at_[hidden]>
To: boost-users_at_[hidden]

I posted something about this a couple days ago, but it was fairly
complex, and had some typos in it.  Here's another try, where I've
trimmed it down even more, trying to get to the meat of the problem.
I'm just using c-style functions for the callback now and its still not
working.

What I am doing:

   1. Start a server process
   2. The server process makes an empty socket and uses it to listen
(with a tcp::acceptor) for TCP connections on a port (10010 for example)
   3. Start a client process
   4. Have the client process create a socket connect to the server's port
   5. When the server sees a client is connecting, it starts listening
for data(with async_read) on the socket and creates another empty socket
to listen for another TCP connection on the port
   6. When the client sees that the server has connected, it sends 100
bytes of data (with async_write) and waits for the socket to tell it the
send is finished...when that happens it prints a message and shuts down
   7. When the server gets notified that its has data that has been
read, it prints a message and shuts down

I'm running on windows (originally with boost_1_38_0, but today I tired
with boost_1_42_0 with the same results) and have a visual studio solution
file you can get (http://boost.teeks99.com/BoostConnectionTest.zip) if
you're interested.

BoostConnectionServer.cpp:
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <iostream>

using namespace boost::asio::ip;

boost::asio::io_service* io_service_;
tcp::acceptor* acceptor_;
tcp::socket* sock1_;
tcp::socket* sock2_;
bool conn1Done_;
bool gotTransfer_;

void HandleAccept(const boost::system::error_code& error)
{
   conn1Done_ = true;
   sock2_ = new tcp::socket(*io_service_);
   acceptor_->async_accept(*sock2_, HandleAccept);
}

// Doesn't compile with one param like the chat example
//void HandleTransfer(const boost::system::error_code& error)
// Compiles with 2 params, but never gets called
void HandleTransfer(const boost::system::error_code& error, size_t bytes)
{
   if(!error)
      gotTransfer_;
   else
      std::cout << error << std::endl;
}

int main(int argc, char* argv[])
{
   io_service_ = new boost::asio::io_service();
   conn1Done_ = false;
   gotTransfer_ = false;

   sock1_ = new tcp::socket(*io_service_);

   tcp::endpoint endpoint(tcp::v4(), 10011);
   acceptor_ = new tcp::acceptor(*io_service_, endpoint);
   acceptor_->async_accept(*sock1_, HandleAccept);
   boost::thread t(boost::bind(&boost::asio::io_service::run, io_service_));

   while(!conn1Done_)
   {
      boost::this_thread::sleep(boost::posix_time::millisec(1));
   }
   std::cout << "Accepted incoming connection\n";

   char data[100];

   boost::asio::async_read(*sock1_, boost::asio::buffer(data, 100),
HandleTransfer);

   while(!gotTransfer_)
   {
      boost::this_thread::sleep(boost::posix_time::millisec(1));
   }

   std::cout << "Success!\n";
   return 0;
}

BoostConnectionClient.cpp:
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <iostream>

using namespace boost::asio::ip;

boost::asio::io_service* io_service_;
tcp::socket* sock_;

bool connected_;
bool gotTransfer_;

void HandleConnect(const boost::system::error_code& error)
{
   if(!error)
      connected_ = true;
   else
      std::cout << error << std::endl;
}

// Doesn't compile with one param like the chat example
//void HandleTransfer(const boost::system::error_code& error)
// Compiles with 2 params, but never gets called
void HandleTransfer(const boost::system::error_code& error, size_t bytes)
{
   if(!error)
      gotTransfer_;
   else
      std::cout << error << std::endl;
}

int main(int argc, char* argv[])
{
   connected_ = false;
   gotTransfer_ = false;

   io_service_ = new boost::asio::io_service();
   sock_ = new tcp::socket(*io_service_);

   tcp::endpoint ep(address::from_string("127.0.0.1"), 10011);
   sock_->async_connect(ep, HandleConnect);

   boost::thread t(boost::bind(&boost::asio::io_service::run, io_service_));

   while(!connected_)
   {
      boost::this_thread::sleep(boost::posix_time::millisec(1));
   }
   std::cout << "Connected\n";

   char data[100];
   data[0] = 0; data[1] = 1; data[2] = 2; data[3] = 3; data[99] = 99;

   boost::asio::async_write(*sock_, boost::asio::buffer(data, 100),
      HandleTransfer);

   while(!gotTransfer_)
   {
      boost::this_thread::sleep(boost::posix_time::millisec(1));
   }

   std::cout << "Done\n";

   return 0;
}

Any thoughts on what I'm doing incorrectly here would be much
appreciated.  Thanks in advance :-)
Tom Kent