[Boost-users] boost asio - async_read and deadline_timer don't call their handler functions

Subject: [Boost-users] boost asio - async_read and deadline_timer don't call their handler functions
From: Gözde Bahar KOÞ (gkos_at_[hidden])
Date: 2009-11-25 03:45:33

Hello,

I want to use asio library for my serial communication module but I'm having trouble on asynchronous functionality.

In the following code block, I wanted to read 5 bytes from the first serial port of my computer in 10 seconds. But none of the handler functions were called. Firstly I waited not inputing any bytes but timer did not call wait_handler. Secondly I sent 5 bytes in 10 seconds from the other computer but read_handler was not called.

I could read the bytes using synchronous functions like read function, I mean there is nothing wrong with the communication.

I tried this code both on a Windows and a Linux host but results were the same..

Can you please check what can be wrong with the following code?

**************************************************************
#include <iostream>
#include <boost/asio.hpp>
#include <boost/asio/buffer.hpp>
#include <boost/asio/deadline_timer.hpp>
using namespace std;
using namespace boost::asio;
using namespace boost::system;
using namespace boost::posix_time;

struct wait_handler {
  void operator()(const error_code& ec){
    cout << "Timeout!" << endl;
  }
};

struct read_handler {
  void operator()(const error_code& ec, size_t bytes_transferred) {
    cout << "Data read!" << endl;
  }
};

int main(int argc, char* argv[])
{
  char read_msg_[5];

  io_service io;
  serial_port theport(io, "com1");

  deadline_timer * timer = new deadline_timer(io);
  timer->expires_from_now(seconds(10));
  wait_handler whandler;
  timer->async_wait(whandler);

  read_handler rhandler;
  async_read(theport, buffer(read_msg_, 5), rhandler);

  Sleep(30000); //30 seconds
  return 0;
}
**************************************************************

Best Regards,
Gözde Bahar Koþ
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