I'm using an ASIO extention that was suggested for file monitoring. I've added this to my project and though I see a change when I add a file to the directory being monitored, I see no futher changes thereafter. Can anyone offer some insight as to how this should work? Any help much appreciated. void create_file_handler(const boost::system:error_code &ec, const boost::asio::dir_monitor_event &ev) { cout << "file name: " << ev.filename << endl; cout << " type : " << ev.type << endl; // now edit file ... } // from within main() boost::thread t; { boost::asio::io_service io_service; boost::asio::dir_monitor dm(io_service); dm.add_directory("C:\\Users\\SRD\\DirA"); boost::asio::dir_monitor_event ev = dm.monitor(); dm.async_monitor(create_file_handler); t = boost::thread(boost::bind(&boost::asio::io_service::run, boost::refio_service))); boost::system_time time = boost::get_system_time(); time += boost::posix_time::time_duration(0, 0, 1); boost::thread::sleep(time); } t.join(); io_service.reset(); // now do app stuff ..