Re: [Boost-users] ASIO file monitoring help

Subject: Re: [Boost-users] ASIO file monitoring help
From: Boris Schaeling (boris_at_[hidden])
Date: 2013-04-10 18:34:19

On Wed, 10 Apr 2013 20:43:15 +0200, SRD  
<software.research.development_at_[hidden]> wrote:

> [...]Can anyone offer some insight as to how this should work? Any help  
> much
> appreciated.

I strongly recommend you to read the tutorial at  
<http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/tutorial.html>  
or the chapter <http://en.highscore.de/cpp/boost/asio.html> from where you  
downloaded the file monitor to get a basic understanding how Boost.Asio is  
used.

> [...]            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);

You should call either monitor() or async_monitor(). The first is a  
blocking call, the second an asynchronous call. The call to monitor() only  
returns when something happened. If nothing happens monitor() never  
returns. async_monitor() returns immediately though. And when something  
happens create_file_handler() is called.

Boris

> [...]