[Boost-users] boost::asio::error::eof

[Lloyd]

Hi,

 

I am asynchromously reading from a file. At the file read handler there is an error checking like this-

 

if(error==boost::asio::error::eof)

{

  //do something

}

else

{

  cout<<error.messge()<<endl;

}

 

When the end of file reaches, the control does not enter into the "if portion", instead it enters the else condition and prints the message "Reached the end of the file". Am I comparing error wrongly? or else where could be the problem? How can I know that the end of file has reached?

 

Thanks a lot,

  Lloyd

 

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[Igor R]

> I am asynchromously reading from a file. At the file read handler there is
> an error checking like this-
>
> if(error==boost::asio::error::eof)
> {
>   //do something
> }
> else
> {
>   cout<<error.messge()<<endl;
> }
>
> When the end of file reaches, the control does not enter into the "if
> portion", instead it enters the else condition and prints the message
> "Reached the end of the file". Am I comparing error wrongly? or else where
> could be the problem? How can I know that the end of file has reached?

So you get some other error, not asio::error::eof. Use the debugger
and check what error code you actually get.
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[ecyrbe]

On windows you can get the system_error and not the asio misc_error, it's named boost::system::windows_error::handle_eof .
you can file a bug against boost asio to transform this error code to boost::asio::error::eof.
In fact, when you look at the code at :  "boost/asio/detail/impl/win_iocp_handle_service.ipp"
the sync version is ok (it transforms handle_eof to boost::asio::eof) but the async one does not...

2010/7/10 Igor R <boost...@gmail.com>

[Lloyd]

Thanks a lot, it works now. I shall file a bug.

 

Thank you,

  Lloyd

----- Original Message -----

From: ecyrbe

To: boost...@lists.boost.org

Sent: Sunday, July 11, 2010 9:32 AM

Subject: Re: [Boost-users] boost::asio::error::eof

On windows you can get the system_error and not the asio misc_error, it's named boost::system::windows_error::handle_eof .
you can file a bug against boost asio to transform this error code to boost::asio::error::eof.
In fact, when you look at the code at :  "boost/asio/detail/impl/win_iocp_handle_service.ipp"
the sync version is ok (it transforms handle_eof to boost::asio::eof) but the async one does not...

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