Re: Glib::IOChannel in sockets... (2)

[Glus Xof <gtglus gmail com>]

Thanks, Mr Галымжан,

I understand better... I'll try it !

Glus

2009/12/22 Галымжан Кожаев <kozhayev gmail com>:
> First you must create a socket as usual
>
> mSock = socket(AF_INET, SOCK_STREAM, 0);
>
> and connect it using connect();
> Then you can create an IOChannel from it:
>
> Glib::RefPtr<Glib::IOChannel> channel;
> #ifdef G_OS_WIN32
> channel = Glib::IOChannel::create_from_win32_socket(mSock);
> #else
> channel = Glib::IOChannel::create_from_fd(mSock);
> #endif
>
> IOChannel can be created even from Windows (winsock) sockets. After
> that you can work with this channel instead of working direct with
> socket descriptor mSock. Don't forget to set correct encoding before
> reading or writing to newly created channel.
> Listening can be done like this:
>
> Glib::signal_io().connect(sigc::mem_fun(*this,
> &MyClass::listenCallback), channel, Glib::IO_IN | Glib::IO_HUP,
> G_PRIORITY_LOW);
>
> Your MyClass::listenCallback method must handle channel events.
> Also, reading documentation is very best practice :)
> Pay attention to these pages:
> - http://library.gnome.org/devel/glibmm/stable/classGlib_1_1IOChannel.html
> - http://library.gnome.org/devel/glibmm/stable/group__MainLoop.html
> (see IO functions)
> Hope this will help you! Write if you have any questions.
>
> 2009/12/22, Glus Xof <gtglus gmail com>:
>> Hello guys,
>>
>> El 21 / desembre / 2009 23:28, Chris Vine
>> <chris cvine freeserve co uk> ha escrit:
>>> On Mon, 21 Dec 2009 16:36:57 -0500
>>> José Alburquerque <jaalburquerque cox net> wrote:
>>>
>>>> On Mon, 2009-12-21 at 18:42 +0100, Glus Xof wrote:
>>>> > Hello guys,
>>>> >
>>>> > Some days ago, I wrote,
>>>> >
>>>> > 2009/12/17 Glus Xof <gtglus gmail com>:
>>>> > > Hello guys,
>>>> > >
>>>> > > I was unsuccessfully googling, searching for an explanations
>>>> > > about how to use Glib::IOChannel in case of Sockets: a little
>>>> > > tutorial, or a code example...
>>>> >
>>>> > and I truly need to communicate two proceses running in different
>>>> > machines (by sockets), both sending & receiving Glib::ustring
>>>> > values. For the moment, using socket(), bind(), listen(), accept(),
>>>> > connect()... is enough to interchange std::string values, but I get
>>>> > "Glib::ConvertError"s with Glib::ustring.
>>>>
>>>> Maybe setting the encoding would make a difference.
>>>>
>>>> The following excerpt from the Glib::IOChannel docs[1] seems relevant:
>>>>
>>>> "Note that IOChannels implement an automatic implicit character set
>>>> conversion to the data stream, and usually will not pass by default
>>>> binary data unchanged. To set the encoding of the channel, use e.g.
>>>> set_encoding("ISO-8859-15"). To set the channel to no encoding, use
>>>> set_encoding() without any arguments."
>>>
>>> Note also that if you are sending UTF-8 over the socket you have no
>>> right to assume that a read on the socket will always produce a whole
>>> character (UTF-8 characters can be between 1 and 5 bytes long).  If you
>>> are not doing a read delimited by, say, line ends, you will need to
>>> reassemble your UTF-8.
>>>
>>> If you want some ideas here is a class that will do that for you:
>>> http://cxx-gtk-utils.cvs.sourceforge.net/viewvc/*checkout*/cxx-gtk-utils/c%2B%2B-gtk-utils/c%2B%2B-gtk-utils/reassembler.h
>>> http://cxx-gtk-utils.cvs.sourceforge.net/viewvc/*checkout*/cxx-gtk-utils/c%2B%2B-gtk-utils/c%2B%2B-gtk-utils/reassembler.cpp
>>
>> As for that Mr Albuquerque said, I think that should be possible to
>> communicate two processes by sockets using Glibmm & Giomm libraries...
>>
>> "IOChannel aims to provide portable I/O support for files, pipes and
>> sockets, and to integrate them with the GLib main event loop...."
>> (http://library.gnome.org/devel/glibmm/stable/classGlib_1_1IOChannel.html)
>>
>> The problem is that I don't reach to understand how to use them in that
>> sense...
>>
>> How can I "construct" this channel "a la Glibmm & Giomm" ?...
>>
>> Which method is the equivalent of socket() (if any) ?
>> Which method is the equivalent of bind() (if any) ?
>> Which method is the equivalent of listen ().... and accept()... and
>> connect()...
>>
>> Is it possible to create a connection based socket connections
>> suitable to interchange (in both directions) Glib::ustring values,
>> following the client-server architecture ?
>>
>> Thanks to all,
>>
>> Glus
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