Re: [gnet] problem with g_io_add_watch on UDP socket

[tc6 <tc6 free fr>]

Here is what I did (it still doesn't work, but I can compile and the 
callback is called):

int fd = g_io_channel_unix_get_fd(gnet_udp_socket_get_io_channel(socket_));
ioChannel_ = Glib::IOChannel::create_from_fd(fd);
ioSource_ = Glib::IOSource::create(ioChannel_, Glib::IO_IN|Glib::IO_OUT| 
Glib::IO_HUP|Glib::IO_ERR|Glib::IO_NVAL);
ioSource_->connect(sigc::mem_fun(*this, &netConnect::client));
ioSource_->attach(Glib::MainContext::get_default());

The problem now is that the callback: netConnect::client is called but 
only IO_OUT condition is true and never IO_IN (the server is sending 
string on the other side of the channel, so that the client should 
normally receive something).

I try both read/write functions (of IOChannel) and gnet receive/send 
method and none of them works. Is it possible that the IOChannel is 
write or read protected?

fd is the same for both client and server (which is a pretty good thing 
I guess)

If someone has an idea on how this could work (or if it will work one 
day...)
I had another question about using a non blocking "receive" function (I 
thing it is in documentation but can't remember where...).

Thank you

Hubert Sokołowski wrote:

> Hi!
>
> On Sat, 16 Apr 2005 17:03:17 +0200
> tc6 <tc6 free fr> wrote:
>
>  
>
> > Hello,
> >
> > I'm experiencing problems to make g_io_add_watch works with an udp
> > socket.
> >
> > Here is my code :
> >  GIOChannel *ioC_;
> >  ioC_ = gnet_udp_socket_get_io_channel(socket_);
> >  g_io_add_watch(ioC_, G_IO_IN, greceive, socket_);
> >
> > where greceive is defined as follows:
> >
> > static gboolean greceive(GIOChannel *source, GIOCondition cond, void
> > *data)
> > {
> >  char buffer[100];
> >  gsize bytesRead = 0;
> >  GInetAddr* addr;
> >  GUdpSocket *sock = (GUdpSocket *)data;
> >
> >  std::cout<<"Received something "<<std::endl;
> >  if (cond & (G_IO_IN))
> >    {
> >      gnet_udp_socket_receive(sock, buffer, sizeof(buffer), &addr);
> >      std::cout<<"Received buffer: "<<buffer<<std::endl;
> >    }
> >  else if (cond & (G_IO_ERR | G_IO_NVAL | G_IO_HUP))
> >    {
> >      std::cout<<"Error received"<<std::endl;
> >      return false;
> >    }
> > }
> >
> > The problem is here that the callback is never called (indeed
> > "Received
> > something" is never printed).
> >    
> do you run g_main_loop_run in the begining of your program? 
> g_io_add_watch requires glib main loop to be running.
> I am not sure whether you can use glib/gnet in a C++ program.
>
>  
>
> > Is it possible to use read/write
> > functions
> > for the GIOChannel or not (as mentionned in documentation)?
> >    
> you can use g_io_channel_unix_get_fd to get the file handle, but
> you should use g_io_channel_* set of functions to read and write.
>
> hs
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