Re: [gnet] problem with g_io_add_watch on UDP socket

["Hubert Sokolowski" <h sokolowski wsisiz edu pl>]

Hi!

> 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);
that makes no sense, you get the channel, then get fd from that channel,
then create a channel from that fd. try that
ioChannel_ = gnet_udp_socket_get_io_channel(socket_);

> 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 Soko�owski 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
>>_______________________________________________
>>gnet mailing list
>>gnet lists gnetlibrary org
>>http://lists.gnetlibrary.org/mailman/listinfo/gnet
>>
>>
>>
>>
>
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