Re: [gnet] problem with g_io_add_watch on UDP socket

[Hubert Sokołowski <h sokolowski wsisiz edu pl>]

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