Interface

GioSocketConnectable

Description [src]

interface Gio.SocketConnectable : GObject.Object

Objects that describe one or more potential socket endpoints implement GSocketConnectable. Callers can then use g_socket_connectable_enumerate() to get a GSocketAddressEnumerator to try out each socket address in turn until one succeeds, as shown in the sample code below.

MyConnectionType *
connect_to_host (const char    *hostname,
                 guint16        port,
                 GCancellable  *cancellable,
                 GError       **error)
{
  MyConnection *conn = NULL;
  GSocketConnectable *addr;
  GSocketAddressEnumerator *enumerator;
  GSocketAddress *sockaddr;
  GError *conn_error = NULL;

  addr = g_network_address_new (hostname, port);
  enumerator = g_socket_connectable_enumerate (addr);
  g_object_unref (addr);

  // Try each sockaddr until we succeed. Record the first connection error,
  // but not any further ones (since they'll probably be basically the same
  // as the first).
  while (!conn && (sockaddr = g_socket_address_enumerator_next (enumerator, cancellable, error))
    {
      conn = connect_to_sockaddr (sockaddr, conn_error ? NULL : &conn_error);
      g_object_unref (sockaddr);
    }
  g_object_unref (enumerator);

  if (conn)
    {
      if (conn_error)
        {
          // We couldn't connect to the first address, but we succeeded
          // in connecting to a later address.
          g_error_free (conn_error);
        }
      return conn;
    }
  else if (error)
    {
      /// Either initial lookup failed, or else the caller cancelled us.
      if (conn_error)
        g_error_free (conn_error);
      return NULL;
    }
  else
    {
      g_error_propagate (error, conn_error);
      return NULL;
    }
}

Prerequisite

In order to implement SocketConnectable, your type must inherit fromGObject.

Implementations

Instance methods

g_socket_connectable_enumerate

Creates a GSocketAddressEnumerator for connectable.

since: 2.22

g_socket_connectable_proxy_enumerate

Creates a GSocketAddressEnumerator for connectable that will return a GProxyAddress for each of its addresses that you must connect to via a proxy.

since: 2.26

g_socket_connectable_to_string

Format a GSocketConnectable as a string. This is a human-readable format for use in debugging output, and is not a stable serialization format. It is not suitable for use in user interfaces as it exposes too much information for a user.

since: 2.48

Interface structure

struct GioSocketConnectableIface {
  GTypeInterface g_iface;
  GSocketAddressEnumerator* (* enumerate) (
    GSocketConnectable* connectable
  );
  GSocketAddressEnumerator* (* proxy_enumerate) (
    GSocketConnectable* connectable
  );
  gchar* (* to_string) (
    GSocketConnectable* connectable
  );
  
}

Provides an interface for returning a GSocketAddressEnumerator and GProxyAddressEnumerator.

Interface members

`g_iface`	`GTypeInterface`
	The parent interface.
`enumerate`	`GSocketAddressEnumerator* (* enumerate) ( GSocketConnectable* connectable )`
	Creates a `GSocketAddressEnumerator`.
`proxy_enumerate`	`GSocketAddressEnumerator* (* proxy_enumerate) ( GSocketConnectable* connectable )`
	Creates a `GProxyAddressEnumerator`.
`to_string`	`gchar* (* to_string) ( GSocketConnectable* connectable )`
	Format the connectable’s address as a string for debugging. Implementing this is optional. (Since: 2.48).

Virtual methods

Gio.SocketConnectable.enumerate