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PROGRAM:

NAME


gupnp-binding-tool - creates C convenience wrappers for UPnP services

SYNOPSIS


gupnp-binding-tool [--prefix {PREFIX}] [--mode {client|server}] {SCPD file}

DESCRIPTION


gupnp-binding-tool takes a SCPD file and generates convenience C functions which call the
actual GUPnP functions. The client-side bindings can be seen as a service-specific version
of the GUPnPServiceProxy API and the service-side bindings are the same for GUPnPService.

These generated functions are less verbose and also safer as function call parameters are
correctly typed. Action, variable and query names are easier to get correct with bindings
(or at least the errors will be compile-time errors instead of run-time), and are also
available in editor autocompletion.

CLIENT SIDE BINDINGS


As an example, this action:

<action>
<name>DeletePortMapping</name>
<argumentList>
<argument>
<name>NewRemoteHost</name>
<direction>in</direction>
<relatedStateVariable>RemoteHost</relatedStateVariable>
</argument>
<argument>
<name>NewExternalPort</name>
<direction>in</direction>
<relatedStateVariable>ExternalPort</relatedStateVariable>
</argument>
<argument>
<name>NewProtocol</name>
<direction>in</direction>
<relatedStateVariable>PortMappingProtocol</relatedStateVariable>
</argument>
</argumentList>
</action>

Will generate the following synchronous client-side (control point) function:

static inline gboolean
igd_delete_port_mapping (GUPnPServiceProxy *proxy,
const gchar *in_new_remote_host,
const guint in_new_external_port,
const gchar *in_new_protocol,
GError **error);

As can be seen, the arguments have the correct types and are prefixed with the argument
direction.

gupnp-binding-tool generates both synchronous and asynchronous wrappers. The
igd_delete_port_mapping example above is the synchronous form, the asynchronous form is as
follows:

typedef void (*igd_delete_port_mapping_reply) (GUPnPServiceProxy *proxy,
GError *error,
gpointer userdata);

static inline GUPnPServiceProxyAction *
igd_delete_port_mapping_async (GUPnPServiceProxy *proxy,
const gchar *in_new_remote_host,
const guint in_new_external_port,
const gchar *in_new_protocol,
igd_delete_port_mapping_reply callback,
gpointer userdata);

The asynchronous form (implemented using gupnp_service_proxy_begin_action() and
gupnp_service_proxy_end_action()) will return without blocking and later invoke the
callback from the main loop when the reply is received.

The tool also creates bindings for state variable notifications. This state variable
definition:

<stateVariable sendEvents="yes">
<name>ExternalIPAddress</name>
<dataType>string</dataType>
</stateVariable>

will create this client binding that can be used to get notifications on
"ExternalIPAddress" changes:

typedef void
(*igd_external_ip_address_changed_callback) (GUPnPServiceProxy *proxy,
const gchar *external_ip_address,
gpointer userdata);

static inline gboolean
igd_external_ip_address_add_notify (GUPnPServiceProxy *proxy,
igd_external_ip_address_changed_callback callback,
gpointer userdata);

All of the examples were produced with gupnp-binding-tool --prefix igd --mode client
WANIPConnection.xml.

SERVER SIDE BINDINGS


The corresponding server bindings for the same UPnP action (DeletePortMapping) look like
this:

void
igd_delete_port_mapping_action_get (GUPnPServiceAction *action,
gchar **in_new_remote_host,
guint *in_new_external_port,
gchar **in_new_protocol);

gulong
igd_delete_port_mapping_action_connect (GUPnPService *service,
GCallback callback,
gpointer userdata);

The generated *_action_connect() function can be used to connect the action handler. The
*_action_get() and *_action_set() functions can then be used inside the action handler to
get/set action variables. If notified variables are modified, the *_variable_notify()
should be used to send the notifications (see below).

typedef gchar *(*igd_external_ip_address_query_callback) (GUPnPService *service,
gpointer userdata);

gulong
igd_external_ip_address_query_connect (GUPnPService *service,
igd_external_ip_address_query_callback callback,
gpointer userdata);
void
igd_external_ip_address_variable_notify (GUPnPService *service,
const gchar *external_ip_address);

The *_query_connect() function can be used to connect the service-specific query handler.
The return value of the handler is the returned state variable value.

All of the examples were produced with gupnp-binding-tool --prefix igd --mode server
WANIPConnection.xml.

COPYRIGHT


Copyright © 2007, 2008, 2009 OpenedHand Ltd, Nokia Corporation

Permission is granted to copy, distribute and/or modify this document under the terms of
the GNU Free Documentation License, Version 1.1 or any later version published by the Free
Software Foundation with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. You may obtain a copy of the GNU Free Documentation License from the Free Software
Foundation by visiting their Web site or by writing to:

The Free Software Foundation, Inc.,
59 Temple Place - Suite 330,
Boston, MA 02111-1307,
USA

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