# gupnp_control_point_callback_set

(PECL gupnp >= 0.1.0)

gupnp_control_point_callback_set — Set control point callback

### Description

gupnp_control_point_callback_set ( resource `$cpoint` , int `$signal` , mixed `$callback` [, mixed `$arg` ] ) : bool

Set control point callback function for signal.

### Parameters

`cpoint`

  A control point identifier, returned by gupnp_control_point_new().

`signal`

  The value of signal. Signal can be one of the following values:

  `GUPNP_SIGNAL_DEVICE_PROXY_AVAILABLE`
    Emitted whenever a new device has become available.
  `GUPNP_SIGNAL_DEVICE_PROXY_UNAVAILABLE`
    Emitted whenever a device is not available any more.
  `GUPNP_SIGNAL_SERVICE_PROXY_AVAILABLE`
    Emitted whenever a new service has become available.
  `GUPNP_SIGNAL_SERVICE_PROXY_UNAVAILABLE`
    Emitted whenever a service is not available any more.
`callback`

  The callback function for the certain signal. Typically, callback function takes on two parameters. The `proxy` parameter's identifier being the first, and the `arg` second.

`arg`

  User data for `callback`.

### Return Values

Returns `TRUE` on success or `FALSE` on failure.

### Examples

Example #1 Create new UPnP context and start browsing

`<?php
function device_proxy_available_cb($proxy, $arg)
{
$info = gupnp_device_info_get($proxy);
$type = $info['device_type'];
$location = $info['location'];
printf("Device available:\n");
printf("type: %s\n", $type);
printf("location: %s\n", $location);
}
/* Create the UPnP context */
$context = gupnp_context_new();
if (!$context) {
die("Error creating the GUPnP context\n");
}
/* We're interested in everything */
$cp = gupnp_control_point_new($context, "ssdp:all");
gupnp_control_point_callback_set($cp,
GUPNP_SIGNAL_DEVICE_PROXY_AVAILABLE, 'device_proxy_available_cb');
/* Start for browsing */
gupnp_control_point_browse_start($cp);
?>`

### Errors/Exceptions

Issues E_WARNING with not valid callback function.

### See Also

- gupnp_control_point_new() - Create a new control point
- gupnp_control_point_browse_start() - Start browsing