PHP手册 - Set control point callback

说明

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

Set control point callback function for signal.

参数

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.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE.

范例

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);

?>

错误/异常

Issues E_WARNING with not valid callback function.

参见

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