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|
<?xml version="1.0" encoding="utf-8"?>
<s:Group width="640" height="480" xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx">
<!-- Script block -->
<fx:Script>
<![CDATA[
// Imports
import flash.events.Event;
import flash.events.ProgressEvent;
import flash.net.Socket;
import flash.utils.ByteArray;
import mx.utils.Base64Encoder;
// Private properties
private var buffer:ByteArray = null;
private var _last:ByteArray = null;
private var _port:int = 0;
private var start:int = 0;
private var socket:Socket = null;
private var _host:String = null;
private var _file:String = null;
private var _password:String = null;
private var _username:String = null;
// **
// Public methods
// **
// Called to start stream capture
// Setup buffer and connect socket
public function stream( host:String, port:Number, file:String ):void
{
this.host = host;
this.port = port;
this.file = file;
buffer = new ByteArray();
socket = new Socket();
socket.addEventListener( Event.CONNECT, doSocketConnect );
socket.addEventListener( ProgressEvent.SOCKET_DATA, doSocketData );
socket.connect( host, port );
}
// **
// Private methods
// **
// Called to load the latest image
private function display( image:ByteArray ):void
{
var loader:SWFLoader = null;
// Save reference to last JPEG
last = image;
// Get loader from back
// Populate with new image
// Event handler triggers swap
// Minimizes flicker
loader = getElementAt( 0 ) as SWFLoader;
loader.source = image;
}
// Called to find a JPEG image in the loaded bytes
private function find():Boolean
{
var value:Boolean = false;
var copy:ByteArray = null;
var image:ByteArray = null;
var marker:ByteArray = null;
var end:int = 0;
var offset:int = 0;
offset = start;
marker = new ByteArray();
// If there are bytes and the offset is at the start
// Look for a JPEG image
if( buffer.length > 1 )
{
if( start == 0 )
{
// Look for the start of the JPEG
for( offset; offset < buffer.length - 1; offset++ )
{
buffer.position = offset;
buffer.readBytes( marker, 0, 2 );
if( marker[0] == 255 && marker[1] == 216 )
{
start = offset;
break;
}
}
}
// Look for the end of the JPEG
for( offset; offset < buffer.length - 1; offset++ )
{
buffer.position = offset;
buffer.readBytes( marker, 0, 2 );
if( marker[0] == 255 && marker[1] == 217 )
{
end = offset;
// Grab image if an end is found
image = new ByteArray();
buffer.position = start;
buffer.readBytes( image, 0, end - start );
// Display
display( image );
// Remove image from incoming buffer
copy = new ByteArray();
buffer.position = end;
buffer.readBytes( copy, 0 );
buffer = copy;
// Reset values
start = 0;
offset = 0;
// Denote that an image has been found
value = true;
}
}
}
// No image found by default
return value;
}
// **
// Event handlers
// **
// Called when the background image has finished loading
// Swaps the two loaders to pull background to front
// Called when loaded to minimize flicker
protected function doLoadComplete( event:Event ):void
{
swapElements( one, two );
}
// Called when the socket has connected
// Sends the initial HTTP request to start the stream
protected function doSocketConnect( event:Event ):void
{
var auth:Base64Encoder = null;
var request:String = null;
var source:String = null;
// HTTP GET
request = "GET " + file + " HTTP/1.1\r\nHost: localhost:80\r\n";
// Include username and password if needed
// Your specific implementation may vary
if( username != null && password != null )
{
source = username + ":" + password;
auth = new Base64Encoder();
auth.encode( source );
request = request + "Authorization: Basic " + auth.toString() + "\r\n";
}
// Keep the HTTP connection alive
// Stream the image bytes for as long as the socket is connected
request = request + "Connection: keep-alive\r\n\r\n";
// Send HTTP GET request
// Starts the stream
socket.writeMultiByte( request, "us-ascii" );
}
// Called when there are new bytes on the socket
// Reads the bytes into the buffer
// Attempts to find, extract and display the image
protected function doSocketData( event:ProgressEvent ):void
{
socket.readBytes( buffer, buffer.length );
while( find() ) {;}
}
// **
// Access methods
// **
public function get last():ByteArray
{
return _last;
}
public function set last( value:ByteArray ):void
{
_last = value;
}
public function get port():int
{
return _port;
}
public function set port( value:int ):void
{
_port = value;
}
public function get file():String
{
return _file;
}
public function set file( value:String ):void
{
_file = value;
}
public function get host():String
{
return _host;
}
public function set host( value:String ):void
{
_host = value;
}
public function get password():String
{
return _password;
}
public function set password( value:String ):void
{
_password = value;
}
public function get username():String
{
return _username;
}
public function set username( value:String ):void
{
_username = value;
}
]]>
</fx:Script>
<!-- Two instances -->
<!-- Swapped out to reduce flicker -->
<!-- Versus loading new bytes into single loader -->
<mx:SWFLoader
id="one"
horizontalCenter="0"
verticalCenter="0"
complete="doLoadComplete( event )"/>
<mx:SWFLoader
id="two"
horizontalCenter="0"
verticalCenter="0"
complete="doLoadComplete( event )"/>
</s:Group> |
La classe spark.components::Group est introuvable
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