Returns the number of bytes of data available for reading in the input buffer. Your code must call the bytesAvailable property to ensure that sufficient data is available before you try to read it with one of the read methods.

Indicates whether this URLStream object is currently connected. A call to this property returns a value of true if the URLStream object is connected, or false otherwise.

Indicates the byte order for the data. Possible values are Endian.BIG_ENDIAN or Endian.LITTLE_ENDIAN.

The default value is Endian.BIG_ENDIAN.

See also

Controls the version of Action Message Format (AMF) used when writing or reading an object.

See also

Immediately closes the stream and cancels the download operation. No data can be read from the stream after the close() method is called.

Begins downloading the URL specified in the request parameter.

Note: If a file being loaded contains non-ASCII characters (as found in many non-English languages), it is recommended that you save the file with UTF-8 or UTF-16 encoding, as opposed to a non-Unicode format like ASCII.

If the loading operation fails immediately, an IOError or SecurityError (including the local file security error) exception is thrown describing the failure. Otherwise, an open event is dispatched if the URL download starts downloading successfully, or an error event is dispatched if an error occurs.

When using this method, consider the Adobe^® Flash^® Player security model:

• Data loading is not allowed if the calling SWF file is in the local-with-file-system sandbox and the target resource is from a network sandbox.
• Data loading is also not allowed if the calling SWF file is from a network sandbox and the target resource is local.
• By default, the URL you load must be in exactly the same domain as the calling SWF file. For example, a SWF file at www.adobe.com can load data only from sources that are also at www.adobe.com. To load data from a different domain, put a cross-domain policy file on the server hosting the data.
• You can prevent a SWF file running in Flash Player from using this method by setting the allowNetworking parameter of the the object and embed tags in the HTML page that contains the SWF content.

However, in Adobe AIR, content in the application security sandbox (content installed with the AIR application) are not restricted by these security limitations.

For more information, see the following:

• The security chapter in the Programming ActionScript 3.0 book and the latest comments on LiveDocs
• The "Understanding AIR Security" section of the "Getting started with Adobe AIR" chapter in the Developing AIR Applications book.
• The Flash Player 9 Security white paper

Parameters

Reads a Boolean value from the stream. A single byte is read, and true is returned if the byte is nonzero, false otherwise.

Reads a signed byte from the stream.

The returned value is in the range -128...127.

Reads length bytes of data from the stream. The bytes are read into the ByteArray object specified by bytes, starting offset bytes into the ByteArray object.

Parameters

Reads an IEEE 754 double-precision floating-point number from the stream.

Reads an IEEE 754 single-precision floating-point number from the stream.

Reads a signed 32-bit integer from the stream.

The returned value is in the range -2147483648...2147483647.

Reads a multibyte string of specified length from the byte stream using the specified character set.

Parameters

Reads an object from the socket, encoded in Action Message Format (AMF).

See also

Reads a signed 16-bit integer from the stream.

The returned value is in the range -32768...32767.

Reads an unsigned byte from the stream.

The returned value is in the range 0...255.

Reads an unsigned 32-bit integer from the stream.

The returned value is in the range 0...4294967295.

Reads an unsigned 16-bit integer from the stream.

The returned value is in the range 0...65535.

Reads a UTF-8 string from the stream. The string is assumed to be prefixed with an unsigned short indicating the length in bytes.

Reads a sequence of length UTF-8 bytes from the stream, and returns a string.

Parameters

Dispatched when data has loaded successfully.

This event has the following properties:

Dispatched if a call to the URLStream.load() method attempts to access data over HTTP and Adobe AIR is able to detect and return the status code for the request.

If a URLStream object registers for an httpStatusEvent event, error responses are delivered as though they are content. So instead of dispatching an ioError event, the URLStream dispatches progress and complete events as the error data is loaded into the URLStream.

The HTTPStatusEvent.HTTP_RESPONSE_STATUS constant defines the value of the type property of a httpResponseStatus event object.

This event has the following properties:

See also

Dispatched if a call to URLStream.load() attempts to access data over HTTP, and Flash Player or or Adobe AIR is able to detect and return the status code for the request. (Some browser environments may not be able to provide this information.) Note that the httpStatus (if any) will be sent before (and in addition to) any complete or error event.

This event has the following properties:

See also

Dispatched when an input/output error occurs that causes a load operation to fail.

This event has the following properties:

See also

Dispatched when a load operation starts.

This event has the following properties:

See also

Dispatched when data is received as the download operation progresses. Data that has been received can be read immediately using the methods of the URLStream class.

This event has the following properties:

See also

Dispatched if a call to URLStream.load() attempts to load data from a server outside the security sandbox.

This event has the following properties:

See also

To run the example, place a file named URLStreamExample.swf in the same directory as your SWF file.

package {
    import flash.display.Sprite;
    import flash.errors.*;
    import flash.events.*;
    import flash.net.URLRequest;
    import flash.net.URLStream;

    public class URLStreamExample extends Sprite {
        private static const ZLIB_CODE:String = "CWS";
        private var stream:URLStream;

        public function URLStreamExample() {
            stream = new URLStream();
            var request:URLRequest = new URLRequest("URLStreamExample.swf");
            configureListeners(stream);
            try {
                stream.load(request);
            } catch (error:Error) {
                trace("Unable to load requested URL.");
            }
        }

        private function configureListeners(dispatcher:EventDispatcher):void {
            dispatcher.addEventListener(Event.COMPLETE, completeHandler);
            dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
            dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
            dispatcher.addEventListener(Event.OPEN, openHandler);
            dispatcher.addEventListener(ProgressEvent.PROGRESS, progressHandler);
            dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
        }

        private function parseHeader():void {
            trace("parseHeader");
            trace("isCompressed: " + isCompressed());
            trace("version: " + stream.readByte());
        }

        private function isCompressed():Boolean {
            return (stream.readUTFBytes(3) == ZLIB_CODE);
        }

        private function completeHandler(event:Event):void {
            trace("completeHandler: " + event);
            parseHeader();
        }

        private function openHandler(event:Event):void {
            trace("openHandler: " + event);
        }

        private function progressHandler(event:Event):void {
            trace("progressHandler: " + event);
        }

        private function securityErrorHandler(event:SecurityErrorEvent):void {
            trace("securityErrorHandler: " + event);
        }

        private function httpStatusHandler(event:HTTPStatusEvent):void {
            trace("httpStatusHandler: " + event);
        }

        private function ioErrorHandler(event:IOErrorEvent):void {
            trace("ioErrorHandler: " + event);
        }
    }
}