Packageflash.net
Classpublic class URLStream
InheritanceURLStream Inheritance EventDispatcher Inheritance Object
ImplementsIDataInput

Language version: ActionScript 3.0
Runtime version: 

The URLStream class provides low-level access to downloading URLs. Data is made available to application code immediately as it is downloaded, instead of waiting until the entire file is complete as with URLLoader. The URLStream class also lets you close a stream before it finishes downloading. The contents of the downloaded file are made available as raw binary data.

The read operations in URLStream are nonblocking. This means that you must use the bytesAvailable property to determine whether sufficient data is available before reading it. An EOFError exception is thrown if insufficient data is available.

All binary data is encoded by default in big-endian format, with the most significant byte first.

The security rules that apply to URL downloading with the URLStream class are identical to the rules applied to URLLoader objects. Policy files may be downloaded as needed. Local file security rules are enforced, and security warnings are raised as needed.

View the examples.

See also

URLLoader
URLRequest


Public Properties
 PropertyDefined by
  bytesAvailable : uint
[read-only] Returns the number of bytes of data available for reading in the input buffer.
URLStream
  connected : Boolean
[read-only] Indicates whether this URLStream object is currently connected.
URLStream
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
  endian : String
Indicates the byte order for the data.
URLStream
  objectEncoding : uint
Controls the version of Action Message Format (AMF) used when writing or reading an object.
URLStream
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
Public Methods
 MethodDefined by
 Inherited
addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.
EventDispatcher
  
Immediately closes the stream and cancels the download operation.
URLStream
 Inherited
Dispatches an event into the event flow.
EventDispatcher
 Inherited
Checks whether the EventDispatcher object has any listeners registered for a specific type of event.
EventDispatcher
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
  
load(request:URLRequest):void
Begins downloading the URL specified in the request parameter.
URLStream
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
  
Reads a Boolean value from the stream.
URLStream
  
Reads a signed byte from the stream.
URLStream
  
readBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0):void
Reads length bytes of data from the stream.
URLStream
  
Reads an IEEE 754 double-precision floating-point number from the stream.
URLStream
  
Reads an IEEE 754 single-precision floating-point number from the stream.
URLStream
  
Reads a signed 32-bit integer from the stream.
URLStream
  
readMultiByte(length:uint, charSet:String):String
Reads a multibyte string of specified length from the byte stream using the specified character set.
URLStream
  
Reads an object from the socket, encoded in Action Message Format (AMF).
URLStream
  
Reads a signed 16-bit integer from the stream.
URLStream
  
Reads an unsigned byte from the stream.
URLStream
  
Reads an unsigned 32-bit integer from the stream.
URLStream
  
Reads an unsigned 16-bit integer from the stream.
URLStream
  
Reads a UTF-8 string from the stream.
URLStream
  
Reads a sequence of length UTF-8 bytes from the stream, and returns a string.
URLStream
 Inherited
removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void
Removes a listener from the EventDispatcher object.
EventDispatcher
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
 Inherited
Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.
EventDispatcher
Events
 EventSummaryDefined by
 Inherited [broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.EventDispatcher
   Dispatched if a call to URLStream.load() attempts to load data from a server with an invalid certificate (for example, self-signed or untrusted, or with an invalid date).URLStream
   Dispatched when data has loaded successfully.URLStream
 Inherited [broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.EventDispatcher
   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.URLStream
   Dispatched if a call to URLStream.load() attempts to access data over HTTP, and Flash Player or Adobe AIR is able to detect and return the status code for the request.URLStream
   Dispatched when an input/output error occurs that causes a load operation to fail.URLStream
   Dispatched when a load operation starts.URLStream
   Dispatched when data is received as the download operation progresses.URLStream
   Dispatched if a call to URLStream.load() attempts to load data from a server outside the security sandbox.URLStream
Property detail
bytesAvailableproperty
bytesAvailable:uint  [read-only]

Language version: ActionScript 3.0
Runtime version: 

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.

Implementation
    public function get bytesAvailable():uint
connectedproperty 
connected:Boolean  [read-only]

Language version: ActionScript 3.0
Runtime version: 

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.

Implementation
    public function get connected():Boolean
endianproperty 
endian:String  [read-write]

Language version: ActionScript 3.0
Runtime version: 

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

The default value is Endian.BIG_ENDIAN.

Implementation
    public function get endian():String
    public function set endian(value:String):void

See also

objectEncodingproperty 
objectEncoding:uint  [read-write]

Language version: ActionScript 3.0
Runtime version: 

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

Implementation
    public function get objectEncoding():uint
    public function set objectEncoding(value:uint):void

See also

Method detail
close()method
public function close():void

Language version: ActionScript 3.0
Runtime version: 

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


Throws
Error — The stream could not be closed, or the stream was not open.
load()method 
public function load(request:URLRequest):void

Language version: ActionScript 3.0
Runtime version: 

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.

By default, the calling SWF file and the URL you load must be in exactly the same domain. 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, place a URL policy file on the server hosting the data.

In Flash Player, you cannot connect to commonly reserved ports. For a complete list of blocked ports, see "Restricting Networking APIs" in the ActionScript 3.0 Developer's Guide.

In Flash Player, you can prevent a SWF file 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.

In Flash Player 10 and later, and in AIR 1.5 and later, if you use a multipart Content-Type (for example "multipart/form-data") that contains an upload (indicated by a "filename" parameter in a "content-disposition" header within the POST body), the POST operation is subject to the security rules applied to uploads:

Also, for any multipart Content-Type, the syntax must be valid (according to the RFC2046 standards). If the syntax appears to be invalid, the POST operation is subject to the security rules applied to uploads.

These rules also apply to AIR content in non-application sandboxes. However, in Adobe AIR, content in the application sandbox (content installed with the AIR application) are not restricted by these security limitations.

For more information related to security, see The Flash Player Developer Center Topic: Security.

In AIR, a URLRequest object can register for the httpResponse status event. Unlike the httpStatus event, the httpResponseStatus event is delivered before any response data. Also, the httpResponseStatus event includes values for the responseHeaders and responseURL properties (which are undefined for an httpStatus event. Note that the httpResponseStatus event (if any) will be sent before (and in addition to) any complete or error event.

If there is an httpResponseStatus event listener, the body of the response message is always sent; and HTTP status code responses always results in a complete event. This is true in spite of whether the HTTP response status code indicates a success or an error.

In AIR, ifIf there is no httpResponseStatus event listener, the behavior differs based on the SWFAIR version:

Parameters
request:URLRequest — A URLRequest object specifying the URL to download. If the value of this parameter or the URLRequest.url property of the URLRequest object passed are null, the application throws a null pointer error.

Events
complete:Event — Dispatched after data has loaded successfully. If there is a httpResponseStatus event listener, the URLRequest object also dispatches a complete event whether the HTTP response status code indicates a success or an error.
 
httpStatus:HTTPStatusEvent — If access is by HTTP and the current environment supports obtaining status codes, you may receive these events in addition to any complete or error event.
 
httpResponseStatus:HTTPStatusEvent — Dispatched if a call to the load() method attempts to access data over HTTP and Adobe AIR is able to detect and return the status code for the request.
 
ioError:IOErrorEvent — The load operation could not be completed.
 
open:Event — Dispatched when a load operation starts.
 
securityError:SecurityErrorEvent — A load operation attempted to retrieve data from a server outside the caller's security sandbox. This may be worked around using a policy file on the server.
 
certificateError:SecurityErrorEvent — A load operation attempted to retrieve data from a server with an invalid certificate (for example, self-signed or otherwise untrusted, or out of date).

Throws
ArgumentError URLRequest.requestHeader objects may not contain certain prohibited HTTP request headers. For more information, see the URLRequestHeader class description.
 
Error — This error can occur for the following reasons:
  1. Flash Player or Adobe AIR cannot convert the URLRequest.data parameter from UTF8 to MBCS. This error is applicable if the URLRequest object passed to load() is set to perform a GET operation and if System.useCodePage is set to true.
  2. Flash Player or Adobe AIR cannot allocate memory for the POST data. This error is applicable if the URLRequest object passed to load is set to perform a POST operation.
 
SecurityError — Local untrusted SWF files may not communicate with the Internet. This may be worked around by reclassifying this SWF file as local-with-networking or trusted.
 
SecurityError — You are trying to connect to a commonly reserved port. For a complete list of blocked ports, see "Restricting Networking APIs" in the ActionScript 3.0 Developer's Guide.
readBoolean()method 
public function readBoolean():Boolean

Language version: ActionScript 3.0
Runtime version: 

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

Returns
BooleanTrue is returned if the byte is nonzero, false otherwise.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readByte()method 
public function readByte():int

Language version: ActionScript 3.0
Runtime version: 

Reads a signed byte from the stream.

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

Returns
int — Value in the range -128...127.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readBytes()method 
public function readBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0):void

Language version: ActionScript 3.0
Runtime version: 

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
bytes:ByteArray — The ByteArray object to read data into.
 
offset:uint (default = 0) — The offset into bytes at which data read should begin. Defaults to 0.
 
length:uint (default = 0) — The number of bytes to read. The default value of 0 will cause all available data to be read.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readDouble()method 
public function readDouble():Number

Language version: ActionScript 3.0
Runtime version: 

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

Returns
Number — An IEEE 754 double-precision floating-point number from the stream.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readFloat()method 
public function readFloat():Number

Language version: ActionScript 3.0
Runtime version: 

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

Returns
Number — An IEEE 754 single-precision floating-point number from the stream.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readInt()method 
public function readInt():int

Language version: ActionScript 3.0
Runtime version: 

Reads a signed 32-bit integer from the stream.

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

Returns
int — Value in the range -2147483648...2147483647.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readMultiByte()method 
public function readMultiByte(length:uint, charSet:String):String

Language version: ActionScript 3.0
Runtime version: 

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

Parameters
length:uint — The number of bytes from the byte stream to read.
 
charSet:String — The string denoting the character set to use to interpret the bytes. Possible character set strings include "shift_jis", "CN-GB", "iso-8859-1", and others. For a complete list, see Supported Character Sets.

Note: If the value for the charSet parameter is not recognized by the current system, the application uses the system's default code page as the character set. For example, a value for the charSet parameter, as in myTest.readMultiByte(22, "iso-8859-01") that uses 01 instead of 1 might work on your development machine, but not on another machine. On the other machine, the application will use the system's default code page.

Returns
String — UTF-8 encoded string.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
readObject()method 
public function readObject():*

Language version: ActionScript 3.0
Runtime version: 

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

Returns
* — The deserialized object.

Throws
Error — There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception.
 
Error — An I/O error occurred on the stream, or the stream is not open.

See also

readShort()method 
public function readShort():int

Language version: ActionScript 3.0
Runtime version: 

Reads a signed 16-bit integer from the stream.

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

Returns
int — Value in the range -32768...32767.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readUnsignedByte()method 
public function readUnsignedByte():uint

Language version: ActionScript 3.0
Runtime version: 

Reads an unsigned byte from the stream.

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

Returns
uint — Value in the range 0...255.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readUnsignedInt()method 
public function readUnsignedInt():uint

Language version: ActionScript 3.0
Runtime version: 

Reads an unsigned 32-bit integer from the stream.

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

Returns
uint — Value in the range 0...4294967295.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readUnsignedShort()method 
public function readUnsignedShort():uint

Language version: ActionScript 3.0
Runtime version: 

Reads an unsigned 16-bit integer from the stream.

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

Returns
uint — Value in the range 0...65535.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readUTF()method 
public function readUTF():String

Language version: ActionScript 3.0
Runtime version: 

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

Returns
String — A UTF-8 string.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
readUTFBytes()method 
public function readUTFBytes(length:uint):String

Language version: ActionScript 3.0
Runtime version: 

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

Parameters
length:uint — A sequence of UTF-8 bytes.

Returns
String — A UTF-8 string produced by the byte representation of characters of specified length.

Throws
Error There is insufficient data available to read. If a local SWF file triggers a security warning, Flash Player prevents the URLStream data from being available to ActionScript. When this happens, the bytesAvailable property returns 0 even if data has been received, and any of the read methods throws an EOFError exception. This error applies to SWF content; it does not occur in JavaScript code running in AIR.
 
Error — An I/O error occurred on the stream, or the stream is not open.
Event detail
certificateErrorevent 
Event object type: flash.events.SecurityErrorEvent
SecurityErrorEvent.type property = flash.events.SecurityErrorEvent.CERTIFICATE_ERROR

Language version: ActionScript 3.0
Runtime version: AIR 51

Dispatched if a call to URLStream.load() attempts to load data from a server with an invalid certificate (for example, self-signed or untrusted, or with an invalid date). If a listener is added, any operating system standard behaviour will be ignored, instead the default action will be to close down the connection. To allow the default connection, you can call the preventDefault() function on the error object.

The SecurityErrorEvent.CERTIFICATE_ERROR constant is used when the runtime detects a problem with a server's security certificate. This event is then dispatched, giving the application the chance to handle this and determine whether to allow the connection or to block it (which is the default behaviour). To allow it, call preventDefault() on the error object. Note that not handling this error type will result in the default operating system behaviour - typically, a message will be displayed to the end user to allow them to choose the action.

This event has the following properties:

PropertyValue
bubblesfalse
cancelabletrue; default behavior is to close the connection, use preventDefault() to allow it.
currentTargetThe object that is actively processing the Event object with an event listener.
targetThe network object reporting the security error.
textText to be displayed as an error message.
completeevent  
Event object type: flash.events.Event
Event.type property = flash.events.Event.COMPLETE

Language version: ActionScript 3.0
Runtime version: 

Dispatched when data has loaded successfully.

The Event.COMPLETE constant defines the value of the type property of a complete event object.

This event has the following properties:

PropertyValue
bubblesfalse
cancelablefalse; there is no default behavior to cancel.
currentTargetThe object that is actively processing the Event object with an event listener.
targetThe network object that has completed loading.
httpResponseStatusevent  
Event object type: flash.events.HTTPStatusEvent
HTTPStatusEvent.type property = flash.events.HTTPStatusEvent.HTTP_RESPONSE_STATUS

Language version: ActionScript 3.0
Runtime version: AIR 1.0 AIR 1.0

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.

Unlike the httpStatus event, the httpResponseStatus event is delivered before any response data. Also, the httpResponseStatus event includes values for the responseHeaders and responseURL properties (which are undefined for an httpStatus event. Note that the httpResponseStatus event (if any) will be sent before (and in addition to) any complete or error event.

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

This event has the following properties:

PropertyValue
bubblesfalse
cancelablefalse; there is no default behavior to cancel.
currentTargetThe object that is actively processing the Event object with an event listener.
responseURLThe URL from which the response was returned.
responseHeadersThe response headers that the response returned, as an array of URLRequestHeader objects.
statusThe HTTP status code returned by the server.
redirectedWhether the reponse is the result of a redierct.
targetThe network object receiving an HTTP status code.

See also

httpStatusevent  
Event object type: flash.events.HTTPStatusEvent
HTTPStatusEvent.type property = flash.events.HTTPStatusEvent.HTTP_STATUS

Language version: ActionScript 3.0
Runtime version: 

Dispatched if a call to URLStream.load() attempts to access data over HTTP, and Flash Player 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.

The HTTPStatusEvent.HTTP_STATUS constant defines the value of the type property of a httpStatus event object.

This event has the following properties:

PropertyValue
bubblesfalse
cancelablefalse; there is no default behavior to cancel.
currentTargetThe object that is actively processing the Event object with an event listener.
statusThe HTTP status code returned by the server.
targetThe network object receiving an HTTP status code.

See also

ioErrorevent  
Event object type: flash.events.IOErrorEvent
IOErrorEvent.type property = flash.events.IOErrorEvent.IO_ERROR

Language version: ActionScript 3.0
Runtime version: 

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

Defines the value of the type property of an ioError event object.

This event has the following properties:

PropertyValue
bubblesfalse
cancelablefalse; there is no default behavior to cancel.
currentTargetThe object that is actively processing the Event object with an event listener.
errorIDA reference number associated with the specific error (AIR only).
targetThe network object experiencing the input/output error.
textText to be displayed as an error message.

See also

openevent  
Event object type: flash.events.Event
Event.type property = flash.events.Event.OPEN

Language version: ActionScript 3.0
Runtime version: 

Dispatched when a load operation starts.

The Event.OPEN constant defines the value of the type property of an open event object.

This event has the following properties:

PropertyValue
bubblesfalse
cancelablefalse; there is no default behavior to cancel.
currentTargetThe object that is actively processing the Event object with an event listener.
targetThe network object that has opened a connection.

See also

progressevent  
Event object type: flash.events.ProgressEvent
ProgressEvent.type property = flash.events.ProgressEvent.PROGRESS

Language version: ActionScript 3.0
Runtime version: 

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.

Defines the value of the type property of a progress event object.

This event has the following properties:

PropertyValue
bubblesfalse
bytesLoadedThe number of items or bytes loaded at the time the listener processes the event.
bytesTotalThe total number of items or bytes that ultimately will be loaded if the loading process succeeds.
cancelablefalse; there is no default behavior to cancel.
currentTargetThe object that is actively processing the Event object with an event listener.
targetThe object reporting progress.

See also

securityErrorevent  
Event object type: flash.events.SecurityErrorEvent
SecurityErrorEvent.type property = flash.events.SecurityErrorEvent.SECURITY_ERROR

Language version: ActionScript 3.0
Runtime version: 

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

The SecurityErrorEvent.SECURITY_ERROR constant defines the value of the type property of a securityError event object.

This event has the following properties:

PropertyValue
bubblesfalse
cancelablefalse; there is no default behavior to cancel.
currentTargetThe object that is actively processing the Event object with an event listener.
targetThe network object reporting the security error.
textText to be displayed as an error message.

See also

Examples
examples\URLStreamExample
The following example loads a SWF file and parses the beginning of its header to indicate compression and version number information.

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);
        }
    }
}