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ByteArray

Package | flash.utils
Class | public class ByteArray
Inheritance | ByteArray Object
Implements | IDataInput, IDataOutput

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

The ByteArray class provides methods and properties to optimize reading, writing, and working with binary data.

Note: The ByteArray class is for advanced ActionScript developers who need to access data on the byte level.

In-memory data is a packed array (the most compact representation for the data type) of bytes, but an instance of the ByteArray class can be manipulated with the standard ActionScript `[]` (array access) operators. It also can be read and written to as an in-memory file, using methods similar to those in the URLStream and Socket classes.

In addition, zlib compression and decompression are supported, as well as Action Message Format (AMF) object serialization.

Possible uses of the ByteArray class include the following:

- Creating a custom protocol to connect to a server.
- Writing your own URLEncoder/URLDecoder.
- Writing your own AMF/Remoting packet.
- Optimizing the size of your data by using data types.

View the examples

See also

[] (array access)
Socket class
URLStream class

Public Properties
Hide Inherited Public Properties
Show Inherited Public Properties

| Property | Defined By
--- | --- | ---
|  | bytesAvailable : uint [read-only] The number of bytes of data available for reading from the current position in the byte array to the end of the array. | ByteArray
|  | constructor : Object A reference to the class object or constructor function for a given object instance. | Object
|  | defaultObjectEncoding : uint [static] Denotes the default object encoding for the ByteArray class to use for a new ByteArray instance. | ByteArray
|  | endian : String Changes or reads the byte order for the data; either "bigEndian" or "littleEndian". | ByteArray
|  | length : uint The length of the ByteArray object, in bytes. | ByteArray
|  | objectEncoding : uint Used to determine whether the ActionScript 3.0, ActionScript 2.0, or ActionScript 1.0 format should be used when writing to, or reading from, a ByteArray instance. | ByteArray
|  | position : uint Moves, or returns the current position, in bytes, of the file pointer into the ByteArray object. | ByteArray
|  | prototype : Object [static] A reference to the prototype object of a class or function object. | Object

Public Methods
Hide Inherited Public Methods
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| Method | Defined By
--- | --- | ---
|  | ByteArray() Creates a ByteArray instance representing a packed array of bytes, so that you can use the methods and properties in this class to optimize your data storage and stream. | ByteArray
|  | clear():void Clears the contents of the byte array and resets the length and position properties to 0. | ByteArray
|  | compress():void Compresses the byte array using the zlib compressed data format. | ByteArray
|  | deflate():void Compresses the byte array using the DEFLATE compression algorithm. | ByteArray
|  | hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined. | Object
|  | inflate():void Decompresses the byte array. | ByteArray
|  | isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter. | Object
|  | propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable. | Object
|  | readBoolean():Boolean Reads a Boolean value from the byte stream. | ByteArray
|  | readByte():int Reads a signed byte from the byte stream. | ByteArray
|  | readBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0):void Reads the number of data bytes, specified by the length parameter, from the byte stream. | ByteArray
|  | readDouble():Number Reads an IEEE 754 double-precision (64-bit) floating-point number from the byte stream. | ByteArray
|  | readFloat():Number Reads an IEEE 754 single-precision (32-bit) floating-point number from the byte stream. | ByteArray
|  | readInt():int Reads a signed 32-bit integer from the byte stream. | ByteArray
|  | readMultiByte(length:uint, charSet:String):String Reads a multibyte string of specified length from the byte stream using the specified character set. | ByteArray
|  | readObject():* Reads an object from the byte array, encoded in AMF serialized format. | ByteArray
|  | readShort():int Reads a signed 16-bit integer from the byte stream. | ByteArray
|  | readUnsignedByte():uint Reads an unsigned byte from the byte stream. | ByteArray
|  | readUnsignedInt():uint Reads an unsigned 32-bit integer from the byte stream. | ByteArray
|  | readUnsignedShort():uint Reads an unsigned 16-bit integer from the byte stream. | ByteArray
|  | readUTF():String Reads a UTF-8 string from the byte stream. | ByteArray
|  | readUTFBytes(length:uint):String Reads a sequence of UTF-8 bytes specified by the length parameter from the byte stream and returns a string. | ByteArray
|  | setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations. | Object
|  | toString():String Converts the byte array to a string. | ByteArray
|  | uncompress():void Decompresses the byte array. | ByteArray
|  | valueOf():Object Returns the primitive value of the specified object. | Object
|  | writeBoolean(value:Boolean):void Writes a Boolean value. | ByteArray
|  | writeByte(value:int):void Writes a byte to the byte stream. | ByteArray
|  | writeBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0):void Writes a sequence of length bytes from the specified byte array, bytes, starting offset (zero-based index) bytes into the byte stream. | ByteArray
|  | writeDouble(value:Number):void Writes an IEEE 754 double-precision (64-bit) floating-point number to the byte stream. | ByteArray
|  | writeFloat(value:Number):void Writes an IEEE 754 single-precision (32-bit) floating-point number to the byte stream. | ByteArray
|  | writeInt(value:int):void Writes a 32-bit signed integer to the byte stream. | ByteArray
|  | writeMultiByte(value:String, charSet:String):void Writes a multibyte string to the byte stream using the specified character set. | ByteArray
|  | writeObject(object:*):void Writes an object into the byte array in AMF serialized format. | ByteArray
|  | writeShort(value:int):void Writes a 16-bit integer to the byte stream. | ByteArray
|  | writeUnsignedInt(value:uint):void Writes a 32-bit unsigned integer to the byte stream. | ByteArray
|  | writeUTF(value:String):void Writes a UTF-8 string to the byte stream. | ByteArray
|  | writeUTFBytes(value:String):void Writes a UTF-8 string to the byte stream. | ByteArray

Property Detail

bytesAvailable | property

`bytesAvailable:uint` [read-only]

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

The number of bytes of data available for reading from the current position in the byte array to the end of the array.

Use the `bytesAvailable` property in conjunction with the read methods each time you access a ByteArray object to ensure that you are reading valid data.

Implementation
`public function get bytesAvailable():uint`

defaultObjectEncoding | property |

`defaultObjectEncoding:uint` [read-write]

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Denotes the default object encoding for the ByteArray class to use for a new ByteArray instance. When you create a new ByteArray instance, the encoding on that instance starts with the value of `defaultObjectEncoding`. The `defaultObjectEncoding` property is initialized to `ObjectEncoding.AMF3`.

When an object is written to or read from binary data, the `objectEncoding` value is used to determine whether the ActionScript 3.0, ActionScript2.0, or ActionScript 1.0 format should be used. The value is a constant from the ObjectEncoding class.

Implementation
`public static function get defaultObjectEncoding():uint`
`public function set defaultObjectEncoding(value:uint):void`

See also

ObjectEncoding class
flash.utils.ByteArray.objectEncoding

endian | property |

`endian:String` [read-write]

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Changes or reads the byte order for the data; either "bigEndian" or "littleEndian". The values are constants from the Endian class.

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

See also

Endian class

length | property |

`length:uint` [read-write]

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

The length of the ByteArray object, in bytes.

If the length is set to a value that is larger than the current length, Flash Player fills the right side with zeros.

If the length is set to a value that is smaller than the current length, the array is truncated.

Implementation
`public function get length():uint`
`public function set length(value:uint):void`

objectEncoding | property |

`objectEncoding:uint` [read-write]

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Used to determine whether the ActionScript 3.0, ActionScript 2.0, or ActionScript 1.0 format should be used when writing to, or reading from, a ByteArray instance. The value is a constant from the ObjectEncoding class.

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

See also

ObjectEncoding class
flash.utils.ByteArray.defaultObjectEncoding

position | property |

`position:uint` [read-write]

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Moves, or returns the current position, in bytes, of the file pointer into the ByteArray object. This is the point at which the next call to a read method starts reading or a write method starts writing.

Implementation
`public function get position():uint`
`public function set position(value:uint):void`
Constructor Detail

ByteArray | () | Constructor

`public function ByteArray()`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Creates a ByteArray instance representing a packed array of bytes, so that you can use the methods and properties in this class to optimize your data storage and stream.

Method Detail

clear | () | method

`flash10 function clear():void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 10

Clears the contents of the byte array and resets the `length` and `position` properties to 0. Calling this method explicitly frees up the memory used by the ByteArray instance.

compress | () | method |

`public function compress():void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Compresses the byte array using the zlib compressed data format. The entire byte array is compressed.

After the call, the `length` property of the ByteArray is set to the new length. The `position` property is set to the end of the byte array.

The zlib compressed data format is described at http://www.ietf.org/rfc/rfc1950.txt.

See also

flash.utils.ByteArray.uncompress()
flash.utils.ByteArray.deflate()

deflate | () | method |

`flash10 function deflate():void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 10

Compresses the byte array using the DEFLATE compression algorithm. The entire byte array is compressed.

After the call, the `length` property of the ByteArray is set to the new length. The `position` property is set to the end of the byte array.

The DEFLATE compression algorithm is described at http://www.ietf.org/rfc/rfc1951.txt.

The DEFLATE compression algorithm is used in several compression formats, such as zlib, gzip, some zip implementations, and others. When data is compressed using one of those compression formats, in addition to storing the compressed version of the original data, the compression format data (for example, the .zip file) includes metadata information. Some examples of the types of metadata included in various file formats are file name, file modification date/time, original file size, optional comments, checksum data, and more.

For example, when a ByteArray is compressed using the `compress()` method, the ByteArray is compressed using the zlib compressed data format. The resulting ByteArray is structured in a specific format. Certain bytes contain metadata about the compressed data, while other bytes contain the actual compressed version of the original ByteArray data. As defined by the zlib compressed data format specification, those bytes (that is, the portion containing the compressed version of the original data) are compressed using the DEFLATE algorithm. Consequently those bytes are identical to the result of calling `deflate()` on the original ByteArray. However, the `compress()` result includes the extra metadata, while the `deflate()` result includes only the compressed version of the original ByteArray data and nothing else.

Consequently, in order to use `deflate()` to compress a ByteArray instance's data in a specific format such as gzip or zip, you can't just call the instance's `deflate()` method. You must create a ByteArray structured according to the compression format's specification, including the appropriate metadata as well as the compressed data obtained using the `deflate()` method. Likewise, in order to decode data compressed in a format such as gzip or zip, you can't simply use the `inflate()` method on that data. First you must separate the metadata from the compressed data, and you can then use the `inflate()` method to decompress the compressed data.

See also

flash.utils.ByteArray.inflate()

inflate | () | method |

`flash10 function inflate():void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 10

Decompresses the byte array. The byte array must have been previously compressed with the DEFLATE compression algorithm, as is used by the `deflate()` method.

After the call, the `length` property of the ByteArray is set to the new length. The `position` property is set to 0.

The DEFLATE compression algorithm is described at http://www.ietf.org/rfc/rfc1951.txt.

In order to decode data compressed in a format that uses the DEFLATE compression algorithm, such as data in gzip or zip format, it will not work to call the `inflate()` method on a ByteArray containing the compression formation data. First you must separate the metadata that is included as part of the compressed data format from the actual compressed data. For more information, see the `deflate()` method description.

Throws

| `IOError` — The data is not valid compressed data; it was not compressed with the DEFLATE compression algorithm.

See also

flash.utils.ByteArray.deflate()

readBoolean | () | method |

`public function readBoolean():Boolean`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

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

Returns

| `Boolean` — Returns `true` if the byte is nonzero, `false` otherwise.

Throws

| `EOFError` — There is not sufficient data available to read.

readByte | () | method |

`public function readByte():int`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads a signed byte from the byte stream.

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

Returns

| `int` — An integer between -128 and 127.

Throws

| `EOFError` — There is not sufficient data available to read.

readBytes | () | method |

`public function readBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads the number of data bytes, specified by the `length` parameter, from the byte stream. The bytes are read into the ByteArray object specified by the `bytes` parameter, and the bytes are written into the destination ByteArray starting at the position specified by `offset`.

Parameters

| `bytes:ByteArray` — The ByteArray object to read data into.
| `offset:uint` (default = `0`)`` — The offset (position) in `bytes` at which the read data should be written.
| `length:uint` (default = `0`)`` — The number of bytes to read. The default value of 0 causes all available data to be read.

Throws

| `EOFError` — There is not sufficient data available to read.

readDouble | () | method |

`public function readDouble():Number`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads an IEEE 754 double-precision (64-bit) floating-point number from the byte stream.

Returns

| `Number` — A double-precision (64-bit) floating-point number.

Throws

| `EOFError` — There is not sufficient data available to read.

readFloat | () | method |

`public function readFloat():Number`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads an IEEE 754 single-precision (32-bit) floating-point number from the byte stream.

Returns

| `Number` — A single-precision (32-bit) floating-point number.

Throws

| `EOFError` — There is not sufficient data available to read.

readInt | () | method |

`public function readInt():int`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads a signed 32-bit integer from the byte stream.

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

Returns

| `int` — A 32-bit signed integer between -2147483648 and 2147483647.

Throws

| `EOFError` — There is not sufficient data available to read.

readMultiByte | () | method |

`public function readMultiByte(length:uint, charSet:String):String`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

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, then Flash Player 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, Flash Player will use the system's default code page.

Returns

| `String` — UTF-8 encoded string.

Throws

| `EOFError` — There is not sufficient data available to read.

readObject | () | method |

`public function readObject():*`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads an object from the byte array, encoded in AMF serialized format.

Returns

| `*` — The deserialized object.

Throws

| `EOFError` — There is not sufficient data available to read.

readShort | () | method |

`public function readShort():int`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads a signed 16-bit integer from the byte stream.

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

Returns

| `int` — A 16-bit signed integer between -32768 and 32767.

Throws

| `EOFError` — There is not sufficient data available to read.

readUnsignedByte | () | method |

`public function readUnsignedByte():uint`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads an unsigned byte from the byte stream.

The returned value is in the range 0 to 255.

Returns

| `uint` — A 32-bit unsigned integer between 0 and 255.

Throws

| `EOFError` — There is not sufficient data available to read.

readUnsignedInt | () | method |

`public function readUnsignedInt():uint`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads an unsigned 32-bit integer from the byte stream.

The returned value is in the range 0 to 4294967295.

Returns

| `uint` — A 32-bit unsigned integer between 0 and 4294967295.

Throws

| `EOFError` — There is not sufficient data available to read.

readUnsignedShort | () | method |

`public function readUnsignedShort():uint`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads an unsigned 16-bit integer from the byte stream.

The returned value is in the range 0 to 65535.

Returns

| `uint` — A 16-bit unsigned integer between 0 and 65535.

Throws

| `EOFError` — There is not sufficient data available to read.

readUTF | () | method |

`public function readUTF():String`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

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

Returns

| `String` — UTF-8 encoded string.

Throws

| `EOFError` — There is not sufficient data available to read.

See also

flash.utils.IDataInput.readUTF()

readUTFBytes | () | method |

`public function readUTFBytes(length:uint):String`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Reads a sequence of UTF-8 bytes specified by the `length` parameter from the byte stream and returns a string.

Parameters

| `length:uint` — An unsigned short indicating the length of the UTF-8 bytes.

Returns

| `String` — A string composed of the UTF-8 bytes of the specified length.

Throws

| `EOFError` — There is not sufficient data available to read.

toString | () | method |

`public function toString():String`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Converts the byte array to a string. If the data in the array begins with a Unicode byte order mark, Flash will honor that mark when converting to a string. If `System.useCodePage` is set to `true`, the player will treat the data in the array as being in the current system code page when converting.

Returns

| `String` — The string representation of the byte array.

uncompress | () | method |

`public function uncompress():void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Decompresses the byte array. The byte array must have been compressed using the zlib compressed data format.

After the call, the `length` property of the ByteArray is set to the new length. The `position` property is set to 0.

The zlib compressed data format is described at http://www.ietf.org/rfc/rfc1950.txt.

See also

flash.utils.ByteArray.compress()
flash.utils.ByteArray.inflate()

writeBoolean | () | method |

`public function writeBoolean(value:Boolean):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a Boolean value. A single byte is written according to the `value` parameter, either 1 if `true` or 0 if `false`.

Parameters

| `value:Boolean` — A Boolean value determining which byte is written. If the parameter is `true`, Flash Player writes a 1; if `false`, Flash Player writes a 0.

writeByte | () | method |

`public function writeByte(value:int):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a byte to the byte stream.

The low 8 bits of the parameter are used. The high 24 bits are ignored.

Parameters

| `value:int` — A 32-bit integer. The low 8 bits are written to the byte stream.

writeBytes | () | method |

`public function writeBytes(bytes:ByteArray, offset:uint = 0, length:uint = 0):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a sequence of `length` bytes from the specified byte array, `bytes`, starting `offset` (zero-based index) bytes into the byte stream.

If the `length` parameter is omitted, the default length of 0 is used; Flash Player writes the entire buffer starting at `offset`. If the `offset` parameter is also omitted, the entire buffer is written.

If `offset` or `length` is out of range, they are clamped to the beginning and end of the `bytes` array.

Parameters

| `bytes:ByteArray` — The ByteArray object.
| `offset:uint` (default = `0`)`` — A zero-based index indicating the position into the array to begin writing.
| `length:uint` (default = `0`)`` — An unsigned integer indicating how far into the buffer to write.

writeDouble | () | method |

`public function writeDouble(value:Number):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes an IEEE 754 double-precision (64-bit) floating-point number to the byte stream.

Parameters

| `value:Number` — A double-precision (64-bit) floating-point number.

writeFloat | () | method |

`public function writeFloat(value:Number):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes an IEEE 754 single-precision (32-bit) floating-point number to the byte stream.

Parameters

| `value:Number` — A single-precision (32-bit) floating-point number.

writeInt | () | method |

`public function writeInt(value:int):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a 32-bit signed integer to the byte stream.

Parameters

| `value:int` — An integer to write to the byte stream.

writeMultiByte | () | method |

`public function writeMultiByte(value:String, charSet:String):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a multibyte string to the byte stream using the specified character set.

Parameters

| `value:String` — The string value to be written.
| `charSet:String` — The string denoting the character set to use. Possible character set strings include `"shift-jis"`, `"cn-gb"`, `"iso-8859-1"`, and others. For a complete list, see Supported Character Sets.

writeObject | () | method |

`public function writeObject(object:*):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes an object into the byte array in AMF serialized format.

Parameters

| `object:*` — The object to serialize.

writeShort | () | method |

`public function writeShort(value:int):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a 16-bit integer to the byte stream. The low 16 bits of the parameter are used. The high 16 bits are ignored.

Parameters

| `value:int` — 32-bit integer, whose low 16 bits are written to the byte stream.

writeUnsignedInt | () | method |

`public function writeUnsignedInt(value:uint):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a 32-bit unsigned integer to the byte stream.

Parameters

| `value:uint` — An unsigned integer to write to the byte stream.

writeUTF | () | method |

`public function writeUTF(value:String):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a UTF-8 string to the byte stream. The length of the UTF-8 string in bytes is written first, as a 16-bit integer, followed by the bytes representing the characters of the string.

Parameters

| `value:String` — The string value to be written.

Throws

| `RangeError` — If the length is larger than 65535.

writeUTFBytes | () | method |

`public function writeUTFBytes(value:String):void`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Writes a UTF-8 string to the byte stream. Similar to the `writeUTF()` method, but `writeUTFBytes()` does not prefix the string with a 16-bit length word.

Parameters

| `value:String` — The string value to be written.

Examples How to use examples
ByteArrayExample.as
The following example uses the class `ByteArrayExample` to write a Boolean and the double-precision floating-point representation of pi to a byte array. This is accomplished using the following steps:

1. Declare a new ByteArray object instance `byteArr`.
2. Write the byte-equivalent value of the Boolean `false` and then check the length and read it back.
3. Write the double-precision floating-point equivalent of the mathematical value of pi.
4. Read back each of the nine bytes written into the byte array.

Note: when `trace()` is called on a byte, it prints the decimal equivalent of the bytes stored in the byte array.

Notice how a code segment is added at the end to check for end of file errors to ensure that the byte stream is not read past its end.

    package {
        import flash.display.Sprite;
        import flash.utils.ByteArray;
        import flash.errors.EOFError;

        public class ByteArrayExample extends Sprite {
            public function ByteArrayExample() {
                var byteArr:ByteArray = new ByteArray();

                byteArr.writeBoolean(false);
                trace(byteArr.length);            // 1
                trace(byteArr[0]);            // 0

                byteArr.writeDouble(Math.PI);
                trace(byteArr.length);            // 9
                trace(byteArr[0]);            // 0
                trace(byteArr[1]);            // 64
                trace(byteArr[2]);            // 9
                trace(byteArr[3]);            // 33
                trace(byteArr[4]);            // 251
                trace(byteArr[5]);            // 84
                trace(byteArr[6]);            // 68
                trace(byteArr[7]);            // 45
                trace(byteArr[8]);            // 24

                byteArr.position = 0;

                try {
                    trace(byteArr.readBoolean() == false); // true
                }
                catch(e:EOFError) {
                    trace(e);           // EOFError: Error #2030: End of file was encountered.
                }

                try {
                    trace(byteArr.readDouble());        // 3.141592653589793
                }
                catch(e:EOFError) {
                    trace(e);           // EOFError: Error #2030: End of file was encountered.
                }

                try {
                    trace(byteArr.readDouble());
                }
                catch(e:EOFError) {
                    trace(e);            // EOFError: Error #2030: End of file was encountered.
                }
            }
        }
    }

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