Uint8Array

Summary

A typed array of 8-bit unsigned integer values. The contents are initialized to 0. If the requested number of bytes could not be allocated an exception is raised.

Syntax

uint8Array = new Uint8Array( length );

uintArray = new Uint8Array( array );

uintArray = new Uint8Array( buffer , byteOffset , length );

uint8Array

Required. The variable name to which the Uint8Array object is assigned.

length

Specifies the length (in bytes) of the array.

array

The array (or typed array) that is contained in this array. The contents are initialized to the contents of the given array or typed array, with each element converted to the Uint8 type.

buffer

The ArrayBuffer that the Uint8Array represents.

byteOffset

Optional. Specifies the offset in bytes from the start of the buffer at which the Uint8Array should begin.

length

The length of the array.

Examples

The following example shows how to use a Uint8Array object to process the binary data acquired from an XmlHttpRequest:

var req = new XMLHttpRequest();
     req.open('GET', "http://www.example.com");
     req.responseType = "arraybuffer";
     req.send();

     req.onreadystatechange = function () {
         if (req.readyState === 4) {
             var buffer = req.response;
             var dataview = new DataView(buffer);
             var ints = new Uint8Array(buffer.byteLength);
             for (var i = 0; i < ints.length; i++) {
                 ints[i] = dataview.getUint8(i);
             }
         alert(ints[10]);
         }
     }

Constants

The following table lists the constants of the Uint8Array object.

Properties

The following table lists the constants of the Uint8Array object.

Methods

The following table lists the methods of the Uint8Array object.

Attributions

• Microsoft Developer Network: Article