arraybuffer

Does somebody know a script that is able to convert a string to a ArrayBuffer using unicode encoding? I´m creating a browser-side eqivalent of the "Buffer" of node.js. The only encoding that is left is unicode. All others are done. Thanks for your help! I found it out by myself. Decoding: var b = new Uint8Array(str.length*2); for(var i = 0; i < b.length; i+=2){ var x = str.charCodeAt(i/2); var a = x%256; x -= a; x /= 256; b[i] = x; b[i+1] = a; } Encoding var s = ""; for(var i = 0; i < this.length;){ s += String.fromCharCode(this[i++]*256+this[i++]); } 来源： https://stackoverflow.com/questions

1. 可变容器通用方法（Common operators (methods) on mutable collections） c += x：把x元素添加到集合c中 scala> val a = collection.mutable.ArrayBuffer(1,2,3) a: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(1, 2, 3) scala> a += 4 res15: a.type = ArrayBuffer(1, 2, 3, 4) c += (x,y,z)：把x，y，z添加到集合c中 scala> val a = collection.mutable.ArrayBuffer(1,2,3) a: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(1, 2, 3) scala> a += (4,5,6) res16: a.type = ArrayBuffer(1, 2, 3, 4, 5, 6) c1 ++= c2：把集合c2的元素全部添加到集合c1中 scala> val c1 = mutable.ArrayBuffer(1,2,3) c1: scala.collection.mutable.ArrayBuffer[Int] =

Requested Knowledge How to shorten (from the front) an array of audio blobs and still have playable audio. Goal I am ultimately trying to record a continuous 45 second loop of audio using the JS MediaRecorder API. The user will be able to push a button and the last 45s of audio will be saved. I can record, playback, and download a single recording just fine. Issue When I have an array called chunks of say 1000 blobs from the MediaRecorder and use chunks.slice(500, 1000) the resulting blob array can't be used to playback or download audio. Oddly enough chunks.slice(0,500) still works fine. Code

I have a node.js server application and a browser client. Sending ArrayBuffer data browser -> server works perfectly, but server -> browser results in a string "[object ArrayBuffer]" being received. This happens in the latest versions of both Chrome and Firefox. Server: var serverPort = 9867; // dependencies var webSocketServer = require('websocket').server; var http = require('http'); var players = {}; var nextPlayerId = 0; // create http server var server = http.createServer(function(request, response) { }); server.listen(serverPort, function() { console.log((new Date()) + " Server is

It seems so simple, but I cannot find out how to convert an Array filled with integers to an ArrayBuffer and back again to an Array . There are lots of examples where strings are converted to an ArrayBuffer like for example here . Using these examples I created this: /** * Convert string to array buffer. * * @param {Array.<int>} array * @returns {ArrayBuffer} */ self.arrayToArrayBuffer = function( array ) { var length = array.length; var buffer = new ArrayBuffer( length * 2 ); var view = new Uint16Array(buffer); for ( var i = 0; i < length; i++) { view[i] = array[i]; } return buffer; } Then

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I need an efficient (read native) way to convert an ArrayBuffer to a base64 string which needs to be used on a multipart post. 回答1: function _arrayBufferToBase64 ( buffer ) { var binary = '' ; var bytes = new Uint8Array ( buffer ); var len = bytes . byteLength ; for ( var i = 0 ; i but, non-native implementations are faster e.g. https://gist.github.com/958841 see http://jsperf.com/encoding-xhr-image-data/6 回答2: This works fine for me: var base64String = btoa ( String . fromCharCode . apply ( null , new Uint8Array ( arrayBuffer )));