如何转换UINT8数组为Base64恩codeD字符串？ [英] How to convert uint8 Array to base64 Encoded String?

问题描述

我得到了一个WebSocket的交际，我收到的base64 EN codeD字符串，将其转换为UINT8和工作就可以了，但现在我需要送回去，我得到了UINT8数组，需要将其转换为Base64字符串，这样我就可以把它。
我怎样才能让这个皈依？

I got a webSocket comunication, I recieve base64 encoded string, convert it to uint8 and work on it, but now I need to send back, I got the uint8 array, and need to convert it to base64 string, so I can send it. How can I make this convertion?

推荐答案

为Base64 EN code一Uint8Array：

To base64 encode a Uint8Array:

var u8 = new Uint8Array([65, 66, 67, 68]);
var b64encoded = btoa(String.fromCharCode.apply(null, u8));

和脱code中的字符串的base64回到一个Uint8Array：

And to decode the base64 string back to a Uint8Array:

var u8_2 = new Uint8Array(atob(b64encoded).split("").map(function(c) {
    return c.charCodeAt(0); }));

更新

的Mozilla最近发布的包含在类型化数组一个 StringView 处理字符串。具体请查看bytesToBase64方法可能是你想要的。

Mozilla recently released a StringView for manipulating strings contained in Typed Arrays. Specifically the bytesToBase64 method is probably what you want.

如果这是太重的重量，那么这里是一个简单的程序（基于一个张贴@RohitSengar），一个Uint8Array转换为字符串（然后可以很容易地采用base64 EN codeD）：

If that's too heavy weight, then here is a simple routine (based on the one posted by @RohitSengar) that converts a Uint8Array to a string (which can then be easily base64 encoded):

function Uint8ToString(u8a){
  var CHUNK_SZ = 0x8000;
  var c = [];
  for (var i=0; i < u8a.length; i+=CHUNK_SZ) {
    c.push(String.fromCharCode.apply(null, u8a.subarray(i, i+CHUNK_SZ)));
  }
  return c.join("");
}
// Usage
var u8 = new Uint8Array([65, 66, 67, 68]);
var b64encoded = btoa(Uint8ToString(u8));

这篇关于如何转换UINT8数组为Base64恩codeD字符串？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！