如何在 Javascript 中将二进制数据读取到字节数组？
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How do I read binary data to a byte array in Javascript?
提问by Zeeno
I want to read a binary file in JavaScript that would be gotten through XMLHttpRequest and be able to manipulate that data. From my researching I discovered this method of reading a binary file data into an array
我想在 JavaScript 中读取一个二进制文件，该文件将通过 XMLHttpRequest 获取并能够操作该数据。从我的研究中，我发现了这种将二进制文件数据读入数组的方法
var xhr = new XMLHttpRequest();
xhr.open('GET', '/binary_And_Ascii_File.obj', true);
xhr.responseType = 'arraybuffer';
xhr.onload = function(e) {
var uInt8Array = new Uint8Array(this.response);
};
How do I convert this binary data array to a human-readable-string?
如何将此二进制数据数组转换为人类可读的字符串？
采纳答案by user278064
I'm sure you will find this helpful: http://jsdo.it/tsmallfield/uint8array.
我相信你会发现这很有帮助：http: //jsdo.it/tsmallfield/uint8array。
Click on javascripttab.
There will appear the code to convert the Uint8Array in a string. The author shows 2 method:
单击javascript选项卡。将出现将 Uint8Array 转换为字符串的代码。作者展示了2种方法：
- The first is about creating a view.
- The second offsetting bytes.
- 第一个是关于创建视图。
- 第二个偏移字节。
EDIT:report the code for completeness
编辑：报告代码的完整性
var buffer = new ArrayBuffer( res.length ), // res is this.response in your case
view = new Uint8Array( buffer ),
len = view.length,
fromCharCode = String.fromCharCode,
i, s, str;
/**
* 1) 8bitの配列に入れて上位ビットけずる
*/
str = "";
for ( i = len; i--; ) {
view[i] = res[i].charCodeAt(0);
}
for ( i = 0; i < len; ++i ) {
str += fromCharCode( view[i] );
}
/**
* 2) & 0xff で上位ビットけずる
*/
str = "";
for ( i = 0; i < len; ++i ) {
str += fromCharCode( res[i].charCodeAt(0) & 0xff );
}
回答by Phyxx
function load_binary_resource(url) {
var byteArray = [];
var req = new XMLHttpRequest();
req.open('GET', url, false);
req.overrideMimeType('text\/plain; charset=x-user-defined');
req.send(null);
if (req.status != 200) return byteArray;
for (var i = 0; i < req.responseText.length; ++i) {
byteArray.push(req.responseText.charCodeAt(i) & 0xff)
}
return byteArray;
}
See https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Sending_and_Receiving_Binary_Datafor more details
有关更多详细信息，请参阅https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Sending_and_Receiving_Binary_Data
