十六进制字符串到INT32-Little Endian(DCBA格式)Javascript [英] Hex String to INT32 - Little Endian (DCBA Format) Javascript

问题描述

根据可悲的文档实施某些操作，而没有任何信息.

Implementing something based on a pathetic documentation without no info nothing.

示例就是这样

(7F02AAF7)H => (F7AA027F)H = -139853185

说，即使我将 7F02AAF7 转换为 F7AA027F ，那么通过'parseInt('F7AA027F'，16)'与我期望的不同.

Let's say even if I convert 7F02AAF7 to F7AA027F, then still the output via 'parseInt('F7AA027F', 16)' is different from what I am expecting.

我做了一些Google搜索，发现了该网站 http://www.scadacore.com/field-tools/programming-calculators/online-hex-converter/

I did some google search and found this website http://www.scadacore.com/field-tools/programming-calculators/online-hex-converter/

在这里，当您输入 7F02AAF7 时，它将在 INT32-Little Endian(DCBA)系统下被处理为所需编号.我尝试了这个搜索字词，但没有运气.您能告诉我我到底应该在这里做什么，是否有任何node.js库可以帮助我解决这个问题.

Here when you input 7F02AAF7 then it is processed to wanted number under INT32 - Little Endian (DCBA) system. I tried this search term but no luck. Can you please tell me what exactly am I supposed to do here and is there any node.js library which can help me with this.

推荐答案

您可以采用 的出色答案href ="https://stackoverflow.com/users/157247/tj-crowder"> TJCrowder 并使用 给定字节的DataView#setUint8 与 DataView#getInt32 和littleEndian的指示器.

You could adapt the excellent answer of T.J. Crowder and use DataView#setUint8 for the given bytes with DataView#getInt32 and an indicator for littleEndian.

var data = '7F02AAF7'.match(/../g);

// Create a buffer
var buf = new ArrayBuffer(4);
// Create a data view of it
var view = new DataView(buf);

// set bytes
data.forEach(function (b, i) {
    view.setUint8(i, parseInt(b, 16));
});

// get an int32 with little endian
var num = view.getInt32(0, 1);
console.log(num);

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