在JavaScript中将float转换为32位十六进制字符串 [英] Convert float to 32bit hex string in JavaScript

问题描述

我有一个代表gps坐标的浮点值，我喜欢将它转换为一个32位的十六进制字符串。

我试过每个解决方案 $ b
$ b

例如，大部分'ToHex'函数：

  var lat = 45.839152; 
 console.log（ToHex（lat））; 
  

返回我'2d.56d0b30b5aa8'

但我预计'42355b43'的结果为大多数转换器返回

你知道我如何在JavaScript中获得'42355b43'吗？

谢谢！

解决方案

您可以将 TypedArray 对象与 ArrayBuffer 和 DataView 。然后将值设置为float 32并将视图读为无符号整数8位数据。

const getHex = i => （'00'+ i.toString（16））。slice（-2）; var view = new DataView（new ArrayBuffer（4）），result; view.setFloat32（0，45.839152）; result = Array .apply（null ，（长度：4））.map（（_，i）=> getHex（view.getUint8（i）））.join（''）; console.log（result）; / pre>

I have a float value representing gps coordinates and I liked to convert it to a 32bit hex string.

I tried every solution described here but everytime, the result is not what I am expecting.

For example, most of the 'ToHex' functions :

var lat = 45.839152;
console.log(ToHex(lat));

returns me '2d.56d0b30b5aa8'

but I am expecting '42355b43' for result as most converters returns

do you know how I could get '42355b43' as a result in JavaScript ?

Thank you !

解决方案

You could take the TypedArray object with an ArrayBuffer and DataView.

Then set the value as float 32 and read the view as unsigned integer 8 bit for the values.

const getHex = i => ('00' + i.toString(16)).slice(-2);

var view = new DataView(new ArrayBuffer(4)),
    result;

view.setFloat32(0, 45.839152);

result = Array
    .apply(null, { length: 4 })
    .map((_, i) => getHex(view.getUint8(i)))
    .join('');

console.log(result);

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