如何将两个16位整数（高位字/低位字）转换为32位浮点数？ [英] How To Convert Two 16bit Integer (High Word / Low Word) into 32bit Float?

问题描述

我有两个16位整数原始数据。

I have two 16bit integer raw data.

例如：

High Word = 17142（dec）或0100001011110110（binary）

Low Word = 59759（dec ）或1110100101111001（二进制）

For example:
High Word = 17142 (dec) or 0100001011110110 (binary)
Low Word = 59759 (dec) or 1110100101111001 (binary)

如果将两个单词一起视为一个32位浮点数据，它将为123.456

二进制 - > 01000010111101101110100101111001

If you treat two word together as one 32bit float data, it will be "123.456"
Binary --> 01000010111101101110100101111001

如何在Javascript中将整数数组[59759,17142]转换为浮点123.456？

How to convert integer array [59759 , 17142] to float 123.456 in Javascript?

注意：[ X（16位低位字），Y（16位高位字）] ==> Z（32位浮点数）

Note: [ X (16bit low word) , Y (16 bit high word) ] ==> Z (32bit float)

推荐答案

你可以使用类型化数组和 ArrayBuffer ，允许您以不同的方式解释相同的位（但字节顺序是特定于平台的）。也可以使用 DataView缓冲区上的 ，可以让你控制字节顺序。

You can do this with typed arrays and ArrayBuffer, which allow you to interpret the same bits in different ways (but endianness is platform-specific). It's also possible using a DataView on the buffer, which lets you conrol endianness.

这是类型化的数组方法，它与我的平台的字节顺序一致，看评论：

Here's the typed array approach which works with the endianness of my platform, see comments:

// Create a buffer
var buf = new ArrayBuffer(4);
// Create a 16-bit int view of it
var ints = new Uint16Array(buf);
// Fill in the values
ints[0] = 59759;
ints[1] = 17142;
// Create a 32-bit float view of it
var floats = new Float32Array(buf);
// Read the bits as a float; note that by doing this, we're implicitly
// converting it from a 32-bit float into JavaScript's native 64-bit double
var num = floats[0];
// Done
console.log(num);

这是 DataView 的方法，注意写作以相反顺序的整数：

Here's the DataView approach, note writing the ints in the opposite order:

// Create a buffer
var buf = new ArrayBuffer(4);
// Create a data view of it
var view = new DataView(buf);
// Write the ints to it
view.setUint16(0, 17142);
view.setUint16(2, 59759);
// Read the bits as a float; note that by doing this, we're implicitly
// converting it from a 32-bit float into JavaScript's native 64-bit double
var num = view.getFloat32(0);
// Done
console.log(num);

这篇关于如何将两个16位整数（高位字/低位字）转换为32位浮点数？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！