转换32位无符号“真实”数据类型（分成两个16位有符号的单词）到JavaScript

问题描述

我有一个32位无符号的实数值分成两个16位有符号的字（0-65535）值。例如：
Value1：18584
Value2：18081
实际值是：如何将它们转换为一个javascript数字？

20644.3

我正在寻找像back2Real（18584，18081）这样的函数，它返回20644.3。这些值来自modbus应用程序（NodeJS / modbus_stack）。 SPS / modbus服务器发送一个Real值分成两个字寄存器。

问候，
root66

  function uint16ToFloat32（low，high）{
 var buffer = new ArrayBuffer（4）; 
 var intView = new Uint16Array（buffer）; 
 var floatView = new Float32Array（buffer）; 
 
 intView [0] =低; 
 intView [1] = high; 
返回floatView [0]; 
 
 
函数float32ToUint16（value）{
 var buffer = new ArrayBuffer（4）; 
 var intView = new Uint16Array（buffer）; 
 var floatView = new Float32Array（buffer）; 
 
 floatView [0] = value; 
 return [intView [0]，intView [1]]; 
 
 
 console.log（Converted ints to，uint16ToFloat32（18584，18081））; 
 console.log（Converted float to，float32ToUint16（20644.297））; 
  

这是一个记录：

  $ node floatsplit.js 
已转换的整数为20644.296875 
将浮动转换为[18584，18081] 
 $ 
  

i've got a 32 bit unsigned "Real" value splitted into two 16 Bit signed "Word" (0-65535) values. How do I convert them to a javascript number?

Example:Value1: 18584Value2: 18081The Real value is: 20644.3

I'm searching for a function like back2Real(18584, 18081) which returns 20644.3. The values come from a modbus application (NodeJS / modbus_stack). The SPS/modbus server sends a "Real" value splitted into two Word-registers.

Regards,root66

解决方案

You can use the new(ish) typed array functionality to simplify this.

function uint16ToFloat32(low, high) {
  var buffer = new ArrayBuffer(4);
  var intView = new Uint16Array(buffer);
  var floatView = new Float32Array(buffer);

  intView[0] = low;
  intView[1] = high;
  return floatView[0];
}

function float32ToUint16(value) {
  var buffer = new ArrayBuffer(4);
  var intView = new Uint16Array(buffer);
  var floatView = new Float32Array(buffer);

  floatView[0] = value;
  return [intView[0], intView[1]];
}

console.log("Converted ints to", uint16ToFloat32(18584, 18081));
console.log("Converted float to", float32ToUint16(20644.297));

Here's a transcript:

$ node floatsplit.js
Converted ints to 20644.296875
Converted float to [ 18584, 18081 ]
$

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