将浮点数转换为 dart 中的 modbus 寄存器

Question

有人帮忙将此方法转换为 Dart 代码吗？我需要将浮点数转换为 Modbus 寄存器。我有这个easymodbus的方法class:

public static int[] ConvertFloatToRegisters(float floatValue)
    {
        byte[] floatBytes = BitConverter.GetBytes(floatValue);
        byte[] highRegisterBytes = 
        {
            floatBytes[2],
            floatBytes[3],
            0,
            0
        };
        byte[] lowRegisterBytes = 
        {
            
            floatBytes[0],
            floatBytes[1],
            0,
            0
        };
        int[] returnValue =
        {
            BitConverter.ToInt32(lowRegisterBytes,0),
            BitConverter.ToInt32(highRegisterBytes,0)
        };
        return returnValue;
    }

Answer 1

此代码应与您的 C# 示例执行相同的操作，但在 Dart 中：

import 'dart:typed_data';

void main() {
  print(convertFloatToRegisters(43554.975)); // [8954, 18218]
}

Int32List convertFloatToRegisters(double floatValue) {
  final floatBytes = ByteData(4)..setFloat32(0, floatValue, Endian.little);

  final highRegisterBytes = ByteData(4)
    ..setUint8(0, floatBytes.getUint8(2))
    ..setUint8(1, floatBytes.getUint8(3));

  final lowRegisterBytes = ByteData(4)
    ..setUint8(0, floatBytes.getUint8(0))
    ..setUint8(1, floatBytes.getUint8(1));

  final returnValue = Int32List(2);
  returnValue[0] = lowRegisterBytes.getInt32(0, Endian.little);
  returnValue[1] = highRegisterBytes.getInt32(0, Endian.little);

  return returnValue;
}

根据代码的作用，我认为可以简化为：

import 'dart:typed_data';

void main() {
  print(convertFloatToRegisters(43554.975));
}

Int32List convertFloatToRegisters(double floatValue) {
  final floatBytes = ByteData(4)..setFloat32(0, floatValue);

  final returnValue = Int32List(2);
  returnValue[0] = floatBytes.getUint16(2);
  returnValue[1] = floatBytes.getUint16(0);

  return returnValue;
}

针对稍后发布的双示例进行了更新

import 'dart:typed_data';

void main() {
  print(convertDoubleToRegisters(43554.975)); // [13107, 13107, 17503, 16613]
}

Int32List convertDoubleToRegisters(double doubleValue) {
  final doubleBytes = ByteData(8)..setFloat64(0, doubleValue);

  final returnValue = Int32List(4);
  returnValue[0] = doubleBytes.getUint16(6);
  returnValue[1] = doubleBytes.getUint16(4);
  returnValue[2] = doubleBytes.getUint16(2);
  returnValue[3] = doubleBytes.getUint16(0);

  return returnValue;
}

Answer 2

那这个呢：

        /// <summary>
    /// Converts 64 Bit double prec Value to four ModbusRegisters
    /// </summary>
    /// <param name="doubleValue">double value which has to be converted into four registers</param>
    /// <returns>Register values</returns>
    public static int[] ConvertDoubleToRegisters(double doubleValue)
    {
        byte[] doubleBytes = BitConverter.GetBytes(doubleValue);
        byte[] highRegisterBytes =
        {
            doubleBytes[6],
            doubleBytes[7],
            0,
            0
        };
        byte[] highLowRegisterBytes =
        {
            doubleBytes[4],
            doubleBytes[5],
            0,
            0
        };
        byte[] lowHighRegisterBytes =
        {
            doubleBytes[2],
            doubleBytes[3],
            0,
            0
        };
        byte[] lowRegisterBytes =
        {

            doubleBytes[0],
            doubleBytes[1],
            0,
            0
        };
        int[] returnValue =
        {
            BitConverter.ToInt32(lowRegisterBytes,0),
            BitConverter.ToInt32(lowHighRegisterBytes,0),
            BitConverter.ToInt32(highLowRegisterBytes,0),
            BitConverter.ToInt32(highRegisterBytes,0)
        };
        return returnValue;
    }

将浮点数转换为 dart 中的 modbus 寄存器

Convert float to modbus registers in dart

modbus

dart

flutter

针对稍后发布的双示例进行了更新