在文本框中显示 Char 的十进制值

Question

我从 FPGA 接收到一个字节，它出现在文本框 4 中，但是，由于我的输出是（例如：0x03 或 0x07...）文本框中出现的是奇怪的符号（我相信这是 ASCII 表示0x03）：

所以我想要的输出只是3（0x03的十进制值），我该怎么做？我尝试了很多（请参阅我的代码的 textbox5）但我做不到，你能帮助初学者吗？谢谢。注意：我的FPGA计算M^e mod G-> 33^5 mod 35 = 3 --代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {


        public Form2()
        {
            InitializeComponent();
        }

        string RXstring = "";


        private void pictureBox2_Click(object sender, EventArgs e)
        {
            serialPort1.Close();
            Form1 myForm = new Form1();
            this.Close();


        }

        private void groupBox1_Enter(object sender, EventArgs e)
        {

        }

        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                if (!serialPort1.IsOpen)
                {

                    serialPort1.Open();
                    button3.Enabled = false;
                }
                else
                {
                    MessageBox.Show("Port is Open by other party!");

                }


            }
            catch (UnauthorizedAccessException ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void Form2_FormClosed(object sender, FormClosedEventArgs e)
        {
            serialPort1.Close();
        }

        private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            try
            {
                RXstring = serialPort1.ReadExisting();
                this.Invoke(new EventHandler(displaytext));
            }
            catch (System.TimeoutException)
            {

            }

            }
        private void displaytext(object s, EventArgs e)
        {
            //var a = RXstring[0];
            //var b = RXstring[1];
            //string h = String.Format("{0:X2}", RXstring);
             textBox4.AppendText(RXstring);


        }

        void button1_Click(object sender, EventArgs e)
        {
            //Get the strings (text)
            string textM = textBox1.Text;
            string textE = textBox2.Text;
            string textG = textBox3.Text;

            //Assuming you want unsigned numbers, convert to numeric types
            //You might want to put in exception handling for invalid inputs, watch for overflows etc.
            UInt16 bitsX = Convert.ToUInt16(0x1F01);
            UInt16 bitsM = Convert.ToUInt16(textM);
            UInt16 bitsE = Convert.ToUInt16(textE);
            UInt16 bitsG = Convert.ToUInt16(textG);


            /*
             * BitConverter puts the LSB at index 0, so depending on how you need to send the data,
             * you might want to reverse the bytes BitConverter.GetBytes(bitsM).Reverse();
             * or reverse the order you add them to the list
             */
            var byteList = new List<byte>();
            byteList.AddRange(BitConverter.GetBytes(bitsX));
            byteList.AddRange(BitConverter.GetBytes(bitsM));
            byteList.AddRange(BitConverter.GetBytes(bitsE));
            byteList.AddRange(BitConverter.GetBytes(bitsG));

            //Debugging message, uses LINQ 
            string bits = String.Join(" ",byteList.Select(b => b.ToString("X2")));
            MessageBox.Show(bits);


            //write the bytes
            var bitArray = byteList.ToArray();
            serialPort1.Write(bitArray, 0, 8);
            //var x = bitArray[1] + (bitArray[2] << 0) + (bitArray[3] << 0) + (bitArray[4] << 0) + (bitArray[5] << 0) + (bitArray[6] << 0) + (bitArray[7] << 0);

            //string y = String.Format("{0:X2}", x);
            //string y = System.Text.Encoding.UTF8.GetString(bitArray);
            //textBox5.AppendText(y);

        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
        }

        private void textBox5_TextChanged(object sender, EventArgs e)
        {
            var value = Convert.ToInt16(textBox4);
            string ss = value.ToString();

            MessageBox.Show(ss.ToString());
            string stringValue = Char.ConvertFromUtf32(value);

            decimal vOut = Convert.ToDecimal(textBox4);
            textBox5.AppendText(vOut.ToString());
        }
    }
}

Answer 1

在 for 循环中的某个点 x+2 变得大于字符串 M 的长度，因此出现错误。要摆脱它，请将第一个 for 循环更改为：

 for (i = 3; i < 13; i++)
 {
      if(x + 2 <= M.Length)
      {
          data[i + 1] = Convert.ToByte((M.Substring(x, 2)), 16);
          x += 2;
      }
  }

编辑 -
你提到输入是 1s 和 0s 的形式，这使得它成为二进制，在这种情况下将上面的更改为：

Convert.ToByte((M.Substring(x, 2)), 2);

Update 正如 IV4 正确指出的那样 - 您正在尝试将二进制字符串转换为字节，但代码旨在将十六进制字符串转换为字节需要修改代码以相应地工作。

 for (i = 3; i < 13; i++)
     {
          if(x + 8 <= M.Length)
          {
              data[i + 1] = Convert.ToByte((M.Substring(x, 8)), 2);
              x += 8;
          }
      }

Answer 2

您的代码尝试将 十六进制字符串（例如：1234567890ABCDEF） 转换为字节数组。查看它的简化版本

string M = "2A";
byte b = Convert.ToByte((M.Substring(0, 2)), 16);

这将为您提供十进制的 42。

您可以使用 .NET 中的内置类轻松完成此操作

byte[] data = SoapHexBinary.Parse(M).Value;

PS: SoapHexBinary 在 System.Runtime.Remoting.Metadata.W3cXsd2001 命名空间中

Answer 3

我将逻辑分解为几个步骤：

获取文本
将文本解析为数字（二进制）
将字节添加到列表中。
将List<byte>转换成数组发送到串口

我对以下部分进行了评论。我使用 Convert and BitConverter 来帮助进行转换。此代码故意冗长以帮助显示详细信息。

void button1_Click(object sender, EventArgs e)
{
    //Get the strings (text)
    string textM = textBox1.Text;
    string textE = textBox2.Text;
    string textG = textBox3.Text;

    //Assuming you want unsigned numbers, convert to numeric types
    //You might want to put in exception handling for invalid inputs, watch for overflows etc.
    UInt16 bitsM = Convert.ToUInt16(textM);
    byte bitsE = Convert.ToByte(textE);
    UInt32 bitsG = Convert.ToUInt32(textG);


    /*
     * BitConverter puts the LSB at index 0, so depending on how you need to send the data,
     * you might want to reverse the bytes BitConverter.GetBytes(bitsM).Reverse();
     * or reverse the order you add them to the list
     */
    var byteList = new List<byte>();
    byteList.AddRange(BitConverter.GetBytes(bitsM));
    byteList.AddRange(BitConverter.GetBytes(bitsE));
    byteList.AddRange(BitConverter.GetBytes(bitsG));

    //Debugging message, uses LINQ 
    string bits = String.Join(" ", byteList.Select(b => b.ToString("X2")));
    MessageBox.Show(bits);


    //write the bytes
    var bitArray = byteList.ToArray();
    serialPort1.Write(bitArray, 0, 7);
}

在文本框中显示 Char 的十进制值

Show the decimal value of Char in textbox

c#

winforms

serial-port