Question

我必须设计一个与智能卡读卡器通信的软件..

作为第一步，我想从读卡器接收数据并将其显示在一个文本框中，我可以立即看到它发生变化（以确保已发送数据）..

读卡器发送的数据（因为我用PLC编程）是一个256字节的数组

我确实执行了相同的方法，但我的richtextbox中没有显示任何内容..

我希望你看看我的代码并告诉我什么是错的：

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.Ports;
using System.IO;

namespace mycard
{
    public partial class Form1 : Form
    {
        byte[] memo = new byte[256];
        byte[] buffer = new byte[255];

        private SerialPort serialPort = new SerialPort();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            serialPort.DataReceived += 
                new SerialDataReceivedEventHandler(serialPort_DataReceived);
        }

        //open port
        private void button1_Click(object sender, EventArgs e)
        {
            if (s1.IsOpen)
            {
                s1.Close();
            }
            s1.Open();
        }


        //Eject order which is working fine
        private void button1_Click_1(object sender, EventArgs e)
        {
            byte[] data= new byte[4];

            memo[0]=0x60;
            memo[1]=0x00;
            memo[2]=0x02;
            memo[3]=0x43;
            memo[4]=0x31; //32
            memo[5]=0x10; //13

            s1.Write(memo,0,6);
        }

        //close port
        private void button2_Click(object sender, EventArgs e)
        {
            s1.Close();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            txtDataReceived.Text = "\r\n";
        }

        public delegate void myDelegate();
        public void updateTextBox()
        {

            byte[] buffer = new byte[255];

            serialPort.Read(buffer, 0, 4);
            txtDataReceived.Text = (buffer[0].ToString() + Environment.NewLine 
                + buffer[1].ToString() + Environment.NewLine 
                + buffer[2].ToString() + Environment.NewLine 
                + buffer[3].ToString() + Environment.NewLine);

            // i have tried the following code as well but i got nothing as well
            // txtDataReceived.AppendText(serialPort.ReadExisting());
            // txtDataReceived.ScrollToCaret();

        }
    }
}

我希望在创建的richtextbox中得到以下输出，如下所示..整个消息出现，缓冲区数组的每个字节的xxx值根据智能卡读卡器的状态而改变（或换句话说，根据读卡器发送的内容）...

例如（我在上面的代码中试图做的）..虽然有连接，并且在读卡器中插入了卡，缓冲区[0]，[1]，[2]和[ 3]值应立即从0变为48,48,48,48（由读卡器发送）..等等..

buffer:
[0]=xxx
[1]=xxx
[2]=xxx
[3]=xxx
[4]=xxx
[5]=xxx
[6]=xxx
...
...
...
[255]=xxx

相反，该框为空......

希望我的问题。很清楚...我真的希望在这里找到解决方案..这对我来说是一件非常重要的事情......我花了很多时间尝试没有任何成功

智能卡读卡器类型：KDM9650

Answer 1

<强>更新

手动运行updateTextBox()（将其添加到ButtonClick EventHandler）

public void updateTextBox()
    {
        byte[] buffer = new byte[255];

        serialPort.Read(buffer, 0, 4); 
        var i = 0; //Press F9 here, it will put a breakpoint here
    }

然后运行你的应用程序，并在断点停止后检查缓冲区是否为空？

<强> UPDATE2 好的，试试这段代码，然后阅读我的评论。

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.Ports;
using System.IO;

namespace mycard
{
    public partial class Form1 : Form
    {
        byte[] memo = new byte[256];
        byte[] buffer = new byte[255];

        //private SerialPort serialPort = new SerialPort();
        //We don't need this object. We never configure it, it's not the 
        //same object which you use to write 'eject bytes'!
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           //subscribe on data received event here. IMPORTANT: we 'listen' s1 object here!
            s1.DataReceived += 
                new SerialDataReceivedEventHandler(serialPort_DataReceived);
        }

        //open port
        private void button1_Click(object sender, EventArgs e)
        {
            if (s1.IsOpen)
            {
                s1.Close();
            }
            s1.Open();
        }

        //Eject order which is working fine
        private void button1_Click_1(object sender, EventArgs e)
        {
            byte[] data= new byte[4];

            memo[0]=0x60;
            memo[1]=0x00;
            memo[2]=0x02;
            memo[3]=0x43;
            memo[4]=0x31; //32
            memo[5]=0x10; //13

            s1.Write(memo,0,6);
        }

        //close port
        private void button2_Click(object sender, EventArgs e)
        {
            s1.Close();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            txtDataReceived.Text = "\r\n";
        }

        public void updateTextBox()
        {
            byte[] buffer = new byte[255];

            //we must read from s1, not from serealPort!!!
            s1.Read(buffer, 0, 4);
            txtDataReceived.Text = (buffer[0].ToString() + Environment.NewLine 
                + buffer[1].ToString() + Environment.NewLine 
                + buffer[2].ToString() + Environment.NewLine 
                + buffer[3].ToString() + Environment.NewLine);
        }

        //data received, let's read it!
        private void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
          updateTextBox(); 
        }
    }
}

您的问题 您有一个SerialPort类的实例。实例名称为s1。您已配置它，但尝试从新的serialPort对象读取数据。显然那里没有数据。

Serial ports details

Answer 2

您需要实际阅读serialPort_DataReceived中的数据。你这里没做任何事。另外：有button1_Click个事件和button1_Click_1个事件。 button1正在调用哪一个？如果没有调用第一个，则根本不打开串口。

另外请注意：DataReceived事件在其自己的线程中调用，因此在更新UI之前，您需要使用this.Invoke（WinForms）或{{1}更改为UI线程（WPF）。

Answer 3

我在这里看到两个问题：

您没有从端口读取数据..
我认为您将在更新表单时遇到问题，因为它将从另一个线程调用。

让你去，你可以添加一个计时器，并在计时器刻度事件中读取数据，如果端口有任何数据：

    private void timer1_Tick(object sender, EventArgs e)
    {
        if (s1.BytesToRead > 0)
        {
            //write text to text box

            //e.g. maybe as a start try
            txtDataReceived.Text += s1.ReadExisting();
        }
    }

一个其他问题只是关于从另一个线程更新表单：

How to update the GUI from another thread in C#?

通过串行连接从智能卡读卡器接收数据（C＃）

3 个答案: