通过串行连接(C#)从智能卡读卡器接收数据
通过串行连接(C#)从智能卡读卡器接收数据
提问于 2012-05-02 11:24:01
我必须设计一个软件来与智能卡读卡器通信。
作为第一步，我希望从读卡器接收数据，并将它们显示在文本框中，当文本框发生变化时，我可以立即看到这些数据(以确保已经发送了数据)。
由读卡器发送的数据(我用来用PLC编程)是一个256字节的数组。
我确实执行了相同的方法，但是在我的富文本框中没有显示任何内容。
我想让你看看我的代码，告诉我出了什么问题：
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中获得以下输出，如下所示。其中，整个消息出现，缓冲区数组的每个字节的xxx值根据智能卡读取器的状态进行更改(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事情) ..当有连接，卡被插入读卡器时，缓冲区1，2和3的值应立即从0变为48,48,48,48，48，48，48，48，48，48，48，48(由读卡器发送)。以此类推。
buffer:
[0]=xxx
[1]=xxx
[2]=xxx
[3]=xxx
[4]=xxx
[5]=xxx
[6]=xxx
...
...
...
[255]=xxx相反，盒子是空的。
希望是我的前奏。很清楚..。我真的很想在这里找到解决办法。这对我来说是件很重要的事。我花了很多时间去尝试却没有成功
智能卡读卡器类型: KDM9650
Stack Overflow用户
发布于 2012-05-02 11:28:25
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
}然后运行您的应用程序，在它停止后，在断点上检查缓冲区是否为空？
Update2 Ok，试试这段代码，并阅读我的评论。
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();
}
}
}您有一个SerialPort类的实例。实例名为s1。您已经配置了它，但是尝试从新的serialPort对象读取数据。显然那里没有数据。
串行端口详细信息
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/10412751
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