C#用Activex实现Web客户端读取RFID功能

2023-05-17 11:41:57

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本文介绍了在C#中使用Activex实现Web客户端读取RFID功能。

由于要在Web项目中采用RFID读取功能，所以有必要开发Activex，一般情况下开发Activex都采用VC，VB等，而本文采用C#编写Activex的方式实现。

本文方法参考网络

1.编写WindowsFromControls

2.发布WindowsFormControls为Activex

3.在web中使用该Activex

1、编写windows控件

如何编写不再详述（注意一个地方，GUID自己用vs工具生成一个，下面会用到。我的0CBD6597-3953-4B88-8C9F-F58B1B023413）

重要的类：

using System;
using System.Runtime.InteropServices;
namespace RFIDReader
{
public class ReadRfid
{
[DllImport("MasterRD.dll")]
private static extern int rf_init_com(int port, int baud);
[DllImport("MasterRD.dll")]
private static extern int rf_request(short icdev, byte model, ref short TagType);
[DllImport("MasterRD.dll")]
private static extern int rf_write(int icdev, char _Adr, char _Data);
[DllImport("MasterRD.dll")]
private static extern int rf_anticoll(short icdev, byte bcnt, ref byte ppsnr, ref byte pRLength);
[DllImport("MasterRD.dll")]
private static extern int rf_ClosePort();
public string CardNum
{
get { return getCardNum(); }
}
private string getCardNum()
{
int post = 4; //调用COM1口
int baud = 9600;
int i = -1;
byte model = 82;
byte b1 = 4;
short TagType = 4;
byte[] buf1 = new byte[200];
try
{
rf_init_com(post, baud);
rf_request(0, model, ref TagType);
rf_anticoll(0, 4, ref buf1[0], ref b1);
string s1 = "";
for (i = 0; i < b1; i++)
{
s1 = s1 + System.Convert.ToString(long.Parse(buf1[i].ToString()), 16).ToUpper();
}
rf_ClosePort();
if (s1 == "0000")
{ throw (new Exception()); }
return s1;
}
catch (Exception)
{
}
return "";
}
}
}

view sourceprint?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace RFIDReader
{
[ComImport, GuidAttribute("<SPAN style="COLOR: #800000">0CBD6597-3953-4B88-8C9F-F58B1B023413</SPAN>
<SPAN style="COLOR: #800000"> </SPAN>")]
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IObjectSafety
{
[PreserveSig]
void GetInterfacceSafyOptions(
int riid,
out int pdwSupportedOptions,
out int pdwEnabledOptions);
[PreserveSig]
void SetInterfaceSafetyOptions(
int riid,
int dwOptionsSetMask,
int dwEnabledOptions);
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using CJ;
namespace RFIDReader{
[Guid("0CBD6597-3953-4B88-8C9F-F58B1B023413"), ProgId("RFIDReader.Reader"), ComVisible(true)]
public partial class Reader : UserControl,IObjectSafety
{
public Reader()
{
InitializeComponent();
}
#region IObjectSafety 成员
public void GetInterfacceSafyOptions(int riid, out int pdwSupportedOptions, out int pdwEnabledOptions)
{
pdwSupportedOptions = 1;
pdwEnabledOptions = 2;
}
public void SetInterfaceSafetyOptions(int riid, int dwOptionsSetMask, int dwEnabledOptions)
{
throw new NotImplementedException();
}
#endregion
private void timer1_Tick(object sender, EventArgs e)
{
ReadRfid rfid=new ReadRfid();
string str = rfid.CardNum;
if (str != "")
{
textBox1.Text = str; GetInfo();
}
}
public int TimerSpan
{
get { return timer1.Interval; }
set { timer1.Interval = value; }
} public string CardNum
{
get { return textBox1.Text; }
}
private void GetInfo()
{
this.label1.Text = "cccc";
} }}