C#通过Activex实现Web客户端读取RFID

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，但对这两块不是很熟悉，所以采用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

首先编写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 "";
        }

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace RFIDReader
{
    [ComImport, GuidAttribute("0CBD6597-3953-4B88-8C9F-F58B1B023413 ")]
    [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)]
publicpartialclass Reader : UserControl,IObjectSafety
{

public Reader()
{
InitializeComponent();
}

#region IObjectSafety 成员

publicvoid GetInterfacceSafyOptions(int riid, outint pdwSupportedOptions, outint pdwEnabledOptions)
{
pdwSupportedOptions =1;
pdwEnabledOptions =2;
}

publicvoid SetInterfaceSafetyOptions(int riid, int dwOptionsSetMask, int dwEnabledOptions)
{
thrownew NotImplementedException();
}

#endregion

privatevoid timer1_Tick(object sender, EventArgs e)
{
ReadRfid rfid=new ReadRfid();
string str = rfid.CardNum;
if (str !="")
{
textBox1.Text = str; GetInfo();
}
}
publicint TimerSpan
{
get { return timer1.Interval; }
set { timer1.Interval = value; }
}
publicstring CardNum
{
get { return textBox1.Text; }
}
privatevoid GetInfo()
{
this.label1.Text ="cccc";
}
}
}

为了能够在所有客户端ie上显示控件，要在程序的AssemblyInfo.cs里添加如下语句

[assembly: AllowPartiallyTrustedCallers()]

下一步，右键该项目，属性，生成，将为com互操作注册，打上勾勾