C#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，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：

如果你看到这段文字，说明您正使用RSS阅读或转自《一棵树-博客园》，原文地址：http://www.cnblogs.com/atree/archive/2011/05/09/CSharp-Activex-Web-RFID.html

using System;
using System.Runtime.InteropServices;

namespace RFIDReader
{
publicclass ReadRfid
{
[DllImport("MasterRD.dll")]
privatestaticexternint rf_init_com(int port, int baud);
[DllImport("MasterRD.dll")]
privatestaticexternint rf_request(short icdev, byte model, refshort TagType);
[DllImport("MasterRD.dll")]
privatestaticexternint rf_write(int icdev, char _Adr, char _Data);
[DllImport("MasterRD.dll")]
privatestaticexternint rf_anticoll(short icdev, byte bcnt, refbyte ppsnr, refbyte pRLength);
[DllImport("MasterRD.dll")]
privatestaticexternint rf_ClosePort();

publicstring CardNum
{
get { return getCardNum(); }
}
privatestring 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 =newbyte[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("<SPAN style="COLOR: #800000">0CBD6597-3953-4B88-8C9F-F58B1B023413</SPAN><SPAN style="COLOR: #800000"> </SPAN>")]
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
publicinterface IObjectSafety
{
[PreserveSig]
void GetInterfacceSafyOptions(
int riid,
outint pdwSupportedOptions,
outint 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";
        }
    }
}

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()]

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