本示例使用设备： RFID网络WIFI无线TCP/UDP/HTTP可编程二次开发读卡器POE供电语音-淘宝网 (taobao.com)

<%@ WebHandler Language="C#" Class="HttpReader" %>

using System;
using System.Web;
using System.IO;
using Newtonsoft.Json;

public class HttpReader : IHttpHandler
{    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        string info = "";
        string jihao = "";
        string cardtype = "";
        string card = "";
        string Data = "";
        string dn = "";
        string Status = "";
        Int16 cardtype16 = 0;
        int cardtypecode = 0;
        int pushortake = 0;
        string dispstr = "";
        string ChineseVoice = "[v8]";    //[v8]表示本次播报语音音量，取值范围v1 到 v16

        if (context.Request["info"] != null) { info = context.Request["info"].ToString(); }             //接收到的数据包号，需回应该包号
        if (context.Request["jihao"] != null) { jihao = context.Request["jihao"].ToString(); }          //设备机号(可自编)
        if (context.Request["cardtype"] != null) { cardtype = context.Request["cardtype"].ToString(); } //卡类型，卡状态
        if (context.Request["card"] != null) { card = context.Request["card"].ToString(); }             //接收到的原始16进制卡号，可根据需要自行转换成其他卡号
        if (context.Request["Data"] != null) { Data = context.Request["Data"].ToString(); }             //扇区内容
        if (context.Request["dn"] != null) { dn = context.Request["dn"].ToString(); }                   //设备硬件序列号，出厂时已固化，全球唯一
        if (context.Request["Status"] != null) { Status = context.Request["Status"].ToString(); }       //读卡状态，如12表示卡密码认证失败    
        
        if (info != "" && jihao != "" && cardtype != "" && card != ""){
                cardtype16 = Convert.ToInt16(cardtype, 16);
                pushortake = cardtype16 / 128;       //pushortake=0 表示读卡，>0表示卡离开感应区
                cardtypecode = cardtype16 % 16;      //cardtypecode=1 ID卡，2 HID卡，3 T5557卡，4 EM4305卡，5 IC卡，6 二代身份证，7 是15693卡，IClass"                
         }
         else{    //如未获取到有效参数，使用JSON方式解析获取提交的参数
                context.Response.ContentType = "application/json";
                StreamReader sr = new StreamReader(context.Request.GetBufferlessInputStream());
                string response = sr.ReadToEnd();
            
                RootObject rb = JsonConvert.DeserializeObject<RootObject>(response);
                info = rb.info;            //接收到的数据包号，需回应该包号
                jihao = rb.jihao;          //设备机号(可自编)
                cardtype = rb.cardtype;    //卡类型，卡状态
                card = rb.card;            //接收到的原始16进制卡号，可根据需要自行转换成其他卡号
                Data = rb.data;            //扇区内容
                dn = rb.dn;                //设备硬件序列号，出厂时已固化，全球唯一
                Status = rb.status;        //读卡状态，如12表示卡密码认证失败

                if (info != "" && jihao != "" && cardtype != "" && card != "")
                {
                    cardtype16 = Convert.ToInt16(cardtype, 16);
                    pushortake = cardtype16 / 128;       //pushortake=0 表示读卡，>0表示卡离开感应区
                    cardtypecode = cardtype16 % 16;      // cardtypecode=1 ID卡，2 HID卡，3 T5557卡，4 EM4305卡，5 IC卡，6 二代身份证，7 是15693卡，IClass"                     
                }
        }

        if (info != "" && card != "")    //通过解析获取到了有效的参数，回应驱动读卡器显示文字、蜂鸣响声或播报语音
        {
            dispstr = "{" + getChinesecode("卡号") + ":}" + (card + "      ").Substring(0, 12) + DateTime.Now.ToString("yy-MM-dd HH:mm:ss"); //显示信息,注意中文汉字一定要转换为设备能显示的编码，其它字母数字符号不需要转换，{}内的信息反白显示

            if (pushortake > 0)
            {
                ChineseVoice = ChineseVoice + getChinesecode("卡号") + "[n1]" + card + getChinesecode("离开感应区！");     //TTS语音,注意中文汉字一定要转换为设备能识别的编码，[n1]表示数字播报方式，其它字母数字符号不需要转换              
            }
            else
            {
                ChineseVoice = ChineseVoice + getChinesecode("读取卡号") + "[n1]" + card;
            }

            string RepStr = "Response=1";             //Response=1 固定前缀，我们的设备以此来检索返回信息,表示 驱动设备显示和响声
            RepStr = RepStr + "," + info;             //提交的信息序号，一定要对应
            RepStr = RepStr + "," + dispstr;          //读卡器上显示文字
            RepStr = RepStr + ",20";                  //显示时长20秒
            RepStr = RepStr + ",2";                   //蜂鸣器发声种类，取值范围0-12
            RepStr = RepStr + "," + ChineseVoice;     //播报的TTS语音

            context.Response.Write(RepStr);
        }        
    }

    public class RootObject  //json类
    {
        public string info { get; set; }
        public string jihao { get; set; }
        public string cardtype { get; set; }
        public string card { get; set; }
        public string data { get; set; }
        public string dn { get; set; }
        public string status { get; set; }

    }
        
    public static string getChinesecode(string inputip)   //获取中文编码，显示汉字、TTS中文语音都要转换编码
    {
        byte[] Chinesecodearry = System.Text.Encoding.GetEncoding(936).GetBytes(inputip);
        int codelen = (byte)Chinesecodearry.Length;
        string hexcode = "";
        for (int i = 0; i < codelen; i++)
        {
            if (i % 2 == 0) { hexcode = hexcode + "\\x"; }
            hexcode = hexcode + Chinesecodearry[i].ToString("X2");
        }
        return hexcode;

    } 
    
    public bool IsReusable {
        get {
            return false;
        }
    }

}