【ASP】ASP.NET实现二维码（QRCode）的创建和读取实例-NET--二维码-QRCode-创建

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ASP.NET实现二维码（QRCode）的创建和读取实例

using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Text;
using System.Text.RegularExpressions;
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;
using ThoughtWorks.QRCode.Codec.Util;
public class test : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType="text/plain";
        string cmd=context.Request["cmd"]==null ? "get" : context.Request["cmd"].ToString();
        string filename=string.Empty;
        string filepath=string.Empty;
        switch (cmd)
        {
            case "get":
                if (context.Request.Files.Count > 0)
                {
                    for (int j=0; j < context.Request.Files.Count; j++)
                    {
                        filename=Guid.NewGuid().ToString() + "_tmp.jpg";
                        filepath=context.Server.MapPath(@"~\Utilty\QRCode\upload") + "\\" + filename;
                        string qrdecode=string.Empty;
                        HttpPostedFile uploadFile=context.Request.Files[j];
                        uploadFile.SaveAs(filepath);

                        QRCodeDecoder decoder=new QRCodeDecoder();                        
                        Bitmap bm=new Bitmap(filepath);
                        qrdecode=decoder.decode(new QRCodeBitmapImage(bm));
                        bm.Dispose();                 
                       
                        context.Response.Write("[{\"count\":1,\"list\":[{\"imgurl\":\"upload/" + filename + "\",\"qrtext\":\"" + qrdecode + "\"}]}]");
                    }
                }
                else
                {
                    context.Response.Write("[{\"count\":0,\"list\":[{\"error\":\"没有上传文件\"}]}]");
                }
                break;
            case "set":
                string txt_qr=ConverToGB(context.Request["txt_qr"].ToString().Trim(), 16);
                string qrEncoding=context.Request["qrEncoding"].ToString();
                string Level=context.Request["Level"].ToString();
                string txt_ver=context.Request["txt_ver"].ToString();
                string txt_size=context.Request["txt_size"].ToString();

                QRCodeEncoder qrCodeEncoder=new QRCodeEncoder();
                String encoding=qrEncoding;
                if (encoding=="Byte")
                {
                    qrCodeEncoder.QRCodeEncodeMode=QRCodeEncoder.ENCODE_MODE.BYTE;
                }
                else if (encoding=="AlphaNumeric")
                {
                    qrCodeEncoder.QRCodeEncodeMode=QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;
                }
                else if (encoding=="Numeric")
                {
                    qrCodeEncoder.QRCodeEncodeMode=QRCodeEncoder.ENCODE_MODE.NUMERIC;
                }
                try
                {
                    int scale=Convert.ToInt16(txt_size);
                    qrCodeEncoder.QRCodeScale=scale;
                }
                catch (Exception ex)
                {
                    return;
                }
                try
                {
                    int version=Convert.ToInt16(txt_ver);
                    qrCodeEncoder.QRCodeVersion=version;
                }
                catch (Exception ex)
                {
                    return;
                }
                string errorCorrect=Level;
                if (errorCorrect=="L")
                    qrCodeEncoder.QRCodeErrorCorrect=QRCodeEncoder.ERROR_CORRECTION.L;
                else if (errorCorrect=="M")
                    qrCodeEncoder.QRCodeErrorCorrect=QRCodeEncoder.ERROR_CORRECTION.M;
                else if (errorCorrect=="Q")
                    qrCodeEncoder.QRCodeErrorCorrect=QRCodeEncoder.ERROR_CORRECTION.Q;
                else if (errorCorrect=="H")
                    qrCodeEncoder.QRCodeErrorCorrect=QRCodeEncoder.ERROR_CORRECTION.H;

                Image image;
                String data=txt_qr;
                image=qrCodeEncoder.Encode(data);
                filename=Guid.NewGuid().ToString() + ".jpg";
                filepath=context.Server.MapPath(@"~\Utilty\QRCode\upload") + "\\" + filename;
                System.IO.FileStream fs=new System.IO.FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
                image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
                fs.Close();
                image.Dispose();
                context.Response.Write("[{\"count\":1,\"list\":[{\"imgurl\":\"upload/" + filename + "\"}]}]");

                //context.Response.Write(@"upload\" + filename);
                break;
        }
    }
    /// <summary>
    /// 10进制或16进制转换为中文
    /// </summary>
    /// <param name="name">要转换的字符串</param>
    /// <param name="fromBase">进制（10或16）</param>
    /// <returns></returns>
    public string ConverToGB(string text, int fromBase)
    {
        string value=text;
        MatchCollection mc;
        System.Text.StringBuilder sb=new System.Text.StringBuilder();
        switch (fromBase)
        {
            case 10:
                MatchCollection mc1=Regex.Matches(text, @"&#([\d]{5})", RegexOptions.Compiled | RegexOptions.IgnoreCase);
                foreach (Match _v in mc1)
                {
                    string w=_v.Value.Substring(2);
                    w=Convert.ToString(int.Parse(w), 16);
                    byte[] c=new byte[2];
                    string ss=w.Substring(0, 2);
                    int c1=Convert.ToInt32(w.Substring(0, 2), 16);
                    int c2=Convert.ToInt32(w.Substring(2), 16);
                    c[0]=(byte)c2;
                    c[1]=(byte)c1;
                    sb.Append(Encoding.Unicode.GetString(c));
                }
                value=sb.ToString();

                break;
            case 16:
                mc=Regex.Matches(text, @"\\u([\w]{2})([\w]{2})", RegexOptions.Compiled | RegexOptions.IgnoreCase);
                if (mc !=null && mc.Count > 0)
                {

                    foreach (Match m2 in mc)
                    {
                        string v=m2.Value;
                        string w=v.Substring(2);
                        byte[] c=new byte[2];
                        int c1=Convert.ToInt32(w.Substring(0, 2), 16);
                        int c2=Convert.ToInt32(w.Substring(2), 16);
                        c[0]=(byte)c2;
                        c[1]=(byte)c1;
                        sb.Append(Encoding.Unicode.GetString(c));
                    }
                    value=sb.ToString();
                }
                break;
        }
        return value;
    }
    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

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