ASP.NET实现二维码(QRCode)的创建和读取

2013 年 2 月 18 日5330

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  一、项目引用QRCode的DLL文件(ThoughtWorks.QRCode.dll)

  二、ASPX页面(两个jquery的js文件请自行去官网下载):

  [html]

  <html xmlns="http://http://www.zjjv.com///1999/xhtml">

  <head runat="server">

  <title>二维码工具测试</title>

  <script type="text/javascript" src="//Scripts/Jquery/jquery-1.6.2.js"></script>

  <script type="text/javascript" src="//Scripts/Jquery/jquery.form.js"></script>

  <script type="text/javascript" src="js/test.js"></script>

  <style type="text/css">

  .style1

  {

  width: 100%;

  }

  #txt_qr

  {

  width: 632px;

  }

  </style>

  </head>

  <body>

  <div>

  <table>

  <tr>

  <td>

  输入文字:

  </td>

  <td>

  <input type="text" />

  </td>

  </tr>

  <tr>

  <td>

  二维码图片

  </td>

  <td>

  <img alt="二维码图片" />

  </td>

  </tr>

  <tr>

  <td>

  生成选项

  </td>

  <td>

  Encoding:<select>

  <option value="Byte">Byte</option>

  <option value="AlphaNumeric">AlphaNumeric</option>

  <option value="Numeric">Numeric</option>

  </select>

  Correction Level:<select>

  <option value="M">M</option>

  <option value="L">L</option>

  <option value="Q">Q</option>

  <option value="H">H</option>

  </select>

  Version:<input type="text" value="7" />(1-40) Size:<input

  type="text" value="4" />

  </td>

  </tr>

  <tr>

  <td colspan="4">

  <input type="button" value="生成二维码" />

  </td>

  </tr>

  <tr>

  <td>

  <form action="Ashx/test.ashx" method="post" enctype="multipart/form-data">

  <input type="file" /><input type="submit" value="读取二维码" />

  </form>

  </td>

  <td colspan="1">

  <img alt="要读取的图片" /><br />

  <input type="text" />

  </td>

  </tr>

  </table>

  </div>

  </body>

  </html>

  三、test.js文件

  [javascript]

  $(document)。ready(function ()

  {

  var options = {

  beforeSubmit: showRequest,

  success: showResponse,

  dataType: 'json',

  clearForm: true,

  error: function (request, message, ex)

  {

  alert('错误:' + message);

  }

  };

  $('#qrForm')。ajaxForm(options);

  });

  function showRequest(formData, jqForm, options)

  {

  return true;

  }

  function showResponse(responseText, statusText, xhr, $form)

  {

  if (responseText[0].count == 0)

  {

  alert(responseText[0].list[0].error);

  return false;

  }

  $("#img_qr")。attr("src", responseText[0].list[0].imgurl);

  $("#txt_readqr")。val(responseText[0].list[0].qrtext);

  return false;

  }

  function getQrImg()

  {

  var txt_qr = escape($.trim($("#txt_qr")。val()));

  var qrEncoding = $("#Encoding")。val(); ;

  var Level = $("#Level")。val(); ;

  var txt_ver = $("#txt_ver")。val(); ;

  var txt_size = $("#txt_size")。val(); ;

  $.ajax({

  type: "GET",

  data: "cmd=set&txt_qr=" + txt_qr + "&qrEncoding=" + qrEncoding + "&Level=" + Level + "&txt_ver=" + txt_ver + "&txt_size=" + txt_size,

  url: "Ashx/test.ashx",

  dataType: 'text',

  beforeSend: function (x)

  {

  x.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8");

  },

  success: function (json)

  {

  var dataObj = eval(json);

  $("#qrimg")。attr("src", dataObj[0].list[0].imgurl);

  return false;

  },

  error: function (request, message, ex)

  {

  alert("错误:" + message);

  }

  });

  }

  四、test.ashx,没有判断目录是否存在等问题,请自行建立或者更改代码。

  [csharp]

  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 + "\"}]}]");

  }

  }

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