ASP.NET实现二维码（QRCode）的创建和读取

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]

<title>二维码工具测试</title>

.style1

{

width: 100%;

}

#txt_qr

{

width: 632px;

}

</style>

</head>

<body>

<div>

<tr>

<td>

输入文字：

</td>

<td>

</td>

</tr>

<tr>

<td>

二维码图片

</td>

<td>

</td>

</tr>

<tr>

<td>

生成选项

</td>

<td>

Encoding:<select id="Encoding">

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

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

</select>

Correction Level:<select id="Level">

</select>

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

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

</td>

</tr>

<tr>

</td>

</tr>

<tr>

<td>

</form>

</td>

</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 + "\"}]}]");

}

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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