QR二維碼比其他二維碼相比，具有識(shí)讀速度快、數(shù)據(jù)密度大、占用空間小的優(yōu)勢(shì)。QR碼的三個(gè)角上有三個(gè)尋象圖形，使用CCD識(shí)讀設(shè)備來(lái)探測(cè)碼的位置、大小、傾斜角度、并加以解碼，實(shí)現(xiàn)360讀高速識(shí)讀。每秒可以識(shí)讀30個(gè)含有100個(gè)字符QR碼。QR碼容量密度 大，可以放入1817個(gè)漢字、7089個(gè)數(shù)字、4200個(gè)英文字母。QR碼用數(shù)據(jù)壓縮方式表示漢字，僅用13bit即可表示一個(gè)漢字，比其他二維條碼表示 漢字的效率提高了20%。QR具有4個(gè)等級(jí)的糾錯(cuò)功能，即使破損或破損也能夠正確識(shí)讀。QR碼抗彎曲的性能強(qiáng)，通過(guò)QR碼中的每隔一定的間隔配置有校正圖 形，從碼的外形來(lái)求得推測(cè)校正圖形中心點(diǎn)與實(shí)際校正圖形中心點(diǎn)的誤差來(lái)修正各個(gè)?？斓闹行木嚯x，即使將QR碼貼在彎曲的物品上也能夠快速識(shí)讀。QR碼可以分割成16個(gè)QR碼，可以一次性識(shí)讀數(shù)個(gè)分割碼，適應(yīng)于印刷面積有限及細(xì)長(zhǎng)空間印刷的需要。此外微型QR碼可以在1厘米的空間內(nèi)放入35個(gè)數(shù)字或9個(gè)漢字 或21個(gè)英文字母，適合對(duì)小型電路板對(duì)ID號(hào)碼進(jìn)行采集的需要。
$(document).ready(function ()
{
var options = {
beforeSubmit: showRequest,
success: showResponse,
dataType: 'json',
clearForm: true,
error: function (request, message, ex)
{
alert('錯(cuò)誤：' + 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=settxt_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("錯(cuò)誤：" + message);
}
});
}
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\":\"沒(méi)有上傳文件\"}]}]");
}
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進(jìn)制或16進(jìn)制轉(zhuǎn)換為中文
/// /summary>
/// param name="name">要轉(zhuǎn)換的字符串/param>
/// param name="fromBase">進(jìn)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;
}
}
}
