ASP.NET實現二維碼（QRCode）的創建和讀取

2019-11-17 01:57:11

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asp.net實現二維碼（QRCode）的創建和讀取

一、項目引用QRCode的DLL文件（ThoughtWorks.QRCode.dll）二、ASPX頁面（兩個jquery的js文件請自行去官網下載）：[html]<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>二維碼工具測試</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 class="style1"> <tr> <td> 輸入文字： </td> <td> <input type="text" id="txt_qr" name="txt_qr" /> </td> </tr> <tr> <td> 二維碼圖片 </td> <td> <img id="qrimg" alt="二維碼圖片" /> </td> </tr> <tr> <td> 生成選項 </td> <td> Encoding:<select id="Encoding"> <option value="Byte">Byte</option> <option value="AlphaNumeric">AlphaNumeric</option> <option value="Numeric">Numeric</option> </select> Correction Level:<select id="Level"> <option value="M">M</option> <option value="L">L</option> <option value="Q">Q</option> <option value="H">H</option> </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 colspan="4"> <input type="button" onclick="getQrImg();" value="生成二維碼" /> </td> </tr> <tr> <td> <form id="qrForm" action="Ashx/test.ashx" method="post" enctype="multipart/form-data"> <input type="file" id="file_qr" name="file_qr" /><input type="submit" value="讀取二維碼" /> </form> </td> <td colspan="1"> <img id="img_qr" alt="要讀取的圖片" /><br /> <input id="txt_readqr" 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('錯誤：' + 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=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("錯誤：" + message); } }); } 四、test.ashx，沒有判斷目錄是否存在等問題，請自行建立或者更改代碼。[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") + "http://" + 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") + "http://" + filename; System.IO.FileStream fs = new System.IO.FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.File access.Write); image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg); fs.Close(); image.Dispose(); context.Response.Write("[{/"count/":1,/"list/":[{/"imgurl/":/"upload/" + filename + "/"}]}]"); //

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