Monday, November 11, 2013

QrCode in asp.net c#

Create QRCODE with the help of handler.before writting this code i tried many libraries but none of them work for me.In the last i found handler which is given below

QRCode Problem Resolved
  1. No Watermark
  2. You can give width and height. Both Will be same such as qrcode image will be 200 X 200 px when you are giving input 200.
  3. Images are automatically save in the folder.
  4. Here i m creating QRCODE Image, Pdf, Eps format.
How to Create QRCODE

  • Create Default website File --> New --> Website
  • Add To Dll
    1. Gma.QrCodeNet.Encoding.Net35.dll 
    2. itextsharp.dll
  1. Rename Default.aspx  to test.aspx
Here the test.aspx Code copy and paste it
 <%@ Page Language="C#" AutoEventWireup="true"  CodeFile="test.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title>Untitled Page</title>

    <link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/css/bootstrap-combined.min.css" rel="stylesheet">

        <script type="text/javascript">

               function generate() {

                       var t = document.getElementById('t').value;

                       var e = document.getElementById('e').value;

                       //var q = document.getElementById('q').value;

                       var q = document.getElementById('size').value;

                       var s = document.getElementById('s').value;

                       var f = document.getElementById('f').value;

                       var image = document.getElementById('result');

                       //image.src = 'QrCodeHandler.ashx?e=' + e + '&q=' + q + '&s=' + s + '&f=' + f + '&t=' + encodeURI(t);

                       image.src = 'QrCodeHandler.ashx?e=' + e + '&q=' + q + '&s=' + s + '&f=' + f + '&t=' + encodeURI(t);

                       image.alt = image.title = t;

                       return false;

               }

        </script>

</head>

<body>

   <div class="container">

               <div class="page-header">

                       <h1>Native JavaScript <a href="/index.htm" class="pull-right"><i class="icon-home"></i></a></h1>

                       <p>A single JavaScript function building the URL to get the QR code image. Doesn't use jQuery or any other library.</p>

               </div>

               <div class="row">

                       <div class="span8">

                              <form class="form-horizontal" runat=server id="form1">

                                      <div class="control-group">

                                             <label class="control-label" for="t">QR code content</label>

                                             <div class="controls">

                                                     <input type="text" id="t" placeholder="QR code content" class="input-block-level">

                                             </div>

                                      </div>

                                      <div class="control-group">

                                             <label class="control-label" for="e">Error correction level</label>

                                             <div class="controls">

                                                     <select id="e">

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

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

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

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

                                                     </select>

                                             </div>

                                      </div>

                                      <div class="control-group">

                                             <label class="control-label" for="size">QR code content size</label>

                                             <div class="controls">

                                                     <input type="text" id="size" placeholder="QR code content" class="input-block-level">

                                             </div>

                                      </div>

                                      <div class="control-group">

                                             <label class="control-label" for="f">Image Format</label>

                                             <div class="controls">

                                                     <select id="f">

                                                            <option value="Png" selected="selected">Png</option>

                                                            <option value="Gif" >Gif</option>

                                                            <option value="jpeg">Jpeg</option>

                                                     </select>

                                             </div>

                                      </div>

                                      <div class="control-group">

                                             <label class="control-label" for="s">Module size</label>

                                             <div class="controls">

                                                     <select id="s">

                                                            <option value="4">4</option>

                                                            <option value="8">8</option>

                                                            <option value="12" selected="selected">12</option>

                                                     </select>

                                             </div>

                                      </div>

                                      <div class="control-group">

                                             <div class="controls">

                                                     <a onclick="return generate()" class="btn">Generate</a>

                            <asp:Button ID="btnsave" runat="server" Text="Save" onclick="btnsave_Click" class="btn" />

                                             </div>

                                      </div>

                              </form>

                       </div>

                       <div class="span4">

                              <img id="result" runat=server/>

                       </div>

               </div>

        </div>

</body>

</html>


Test.aspx.cs
using System;

using System.Drawing.Imaging;

using System.IO;

using System.Net;

using System.Web;

using Gma.QrCodeNet.Encoding;

using Gma.QrCodeNet.Encoding.Windows.Render;

public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

      

    }

    public void saveimage(string ImageLink)

    {

   

    }

    protected void btnsave_Click(object sender, EventArgs e)

    {

        Response.Write(result.Src.ToString().Trim());

    }

}

  • Create Three Folder Name them eps, images, pdf on the root .
  • Right Click On Solution Explorer -->Add New item --> Generic handler

    1.     Name handler as QrCodeHandler.ashx

    QrCodeHandler.ashx.cs Code 
  • using System;

    using System.Drawing.Imaging;

    using System.IO;

    using System.Net;

    using System.Web;

    using Gma.QrCodeNet.Encoding;

    using Gma.QrCodeNet.Encoding.Windows.Render;

    using System.Drawing;

    using iTextSharp.text.pdf;

    /// <summary>

    /// Summary description for QrCodeHandler

    /// </summary>

    public class QrCodeHandler : IHttpHandler

    {

        public void ProcessRequest(HttpContext context)

        {

            // Retrieve the parameters from the QueryString

            var codeParams = CodeDescriptor.Init(context.Request);

            // Encode the content

            if (codeParams == null || !codeParams.TryEncode())

            {

                context.Response.StatusCode = (int)HttpStatusCode.BadRequest;

                return;

            }

            //



         

            // Render the QR code as an image

            using (var ms = new MemoryStream())

            {

                codeParams.Render(ms);

                string appPath = HttpContext.Current.Request.ApplicationPath;

                string physicalPath = HttpContext.Current.Request.MapPath(appPath);

                string strpath = physicalPath + "";

                string WorkingDirectory = strpath;

              

                System.Drawing.Image imgSave = System.Drawing.Image.FromStream(ms);

                Bitmap bmSave = new Bitmap(imgSave);

                Bitmap bmTemp = new Bitmap(bmSave);

               // Graphics grSave = Graphics.FromImage(bmTemp);

               //grSave.DrawImage(imgSave, 0, 0, 12*33, 12*33);

                String pdfextension = Convert.ToString(DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Second.ToString());

                bmTemp.Save(WorkingDirectory + "\\images\\" + "abc1" + pdfextension + "."+codeParams.ImgFormat.ToString().Trim());

                // Create eps

                bmTemp.Save(WorkingDirectory + "\\eps\\" + "abc1" + pdfextension + ".eps");

                // eps close

                // Create and Save pdf

                var doc1 = new iTextSharp.text.Document();

                // path = image source

                String path = WorkingDirectory + "\\images\\" + "abc1" + pdfextension + "." + codeParams.ImgFormat.ToString().Trim();

                PdfWriter.GetInstance(doc1, new FileStream(WorkingDirectory + "/pdf/" +"abc1"+ pdfextension + ".pdf", FileMode.Create));

                doc1.Open();

                String filename = path;

                String[] getimage = filename.Split('\\');

                using (FileStream fs = new FileStream(WorkingDirectory+ "\\images\\" + getimage[4], FileMode.Open))

                {

                   iTextSharp.text.Image png = iTextSharp.text.Image.GetInstance(Image.FromStream(fs), System.Drawing.Imaging.ImageFormat.Png);

                 //  png.ScaleAbsolute(500, 300);

                   doc1.Add(png);

                }

                doc1.Close();

                // pdf close

             

                imgSave.Dispose();

                bmSave.Dispose();

                bmTemp.Dispose();

               // grSave.Dispose();

             

                context.Response.ContentType = codeParams.ContentType;

                context.Response.OutputStream.Write(ms.GetBuffer(), 0, (int)ms.Length);

            }

        }

        /// <summary>

        /// Return true to indicate that the handler is thread safe because it is stateless

        /// </summary>

        public bool IsReusable

        {

            get { return true; }

        }

    }

    /// <summary>

    /// Class containing the description of the QR code and wrapping encoding and rendering.

    /// </summary>

    internal class CodeDescriptor

    {

        public ErrorCorrectionLevel Ecl;

        public string Content;

        public QuietZoneModules QuietZones;

        public int ModuleSize;

        public BitMatrix Matrix;

        public string ContentType; 

        public string ImgFormat;

        public int ImgSize;

        /// <summary>

        /// Parse QueryString that define the QR code properties

        /// </summary>

        /// <param name="request">HttpRequest containing HTTP GET data</param>

        /// <returns>A QR code descriptor object</returns>

        public static CodeDescriptor Init(HttpRequest request)

        {

            var cp = new CodeDescriptor();

            // Error correction level

            if (!TryParse(request.QueryString["e"], out cp.Ecl))

                cp.Ecl = ErrorCorrectionLevel.M;

            // Code content to encode

            cp.Content = request.QueryString["t"];

            // Size of the quiet zone

            //if (!TryParse(request.QueryString["q"], out cp.QuietZones))

            //    cp.QuietZones = QuietZoneModules.Two;

         

            // Module size

            if (!int.TryParse(request.QueryString["s"], out cp.ModuleSize))

                cp.ModuleSize = 12;

            if (!int.TryParse(request.QueryString["q"], out cp.ImgSize))

                cp.ImgSize = 396;

            if (request.QueryString["f"].ToString().ToLower() == "png")

            {

                cp.ImgFormat = "png";

            }

            else if (request.QueryString["f"].ToString().ToLower() == "jpeg")

            {

                cp.ImgFormat = "jpeg";

            }

            else if (request.QueryString["f"].ToString().ToLower() == "gif")

            {

                cp.ImgFormat = "gif";

            }

            else

            {

                cp.ImgFormat = "png";

            }

            return cp;

        }

        /// <summary>

        /// Encode the content with desired parameters and save the generated Matrix

        /// </summary>

        /// <returns>True if the encoding succeeded, false if the content is empty or too large to fit in a QR code</returns>

        public bool TryEncode()

        {

            var encoder = new QrEncoder(Ecl);

            QrCode qr;

            if (!encoder.TryEncode(Content, out qr))

                return false;

            Matrix = qr.Matrix;

            return true;

        }

        /// <summary>

        /// Render the Matrix as a PNG image

        /// </summary>

        /// <param name="ms">MemoryStream to store the image bytes into</param>

        internal void Render(MemoryStream ms)

        {

         

           // var render = new GraphicsRenderer(new FixedModuleSize(ModuleSize, QuietZones));   

          

                //test

            var renderer = new GraphicsRenderer(new FixedCodeSize(ImgSize, QuietZoneModules.Two), Brushes.Black, Brushes.White);

             // var renderer = new GraphicsRenderer(new FixedCodeSize(400, QuietZoneModules.Zero), Brushes.Black, Brushes.White);

             // renderer.WriteToStream(qrCode.Matrix, ImageFormat.Png,/*output*/);

            // close test

                //

            if (ImgFormat == "png")

            {

               // render.WriteToStream(Matrix, ImageFormat.Png, ms);

                renderer.WriteToStream(Matrix, ImageFormat.Png, ms);

                ContentType = "image/png";

            }

            else if (ImgFormat == "gif")

            {

               // render.WriteToStream(Matrix, ImageFormat.Gif, ms);

                renderer.WriteToStream(Matrix, ImageFormat.Png, ms);

                ContentType = "image/gif";

            }

            else if (ImgFormat == "jpeg")

            {

               // render.WriteToStream(Matrix, ImageFormat.Jpeg, ms);

                renderer.WriteToStream(Matrix, ImageFormat.Png, ms);

                ContentType = "image/jpeg";

            }

        }

        public static bool TryParse<TEnum>(string value, out TEnum result)

        where TEnum : struct, IConvertible

        {

            var retValue = value == null ?

                        false :

                        Enum.IsDefined(typeof(TEnum), value);

            result = retValue ?

                        (TEnum)Enum.Parse(typeof(TEnum), value) :

                        default(TEnum);

            return retValue;

        }

    }

     

WebConfig 

<?xml version="1.0"?>

<!--

    Note: As an alternative to hand editing this file you can use the

    web admin tool to configure settings for your application. Use

    the Website->Asp.Net Configuration option in Visual Studio.

    A full list of settings and comments can be found in

    machine.config.comments usually located in

    \Windows\Microsoft.Net\Framework\v2.x\Config

-->

<configuration>

        <configSections>

               <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">

                       <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">

                              <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>

                              <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">

                                      <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/>

                                      <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>

                                      <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>

                                      <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>

                              </sectionGroup>

                       </sectionGroup>

               </sectionGroup>

        </configSections>

        <appSettings/>

        <connectionStrings/>

        <system.web>

               <!--

            Set compilation debug="true" to insert debugging

            symbols into the compiled page. Because this

            affects performance, set this value to true only

            during development.

        -->

               <compilation debug="true">

                       <assemblies>

                              <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

                              <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

                              <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

                              <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

                       </assemblies>

               </compilation>

               <!--

            The <authentication> section enables configuration

            of the security authentication mode used by

            ASP.NET to identify an incoming user.

        -->

               <authentication mode="Windows"/>

               <!--

            The <customErrors> section enables configuration

            of what to do if/when an unhandled error occurs

            during the execution of a request. Specifically,

            it enables developers to configure html error pages

            to be displayed in place of a error stack trace.

        <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">

            <error statusCode="403" redirect="NoAccess.htm" />

            <error statusCode="404" redirect="FileNotFound.htm" />

        </customErrors>

        -->

               <pages>

                       <controls>

                              <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

                              <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

                       </controls>

               </pages>

               <httpHandlers>

                       <remove verb="*" path="*.asmx"/>

                       <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

                       <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

                       <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>

               </httpHandlers>

               <httpModules>

                       <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

               </httpModules>

        </system.web>

        <system.codedom>

               <compilers>

                       <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">

                              <providerOption name="CompilerVersion" value="v3.5"/>

                              <providerOption name="WarnAsError" value="false"/>

                       </compiler>

                       <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" warningLevel="4" type="Microsoft.VisualBasic.VBCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">

                              <providerOption name="CompilerVersion" value="v3.5"/>

                              <providerOption name="OptionInfer" value="true"/>

                              <providerOption name="WarnAsError" value="false"/>

                       </compiler>

               </compilers>

        </system.codedom>

        <!--

        The system.webServer section is required for running ASP.NET AJAX under Internet

        Information Services 7.0.  It is not necessary for previous version of IIS.

    -->

        <system.webServer>

               <validation validateIntegratedModeConfiguration="false"/>

               <modules>

                       <remove name="ScriptModule"/>

                       <add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

               </modules>

               <handlers>

                       <remove name="WebServiceHandlerFactory-Integrated"/>

                       <remove name="ScriptHandlerFactory"/>

                       <remove name="ScriptHandlerFactoryAppServices"/>

                       <remove name="ScriptResource"/>

                       <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

                       <add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

                       <add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

               </handlers>

        </system.webServer>

        <runtime>

               <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

                       <dependentAssembly>

                              <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>

                              <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>

                       </dependentAssembly>

                       <dependentAssembly>

                              <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>

                              <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>

                       </dependentAssembly>

               </assemblyBinding>

        </runtime>

</configuration>


QRCode in asp.net



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Tuesday, October 22, 2013

Garbage collector technique in C#

Garbage collector technique in C#

Garbage collection is a nice feature of .NET. It prevents memory leakage. In this tutorial we will discuss about garbage collection in C# and how to use GC class to collect object.
Generally garbage collection technique is automotive process. Means no one need to call garbage collection program. When it finds that there is need for memory, it runs itself and removes unused object from memory.
Generally we know that, we write destructor to destroy the object which is created by constructor. Bur in .NET destructor not runs automatically. Let us see how it works.
using System;
using System.Collections;
using System.Globalization;
using System.Data.SqlClient;
using System.Data;
 
namespace Test1
{
   public class Garbage   {
          public Garbage()
          {
            Console.WriteLine("Reserve memory");
          }
          ~Garbage()
          {
              Console.WriteLine("Free memory");
          }
 
   }
    class Program    {
        static void Main(string[] args)
        {
 
            {
                Garbage g = new Garbage();
  g = null;
 
            }
            Console.ReadLine();
        }
    }
}
 
Garbage collector technique in C#
Use GC.Collect to free memory
If we want to free all unused object from memory, we call garbage collector explicitly using GC.collect() method. Here is GC is garbage collector class. In below example we are removing all unused object from memory using GC.collect() .
using System;
using System.Collections;
using System.Globalization;
using System.Data.SqlClient;
using System.Data;
 
namespace Test1
{
   public class Garbage   {
          public Garbage()
          {
            Console.WriteLine("Reserve memory");
          }
          ~Garbage()
          {
              Console.WriteLine("Free memory");
          }
 
   }
    class Program    {
        static void Main(string[] args)
        {
 
            {
                Garbage g = new Garbage();
                g = null;
                GC.Collect();
            }
            Console.ReadLine();
        }
    }
}
  Garbage collector technique in C#
Memory free before and after collection
If we want we can measure how much memory got free after garbage collection using GetTotalMemory() function of GC class. Have a look on below example.
using System;
using System.Collections;
using System.Globalization;
using System.Data.SqlClient;
using System.Data;
 
namespace Test1
{
   public class Garbage   {
          public Garbage()
          {
            Console.WriteLine("Reserve memory");
          }
          ~Garbage()
          {
              Console.WriteLine("Free memory");
          }
 
   }
    class Program    {
        static void Main(string[] args)
        {
 
                
                Garbage g = new Garbage();
                g = null;
                Console.WriteLine("Total memory before free: - " +   GC.GetTotalMemory(false));
                GC.Collect();
                Console.WriteLine("Total memory before free:- " +   GC.GetTotalMemory(false));
            
         Console.ReadLine();
        }
    }
}
 
 
Garbage collector technique in C# 

 Source: http://dotnetfunda.com/articles/show/2400/prevent-sql-injection-in-csharp

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