Reading binary in to a image : The Official Microsoft ASP.NET Forums

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Reading binary in to a image

Jun 30, 2012 05:28 PM|LINK

Hey, in my xml file there is a binary data,

i want to turn that data to an image using a generic handler.

nothing i do works so i have uploaded the entire project, maybe you guys can

see if you can come up with some solutions ;)

http://www.tinyuploads.com/download/file/dXNBz0 (check out line 34 in Default.aspx.cs file)

Edited by eladc on Jul 01, 2012 07:55 AM

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Re: Reading binary in to a image

Jul 02, 2012 02:00 AM|LINK

eladc
eladc

Well……It would be better if you can paste your solution in the form of zip，for Microsoft support at present only use zip files……

I think that in fact you can do a class to serialize it in the form of xml，and then read the whole xml contents in and then read out the image bytes and use HttpHandler to deal with the image problem……

For more you can see this：

http://forums.asp.net/t/1733946.aspx/1

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eladc

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32 Points

89 Posts

Re: Reading binary in to a image

Jul 02, 2012 11:27 AM|LINK

zip: http://www.tinyuploads.com/download/file/rmn6vQ

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Decker Dong ...

All-Star

118619 Points

18779 Posts

Re: Reading binary in to a image

Jul 03, 2012 01:50 AM|LINK

Well……You should create an entity model class and the serialize or deserialize it step by step, and then with the help of httphandler, you can fetch the bytes of image out。

Please follow the example——If you need the sample，please leave your email here……

[aspx]

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="CSharp.WebForm1" %>

<!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></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Repeater ID="Repeater1" runat="server">
            <HeaderTemplate>
                <table>
                    <tr>
                        <th>Id</th>
                        <th>Name</th>
                        <th>Image</th>
                    </tr>
            </HeaderTemplate>

            <ItemTemplate>
                <tr>
                    <td><%#Eval("Id") %></td>
                    <td><%#Eval("Name") %></td>
                    <td>
                        <img src='Imagehandler.ashx?Id=<%#Eval("Id") %>' width="120" height="120" />
                    </td>
                </tr>
            </ItemTemplate>
            <FooterTemplate>
                </table>
            </FooterTemplate>
        </asp:Repeater>
    </div>
    </form>
</body>
</html>

[Httphandler]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace CSharp
{
    /// <summary>
    /// Summary description for Imagehandler
    /// </summary>
    public class Imagehandler : IHttpHandler
    {
        private static List<EntityModel> models = null;
        static Imagehandler()
        {
            models = Dbgenerator.ReadFromXml();
        }

        public void ProcessRequest(HttpContext context)
        {
            context.Response.Clear();
            context.Response.ContentType = "image/jpeg";
            int id = Convert.ToInt32(context.Request.QueryString["Id"]);
            id--;
            context.Response.BinaryWrite(models[id].Image);
            context.Response.End();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

[EntityModel]

namespace CSharp
{
    /// <summary>
    /// A model entity that used to hold data contents
    /// </summary>
    [Serializable]
    public class EntityModel
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public byte[] Image { get; set; }
    }

    /// <summary>
    ///A class that is used to create random records to be like fetching contents from a db 
    /// </summary>
    public static class Dbgenerator
    {
        private static List<EntityModel> entities = new List<EntityModel>();

        static Dbgenerator()
        {
            entities.Add(new EntityModel { Id = 1, Name = "member1", Image = System.IO.File.ReadAllBytes("c:\\Koala.jpg") });
            entities.Add(new EntityModel { Id = 2, Name = "member2", Image = System.IO.File.ReadAllBytes("c:\\Chrysanthemum.jpg") }); 
        }
        /// <summary>
        /// Write xml into hard disc C
        /// </summary>
        public static void WriteGenerateInXml()
        {
            XmlSerializer xs = new XmlSerializer(typeof(List<EntityModel>));
            FileStream fs = new FileStream("c:\\dataxml.xml", FileMode.OpenOrCreate);
            xs.Serialize(fs, entities);
            fs.Close();
        }
        /// <summary>
        ///  Read out from xml file
        /// </summary>
        public static List<EntityModel> ReadFromXml()
        {
            XmlSerializer xs = new XmlSerializer(typeof(List<EntityModel>));
            FileStream fs = new FileStream("c:\\dataxml.xml", FileMode.OpenOrCreate);
            List<EntityModel> models = xs.Deserialize(fs) as List<EntityModel>;
            fs.Close();
            return models;
        }
    }
}