Read XML element using ReadContentAsBinHexl

Question

4.00/5 (1 vote)

See more:

VS2010

Hi guys!
Big problem, small question.
So I'm working with xml. I create xml and one of the element is byte array.
I convert image to byte[]. Vs2010 create .xml I open it and everyting if fine. A have a long byte array (~30000 char).

Code snipet -> (item is struc)

MIDL

xmlWriter.WriteStartElement("PictureByteArray");
byte[] bytePicArray = imageToByteArray(item.picture);
 xmlWriter.WriteBinHex(bytePicArray, 0, bytePicArray.Length);

C#

private byte[] imageToByteArray(Image img)
       {
           using (MemoryStream ms = new MemoryStream())
           {
               img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
               return ms.ToArray();
           }
       }

The problem is How can I now read from saved xml file that byte array????
I trying to use ->
XmlReader.ReadContentAsBinHex Method

but no luck. I don't understand. Can someone give me some advice???
Thanks. :)

Posted 16-Jun-11 3:07am

valza

Add a Solution

3 solutions

Solution 3

Why working at the low level of XmlWriter/XmlReader?

You can better of using Data Contract.

See:
http://msdn.microsoft.com/en-us/library/ms733127.aspx[^].

I advocated this great approach in my past solutions. Please see:
How can I utilize XML File streamwriter and reader in my form application?[^],
Creating a property files...[^].

—SA

Posted 16-Jun-11 8:56am

Sergey Alexandrovich Kryukov

Comments

Espen Harlinn 16-Jun-11 17:29pm

Sensible approach, easy to implement - my 5

Sergey Alexandrovich Kryukov 16-Jun-11 21:26pm

Thank you, Espen.
--SA

Solution 1

Hello Dear
some time a go I was working on A WPF-WCF Chat application , i wanted to save user information in a XML File at server side . user information includes user name , user family , user image and etc . to save and retrieve these information in a XML file i did easiest way : using DataSet and DataTable .
dataset has some usefull method formworking on XML

DataSet Dset = new DataSet();
Dset.ReadXml("FilePath");
Dset.ReadXmlSchema("FilePath");
Dset.WriteXml("FilePath");
Dset.WriteXmlSchema("FilePath");

DataTable Dtable = new DataTable();
Dtable.ReadXml("FilePath");
Dtable.ReadXmlSchema("FilePath");
Dtable.WriteXml("FilePath");
Dtable.WriteXmlSchema("FilePath");

i could save and retrieve data including image file , from XML file easily

use this methods , it works
Good Luck

Posted 16-Jun-11 3:53am

Reza Mansoori

Comments

Sergey Alexandrovich Kryukov 16-Jun-11 14:58pm

Not sure...
I think my approach is better, please see my solution.
--SA

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Wayne Gaylard · Accepted Answer · 2011-06-16T04:25:00

I would convert my byte array into Base64 and then serialize the base64 string to xml, something like this

C#

void SavePic()
       {

           Image img = Image.FromFile("ID001.jpg");
           using (MemoryStream ms = new MemoryStream())
           {
               img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
               byte[] picArray = ms.ToArray();
               string picString = Convert.ToBase64String(picArray);
               XmlWriter writer = XmlWriter.Create("pic.xml");
               writer.WriteStartDocument();
               writer.WriteStartElement("pic");
               writer.WriteBase64(picArray,0, picArray.Length);
               writer.WriteEndElement();
               writer.WriteEndDocument();
               writer.Close();
           }
       }

then to retrieve the image you do something like this (Convert.FromBase64String being the operative here)

C#

void ViewPic()
        {
            var x = XDocument.Load("pic.xml");
            string s = (string)x.Descendants("pic").First();
            byte[] imageBytes = Convert.FromBase64String(s);
            MemoryStream ms = new MemoryStream(imageBytes);
            pictureBox1.Image = Image.FromStream(ms, true);
        }

Hope this helps