使用ReadContentAsBinHexl读取XML元素 [英] Read XML element using ReadContentAsBinHexl

问题描述

大家好！
大问题，小问题.
所以我正在使用xml.我创建了xml，其中一个元素是字节数组.
我将图像转换为byte []. Vs2010 create .xml我打开它，并且一切正常. A有一个长字节数组(〜30000个字符).

代码片段-> (项目是结构)

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)

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

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

问题是我现在如何才能从保存的xml文件中读取该字节数组????
我尝试使用->
XmlReader.ReadContentAsBinHex方法

但没有运气.我不明白有人可以给我一些建议吗???
谢谢. :)

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. :)

推荐答案

为什么在XmlWriter/XmlReader的较低级别上工作?

您可以更好地使用数据合同.

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

我在过去的解决方案中主张采用这种出色的方法.请参阅:
如何在我的表单应用程序? [ ^ ]，
创建属性文件... [

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

我会将字节数组转换为Base64，然后将base64字符串序列化为xml，就像这样

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

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();
           }
       }

然后要检索图像，您可以执行以下操作(Convert.FromBase64String在这里是可操作的)

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

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);
        }

希望这对您有帮助

Hope this helps

您好亲爱的
一段时间以来，我正在研究WPF-WCF聊天应用程序，我想将用户信息保存在服务器端的XML文件中.用户信息包括用户名，用户系列，用户图片等.我最简单的方法是将数据保存和检索到XML文件中:使用DataSet和DataTable.
数据集在XML上有一些有用的方法形成形式

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");

我可以轻松地从XML文件保存和检索包括图像文件在内的数据

使用这种方法，就可以了
祝你好运

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

use this methods , it works
Good Luck

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