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How do I convert a byte array into XML file?

Posted on 2007-11-14
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Last Modified: 2012-06-21
I have a column of data in SQL that is stored as an image/binary data type but it is an XML file.  I can retrieve from SQL and create a byte array.  How do I take that byte array and convert back into an XML file
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Question by:Jtriolo
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by:James Murrell
ID: 20283256
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Expert Comment

by:Aurora27
ID: 20283372
Using the MemeoryStream object is the best way to do it - Never convert it into a string and then write it - it will truncate it.
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Author Comment

by:Jtriolo
ID: 20283442
OK, I'm using ADO and bringing in the data into a dataset and then taking the column and converting into a byte array as follows:

byte[] ba = (byte[])ds.Tables["Images"].Rows[0]["ImgData"];
 MemoryStream ms = new MemoryStream(ba, true);
                ms.Write(ba, 0, ba.Length);

I'm lost after this.  I have other columns that I am having no problem converting into .jpg....
What code do I use to write the Memory stream into an XML file on the hard drive?

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by:James Murrell
ID: 20283497
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by:Jtriolo
ID: 20283545
should I not be using a memory stream?
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by:James Murrell
ID: 20283681
I am unsue sorry
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by:Jtriolo
ID: 20283924
OK I figured it out.......  As I said before,  used ADO and brought the data into a dataset and then took the column and converted into a byte array as follows:

 byte[] ba = (byte[])ds.Tables["Images"].Rows[0]["OldXML_Data"];

            if (ba.Length > 0)
            {
                MemoryStream ms = new MemoryStream(ba, true);
                ms.Write(ba, 0, ba.Length);
                FileStream fs = new FileStream(@"C:\MyXML.xml", FileMode.Create);
                fs.Write(ba, 0, ba.Length);
                ms.Close();
            }

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by:James Murrell
ID: 20283969
great well done... shame i could not offer more
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Snarf0001 earned 500 total points
ID: 20285247
Code is fine, just one thing.  If you actually want to write the file to disk, then there's no need to have the memory stream in there, you're just writing the byte[] data into 2 different streams, the ms and the fs (you also need to close the FileStream).

byte[] ba = (byte[])ds.Tables["Images"].Rows[0]["OldXML_Data"];

            if (ba.Length > 0)
            {
                FileStream fs = new FileStream(@"C:\MyXML.xml", FileMode.Create);
                fs.Write(ba, 0, ba.Length);
                fs.Close();
            }


The only reason to use the memory stream, is if you just want to load the data into an XmlDocument variable or something like that, and not actually write it to disk.
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Author Comment

by:Jtriolo
ID: 20292668
I know I realized after that I didn't need the 2 lines of code for the memory stream, etc....   Thanks all!!!
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