EldoS | Feel safer!

Software components for data protection, secure storage and transfer

XML escape characters in attributes .NET

Also by EldoS: CallbackRegistry
A component to monitor and control Windows registry access and create virtual registry keys.
Posted: 05/23/2011 08:40:01
by Matthias Pr (Basic support level)
Joined: 05/23/2011
Posts: 3


we're trying to parse some XML from a string which has some escaped characters in it. For testing purposes I wrote the following code which could illustrate the problem.

TElXMLDOMDocument xml = new TElXMLDOMDocument();

MemoryStream m = new MemoryStream();
StreamWriter s;
s = new System.IO.StreamWriter(m, new System.Text.ASCIIEncoding());

s.Write("<?xml version='1.0' ?>\n<ROOT a='Hello&#xA;&#xD;World'></ROOT>");
m.Seek(0, SeekOrigin.Begin);


TElXMLDOMAttr attr = (TElXMLDOMAttr) xml.DocumentElement.Attributes.get_Item(0);


Unfortunately the program does not seem to be able to properly handle the escaped characters. Instead of a line break the program output is just


I have already tried different encodings (both in the XML header and as a replacement for the ASCIIEncoding). (This is probably correct anyway as I can inspect attr.OuterXML with the value : "a='Hello World'")

Is there a different way to get the value of the attribute?

.NET 4.0
SecureBlackBox Version
SecureBlackBox XML
Visual Studio 2010 SP1
Posted: 05/23/2011 09:53:34
by Dmytro Bogatskyy (EldoS Corp.)

There is a bug in a getter of ElXMLDOMAttr.NodeValue/Value property in processing numeric character entities. It is fixed for the next build. Unfortunately, there is no simple way to output a correct attribute value without NodeValue property, you will need to process all attribute childs (for text nodes and entities) and build a string value. If you need a sample let me know.
Thank you for pointing this.
Posted: 06/08/2011 07:32:57
by Matthias Pr (Basic support level)
Joined: 05/23/2011
Posts: 3

Just installed the new version, despite the change notes I'm still having problems with NodeValue - this time seen in the VCL version...

var s : TMemoryStream;
    xml : TElXMLDOMDocument;
    attr : TElXMLDOMAttr;

    s := TMemoryStream.Create;

    xml := TElXMLDOMDocument.Create;

    attr := TElXMLDOMAttr(xml.DocumentElement.Attributes.Item[0]);


    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);



SecureBlackbox - version 9.0.202
Embarcadero® Delphi® XE Version 15.0.3890.34076
Posted: 06/08/2011 08:19:26
by Dmytro Bogatskyy (EldoS Corp.)

That's strange.
Possible some old dcu's are left.
What does the following code return:
Posted: 06/08/2011 08:23:34
by Matthias Pr (Basic support level)
Joined: 05/23/2011
Posts: 3
Posted: 06/08/2011 12:10:16
by Dmytro Bogatskyy (EldoS Corp.)

Unfortunately, the version of SecureBlackbox package for Delphi 2009, 2010 and XE is left 9.0.201, due to a bug in the build process.
The new version (203 build) is expected at this weekends, so we don't plan to replace a current package at the moment, sorry.
Thank you for pointing this.
Posted: 06/12/2011 08:41:57
by Eugene Mayevski (EldoS Corp.)

JFYI: new build is available on the site.

Sincerely yours
Eugene Mayevski
Also by EldoS: CallbackFilter
A component to monitor and control disk activity, track file and directory operations (create, read, write, rename etc.), alter file data, encrypt files, create virtual files.



Topic viewed 1159 times

Number of guests: 1, registered members: 0, in total hidden: 0


Back to top

As of July 15, 2016 EldoS Corporation will operate as a division of /n software inc. For more information, please read the announcement.

Got it!