VerySimpleXML 2.0 – a lightweight, cross-platform, one-unit XML reader/writer for Delphi 2010 – 10.1 Berlin

There are lot of possibilities if you’re in need to parse or write XML files:

Now here comes another one: the updated VerySimpleXML 2.0 – a lightweight, cross-platform, one-unit XML reader/writer for Delphi 2010 – 10.1 Berlin targeting at Win32, Win64, iOS, MacOSX and Android. Use it for well-formed XML files (like configuration files, interprocess communication protocols, etc.).

Download current version at GitHub

VerySimpleXML 2.0 is still open sourced and open for anyone to participate in the further development.

What’s new in version 2.0?

  • Support for these nodes types: ntElement (default node type), ntComment (comment nodes), ntDocType (Document Type Definition, but not parsed/evaluated), ntText (text only nodes), ntCData (CDATA sections), ntProcessingInstr (processing instructions)
  • Windows 32 bit, Windows 64 bit, Mac OSX, iOS and Android compatible
  • Support for headless xml files
  • Reduced memory consumption
  • Allows now processing of large xml files without line breaks
  • Node content is now read exactly as found (including line breaks)
  • Case sensitive/insensitve node and attribute name handling (use doCaseInsensitive option)
  • Write UTF-8 files with or without BOM (doWriteBOM option)
  • Support for attributes without values (single attribute type)
  • Support for the Delphi “nextgen compiler” and weak references for ARC
  • Added a lot of TXMLDocument compatible methods
  • Support for parsing the ntProcessingInstr nodes (processing instructions)
  • Support for Windows, Unix and even custom line breaks
  • Improved fluent interfaces

What’s the difference between version 1.x and version 2.0?

a) Root and Header nodes
There is no XmlDoc.Root element any more (it’s still there but hidden in the private declarations part) because it’s renamed to XmlDoc.DocumentElement to be more TXMLDocument compatible and it’s not created by default now.

Old version 1.0

New version 2.0

You may have noticed that Node.Attribute['someattrib'] is now renamed to Node.Attributes['someattrib'] as well.

The above example still works by using fluent interfaces:

or even written as a one liner : -)

The next gen compiler hints “H2593: code has no effect”, so you may omit the last .Free

b) Last line break
As VerySimpleXML 2.0 operates now on read and write buffers instead of string lines, it omits the last line break of a xml file when written.

How to upgrade to version 2.0?

  • Replace VerySimpleXml.pas with the new VerySimpleXml.pas
  • Replace Xml.Root.NodeName assignments with Xml.AddChild
  • Replace Node.Attribute[] with Node.Attributes[]

Come on – yet another XML parser?

About 3 years ago I was in a need for parsing some xml files, so I’ve started using TXMLDocument. But because it was a little bit slow, I’ve decided to write my own very simple xml parser (hence the name) because I couldn’t find an easy to use, “unbloated” xml component. VerySimpleXML was done in about two afternoons  – I’m good in writing parsers ; -)  and is still used in a lot of projects. At the end of last year I’ve upgraded to Delphi XE5 and startet porting the xml parser to the next gen compiler. And added a lot more features – mainly support for different node types like comments and cdata. VerySimpleXML is not “feature-complete”, nor is it the fastest delphi xml parser found (but still faster than TXmlDocument) – it is just a small and simple parser for small and simple xml files. If you need something more versatile, I highly recommend OXml – The next generation XML library for Pascal written by Ondřej Pokorný (the same author who updated and bug fixed the great OmniXML component) which even runs with Delphi 6 and FPC, Lazarus and C++Builder.

Found a bug or need help?

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27 Comments to VerySimpleXML 2.0 – a lightweight, cross-platform, one-unit XML reader/writer for Delphi 2010 – 10.1 Berlin

Paul Werner
October 13, 2014

Well done! A really nice piece of sw.

Dennis
October 23, 2014

Thank you for your bug reports!

tony
November 1, 2014

program Example6 for xe6

error line:
// Process child nodes
for Child in Node.ChildNodes do
Walk(Writer, Indent, Child);

Dennis
November 4, 2014

Thanks, Example 6 fixed

Hex
December 17, 2014

Waiting 3.0 implements DOM Vender

Dennis
December 31, 2014

thanks for the feature proposal

Tzu-Yuan Lin
March 18, 2015

Thank you.

Wes
March 20, 2015

What a sweet piece of code! Thanks so much.

On a regular basis, my application will “import” data from an XML file, massage it some, and move it into a few database tables.

Of all the XML parsers I tried, yours was the absolute easiest to use.

This isn’t necessary, of course, but if TXmlVerySimple fired an event each time a node was visited I could probably simplify my code even more. (If it already does, please forgive me for not studying your code.)

Best regards

Robin
April 16, 2015

What about a tool like the delphi xml wizard only better and cleaner? The acutal version of it isnt usable

Robin
April 17, 2015

How to add prefixes and namespaces?

Philippe Watel
July 9, 2015

Any chance to have this wonderful code ported over lazarus/free pascal?
Although a old Delphi practitioner, I am just a beginner in lazarus – it is above my skill level
Thank you

jamesg
July 15, 2015

Any chace to include some Simple features?
Node prefixes and namespaces
On savefile, Empty nodes like
parameter to save xml in one single line

thanks 🙂

jamesg
July 15, 2015

ups sorry for the request, I found the doCompact option

LucasB
October 19, 2015

Hi,
How to install the VerySimpleXML in Delphi XE7?
Thanks.

dennis
October 20, 2015

@LucasB, you don’t need to “install” anything, just copy the VerySimpleXML.pas to your source directory (or adjust your search path settings) – see the included examples

Umberto
February 5, 2016

Hi, i use you verysimpleXML, but it’s very slow when it write the file xml is it normal?
thanks

boz
March 10, 2016

Nice piece of code, if a bit difficult for an old school pascal programmer to understand

If I use the .xml or .text property of the XML (so I can save in DB memo field) there is a ? processing character at the first position and most other XML parsers ignore the text. I remove this manually but is there a proper way?

UweH
May 19, 2016

Dennis, due to the code breaking change in DX 10.1 Berlin private variables are no more visible to class helpers so VerySimpleXML does not compile anymore.
I was very happy to find this cute XML component for android projects. Do you plan to revise the software for 10.1 and future delphi releases?

Dennis D. Spreen
May 25, 2016

I’ll update it soon

Lee B
May 24, 2016

UweH if your desperate and can not be bothered to work it out you could take a complete copy of TStreamreader and rename it to TMyStreamReader make the private variables public then change the places in xml.verysimple to use your new streamreader instead off delphi’s. The alternative would be to manipulate the stream (basestream) to mimic what Dennis was doing with it in the helper class.

UweH
May 26, 2016

Good news Dennis. Thanks in advance. I’m really looking forward.

Dennis D. Spreen
May 26, 2016

here is just a fix hack accessing the private fields with the rtti, it is slow but should work. I need to completely rewrite the code, but in the meantime you may try this “beta”:
http://blog.spreendigital.de/wp-content/uploads/2016/05/Xml.VerySimple.2.0.2.beta_.zip
DONT USE THIS BETA, IT WON’T WORK WITH LARGE FILES! Please use the official v2.0.2

Dennis D. Spreen
June 15, 2016

Please find current v2.0.2 at Github (see link on top), I’ve dropped the helper class and replaced it with an TXmlStreamreader class which gets the TStreamReader methods by RTTi in the constructor.

neptune hsu
June 24, 2016

Hello Dennis:

At First. Thanks for the code. I am a c++ builder user. The 2.0.2 beta was work for c++ builder too. Thank you.

I’ve got a exception when I used

XmlObj->Text= Memo1->Text; ( Memo1->Text was xml type words. )

The Exception fired when the xml size is big. ( I forgot to count the size of it. )
My delphi was not good enough, so, maybe what i did was not the good way.

——— original ———-
procedure TXmlVerySimple.SetText(const Value: String);
var
Stream: TStringStream;
begin
Stream := TStringStream.Create(”, TEncoding.UTF8);
try
Stream.WriteString(Value);
Stream.Position := 0;
LoadFromStream(Stream);
finally
Stream.Free;
end;
end;

———- modified ————-
procedure TXmlVerySimple.SetText(const Value: String);
var
Stream: TStringStream;
begin
Stream := TStringStream.Create(”, TEncoding.UTF8);
try
Stream.WriteString(Value);
Stream.Position := 0;
LoadFromStream(Stream,Stream.size+1); // <——– modified here
finally
Stream.Free;
end;
end;

neptune hsu
June 24, 2016

Hello Dennis

I’v try the new v2.0.2 that you update few days ago on github.
The exception was not fired when SetText.

thank you.

Dennis D. Spreen
June 24, 2016

what you did here is to set the buffer size larger than your input stream. the 2.0.2 beta tried to call the FillBuffer of the original TStream via RTTi if the stream hits the length but this RTTi call didn’t work (it returned NIL) because of not accessible private methods with 10.1 Berlin (see http://stackoverflow.com/questions/37874351/how-to-access-the-private-method-tstreamreader-fillbuffer-in-delphi-10-1-berlin) which I didn’t noticed. This was fixed in the 2.0.2 “not beta” – so don’t use the beta
😉

Mohammad Zabihmand
December 6, 2016

How do i can remove a node by index and save it

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About Dennis D. Spreen

I'm an avid programmer working on a variety of platforms in a variety of languages with a wide technical interest.

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