Insert XML string into Document

[S Wheeler]

Hi all -
I need some help trying to insert / append a block of xml text into an xml
document. This is for a reporting app and as new data is available, I must
add it to the end of the document. It should be simple but I cannot seem to
find the magic combo. Here is what I am trying to do:

The XML String is periodically generated and indicates the results of a
system test. The File is the Log File and is opened and a new XmlDocument is
created using the Log File FileStream. I want to insert / append the XML
string in the ResultsLog Tags. I have tried a number of variations but can't
seem to hit the right approach. The XML string is generated internally and
cannot be changed. Any suggestions are appreciated.
// Open the stream and read it back.

FileStream* fs = File::Open(sTestLogFile, FileMode::OpenOrCreate,
FileAccess::ReadWrite, FileShare::None);

XmlDocument* xmlReport = new XmlDocument;

xmlReport->Load(fs);
XML file:

<?xml version="1.0"?>
<ResultsLog>
</ResultsLog>

XML String:

<TestResults>
<Description>Unit number 2</Description>
<Tests>
<Test>
<Name type="string">REF to DUT Test</Name>
<Duration type="integer">40</Duration>
<Attenuation type="integer">70</Attenuation>
<Direction type="integer">0</Direction>
<MinRate type="integer">0</MinRate>
<MaxRate type="integer">200</MaxRate>
</Test>
<Test>
<Name type="string">REF to DUT Test</Name>
<Duration type="integer">40</Duration>
<Attenuation type="integer">71</Attenuation>
<Direction type="integer">0</Direction>
<MinRate type="integer">0</MinRate>
<MaxRate type="integer">200</MaxRate>
</Test>
<Test>
<Name type="string">REF to DUT Test</Name>
<Duration type="integer">40</Duration>
<Attenuation type="integer">72</Attenuation>
<Direction type="integer">0</Direction>
<MinRate type="integer">0</MinRate>
<MaxRate type="integer">200</MaxRate>
</Test>
</Tests>
</TestResults>

[Martin Honnen]

S Wheeler wrote:

FileStream* fs = File::Open(sTestLogFile, FileMode::OpenOrCreate,
FileAccess::ReadWrite, FileShare::None);

XmlDocument* xmlReport = new XmlDocument;

xmlReport->Load(fs);

pseudo code:
XmlDocumentFragment* fragment = xmlReport->CreateDocumentFragment();
fragment.InnerXml = stringGoesHere;
xmlReport->DocumentElement->AppendChild(fragment);
// now output or save back
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Dhanvanth]

Based on your description, what I get it that you want to insert the
XML string into the ResultsLog element. If that is the case then it is
pretty straightforward.

XmlReport.Load(fs);
XmlReport.DocumentElement.InnerXml+=<your xml string here>;
XmlReport.Save(<save stream>);
The above code is in C#. You can easily convert it into C++;

Note: This will work only if the xml string to be inserted is well
formed and valid. Else an XmlException will be thrown.

Also if ResultsLog is not your root element, then change the second
line to
XmlReports.SelectSingleNode(<XPath to ReportsLog node>).InnerXml

-Dhanvanth

[Martin Honnen]

Dhanvanth wrote:

XmlReport.Load(fs);
XmlReport.DocumentElement.InnerXml+=<your xml string here>;
XmlReport.Save(<save stream>); Note: This will work only if the xml string to be inserted is well
formed and valid. Else an XmlException will be thrown.

Validity is certainly not checked if you add to InnerXml or do other DOM
manipulations.

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[S Wheeler]

Thanks Martin -

That worked - sort of.... the appendchild seems to add another <?xml
version="1.0"?> and instead of my xml being inside of the
<ResultsLog></ResultsLog> tags it is in a new <ResultsLog></ResultsLog> tag
pair. Any ideas?
Thanks


"Martin Honnen" <ma*******@yahoo.de> wrote in message
news:en**************@TK2MSFTNGP05.phx.gbl...

S Wheeler wrote:

FileStream* fs = File::Open(sTestLogFile, FileMode::OpenOrCreate,
FileAccess::ReadWrite, FileShare::None);

XmlDocument* xmlReport = new XmlDocument;

xmlReport->Load(fs);

pseudo code:
XmlDocumentFragment* fragment = xmlReport->CreateDocumentFragment();
fragment.InnerXml = stringGoesHere;
xmlReport->DocumentElement->AppendChild(fragment);
// now output or save back
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[S Wheeler]

That seems to introduce a "<?xml version="1.0"?>" is there any way to
prevent this?
"Dhanvanth" <dh*******@gmail.com> wrote in message
news:11**********************@j33g2000cwa.googlegr oups.com...

Based on your description, what I get it that you want to insert the
XML string into the ResultsLog element. If that is the case then it is
pretty straightforward.

XmlReport.Load(fs);
XmlReport.DocumentElement.InnerXml+=<your xml string here>;
XmlReport.Save(<save stream>);
The above code is in C#. You can easily convert it into C++;

Note: This will work only if the xml string to be inserted is well
formed and valid. Else an XmlException will be thrown.

Also if ResultsLog is not your root element, then change the second
line to
XmlReports.SelectSingleNode(<XPath to ReportsLog node>).InnerXml

-Dhanvanth

[Martin Honnen]

S Wheeler wrote:

That worked - sort of.... the appendchild seems to add another <?xml
version="1.0"?> and instead of my xml being inside of the
<ResultsLog></ResultsLog> tags it is in a new <ResultsLog></ResultsLog> tag
pair. Any ideas?

Is there an <?xml version="1.0"?> in the snippet of XML you want to
insert? Your example did not have one and AppendChild will not create
such stuff. And it will not add a new ResultsLog element unless it has
been in the snippet of XML you parse. I read your original request as
that you simply want to insert everything you have in the string.
Here is an example (using C#):

XmlDocument xmlDocument = new XmlDocument();
xmlDocument.LoadXml(@"<ResultsLog />");
// output for test
xmlDocument.Save(Console.Out);
Console.WriteLine();
Console.WriteLine();

string exampleXML = @"<TestResults>
<Description>Unit number 2</Description>
<Tests>
<Test>
<Name type=""string"">REF to DUT Test</Name>
<Duration type=""integer"">40</Duration>
<Attenuation type=""integer"">70</Attenuation>
</Test>
</Tests>
</TestResults>";
XmlDocumentFragment fragment = xmlDocument.CreateDocumentFragment();
fragment.InnerXml = exampleXML;
xmlDocument.DocumentElement.AppendChild(fragment);

// output for test
xmlDocument.Save(Console.Out);

The complete output on the console is

<?xml version="1.0" encoding="utf-8"?>
<ResultsLog />

<?xml version="1.0" encoding="utf-8"?>
<ResultsLog>
<TestResults>
<Description>Unit number 2</Description>
<Tests>
<Test>
<Name type="string">REF to DUT Test</Name>
<Duration type="integer">40</Duration>
<Attenuation type="integer">70</Attenuation>
</Test>
</Tests>
</TestResults>
</ResultsLog>

so neither is any <?xml version="1.0"?> XML declaration added nor is
there any new ResultsLog element made up.

Maybe the original XML sample you showed is not what you finally used
but then you need to post what you have so that we can suggest the
proper code.

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Dhanvanth]

I agree. Well formedness was what i wanted to specify. Oversight on my
part to add validity there.