[fpc-pascal] XML Iteration

[Luiz Americo Pereira Camara]

Lee Jenkins escreveu:
> Frank Church wrote:
>> I am having some problems with XPath.
>>
>> EvaluateXPathExpression raises exceptions with some search strings 
>> and I am not sure if it is my limited knowledge of XPath, or a buggy 
>> XPath implementation.
>>
>> The attached demo uses the example from 
>> http://www.w3schools.com/xpath/xpath_examples.asp and I am running 
>> 0.9.28.2 beta on Windows
>>
>>
>
> I'm trying to put together a simple test application for xpath now and 
> I've noticed, there doesn't seem to be a way in fpc xml implementation 
> to simply save to a string, an xml document or node.
>
> ReadXML()
> ReadXMLFile()
>
> All have no implementation to write a value to a string, only Text, 
> Stream and File.  I have to create an intermediary stream, save it to 
> that and then convert that to string or use TStringStream in order to 
> convert them to a string.  Odd.

>
> Also the wiki page:
> http://wiki.freepascal.org/XML_Tutorial#Create_a_TXMLDocument_from_a_string 
>

May be this can help you:

procedure Str2XmlFile(var XmlTree: TXMLDocument; const S: String);
var
  Stream: TStringStream;
begin
  Stream := TStringStream.Create(S);
  try
    ReadXmlFile(XmlTree, Stream);
  finally
    Stream.Destroy;
  end;
end;

Luiz
>
> Is incorrect.  The example will error out because the string passed in 
> is interpreted as a file path, not as a string representation of an 
> xml document.
>
> -- 
> Warm Regards,
>
> Lee
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