How to get wchar_t* from XSLTResultTarget, and ID transformation using Xalan?

Fri, 02 Feb 2007 12:37:46 -0800 

Hi, everyone!

I'm a new Xalan-C user and not familiar with C++.
I want to get wchar_t* from XSLTResultTarget of XalanTransformer.transform() in order to pass the pointer to other vendor library for creating the vendor original string object. So I have to write the XalanTransformer output to memory buffer. The string creating function of that library accept wchar_t* to create Unicode 
(UTF-16) string.
And I described "xsl:output encoding='UTF-16'" at my stylesheet.

I tried the following code, but it didn't work well.
My platform is IA32, OS is Windows XP Pro and IDE is Visual Studio 2003.

Please tell me some advices for my questions.
1. What kind of stream should I use to get output and pass the pointer easily? 

 A. Tried using ostringstream
   Transform done fine, but I can't get wcha_t*.
I observed the memory, and write fine. But I can't get string using str() 
   because the memory buffer include null byte(0x00). And I don't know
   how to get the memory buffer pointer directly, maybe it's a problem
   of my C++ skills...
But if this is better way, please tell me how to get the buffer pointer. 

 B. Tried using wostirngstream
   transform() returns 0(success), but the memory buffer was
   0xff 0xfe 0x00 0x00 0x3c 0x00 0x3f 0x00 ...
   I don't know why null code inserted after BOM.

C. Tried using XalanDOMString and PrintWriter
   because XSLTResultTarget accept Writer class object.
   But, when I executed transform(), I encounterd the assertion
   "npos == 0 | ..."
   What's wrong? Not enough initializing?
[Snippet code] // Xerces and Xalan initialization 

 // XSLTInputSource source
 // XSLTInputSource stylesheet (xsl:output encoding='UTF-16')

(A. Tried using ostringstream)
 ostringstream resultBuf;
 XSLTResultTarget result(resultBuf);

(B. Tried using wostringstream)
 wostringstream resultBufW;
 XSLTResultTarget result((XSLTResultTarget::StreamType&)resultBufW);

(C. Tried using XalanDOMString and PrintWriter)
 XalanDOMString domStr;
 DOMStringPrintWriter domSPW(domStr);
 XSLTResultTarget result(&domSPW);

 XalanTransformer transformer;
 int theResult = -1;
 theResult = transformer.transform(source, stylesheet, result);

 // Xalan and Xerces termination


2. Above code is a part of a porting from Java identity transformation
 such like following:

something.java
 import javax.xml.transform.Result;
 import javax.xml.transform.Source;
 import javax.xml.transform.Transformer;

 public void doTransform(Source source, Result result)
       throws TransformerException {
   TransformerFactory factory = createTransformerFactory();
Transformer transfomer = factory.newTransformer(); // <- Create ID transformer 
   transfomer.transform(source, result);
 }
I ported this code to following C++ code. Is it correct? or Is there other better way? 

#define IDENTITY_TRANSFORM_XSLT "<?xml version='1.0'?>\
<xsl:stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform' version='1.0'>\ 
<xsl:output encoding='UTF-16' />\
<xsl:template match='/'>\
<xsl:copy-of select='*' />\
</xsl:template>\
</xsl:stylesheet>"

int _tmain(int argc, _TCHAR* argv[])
{
 XMLPlatformUtils::Initialize();
 XalanTransformer::initialize();
 {
   (something code)

   XSLTInputSource inputSource( ** some input source **);

   const char* const  theStylesheet = IDENTITY_TRANSFORM_XSLT;
   istringstream theXSLStream(theStylesheet);
   const XSLTInputSource stylesheet(&theXSLStream);

   XSLTResultTarget result(resultBuf);

   XalanTransformer transformer;
   int theResult = -1;
   theResult = transformer.transform(parsedSource, stylesheet, result);

   (something code)
 }
}


I'm sorry a very long question, and sorry I'm not good at English.

Thank you.

Ken

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