Write transform output to a buffer

[Nithya Nirmal Vijayakumar]

Hi,

I am a new user to Xalan-C++. I want to apply xsl transformation to xml
stored in a buffer and get the output into a buffer.  The
StreamTransform.cpp example reads from a buffer and writes output to a
stream. I want to make this write to a buffer. I saw some discussion about
this in this group and tried following the advice of extending
Callbackhandler. But I am getting many compilation errors. Has anyone
already done this? Could you please post your code? Any help will be
greatly appreciated.

This is what I tried:

//Declaration of wrapper class
XALAN_USING_XALAN(XalanOutputStream)
class xalan_string_stream:public XalanOutputStream{
   private:
          char *output;
          char *buffer;
          unsigned cursor;
   public:
    xalan_string_stream(MemoryManagerType
 XALAN_DEFAULT_CONSTRUCTOR_MEMORY_MGR,
        size_type theBufferSize = eDefaultBufferSize,
        size_type theTranscoderBlockSize = eDefaultTranscoderBlockSize,
          bool fThrowTranscodeException = true){
      buffer=new char[1024];
    }

    ~xalan_string_stream(){}

    void writeData (const char *input, size_type length){
      bcopy(input,buffer,length);
    }

    void doFlush (){
    }

    char *get_result(){
      return buffer;
    }
 };

//usage inside main
        istrstream  theXMLStream(theInputDocument,
 strlen(theInputDocument));

        istrstream  theXSLStream(theStyleSheet, strlen(theStyleSheet));

        XALAN_USING_XALAN(XalanDOMString)
        XALAN_USING_XALAN(XalanOutputStreamPrintWriter)
        XALAN_USING_XALAN(XSLTResultTarget)
        XALAN_USING_XALAN(XSLTInputSource)

        XSLTInputSource inputSource(&theXSLStream);

        inputSource.setSystemId(XalanDOMString("foo").c_str());

        const xalan_string_stream *outputStream = new xalan_string_stream();

        XalanOutputStreamPrintWriter *printWriter=new
 XalanOutputStreamPrintWriter((XalanOutputStream &)outputStream, false);

        XSLTResultTarget target(printWriter);

        theResult = theXalanTransformer.transform(&theXMLStream,
 inputSource,target);

//compilation error obtained
 BufferTransform.cpp:40: base `xalanc_1_10::XalanOutputStream' with only
     non-default constructor in class without a constructor
 BufferTransform.cpp:54: ISO C++ forbids defining types within return type
 BufferTransform.cpp:54: destructors must be member functions
 BufferTransform.cpp:54: return type specification for destructor invalid
 BufferTransform.cpp:56: type specifier omitted for parameter `size_type'
 BufferTransform.cpp:56: syntax error before `)' token
 BufferTransform.cpp: In function `void writeData(...)':
 BufferTransform.cpp:57: `input' undeclared (first use this function)
 BufferTransform.cpp:57: (Each undeclared identifier is reported only once
 for each function it appears in.)
 BufferTransform.cpp:57: `buffer' undeclared (first use this function)
 BufferTransform.cpp:57: `length' undeclared (first use this function)
 BufferTransform.cpp: At global scope:
 BufferTransform.cpp:66: syntax error before `}' token
 BufferTransform.cpp: In function `int transform(const char*, char*)':
 BufferTransform.cpp:155: ISO C++ forbids declaration of
 `xalan_string_stream'
     with no type
 BufferTransform.cpp:155: uninitialized const `xalan_string_stream'
 BufferTransform.cpp:155: syntax error before `*' token
 BufferTransform.cpp:157: `outputStream' undeclared (first use this
 function)
 make: *** [all] Error 1


thanks,
Nithya