RE: How to parse a buffer with Xercesc

[Sobieski, Scott M]

It seems like what you're saying is the only way to parse a buffer is to
write it to a file.  Am I correct in this assumption?

Scott

-----Original Message-----
From: Scott Cantor [mailto:[EMAIL PROTECTED]
Sent: Tuesday, January 13, 2004 2:49 PM
To: [EMAIL PROTECTED]
Subject: RE: How to parse a buffer with Xercesc


> I've looked at MemParse and it gives you general information, 
> but I want the actual node information and data.  I have a 
> parser that parses a file, but now I need to parse a buffer, 
> i.e. a char*.  

I use a stream& input source for C++, but it should generalize.

-- Scott


        class StreamInputSource : public InputSource
        {
        public:
            StreamInputSource(std::istream& is, const char*
systemId=NULL) :
InputSource(systemId), m_is(is) {}
            virtual BinInputStream* makeStream() const { return new
StreamBinInputStream(m_is); }

        private:
            std::istream& m_is;

            class StreamBinInputStream : public BinInputStream
            {
            public:
                StreamBinInputStream(std::istream& is) : m_is(is),
m_pos(0)
{}
                virtual unsigned int curPos() const { return m_pos; }
                virtual unsigned int readBytes(XMLByte* const toFill,
const
unsigned int maxToRead);
            private:
                std::istream& m_is;
                unsigned int m_pos;
            };
        };

unsigned int StreamInputSource::StreamBinInputStream::readBytes(XMLByte*
const toFill, const unsigned int maxToRead)
{
    XMLByte* target=toFill;
    unsigned int bytes_read=0,request=maxToRead;

    // Fulfill the rest by reading from the stream.
    if (request)
    {
        try
        {
            m_is.read(reinterpret_cast<char* const>(target),request);
            m_pos+=m_is.gcount();
            bytes_read+=m_is.gcount();
        }
        catch(...)
        {
            cerr << "StreamInputSource::StreamBinInputStream::readBytes
caught an exception" << endl;
            *toFill=0;
            return 0;
        }
    }
    return bytes_read;
}


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