Xerces C++ Problem

**mearvk** · Jun 27 '08, 07:07 PM

Re: Xerces C++ Problem

On May 9, 7:26 pm, mearvk <mea...@gmail.c omwrote:

Code:

>
int DDAS_XML_Handler::writeResultDocument( int job_id, int
num_results, DDAS_CLIENT_RESULT_DATA* results )
        {
                try
                {
>
                DOMElement* data_row;
                DOMElement* coeff;
                DOMElement* root;
>
                DOMAttr* sse_attr;
                DOMAttr* bin_rep_attr;
                DOMAttr* def_num_attr;
                DOMAttr* index_attr;
                DOMAttr* value_attr;
                DOMAttr* job_id_attr;
>
                XMLCh* data_row_ch      =
XMLString::transcode("data_row");
                XMLCh* sse_ch           = XMLString::transcode("SSE");
                XMLCh* bin_rep_ch       =
XMLString::transcode("binary_representation");
                XMLCh* def_num_ch       =
XMLString::transcode("definition_number");
                XMLCh* coeff_ch         =
XMLString::transcode("coefficient");
                XMLCh* index_ch         =
XMLString::transcode("index");
                XMLCh* value_ch         =
XMLString::transcode("value");
                XMLCh* job_id_ch        =
XMLString::transcode("jobID");
>
                //printDCRD(results);
>
                //create a DOM
                DOMImplementation* impl =
DOMImplementationRegistry::getDOMImplementation(XMLString::transcode("Range"));
                DOMDocument* doc        = impl->createDocument(0,
XMLString::transcode("job_results"), 0);
>
                //document root
                root = doc->getDocumentElement();
>
                //root's job ID attribute
                job_id_attr     = doc->createAttribute(job_id_ch);
>
                //add the job_id attribute to root tag
                char* job_buffer = new char[128];
                sprintf( job_buffer, "%i", job_id );
                XMLString::trim(job_buffer);
                job_id_attr->setValue(XMLString::transcode(job_buffer));
>
                root->setAttributeNode(job_id_attr);
                delete[] job_buffer;
>
                //for each data row
                for( int i=0; i<num_results; i++ )
                {
                        data_row        = doc->createElement(data_row_ch);
>
                        sse_attr        = doc->createAttribute(sse_ch);
>
                        bin_rep_attr    = doc->createAttribute(bin_rep_ch);
>
                        def_num_attr    = doc-
>[QUOTE]
createAttribute(def_num_ch);
	
		
			
			
			
				I am unable to get Xerces to write out attributes from a struct which
I am able to print out and verify is correct. The structs are defined
below as is subsection of the output.
>
			
		
	
>
                        //set SSE value
                        char* sse_buffer = new char[128];
                        sprintf( sse_buffer, "%f",results->SSEs[i] );
>
                        //set binary representation value
                        char* br_buffer = new char[128];
                        sprintf( br_buffer, "%s", results-
>[QUOTE]
bin_reps[i] );[/QUOTE]
>
                        //set defintion number value
                        char* dn_buffer = new char[128];
                        sprintf( dn_buffer, "%s", results-
>[QUOTE]
def_nums[i] );[/QUOTE]
>
                        //trim strings
                        XMLString::trim(sse_buffer);
                        XMLString::trim(br_buffer);
                        XMLString::trim(dn_buffer);
>
                        //convert to XMLCh*
                        XMLCh* sse_val     =
XMLString::transcode(sse_buffer);
                        XMLCh* bin_rep_val =
XMLString::transcode(br_buffer);
                        XMLCh* def_num_val =
XMLString::transcode(dn_buffer);
>
                        //set attr values
                        sse_attr    ->setValue(sse_val);
                        bin_rep_attr->setValue(bin_rep_val);
                        def_num_attr->setValue(def_num_val);
>
                        //append attribute nodes to data row
                        data_row->setAttributeNode(sse_attr);
                        data_row->setAttributeNode(bin_rep_attr);
                        data_row->setAttributeNode(def_num_attr);
>
                        //append data row to root
                        root->appendChild(data_row);
>
                        //free memory
                        delete[] sse_buffer;
                        delete[] br_buffer;
                        delete[] dn_buffer;
                        XMLString::release(&sse_val);
                        XMLString::release(&bin_rep_val);
                        XMLString::release(&def_num_val);
>
                        //handle coefficients on aper data row basis
                        for( unsigned int j=0; j<results->coefficients->size; j++)
>
                        {
                                //create coefficient element
                                coeff = doc->createElement(coeff_ch);
>
                                //create attribute nodes
                                index_attr= doc->createAttribute(index_ch);
>
                                value_attr= doc-
>[QUOTE]
createAttribute(value_ch);[/QUOTE]
>
                                //request some space for conversion
                                char* index_buffer = new char[128];
                                char* value_buffer = new char[128];
>
                                //convert from numeric to char*
                                sprintf( index_buffer, "%i", results->coefficients[i].index[j] );
>
                                sprintf( value_buffer, "%f", results-
>[QUOTE]
coefficients[i].values[j] );[/QUOTE]
>
                                //remove whitespace
                                XMLString::trim(index_buffer);
                                XMLString::trim(value_buffer);
>
                                //create values as XMLCh*
                                XMLCh* index_val =
XMLString::transcode(index_buffer);
                                XMLCh* value_val =
XMLString::transcode(value_buffer);
>
                                //set values
                                index_attr->setValue(index_val);
                                value_attr->setValue(value_val);
>
                                coeff->setAttributeNode(index_attr);
                                coeff->setAttributeNode(value_attr);
>
                                //append coefficient to data row
                                data_row->appendChild(coeff);
>
                                //free memory
                                delete[] index_buffer;
                                delete[] value_buffer;
>
                        }//end inner for loop
>
                }//end outer for loop
>
                //DOM serializer
                DOMWriter* writer = ((DOMImplementationLS*)impl)-
>[QUOTE]
createDOMWriter();[/QUOTE]
>
                //request some space for URL
                char* buffer = new char[512];
>
                //create URL based on job ID
                sprintf( buffer, "%sjob_%u_results.xml",
DDAS_RESULT_URL, job_id );
>
                //remove whitespace
                XMLString::trim(buffer);
>
                //create URL as XMLCh*
                XMLCh* url_ch = XMLString::transcode(buffer);
>
                //set output type
                LocalFileFormatTarget local_file( url_ch );
>
                //set some formatting options
                if (writer->canSetFeature(XMLUni::fgDOMWRTDiscardDefaultContent, true))
>
                        writer->setFeature(XMLUni::fgDOMWRTDiscardDefaultContent, true);
>
                if (writer->canSetFeature(XMLUni::fgDOMWRTFormatPrettyPrint, true))
>
                        writer-
>[QUOTE]
setFeature(XMLUni::fgDOMWRTFormatPrettyPrint, true);[/QUOTE]
>
                //actually write the root node to file
                writer->writeNode(&local_file, *root);
>
                //free resources
                writer  ->release();
                doc     ->release();
                delete[] buffer;
>
                return 1;
>
                }
                catch( XMLException& e)
                {
                        char* message =
XMLString::transcode( e.getMessage() );
                        cerr << "The following error occurred during
the DOM creation: " << message << endl;
                        XMLString::release( &message );
                }
        }
>

>
Here are the structs used:
>

Code:

>
struct REGRESSION_COEFFICIENTS
{
        //which column are talking about
        int*            index;
>
        //the value of the linear coefficient
        double*         values;
>
        //the size of the struct
        unsigned int    size;
>
};
>
///A struct used to hold the client result data
struct DDAS_CLIENT_RESULT_DATA
{
        /// The binary representation of the definition number -
serves to disambiguate endianess
        char**          bin_reps;
>
        /// The decimal representation of the combination of
independent variables used in this regression (1011 base 2 == 11 base
10)
        char**          def_nums;
>
        /// The sum of squared error for the linear regression
        double*         SSEs;
>
        /// How many results are contained in the struct
        unsigned int   size;
>
        //regression coefficients
        REGRESSION_COEFFICIENTS* coefficients;
>
};
>

>
And here is a sample of the output:
>
[OUTPUT]
>
<data_row SSE="137.527403 " binary_represen tation="1010111 011111001"
definition_numb er="44793">
<coefficient index="0" value="-0.000977"/>
<coefficient index="1" value="0.000000 "/>
<coefficient index="2" value="0.000000 "/>
<coefficient index="3" value="-66123751426.362 999"/>
<coefficient index="4" value="0.000088 "/>
<coefficient index="5" value="10958014 73.097510"/>
<coefficient index="6" value="0.003840 "/>
<coefficient index="7" value="-26494374893.985 001"/>
<coefficient index="8" value="0.000000 "/>
<coefficient index="9" value="0.097907 "/>
<coefficient index="10" value="0.004219 "/>
<coefficient index="11" value="66123751 426.363098"/>
<coefficient index="12" value="0.000000 "/>
<coefficient index="13" value="-1095801473.1025 00"/>
<coefficient index="14" value="0.000000 "/>
<coefficient index="15" value="26494374 894.009701"/>
</data_row>
>
<data_row SSE="137.533380 " binary_represen tation=""
definition_numb er="">
<coefficient index="0" value="-0.001039"/>
<coefficient index="1" value="0.097757 "/>
<coefficient index="2" value="75825857 3.171398"/>
<coefficient index="3" value="-35123845436.044 098"/>
<coefficient index="4" value="0.000000 "/>
<coefficient index="5" value="0.000000 "/>
<coefficient index="6" value="-464164413.89040 3"/>
<coefficient index="7" value="0.024555 "/>
<coefficient index="8" value="0.000000 "/>
<coefficient index="9" value="0.000000 "/>
<coefficient index="10" value="-758258573.16723 3"/>
<coefficient index="11" value="35123845 436.044197"/>
<coefficient index="12" value="0.000016 "/>
<coefficient index="13" value="-0.004898"/>
<coefficient index="14" value="46416441 3.894253"/>
<coefficient index="15" value="0.000000 "/>
</data_row>
>
<data_row SSE="137.533796 " binary_represen tation="0111111 011P>V"
definition_numb er="32457">
<coefficient index="0" value="-0.001034"/>
<coefficient index="1" value="0.000000 "/>
<coefficient index="2" value="0.000000 "/>
<coefficient index="3" value="-35209041045.623 802"/>
<coefficient index="4" value="0.000000 "/>
<coefficient index="5" value="0.000000 "/>
<coefficient index="6" value="-425970878.52097 1"/>
<coefficient index="7" value="0.024583 "/>
<coefficient index="8" value="0.000000 "/>
<coefficient index="9" value="0.097997 "/>
<coefficient index="10" value="0.004175 "/>
<coefficient index="11" value="35209041 045.623802"/>
<coefficient index="12" value="-0.000016"/>
<coefficient index="13" value="-0.004899"/>
<coefficient index="14" value="42597087 8.524831"/>
<coefficient index="15" value="0.000000 "/>
</data_row>
>
[/OUTPUT]
>
Some of the output is correct, some is there but erroneous, some is
missing altogether. Each data_row element should have a
definition_numb er with some value between 0 and (2^16)-1. The binary
representation is merely the binary representation of the decimal
value. I have spent many hours trying to figure out what the error
is. Again, I am able to print the struct (printDCRD) at the beginning
of the method and verify that the data contained therein is correct
and present.
>
So, if anyone can lend me some attention cycles, I'd greatly
appreciate it.
>
Thanks ahead.[/QUOTE]

Anyone?

**Joseph J. Kesselman** · Jun 27 '08, 07:07 PM

Re: Xerces C++ Problem

Anyone?

Have you tried asking on the mailing list specifically for Xerces C++?

(I haven't used the C++ version in about five years. I might be able to
dig through this, but given the time it'd take for me to to so you could
probably get a faster answer by asking the folks actually using and
developing that parser.)

**mearvk** · Jun 27 '08, 07:07 PM

Re: Xerces C++ Problem

On May 11, 8:54 pm, "Joseph J. Kesselman" <keshlam-nos...@comcast. net>
wrote:

Anyone?

>
Have you tried asking on the mailing list specifically for Xerces C++?
>
(I haven't used the C++ version in about five years. I might be able to
dig through this, but given the time it'd take for me to to so you could
probably get a faster answer by asking the folks actually using and
developing that parser.)

I'll try it.

Xerces C++ Problem

Xerces C++ Problem

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