Parse an xml

[pdk5]

Hi,

I want to parse and get the list of following parameter.

Can i just use c++ or do i need to use free tools like DOM, tinyXML etc. Please kindly suggest.

thanks
pdk

[2kaud]

You can parse it direct using standard c++ - as XML is just text. However, it would probably be easier to use something like tinyXML-2 or other simple XML parser.

[Arjay]

Why waste time hand parsing xml and debugging the code when there readily available parsing libraries?

[2kaud]

Why waste time hand parsing xml and debugging the code when there readily available parsing libraries?

Only as an exercise!

[Arjay]

Only as an exercise!

IMO, a better exercise would be to learn how to leverage what's available. In programming, there is so much to learn there is little time to reinvent the wheel.

[VictorN]

IMO, a better exercise would be to learn how to leverage what's available. In programming, there is so much to learn there is little time to reinvent the wheel.

[pdk5]

Thanks a lot Kaud, Arjay and Victor for comments
I am told to use the COM utility to do this task
So i was googling and trying to learn and wrote the following code. But it fails at transform.

I am using the visual studio 15. Any help is very much appreciated and it is very urgent (I already wasted yesterday trying debug myself but no progress)

It is failing at transformNodeToObject step

#include "stdafx.h"
#include <windows.h>
#include "iostream"

#include <WTypes.h>
#include <comdef.h>

#include <wchar.h>

#include <vector>

#import <msxml6.dll>

using namespace MSXML2;
using namespace std;
int main()
{

	HRESULT hResult = S_OK;
	hResult = CoInitialize(NULL);

	if (FAILED(hResult))
	{
		cerr << "Failed to initialize COM environment" << endl;
		return 0;
	}

	// MSXML COM smart pointers
    // Use the Document2 class to enable schema validation
    IXMLDOMDocument2Ptr spDocSource;
	IXMLDOMDocument2Ptr spDocResult;
	IXMLDOMDocument2Ptr spDocStylesheet;
	struct IDispatch * pDispatch;

	// Create the COM DOM Document objects
	hResult = spDocSource.CreateInstance(__uuidof(DOMDocument60));
	if FAILED(hResult)
	{
		cerr << "Failed to create Source Document instance" << endl;
		return 1;
	}

	hResult = spDocResult.CreateInstance(__uuidof(DOMDocument60));
	if FAILED(hResult)
	{
		cerr << "Failed to create Result Document instance" << endl;
		return 1;
	}

	hResult = spDocStylesheet.CreateInstance(__uuidof(DOMDocument60));
	if FAILED(hResult)
    {
		cerr << "Failed to create Stylesheet Document instance" << endl;
		return 1;
	}

	// Load the source document
    spDocSource->async = VARIANT_FALSE;
	hResult = spDocSource->load("xmlinputfile.xml");
	if (hResult != VARIANT_TRUE)
	{
		cout << "Error parsing xmlinputfile.xml" << endl;
		return 1;
	}

	spDocSource->async = VARIANT_FALSE;
	hResult = spDocSource->load("XSLTFile1.xslt");
	if (hResult != VARIANT_TRUE)
	{
		cout << "Error parsing XSLTFile1.xml" << endl;
		return 1;
	}

	spDocResult->QueryInterface(IID_IDispatch, (void **)&pDispatch);
	VARIANT vResultDoc;
	vResultDoc.vt = VT_DISPATCH;
	vResultDoc.pdispVal = pDispatch;

	hResult = spDocSource->transformNodeToObject(spDocStylesheet, vResultDoc);


	if FAILED(hResult)
	{
		cout << "Error in performing transformation" << endl;
		return 1;
	}

[Arjay]

You don't need to transform anything if you are only trying to read xml. Have your requirements changed from your original post? If not, google for some COM code that shows you how to read the elements.

[pdk5]

This issue is resolved now. My updated code is as below. Thanks a lot for the discussions..

	HRESULT hr = CoInitialize(NULL);

	MSXML2::IXMLDOMDocumentPtr pXMLDom;
	MSXML2::IXMLDOMDocumentPtr pXSLDoc;
	MSXML2::IXMLDOMDocumentPtr pXMLOut;

	// Load the XML file. 
	pXMLDom.CreateInstance(__uuidof(MSXML2::DOMDocument60), NULL, CLSCTX_INPROC_SERVER);


	pXMLDom->async = VARIANT_FALSE; // The default is true. 
	pXMLDom->validateOnParse = VARIANT_FALSE;
	pXMLDom->resolveExternals = VARIANT_FALSE;

	pXMLDom->load(L"xmlinputfile.xml");


	// Load the XSLT style sheet. 
	FAILED(pXSLDoc.CreateInstance(__uuidof(MSXML2::DOMDocument60), NULL, CLSCTX_INPROC_SERVER));

	pXSLDoc->async = VARIANT_FALSE; // The default is true. 
	pXSLDoc->validateOnParse = VARIANT_FALSE;
	pXSLDoc->resolveExternals = VARIANT_FALSE;

	pXSLDoc->load(L"XSLTFile1.xslt");

	// Transform the XSLT to an XML string. 
	_bstr_t xmlStr = pXMLDom->transformNode(pXSLDoc);