problem parsing a xml file with MSXML4 in C++

Question

Here is my parsing code:

MSXML2::IXMLDOMNodePtr pNode = m_pXmlDoc->selectSingleNode(kNameOfChild.c_str());

MSXML2::IXMLDOMNodeListPtr pIDOMNodeList = NULL;
MSXML2::IXMLDOMNodePtr pIDOMNode = NULL;
long numOfChildNodes= 0;
BSTR bstrItemText;
HRESULT hr;

MSXML2::IXMLDOMElementPtr pChildNode = m_pXmlDoc->getElementsByTagName(kNameOfChild.c_str());


hr  = m_pXmlDoc->get_childNodes(&pIDOMNodeList);

hr = pIDOMNodeList->get_length(&numOfChildNodes);

And my xml file:

<?xml version="1.0"?>
<GovTalkMessage>
<EnvelopeVersion>1.0</EnvelopeVersion>
<Header>
  <MessageDetails>
     <Class>MOSWTSC2</Class>
     <Qualifier>acknowledgement</Qualifier>
     <Function>submit</Function>
     <TransactionID>20021202ABC</TransactionID>
     <CorrelationID>B07B9ED3176193DDC4EC39063848A927</CorrelationID>
     <ResponseEndPoint PollInterval="10">
      https://secure.gateway.gov.uk/poll
     </ResponseEndPoint>
     <GatewayTimestamp>2001-01-31T10:20:18.345</GatewayTimestamp>
  </MessageDetails>
  <SenderDetails/>
 </Header>
<GovTalkDetails>
   <Keys/>
</GovTalkDetails>
<Body/>
</GovTalkMessage>

kNameOfchild is "Qualifier"
pNode is always NULL
pChildNode is always NULL
hr returns S_OK
numOfChildNodes is always 0

So, what am I doing wrong? Thanks

Luke · Accepted Answer · 2009-12-06 16:47:18Z

1

Try /GovTalkMessage/Header/MessageDetails/Qualifier for the XPath query.

answered Dec 6, 2009 at 16:47

Luke

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Comments

Naveen · Accepted Answer · 2009-12-03 05:40:22Z

0

You need to provide the xpath for the selectSingleNode call. There may be multiple "Qualifier" present in XML file, so in case you just pass "Qualifier" parser doesn't know which one to return. I haven't used XPath too many times, but I think this string should work for querying: "Header/MessageDetails[0]/Qualifier"

answered Dec 3, 2009 at 5:40

Naveen

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