To the code…
Here is a simple quick and dirty code I wrote mainly following the code samples on MSDN. This program takes a filename as a parameter, opens it, and parses the XML printing out the elements. The code I actually wrote looks cleaner, but this will get you going.
MSDN Refrences
MSXML6
XmlLite
/*
* xml_lite.cpp
*
* Description : simple code to show using XML Lite
*/
#include <objbase.h>
#include <XmlLite.h>
#include <shlwapi.h>
#include <stdio.h>
HRESULT WriteAttributes(IXmlReader* pReader)
{
const WCHAR* pwszPrefix;
const WCHAR* pwszLocalName;
const WCHAR* pwszValue;
HRESULT hr = pReader->MoveToFirstAttribute();
if (S_FALSE == hr)
return hr;
if (S_OK != hr)
{
wprintf(L"Error moving to first attribute, error is %08.8lx", hr);
return -1;
}
else
{
while (TRUE)
{
if (!pReader->IsDefault())
{
UINT cwchPrefix;
if (FAILED(hr = pReader->GetPrefix(&pwszPrefix, &cwchPrefix)))
{
wprintf(L"Error getting prefix, error is %08.8lx", hr);
return -1;
}
if (FAILED(hr = pReader->GetLocalName(&pwszLocalName, NULL)))
{
wprintf(L"Error getting local name, error is %08.8lx", hr);
return -1;
}
if (FAILED(hr = pReader->GetValue(&pwszValue, NULL)))
{
wprintf(L"Error getting value, error is %08.8lx", hr);
return -1;
}
if (cwchPrefix > 0)
wprintf(L"Attr: %s:%s=\"%s\" \n", pwszPrefix, pwszLocalName, pwszValue);
else
wprintf(L"Attr: %s=\"%s\" \n", pwszLocalName, pwszValue);
}
if (S_OK != pReader->MoveToNextAttribute())
break;
}
}
return hr;
}
int __cdecl wmain(
__in int argc,
__in_ecount(argc) LPCTSTR argv[])
{
HRESULT hr = S_OK;
IStream *pStream = NULL;
IXmlReader *pReader = NULL;
UINT cAttribute = 0;
if (FAILED(hr = SHCreateStreamOnFile(argv[1], STGM_READ, &pStream)))
{
wprintf(L"Error creating file reader, error is %08.8lx", hr);
return hr;
}
if (FAILED(hr = CreateXmlReader(__uuidof(IXmlReader), (void**) &pReader, NULL)))
{
wprintf(L"error creating xml reader, error is %08.8lx", hr);
return hr;
}
if (FAILED(hr = pReader->SetProperty(XmlReaderProperty_DtdProcessing, DtdProcessing_Prohibit)))
{
wprintf(L"Error setting XmlReaderProperty_DtdProcessing, error is %08.8lx", hr);
return -1;
}
if (FAILED(hr = pReader->SetInput(pStream)))
{
wprintf(L"Error setting input for reader, error is %08.8lx", hr);
return -1;
}
XmlNodeType nodeType;
while (S_OK == (hr = pReader->Read(&nodeType)))
{
LPCWSTR pwszPrefix = NULL;
UINT cwchPrefix = 0;
LPCWSTR pwszLocalName = NULL;
LPCWSTR pwszValue = NULL;
switch (nodeType)
{
case XmlNodeType_XmlDeclaration:
wprintf(L"XmlDeclaration\n");
if (FAILED(hr = WriteAttributes(pReader)))
{
wprintf(L"Error writing attributes, error is %08.8lx", hr);
return -1;
}
break;
case XmlNodeType_Element:
if (FAILED(hr = pReader->GetPrefix(&pwszPrefix, &cwchPrefix)))
{
wprintf(L"Error getting prefix, error is %08.8lx", hr);
return -1;
}
if (FAILED(hr = pReader->GetLocalName(&pwszLocalName, NULL)))
{
wprintf(L"Error getting local name, error is %08.8lx", hr);
return -1;
}
if (cwchPrefix > 0)
wprintf(L"Element: %s:%s\n", pwszPrefix, pwszLocalName);
else
wprintf(L"Element: %s\n", pwszLocalName);
if (FAILED(hr = WriteAttributes(pReader)))
{
wprintf(L"Error writing attributes, error is %08.8lx", hr);
return -1;
}
if (pReader->IsEmptyElement() )
wprintf(L" (empty)");
break;
case XmlNodeType_EndElement:
if (FAILED(hr = pReader->GetPrefix(&pwszPrefix, &cwchPrefix)))
{
wprintf(L"Error getting prefix, error is %08.8lx", hr);
return -1;
}
if (FAILED(hr = pReader->GetLocalName(&pwszLocalName, NULL)))
{
wprintf(L"Error getting local name, error is %08.8lx", hr);
return -1;
}
if (cwchPrefix > 0)
wprintf(L"End Element: %s:%s\n", pwszPrefix, pwszLocalName);
else
wprintf(L"End Element: %s\n", pwszLocalName);
break;
/*
case XmlNodeType_Text:
case XmlNodeType_Whitespace:
if (FAILED(hr = pReader->GetValue(&pwszValue, NULL)))
{
wprintf(L"Error getting value, error is %08.8lx", hr);
return -1;
}
wprintf(L"Text: >%s<\n", pwszValue);
break;
*/
case XmlNodeType_CDATA:
if (FAILED(hr = pReader->GetValue(&pwszValue, NULL)))
{
wprintf(L"Error getting value, error is %08.8lx", hr);
return -1;
}
wprintf(L"CDATA: %s\n", pwszValue);
break;
case XmlNodeType_ProcessingInstruction:
if (FAILED(hr = pReader->GetLocalName(&pwszLocalName, NULL)))
{
wprintf(L"Error getting name, error is %08.8lx", hr);
return -1;
}
if (FAILED(hr = pReader->GetValue(&pwszValue, NULL)))
{
wprintf(L"Error getting value, error is %08.8lx", hr);
return -1;
}
wprintf(L"Processing Instruction name:%S value:%S\n", pwszLocalName, pwszValue);
break;
case XmlNodeType_Comment:
if (FAILED(hr = pReader->GetValue(&pwszValue, NULL)))
{
wprintf(L"Error getting value, error is %08.8lx", hr);
return -1;
}
wprintf(L"Comment: %s\n", pwszValue);
break;
case XmlNodeType_DocumentType:
wprintf(L"DOCTYPE is not printed\n");
break;
}
/*
hr = pReader->GetAttributeCount(&cAttribute);
if (S_OK == hr)
{
wprintf(L"num attrubutes %i\n", cAttribute);
}
*/
}
return hr;
}
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