XML validation using XSD and XMLDOM

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Hi,

I'm trying to validate xml data using an xsd defined in memory (not a file).

I tried the following code :

C++

MSXML2::IXMLDOMParseErrorPtr pError;
MSXML2::IXMLDOMSchemaCollection2Ptr pSchemas;
HRESULT hr = pSchemas.CreateInstance(__uuidof(XMLSchemaCache60));

if(pSchemas)
{
  // Get Schema in memory (xsd is a buffer with the content of an xsd file)
  MSXML2::IXMLDOMDocumentPtr pSchema;
  hr = pSchema.CreateInstance(__uuidof(DOMDocument60));
  if(SUCCEEDED(hr))
  {
    pSchema->async = VARIANT_FALSE;
    hr = pSchema->loadXML(_bstr_t((const char*)xsd));
    if(hr==VARIANT_TRUE)
    {
      hr = pSchemas->add("",pSchema.GetInterfacePtr());
    }
    else
    {
	DisplayParseError(pSchema->parseError);
    }
  }
}
// Load the xml document and validate it
MSXML2::IXMLDOMDocument2Ptr xml;
HRESULT hRes = xml.CreateInstance(__uuidof(DOMDocument60));
if(SUCCEEDED(hRes))
{
  xml->validateOnParse = VARIANT_FALSE;
  xml->async = VARIANT_FALSE;

  if(pSchemas)
    xml->schemas = pSchemas.GetInterfacePtr();

  VARIANT_BOOL bRes = xml->loadXML(_bstr_t(xmlbuffer));
  if(VARIANT_TRUE==bRes)
  {
    pError = xml->validate();
    if(pError->errorCode == S_OK)
    {
      // XML is OK
    }
    else
    {
      DisplayValidateError(pError);
    }
  }
  else
  {
    DisplayParseError(xml->parseError);
  }
}

But I always got an E_FAIL error on

C++

pSchemas->add("",pSchema.GetInterfacePtr());

According to the documentation of IXMLDOMSchemaCollection, the second parameter of add is variant and can be a string to specify a file or a DOMDocument.

Can anyone tell me where I'm wrong ? What is missing ?

This code is adapted from a MSDN Example. But in this example, it's a XDR file loaded, not XSD...

I'm using MSXML6.

Posted 27-Nov-13 6:25am

Pascal-78

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Pascal-78 · Accepted Answer · 2013-11-27T22:39:00

Using the following code, I got extra information on the error

C++

try
{
	hr = pSchemas->add("",pSchema.GetInterfacePtr());
}
catch(_com_error &error)
{
	dump_com_error(error);
}

And the error was: (translated from french)

The namespace "" provided si different from the target namespace "http://tempuri.org/Device.xsd" of the schema.

When I generate the XSD file with Visual Studio 2010, it starts the file with:

XML

<xs:schema id="Device"
    targetNamespace="http://tempuri.org/Device.xsd"
    elementFormDefault="qualified"
    xmlns="http://tempuri.org/Device.xsd"
    xmlns:mstns="http://tempuri.org/Device.xsd"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
>

The solution is to use the targetNamespace value as the first parameter of add method.