First chance exception in MSXML6 - c++

Question

I'm validating XML files against XSD schemas as they do in the MSXML documentation example. I have the following code:
XMLSchemaValidation updateInfoSchema;
updateInfoSchema.DoInitialization(L"schema.xsd");
HRESULT hr = CoInitialize(NULL);
if(SUCCEEDED(hr))
{
try
{
_bstr_t bstrOutput = updateInfoSchema.validateFile(L"valid.xml");
}
catch(_com_error &e)
{
updateInfoSchema.dump_com_error(e);
}
CoUninitialize();
}
// Macro that calls a COM method returning HRESULT value.
#define CHK_HR(stmt) do { hr=(stmt); if (FAILED(hr)) goto CleanUp; } while(0)
_bstr_t XMLSchemaValidation::validateFile(_bstr_t bstrFile)
{
// Declare and initialize variables
MSXML2::IXMLDOMSchemaCollectionPtr pXS;
MSXML2::IXMLDOMDocument2Ptr pXD;
MSXML2::IXMLDOMParseErrorPtr pErr;
_bstr_t bstrResult = L"";
HRESULT hr = S_OK;
// Create a schema cache and add xsd schema to it.
CHK_HR(pXS.CreateInstance(__uuidof(MSXML2::XMLSchemaCache60), NULL, CLSCTX_INPROC_SERVER));
CHK_HR(pXS->add(L"", (LPCSTR)(SchemaFileName.GetString())));
// Create a DOMDocument and set its properties.
CHK_HR(pXD.CreateInstance(__uuidof(MSXML2::DOMDocument60), NULL, CLSCTX_INPROC_SERVER));
// Assign the schema cache to the DOMDocument's schemas collection.
pXD->schemas = pXS.GetInterfacePtr();
// Load bstrFile into the DOM document.
pXD->async = VARIANT_FALSE;
pXD->validateOnParse = VARIANT_TRUE;
pXD->resolveExternals = VARIANT_TRUE;
if(pXD->load(bstrFile) != VARIANT_TRUE)
{
pErr = pXD->parseError;
bstrResult = _bstr_t(L"Validation failed on ") + bstrFile +
_bstr_t(L"\n=====================") +
_bstr_t(L"\nReason: ") + _bstr_t(pErr->Getreason()) +
_bstr_t(L"\nSource: ") + _bstr_t(pErr->GetsrcText()) +
_bstr_t(L"\nLine: ") + _bstr_t(pErr->Getline()) +
_bstr_t(L"\n");
}
else
{
bstrResult = _bstr_t(L"Validation succeeded for ") + bstrFile +
_bstr_t(L"\n======================\n") +
_bstr_t(pXD->xml) + _bstr_t(L"\n");
}
CleanUp:
return bstrResult;
}
XMLSchemaValidation::DoInitialization(CString XSDFileName) gets the XSD schema file name into the CString XMLSchemaValidation::SchemaFileName.
The code then follows the one in the MSXML example, but I get
First-chance exception at 0x76f9c41f (KernelBase.dll) in CSW.exe: Microsoft C++ exception: _com_error at memory location 0x04a7f014..
when code reaches CHK_HR(pXS->add(L"", (LPCSTR)(SchemaFileName.GetString())));. hr has -2146697210.
Can anyone tell me why this happens?

Answer 1

MSXML is throwing the HRESULT OBJECT_NOT_FOUND (0x800C0006) because the xml you are using does not specify a character set, as detailed in this question. Or MSXML cannot find the file.