CODEWITHSUNDEEP
c++error-handlingxsltixmldomdocument
Justin
Justin

Reputation: 86729

Getting runtime error information from IXMLDOMDocument::transformNode function

I'm using IXMLDOMDocument::transformNode to apply an XSLT transform using C++ code that looks a little bit like this:

CComPtr<IXMLDOMDocument2> spXMLDoc;
// load spXMLDoc

CComPtr<IXMLDOMDocument2> spXSLDoc;
// load spXSLDoc

BSTR *pResult;
HRESULT hr = spXMLDoc->transformNode( spXSLDoc, pResult );
if (FAILED(hr))
{
    // Handle me
}

This code works, however if the transform fails then I don't know how to get any information about where or why it failed - at the moment its failing (on a complex XSLT with multiple includes) with a HRESULT of E_FAIL - is there any way I can get some more detail on why its failing?

I've already tried the parseError property to get more error detail:

IXMLDOMParseError *parseError = NULL;
hr = spXMLDoc->get_parseError(&parseError);
if ( !FAILED( hr ) )
{
    long errorCode = 0;
    hr = parseError->get_errorCode(&errorCode);
    // etc...

The call to get_parseError succeeds, however the call to get_errorCode fails with HRESULT S_FALSE, indicating that there was not a parse error. This page tells me that there are two types of error - parse errors and runtime errors. It shows how to handle both, however appears to be JavaScript oriented - in my case no C++ runtime errors are thrown.

Upvotes: 3

Views: 1572

Answers (1)

William Walseth
William Walseth

Reputation: 2923

Sorry, I'm not sure from C++. You might try a quick command line transformation to help find the error in XSLT. There's a number of errors where the XSL will load, but can't transform. For an example pop an somewhere in the XSL file to trigger this type of error.

Here's a sample command line transformation tool. Write to transform.js and run cscript.exe transform.js from a command line 

var strDOMObject = "MSXML2.FreeThreadedDOMDocument";
var strHTTPObject = "MSXML2.XMLHTTP";
var strTemplateObject = "MSXML2.XSLTemplate";

function transform( xml, xsl ) {
    var xslt = new ActiveXObject( strTemplateObject );
    var xmlReturn = new ActiveXObject( strDOMObject );
    var xslProc;
    try {
        xslt.stylesheet = xsl;
    } catch( e ) {
        throw e;
    }

    xslProc = xslt.createProcessor();
    xslProc.input = xml;
    xslProc.transform();
    return xslProc.output;
}


try {
    var xml = new ActiveXObject( strDOMObject );
    xml.load( "id.xml" );
    var xsl = new ActiveXObject( strDOMObject );
    xsl.load( "id.xsl" );
    WScript.Echo( transform( xml, xsl ) );

} catch( err ) {
    WScript.Echo (err.description );
}

Hope this helps, and that you can find out the C++ answer.

Upvotes: -1

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