Source: loadDOM.cpp

This C/C++ source code performs the following steps:

1. Creates an XML DOM object (pXMLDom) and sets it to synchronous mode.
2. Calls the load method on pXMLDom, specifying the path to stocks.xml.

C/C++ Source File (loadDom.cpp)

#include <stdio.h>
#include <windows.h>
#import <msxml5.dll> raw_interfaces_only
using namespace MSXML2;

// Macro that calls a COM method returning HRESULT value:
#define HRCALL(a, errmsg) \
do { \
    hr = (a); \
    if (FAILED(hr)) { \
        dprintf( "%s:%d  HRCALL Failed: %s\n  0x%.8x = %s\n", \
                __FILE__, __LINE__, errmsg, hr, #a ); \
        goto clean; \
    } \
} while (0)

// Helper function that put output in stdout and debug window
// in Visual Studio:
void dprintf( char * format, ...)
{
    static char buf[1024];
    va_list args;
    va_start( args, format );
    vsprintf( buf, format, args );
    va_end( args);
    OutputDebugStringA( buf);
    printf("%s", buf);
}

// Helper function to create a DOM instance:
IXMLDOMDocument * DomFromCOM()
{
   HRESULT hr;
   IXMLDOMDocument *pxmldoc = NULL;

    HRCALL( CoCreateInstance(__uuidof(DOMDocument50),
                      NULL,
                      CLSCTX_INPROC_SERVER,
                      __uuidof(IXMLDOMDocument),
                      (void**)&pxmldoc),
            "Create a new DOMDocument");

    HRCALL( pxmldoc->put_async(VARIANT_FALSE),
            "should never fail");
    HRCALL( pxmldoc->put_validateOnParse(VARIANT_FALSE),
            "should never fail");
    HRCALL( pxmldoc->put_resolveExternals(VARIANT_FALSE),
            "should never fail");

   return pxmldoc;
clean:
   if (pxmldoc)
    {
      pxmldoc->Release();
    }
   return NULL;
}


int main(int argc, char* argv[])
{
   IXMLDOMDocument *pXMLDom=NULL;
   IXMLDOMParseError *pXMLErr=NULL;
   BSTR bstr = NULL;
   VARIANT_BOOL status;
   VARIANT var;
   HRESULT hr;

   CoInitialize(NULL);

   pXMLDom = DomFromCOM();
   if (!pXMLDom) goto clean;

   VariantInit(&var);
   V_BSTR(&var) = SysAllocString(L"stocks.xml");
   V_VT(&var) = VT_BSTR;
   HRCALL(pXMLDom->load(var, &status), "");

   if (status!=VARIANT_TRUE) {
      HRCALL(pXMLDom->get_parseError(&pXMLErr),"");
      HRCALL(pXMLErr->get_reason(&bstr),"");
      dprintf("Failed to load DOM from stocks.xml. %S\n",
               bstr);
      goto clean;
   }
   HRCALL(pXMLDom->get_xml(&bstr), "");
   dprintf("XML DOM loaded from stocks.xml:\n%S\n",bstr);

clean:
   if (bstr) SysFreeString(bstr);
   if (&var) VariantClear(&var);
   if (pXMLErr) pXMLErr->Release();
   if (pXMLDom) pXMLDom->Release();

   CoUninitialize();
   return 0;
}

To add loadDOM.cpp to the project

1. Create a new C++ source file. For detailed instructions on how to do this, see Set Up My Visual C++ Project. Name the new file loadDOM.cpp.
2. Copy the C/C++ source code above, and paste it into the source file you just created.

Next, we'll add the resource file, stocks.xml.