DirectShow Editing Services (DES) and combining AVI files

#include <stdafx.h>

#include <fstream>

#include <wxdebug.h>

#include "ErrorLog.h"

namespace DESCombineLib {

/*
	=====================================================================
	=====================================================================
	ErrorLog
	=====================================================================
	=====================================================================
*/
/*
	=====================================================================
	=====================================================================
*/
ErrorLog::ErrorLog(TCHAR *name, LPUNKNOWN unknown, HRESULT *phr) 
: CUnknown( name, unknown, phr )
{ 
}
/*
	=====================================================================
	=====================================================================
*/
STDMETHODIMP ErrorLog::LogError(
	LONG Severity,          // Reserved. Do not use.
	BSTR ErrorString,       // Description.
	LONG ErrorCode,         // Error code.
	HRESULT hresult,        // HRESULT that caused the error.
	VARIANT *extraInfo		// Extra information about the error.
) {
	std::wostringstream os;
	os << std::endl;

	if( ErrorString )
		os << L"ErrorString = " << std::wstring( ErrorString ) << std::endl;
	os << L"ErrorCode = " << ErrorCode << std::endl;
	os << L"hresult = 0x" << std::hex << hresult;	// do not append 'std::endl';

	if( extraInfo ) {
		os << std::endl;

		if( VT_BSTR == extraInfo->vt ) 
			os << L"extra information = " << extraInfo->bstrVal;
		else 
			os << L"extraInfo #" << extraInfo->vt;
	}

	DbgLog( (LOG_ERROR, 5, os.str().c_str()) );
	::OutputDebugString( _T("\n") );
	::OutputDebugString( os.str().c_str() );
	::OutputDebugString( _T("\n\n") );
	ASSERT( !"better check this error" );
	return S_OK;
}
/*
	=====================================================================
	=====================================================================
*/
STDMETHODIMP ErrorLog::NonDelegatingQueryInterface( REFIID riid, void **ppv )
{
	if( IID_IAMErrorLog == riid )
        return GetInterface((IAMErrorLog*)this, ppv);

    return CUnknown::NonDelegatingQueryInterface(riid, ppv);
}

} //namespace DESCombineLib {