//add Id array to a document fragment node
HRESULT AddIdsNode(
IXMLDOMDocument* pDOM,
BSTR indentBstr,
const wchar_t* wszIdsNodeName,
const wchar_t* wszIdsNodeAttribute,
const wchar_t* wszIdNode,
const std::vector<int>& ids,
IXMLDOMDocumentFragment* pdf // Release is completed outside
)
{
VARIANT var;
BSTR bstr = NULL;
BSTR bstr_wst = SysAllocString(L"\t");
IXMLDOMElement* pe = NULL;
IXMLDOMDocumentFragment* pdfSub = NULL;
IXMLDOMAttribute *pa = NULL;
IXMLDOMAttribute *pa1 = NULL;
HRESULT hr = S_OK;
do
{
//create a Node to hold ids.
bstr = SysAllocString(wszIdsNodeName);
HR_SUCCESSCALL( pDOM->createElement(bstr, &pe), hr );
SAFE_BSTR_RELEASE(bstr);
//create a attribute for the <wszIdsNodeName> element, and
//assign the element num as the attribute value.
//get ids num string
size_t idsNum = ids.size();
const int radix = 10;
const size_t sizeOfstr = 30;
wchar_t wszIdsNumString[sizeOfstr] = {0};
_ultow_s(static_cast<unsigned long>(idsNum), wszIdsNumString, sizeOfstr, radix);
//put num string into attribute
bstr = SysAllocString(wszIdsNodeAttribute);
VariantInit(&var);
V_BSTR(&var) = SysAllocString(wszIdsNumString);
V_VT(&var) = VT_BSTR;
HR_SUCCESSCALL( pDOM->createAttribute(bstr, &pa), hr );
HR_SUCCESSCALL( pa->put_value(var), hr );
HR_SUCCESSCALL( pe->setAttributeNode(pa, &pa1), hr );
//create a document fragment to hold ids sub-elements.
HR_SUCCESSCALL( pDOM->createDocumentFragment(&pdfSub), hr );
//add ids to pdfSub
for( size_t i=0; i < idsNum; ++i )
{
int id = ids[i];
WCHAR wszIdString[sizeOfstr] = {0};
_itow_s(id, wszIdString, sizeOfstr, radix);
//add white space before <id>
HR_SUCCESSCALL( AddWhiteSpaceToNode(pDOM, indentBstr, pdfSub), hr );
HR_SUCCESSCALL( AddWhiteSpaceToNode(pDOM, bstr_wst, pdfSub), hr );
HR_SUCCESSCALL( AddSubNodeToDocumentFragment(pDOM, wszIdNode, wszIdString, pdfSub), hr );
}
//test whether it is successful in "add ids to pdfSub"
HR_SUCCESSCALL( hr, hr );
//add ids array to document fragment node
HR_SUCCESSCALL( AppendChildToParent(pdfSub, pe), hr );
HR_SUCCESSCALL( AddWhiteSpaceToNode(pDOM, indentBstr, pe), hr );
HR_SUCCESSCALL( AppendChildToParent(pe, pdf), hr );
}while(0);
//release the com objects
SAFE_COM_RELEASE(pa1);
SAFE_COM_RELEASE(pa);
SAFE_COM_RELEASE(pdfSub);
SAFE_COM_RELEASE(pe);
//release the bstr and variant
SAFE_BSTR_RELEASE(bstr);
SAFE_BSTR_RELEASE(bstr_wst);
VariantClear(&var);
return hr;
}
