c++ - appendChild xml c++ 无法按需工作

Question

为什么在执行appendChild后，我无法读取下一个节点？

(newChildList->get_item(count,&pNewChild))

appendChild API 没有正常工作。放置此行后，我无法在循环中获取下一个 get_item()。它返回 pNewChild，它是 NULL。为什么会这样？

IXMLDOMNode *pNewChild=NULL,*outNewChild;
IXMLDOMNodeList *newChildList=NULL;
BSTR newName;
long len=0;
HRESULT hr=S_OK;

//aggregate attribute
//CHK_HR(aggregateAttribute(pNodeNew,pXMLDomSrc,pXMLDomNew));

//read the list of child
CHK_HR(pNodeNew->get_childNodes(&newChildList));
CHK_HR(newChildList->get_length(&len));
//go over all the children
for(long count=0;count<len;count++)
{       
    hr =newChildList->get_item(count,&pNewChild);
    CHK_HR(pNewChild->get_nodeName(&newName));

    USES_CONVERSION;
    string temp= W2T(newName);
    temp = temp.substr(temp.find_first_of("/:")+1);
    if (!temp.compare("tuple")) 
    {       
        //CHK_HR(aggregateTuple(pXMLDomSrc,pNewChild));
    }       
    else 
    {       
        CHK_HR(pXMLElement->appendChild(pNewChild,&outNewChild));
    }
    SAFE_RELEASE(pNewChild);
    //SysFreeString(newName);
}

CleanUp:
//SAFE_RELEASE(newChildList);
SAFE_RELEASE(pNewChild);
return hr;

Answer 1

appendChild 将节点移动到别处，每次都将子列表减一。

试试这个:

// reverse loop from index base 0 "len-1" to 0
for(long count=len-1;count>=0;--count)

附带说明一下，您泄漏了大量内存(outNewChild 和 newName)