Cannot convert 'IXMLNodeList' to '_di_IXMLNodeList' 求助

[liu_huasheng]

void __fastcall TForm1::Button1Click(TObject *Sender)
{
String str;
_di_IXMLDocument XMLDoc;
XMLDoc = NewXMLDocument();
XMLDoc->LoadFromFile((WideString)"D:\\Request.xml");

_di_IXMLNode node = XMLDoc->DocumentElement->ChildNodes[0];//此句出错
str =readxml(node);//调用一个函数
ShowMessage(str);
}
[C++ Error]:Cannot convert 'IXMLNodeList' to '_di_IXMLNodeList'

添加了#include <XMLDoc.hpp>，并且我没用TXMLDocument控件啊，求解

[ccrun.com]

_di_IXMLNode node = XMLDoc->DocumentElement->ChildNodes[0]; 改成:

_di_IXMLNode node = XMLDoc->DocumentElement->ChildNodes->Nodes[0];