IStream转MSXML DOMDocument

有没有一种简单的方法可以让我获取一个XML文档的IStream，然后将其加载到一个XMLDOMDocument(msxml)中？最好不要把流写到磁盘上。

解决方案：

查看 这个 出! 更多例子.

安 std::istream 基于 ISequentialStream 实施例。链接. (ISequentialStream 的基类。IStream).

// VARIANT_TRUE != TRUE !!!!!!!!!!!
VARIANT_BOOL retval = VARIANT_TRUE;
// document object created by CoCreateInstance
IXMLDOMDocument* xml_doc;
// own ISequentialStream/IStream instance (like example)
ISequentialStream* streamaddress;
// variant: could be IStream, ISequentialStream or IPersistStream
VARIANT xmlSource;
// variant init
VariantInit(&xmlSource);
// your object is an IUnknown interface
xmlSource.vt = VT_UNKNOWN;
// set its address
xmlSource.punkVal = streamaddress;
// load XML from stream
if ( ( xml_doc->load(xmlSource,&retval) == S_OK ) && ( retval == VARIANT_TRUE ) ) {
  // done
}

VARIANT_TRUE