c++ - IStream 到 MSXML DOMDocument

Question

有没有一种简单的方法可以获取 XML 文档的 IStream，然后将其加载到 IXMLDOMDocument (msxml) 中？最好不要将流写入磁盘。

Answer 1

检查 this出去! More example .

安std::istream基于 ISequentialStream实现示例:link . ( ISequentialStream 是 IStream 的基类)。

// 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