关于读XML字串的一个小问题。

[door_proxy]

VB中：
dim doc
set doc = CreateObject("Microsoft.MSXML2")
dim str as string
str = "<root><a>aa</a><a>bb</a></root>"
doc.loadXML str
dim list as IXMLDOMNodeList
set list = doc.getElementByName("a")
dim length as integer
length = list.length //可以得到length的值为2

VC中：
pDoc指针已经正常获得
IXMLDOMNodeList *list;
list = pDoc->getElementByName("a") //list指针的值已经有了，一般都是同一个值0x008a4500
int len = list.length; //得到的值始终为0，哪位大侠知道怎么回事

[蒋晟]

默认的Load是异步的

[bjskyhorse]

你在没save之前，load的内容还是以前的内容。它不是动态更新的

[door_proxy]

那该怎么做？

[door_proxy]

不管异步还是同步，VB行的VC就不行？

[dingpiao]

没干过,up

[蒋晟]

异步的意思就是你要等待事件再访问XML DOM
你也可以用同步模式，这样Load调用之后就可以读DOM了

[door_proxy]

高手来呀

[door_proxy]

晕

[anothervip]

getElementsByTagName?

msdn上的例子：

<?xml version='1.0'?>
<COLLECTION
xmlns:dt="urn:schemas-microsoft-com:datatypes">
<DATE dt:dt="datetime">1998-10-13T15:56:00</DATE>
<BOOK>
<TITLE>Lover Birds</TITLE>
<AUTHOR>Cynthia Randall</AUTHOR>
<PUBLISHER>Lucerne Publishing</PUBLISHER>
</BOOK>
<BOOK>
<TITLE>The Sundered Grail</TITLE>
<AUTHOR>Eva Corets</AUTHOR>
<PUBLISHER>Lucerne Publishing</PUBLISHER>
</BOOK>
<BOOK>
<TITLE>Splish Splash</TITLE>
<AUTHOR>Paula Thurman</AUTHOR>
<PUBLISHER>Scootney</PUBLISHER>
</BOOK>
</COLLECTION>

#import "msxml3.dll"
using namespace MSXML2;

inline void TESTHR( HRESULT _hr )
{ if FAILED(_hr) throw(_hr); }

void XMLDOMNodeListSample()
{
try {
IXMLDOMDocumentPtr docPtr;
IXMLDOMNodeListPtr NodeListPtr;
IXMLDOMNodePtr DOMNodePtr;

//init
TESTHR(CoInitialize(NULL));
TESTHR(docPtr.CreateInstance("Msxml2.DOMDocument.5.0"));

// load a document
_variant_t varXml("C:\\book.xml");
_variant_t varOut((bool)TRUE);
varOut = docPtr->load(varXml);
if ((bool)varOut == FALSE)
throw(0);
NodeListPtr = docPtr->getElementsByTagName("AUTHOR");
MessageBox(NULL, _bstr_t(NodeListPtr->length), _T("Node List length"), MB_OK);
} catch(...)
{
MessageBox(NULL, _T("Exception occurred"), _T("Error"), MB_OK);
}
CoUninitialize();
}

[HelloIvan2005]

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