VC 中读取XML的问题！！请高人解答！！

XML code:

<?xml version="1.0" ?>
<PMP>
<Setup>
<Power>
<PowerOff value="0" />
<LCDOff value="0" />
</Power>
<Battery>
<LCDOff value="0" />
<PowerOff value="0" />
</Battery>
<MosaicSize>
<VideoMosaicSize value="7" />
<PhotoMosaicSize value="4" />
</MosaicSize>
<ScreenSaver>
<ScreenSaver value="0" />
<SaverChoice value="1" />
</ScreenSaver>
</Setup>
</PMP>




以上是XML的文件，现在要在文件中读取  <VideoMosaicSize value="7" /> 求出value的值，

C/C++ code:

IXMLDOMDocument2Ptr xml;
xml.CreateInstance(__uuidof(MSXML2::DOMDocument));
xml->load("E:\\boot1.xml");
CStringArray timeA, codeA;

IXMLDOMNodePtr node;
IXMLDOMElementPtr Elemen;
CString strRoot;
strRoot = "/PMP/Setup/ScreenSaver";
node=xml->selectSingleNo