win32 编码转化函数

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<?xml version="1.0" encoding="GBK"?>
<chat id="1398034731" isAttach="0">
<sendtime>2011-10-29 14:11:53</sendtime>
<attach/>
<context><![CDATA[%3cP%3e%e4%bd%a0%e5%a5%bd%3c/P%3e]]></context>
</chat>

void CRRRDlg::OnBtnXml()
{
// TODO: Add your control notification handler code here
char Chat[500]="<?xml version=\"1.0\" encoding=\"GBK\"?><chat id=\"1814936736\" isAttach=\"0\"><sendtime>2011-10-17 19:01:23</sendtime><attach/><context><![CDATA[%3cP%3e%e4%bd%a0%e5%a5%bd%3c/P%3e]]></context></chat>";
CString str;

MSXML2::IXMLDOMDocumentPtr pDoc;

HRESULT hr = pDoc.CreateInstance(__uuidof(MSXML2::DOMDocument40));
if(!SUCCEEDED(hr))
{
  MessageBox("无法创建DOMDocument对象，请检查是否安装了MS XML Parser 运行库!");
  return;
}
pDoc-> put_async(VARIANT_FALSE);
pDoc-> put_validateOnParse(VARIANT_FALSE);
pDoc-> put_resolveExternals(VARIANT_FALSE);
pDoc-> put_preserveWhiteSpace(VARIANT_TRUE);
pDoc-> loadXML((_bstr_t)Chat);   //加载文件

// if(pDoc == NULL)
// {
//   return;
// }

// MSXML2::IXMLDOMNodeListPtr pNodeList = NULL;
  MSXML2::IXMLDOMNodePtr pNode = NULL;
MSXML2::DOMNodeType nodeType;
//取父节点在树中查找名为Book的节点,"//"表示在任意一层查找
  pNode=pDoc->selectSingleNode("//context");
// pNodeList = pNode-> GetchildNodes(); //得到子节点

//得到节点类型
pNode->get_nodeType(&nodeType);

//节点名称
CString strName;
strName=(char *)pNode->GetnodeName();
// if(pNodeList == NULL)
// {
//   return;
// }

_bstr_t strVisiPort=pNode->Gettext();
str=MultiByteToWideChar(NULL,0,strVisiPort,-1,NULL,0);

GetDlgItem(IDC_EDIT)->SetWindowText(str);

}