请教用XMLHttp的get_responseXML如何能拿到IXMLDOMDocument2Ptr

请问用XMLHttp的get_responseXML怎么能拿到IXMLDOMDocument2Ptr
请问怎么用IXMLHTTPRequestPtr的get_responseXML获得IXMLDOMDocument2Ptr并把其中的XML文本内容显示出来？

我的代码如下:

IXMLHTTPRequestPtr xmlrequest;

LRESULT hr=xmlrequest.CreateInstance("Msxml2.XMLHTTP");
if(!SUCCEEDED(hr))
{
std::cout<<"无法创建XMLHTTP对象，请检查是否安装了MS XML运行库! "<<std::endl;
}

_variant_t varp(false);

xmlrequest->open(_bstr_t("POST"),_bstr_t

("http://192.168.1.81/Interface/CheckPrivilege.aspx"),varp); //varp参数表明方法是否异步

xmlrequest->send(_bstr_t

("<Level><LevelName>XXXX</LevelName><LevelPass>XXXXX</LevelPass></Level>"));

IXMLDOMDocument2Ptr pXMLDom;
hr=pXMLDom.CreateInstance(__uuidof(DOMDocument40));
if(FAILED(hr))
{
std::cout<<"Failed to instantiate DOMDocument40 class!"<<std::endl;
return -1;
}

xmlrequest->get_responseXML((IDispatch**)&pXMLDom);
std::cout<<static_cast<char*>(pXMLDom->xml)<<std::endl;

这样做什么内容都显示不出来,
不过如果我加上
BSTR bstrbody;
xmlrequest->get_responseText(&bstrbody);
pXMLDom->loadXML(bstrbody);
的话就能正常显示其中内容了

求助！非得费这二遍事么？如何直接用get_responseXML获得IXMLDOMDocument2Ptr并将其中内容显示出来？

------解决方案--------------------

C/C++ code


#include <stdio.h>
#include <iostream.h>

// If neccessary, change the file path if your msxml.dll file is
// in a different location.

#import "c:\windows\system32\msxml.dll"

// To use MSXML 4.0, import the dll msxml4.dll instead of msxml.dll, as follows:
// #import "c:\windows\system32\msxml4.dll"
// using namespace MSXML2;

using namespace MSXML;
int main(int argc, char* argv[])
{
   CoInitialize(NULL);
   try
   {
      // Variables.
      bstr_t sUrl = "http://Server/public/TestFolder1/test.eml";
      bstr_t sMethod = "PROPFIND";
      _variant_t vUser = L"Domain\\Username";
      _variant_t vPassword = L"!Password";
      _variant_t vAsync = (bool)FALSE;
      bstr_t sReq;
      long lStatus;
      BSTR bstrResp;
      BSTR bstrResponseText;
      HRESULT hr;

      // If you are using MSXML 2.0, use the following to initialize pXMLHttpReq:
      MSXML::IXMLHttpRequestPtr pXMLHttpReq=NULL;

      // If you are using MSXML 4.0, use the following to initialize pXMLHttpReq:
      //MSXML2::IXMLHTTPRequestPtr pXMLHttpReq=NULL;

      // Initialize the XMLHTTPRequest object pointer.
      hr = pXMLHttpReq.CreateInstance(__uuidof(XMLHTTPRequest));

      // Check the status of pointer creation.
      if (S_OK != hr)
      {
         cout<< "XML Http Request pointer creation failed. << endl;
         return 1;
      }

      // Open the XMLHTTPRequest object with the PROPFIND method and
      // specify that it will be sent asynchronously.
      pXMLHttpReq->open(sMethod,
                        sUrl,
                        vAsync,
                        vUser,
                        vPassword);

      // Set the Content-Type header to "text/xml".
      pXMLHttpReq->setRequestHeader((bstr_t)"Content-Type",
                                    (bstr_t)"text/xml");


      // Build the request body and search for the display name of the
      // item.
      sReq = "<?xml version='1.0'?>";
      sReq = sReq +  "<d:propfind xmlns:d='DAV:'><d:prop>" +
             "<d:displayname/></d:prop></d:propfind>";

      // Send the PROPFIND method request.
      pXMLHttpReq->send(sReq);

      // Get the method request status.
      pXMLHttpReq->get_status(&lStatus);

      // An error occurred on the server.
      if(lStatus >= 500)
      {
         pXMLHttpReq->get_statusText(&bstrResp);
         cout << "Status: " << lStatus << endl
              << "Status text: An error occurred on the server."
          << endl
              << (char*)(bstr_t)bstrResp
              << endl;
      }

     // The method request was successful.
     else if(lStatus == 207)
     {
        // Variables.
        MSXML::IXMLDOMDocumentPtr pDOMDoc = NULL;
        MSXML::IXMLDOMNodeListPtr pDOMNodeList = NULL;
        MSXML::IXMLDOMNodePtr pDOMNode = NULL;
        BSTR bstrText;

        // Create an instance of the DOM Document.
        HRESULT hr = pDOMDoc.CreateInstance(__uuidof(DOMDocument));

        // Check the status of pointer creation.
        if(FAILED(hr))
           cout<<"Creation of DOMDocument failed."<<endl;

        // Get the method response XML text.
        pXMLHttpReq->get_responseText(&bstrText);

        // Load the XML document with the response text.
        pDOMDoc->loadXML(bstrText);

        // Build a list of the DAV:displayname XML nodes (there should
        // be only one) corresponding to the folders returned in the
        // search request. The DAV: namespace is typically assigned
        // the a: prefix in the XML response body.
        pDOMNodeList = pDOMDoc->getElementsByTagName((bstr_t)"a:displayname");

        // Display the display name of the resource.
        pDOMNode = pDOMNodeList->nextNode();
        cout << pDOMNode->text << endl;

     }

     else
     {
        // Display the response status.
        cout << "Status: " << lStatus << endl;

        // Display the response status text.
        pXMLHttpReq->get_statusText(&bstrResp);
        cout << "Status text: " << (char*)(bstr_t)bstrResp << endl;

        // Display the response text.
        pXMLHttpReq->get_responseText(&bstrResponseText);
        cout << "Response text: " << (char*)(bstr_t)bstrResponseText << endl;
     }

   }
   catch(_com_error &e)
   {
      // Display the error information.
      cout << "Error code: " << (char*)e.Error() << endl
           << "Error message: " << (char*)e.ErrorMessage()
           <<endl;

      return 1;
   }

   CoUninitialize();

   return 0;
}

请教用XMLHttp的get_responseXML如何能拿到IXMLDOMDocument2Ptr

相关推荐