100分，请教个c++调用xmlhttprequest object问题

[ayw215]

最近需要用c++对xmlhttprequest object的属性和方法进行简单的封装
但是不知道怎么下手。。。
xmlhttprequest 是不是一个com对象？
有做过相关东西的xd可以给点代码框架做做示例么？
谢谢~~

[oyljerry]

#include   "stdafx.h"  
  #import   "msxml4.dll"  
  const   char*   testurl="http://expert.csdn.net/Expert/topic/1721/1721161.xml?temp=.3921778";  
  #define   ODS   OutputDebugString  
  #define   WM_USER_STARTWALKING ((WM_USER)   +   1)  
  using   namespace   MSXML2;  
   
  class   CXMLSink   :   public   IDispatch  
  {  
  public:  
  CXMLSink()   :   m_dwRef(1),m_pEventSource(NULL){ }  
  ~CXMLSink()  
  {  
  if(m_pEventSource)  
  m_pEventSource->Release();  
  m_pEventSource=NULL;  
  }  
  //   IUnknown   methods  
  STDMETHOD(QueryInterface)(REFIID   riid,   LPVOID*   ppv)  
  {  
  ODS("QueryInterface");  
  *ppv   =   NULL;  
  if   (IID_IUnknown   ==   riid)  
  {  
  *ppv   =   (LPUNKNOWN)this;  
  AddRef();  
  return   NOERROR;  
  }  
  else   if   (IID_IDispatch   ==   riid)  
  {  
  *ppv   =   (IDispatch*)this;  
  AddRef();  
  return   NOERROR;  
  }  
  else  
  return   E_NOTIMPL;  
  }  
   
  STDMETHOD_(ULONG,   AddRef)(){   return   ++m_dwRef;}  
  STDMETHOD_(ULONG,   Release)()  
  {  
  if   (--m_dwRef   ==   0)  
  {  
  delete   this;  
  return   0;  
  }  
  return   m_dwRef;  
  }  
  //   IDispatch   method  
  STDMETHOD(GetTypeInfoCount)(UINT*   pctinfo)  
  {   ODS("GetTypeInfoCount\n");   return   E_NOTIMPL;   }  
  STDMETHOD(GetTypeInfo)(UINT   iTInfo,  
  LCID   lcid,  
  ITypeInfo**   ppTInfo)  
  {   ODS("GetTypeInfo\n");   return   E_NOTIMPL;   }  
  STDMETHOD(GetIDsOfNames)(REFIID   riid,  
  LPOLESTR*   rgszNames,  
  UINT   cNames,  
  LCID   lcid,  
  DISPID*   rgDispId)  
  {   ODS("GetIDsOfNames\n");   return   E_NOTIMPL;   }                  
  STDMETHOD(Invoke)(DISPID   dispIdMember,  
  REFIID   riid,  
  LCID   lcid,  
  WORD   wFlags,  
  DISPPARAMS   __RPC_FAR   *pDispParams,  
  VARIANT   __RPC_FAR   *pVarResult,  
  EXCEPINFO   __RPC_FAR   *pExcepInfo,  
  UINT   __RPC_FAR   *puArgErr)  
  {  
  ODS("Invoke");  
  MSXML2::IXMLHTTPRequestPtr   xmldom(m_pEventSource);  
  if(xmldom)  
  {  
  long   lReadyState;  
  xmldom->get_readyState(&lReadyState);  
  char   buf[256];  
  wsprintf(buf,"get_readystate   return   %d",lReadyState);  
  ODS(buf);  
  if(lReadyState==4)  
  {  
  BOOL   fRet   =   PostThreadMessage(GetCurrentThreadId(),  
  WM_USER_STARTWALKING,  
  (WPARAM)0,  
  (LPARAM)0);  
  OutputDebugString("DISPID_XMLDOMEVENT_ONREADYSTATECHANGE   event   fired");  
  }  
  }  
  return   NOERROR;  
  }  
  void   SetEventSource(IUnknown*   punk){   m_pEventSource=punk;if(punk)   punk->AddRef();}  
  protected:  
  IUnknown*   m_pEventSource;  
  DWORD   m_dwRef;  
  };  
   
  void   test2()  
  {  
  CXMLSink   xmlsink;  
  IXMLHTTPRequestPtr   xmlrequest;  
  xmlrequest.CreateInstance("Msxml2.XMLHTTP.4.0");  
  _variant_t   varp(true);  
  xmlrequest->put_onreadystatechange((IDispatch*)&xmlsink);  
  xmlsink.SetEventSource(xmlrequest);  
  xmlrequest->open(_bstr_t("GET"),_bstr_t(testurl),varp);  
  xmlrequest->send();  
  MSG   msg;  
  while   (GetMessage(&msg,   NULL,   0,   0))  
  {  
  if   (WM_USER_STARTWALKING   ==   msg.message   &&   NULL   ==   msg.hwnd)  
  {  
  break;  
  }  
  else  
  {  
  DispatchMessage(&msg);  
  }  
  }  
  BSTR   bstrbody;  
  xmlrequest->get_responseText(&bstrbody);  
  if(bstrbody)  
  {  
  _bstr_t   bstrtbody(bstrbody);  
  printf("%s\n",(LPCTSTR)bstrtbody);  
  }  
  }  
  int   main(int   argc,   char*   argv[])  
  {  
  printf("IXMLHTTPRequest   asynchronous   code   snippet   by   masterz.\n");  
  printf("build   with   VC.NET,   WindowsXP,   IE6.0+SP1,   MSXML4.0SP2\n");  
  CoInitialize(NULL);  
  try  
  {  
  test2();  
  }  
  catch   (_com_error   &e)  
  {  
  printf("Description   =   '%s'\n",   (char*)   e.Description());  
  }  
  CoUninitialize();  
  printf("program   end\n");  
  return   0;  
  }

[skyxie]

呵呵,其实MSDN中有很多 IXMLHTTPRequest 例子的 ~
MSDN中基本每个方法/属性都有例子, 比如下面这个.

你要封装的话,肯定每一个方法/属性都要覆盖倒~ 只有翻MSDN (或者MSXML SDK)

#import "msxml3.dll"
using namespace MSXML2;

void XMLHttpRequestSample()
{
IXMLHTTPRequestPtr pIXMLHTTPRequest = NULL;
BSTR bstrString = NULL;
HRESULT hr;

try {
hr=pIXMLHTTPRequest.CreateInstance("Msxml2.XMLHTTP.3.0");
SUCCEEDED(hr) ? 0 : throw hr;

hr=pIXMLHTTPRequest->open("GET", "http://localhost/books.xml ", false);
SUCCEEDED(hr) ? 0 : throw hr;

hr=pIXMLHTTPRequest->send();
SUCCEEDED(hr) ? 0 : throw hr;

bstrString=pIXMLHTTPRequest->responseText;

MessageBox(NULL, _bstr_t(bstrString), _T("Results"), MB_OK);

if(bstrString)
{
::SysFreeString(bstrString);
bstrString = NULL;
}

} catch (...) {
MessageBox(NULL, _T("Exception occurred"), _T("Error"), MB_OK);
if(bstrString)
::SysFreeString(bstrString);
}

}

[eagerle01]

帮顶

[ZOthello]

是来学习的，帮顶~~

[wwwhhb4001]

mark

[norsd]

我自己就做了一个xmlhttprequest封装，因为是一个本地xmlhttprequest 所以可以跨域，然后做一个接口给js用，很爽。