if (SUCCESS != ISHELL_CreateInstance(pMe->a.m_pIShell, AEECLSID_FILEMGR, (void **)&pMe->pfm))
 {
  IAPPLET_Release((IApplet*)pMe);
  return TRUE;
 }

 if (SUCCESS != ISHELL_CreateInstance(pMe->a.m_pIShell,AEECLSID_WEBUTIL,(void **)&pMe->pIWebUtil))
 {
  pMe->pIWebUtil = NULL;
  return TRUE;
 }
//初始化回調(diào)
CALLBACK_Init(&pMe->WebCBStruct, IWebCB, pMe); // out, in, in


//IWebCB函數(shù)定義
void IWebCB (iweb* pMe) {
 // get info about the response
 pMe->pWebRespInfo = IWEBRESP_GetInfo(pMe->pIWebResp);
 // 5.a check error code
 if (!WEB_ERROR_SUCCEEDED(pMe->pWebRespInfo->nCode))
 { 
 return;
 }
 // 5.b get pointer to Source object
 pMe->pISource = pMe->pWebRespInfo->pisMessage;
 if (pMe->pISource == NULL)
 {
  return;
 }
 // 5.c register Isource Read callback
 CALLBACK_Init(&pMe->WebCBStruct, ReadFromWebCB, pMe); // out, in, in
 // 5.d post a read; data is processed by ISource callback
 ISOURCE_Readable(pMe->pISource, &pMe->WebCBStruct);
 return;
}

void ReadFromWebCB(iweb* pMe)
{
 AECHAR szText[] = {'D','o','w','n','l','o','a','d', ' ','F', 'i', 'n', 'i','s','h','\0'};
 char buf[1024]; // allocate buffer
 int byteCount;
 // read data from stream; get number of bytes read
 byteCount = ISOURCE_Read(pMe->pISource, (char*)buf, sizeof(buf));
 switch (byteCount) {
  case ISOURCE_WAIT: // Buffer empty, but more data expected // post another read
   ISOURCE_Readable(pMe->pISource,&pMe->WebCBStruct);
   return;
  case ISOURCE_ERROR: // Error occurred ProcessError(…);
  case ISOURCE_END: // Buffer empty; all data received ProcessData(…);
   IDISPLAY_DrawText(pMe->a.m_pIDisplay,    // Display instance
                           AEE_FONT_BOLD,       // Use BOLD font
                           szText,              // Text - Normally comes from resource
                           -1,                  // -1 = Use full string length
                           0,                   // Ignored - IDF_ALIGN_CENTER
                           0,                   // Ignored - IDF_ALIGN_MIDDLE
                           NULL,                // No clipping
                           IDF_ALIGN_CENTER | IDF_ALIGN_MIDDLE);
   IDISPLAY_Update(pMe->a.m_pIDisplay);
   return;
  default: // data read; copy from chunk buffer 
    IFILE_Write(pMe->pIFile,buf,byteCount);
   // post another read
   ISOURCE_Readable(pMe->pISource,&pMe->WebCBStruct);
   return;
 }
}

//http請求頭的設(shè)置
{
int    i = 0;
      WebOpt awo[10];

      // set the IWeb connect timeout to 10 seconds.  this also sets the
      // failover timeout, if unset, or set to 0, IWeb uses the system
      // default (30 seconds unless an OEM changes it)
      awo[i].nId  = WEBOPT_CONNECTTIMEOUT;
      awo[i].pVal = (void *)100000;
      i++;

      // test user-agent, uncomment this section to ship your own user-agent
      // string. if unset, IWeb will send a default.  If set to NULL, no
      // user agent header will be sent */

      // Set TEST_USER_AGENT in the NetDiagnostics project settings to all
      // shipping of your own user agent.

#ifdef TEST_USER_AGENT
      awo[i].nId  = WEBOPT_USERAGENT;
      awo[i].pVal = (void *)WEBBER_USERAGENT;
      i++;
#endif

      // test nowaitconn, this only comes into effect if you build webber
      // with multiple WebActions (see the definition of struct Webber)
      awo[i].nId  = WEBOPT_FLAGS;
      awo[i].pVal = (void *)WEBREQUEST_NOWAITCONN;
      i++;
     

      // test forcenew, uncomment this section to try multiple simultaneous
      // "forced" new connections. Forced new connections are not kept alive
      // unless they are the first forced new connection to a host
#ifdef TEST_FORCENEWCONN
      awo[i].nId  = WEBOPT_FLAGS;
      awo[i].pVal = (void *)WEBREQUEST_FORCENEWCONN;
      i++;
#endif

      // turn off HTTP over HTTP proxying
      awo[i].nId  = WEBOPT_PROXYSPEC;
      awo[i].pVal = (void *)"http:///";
      i++;

      // turn on ALL proxying.  Proxyspecs are examined in WebOpt
      // order, so in this list, with the above and below PROXYSPECs,
      // everything except HTTP will be proxied through
      // http://webproxy.yourdomain.com:8080, (which you'll have to
      // set up to test, sorry
      awo[i].nId  = WEBOPT_PROXYSPEC;
      awo[i].pVal = (void *)"*:///http://192.168.1.46:80";
      i++;

      // Marks the end of the array of WebOpts
      awo[i].nId  = WEBOPT_END;
     
      // Add Options
      IWEB_AddOpt(pApp->m_pIWeb,awo);
   }

   // Initialize all my WebActions to point to  applet
    FOR_ALL_WEBACTIONS(pApp, p, p->pParent = pApp);


//打開或建立接收響應(yīng)數(shù)據(jù)的文件
pMe->pIFile = IFILEMGR_OpenFile(pMe->pfm, "Rev.txt", _OFM_READWRITE);
 if (NULL == pMe->pIFile)
 {
  pMe->pIFile = IFILEMGR_OpenFile(pMe->pfm, "Rev.txt", _OFM_CREATE);
  if (NULL == pMe->pIFile)
  {
   int Result = GETLASTFPERROR();
   return FALSE;
  }
 }
2.發(fā)送請求：其響應(yīng)消息在回調(diào)函數(shù)ReadFromWebCB中接收，IWeb狀態(tài)、
IWEB_GetResponse(pMe->pIWeb,
   (pMe->pIWeb,
   &pMe->pIWebResp,
   &pMe->WebCBStruct,
   m_gOutURL,
   //WEBOPT_HEADER,"GET /vt/v=w2.119&hl=zh-CN&gl=cn&x=53399&y=28435&z=16&s=Gali HTTP/1.0\r\nAccept:*/*\r\nX-Method:GET\r\nHost:203.208.37.99",
WEBOPT_HEADERHANDLER, WebAction_Header,
   WEBOPT_STATUSHANDLER, WebAction_Status,
   WEBOPT_END))
這里也可以直接設(shè)置這個請求頭（WEBOPT_HEADER）、請求消息（WEBOPT_BODY），如上所示。Method默認(rèn)的就是GET,
WEBOPT_STATUSHANDLER表示后面的WebAction_Status回調(diào)函數(shù)（功能是IWeb狀態(tài)）、WEBOPT_HEADERHANDLER的用法和
上面的WEBOPT_STATUSHANDLER的用法一樣，后面跟的是服務(wù)端返回消息的回調(diào)函數(shù)，如下所示。

//IWeb 狀態(tài)
static void WebAction_Status(void *p, WebStatus ws, void *pVal)
{
 char *pszStatus = NULL;