存储HTTP的cookies

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文章信息

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兼容于

平台: S60 3rd Edition (initial release) to FP2

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文章

翻译:

翻译自: Archived:Storing HTTP cookies using Symbian C++

由 huwell

最后由 hamishwillee 在 09 Aug 2012 编辑

• 详细描述

这里cookie是指从服务器端像客户端（浏览器）发送的一段信息。客户端可以存储在本地，并在请求时将此发回服务器。

根据cookie的类型可以将其长期存储或短期存储。Cookies用来包括指定会话下的登录或注册信息。

S60可以将cookie存储在Cookie管理组件中的一个私有文件夹中。如果第三方想访问这些cookie，则需要AllFiles权限。

• 解决方案

下列代码片段演示一个客户端如何解析http返回的头中有关cooke信息存储的内容：

_LIT8(KAccept, "*/*");
 _LIT8(KAtext, "text/plain");
 
 // Get request method string for HTTP GET
 RStringF method =
   iSession.StringPool().StringF(HTTP::EGET,RHTTPSession::GetTable());  
 iTransaction = iSession.OpenTransactionL(uri, *this, method);
 RHTTPHeaders hdr = iTransaction.Request().GetHeaderCollection();
 SetHeaderL(hdr, HTTP::EUserAgent, KUserAgent);
 SetHeaderL(hdr, HTTP::EAccept, KAccept);
 SetHeaderL(hdr, HTTP::ECookie, KAtext);
 SetHeaderL(hdr, HTTP::ECookieName, KAtext);
 SetHeaderL(hdr, HTTP::ECookieValue, KAtext);

void CClientEngine::SetHeaderL(RHTTPHeaders aHeaders,
                                TInt aHdrField,
                                const TDesC8& aHdrValue)
   {
   RStringF valStr = iSession.StringPool().OpenFStringL(aHdrValue);
   CleanupClosePushL(valStr);
   THTTPHdrVal val(valStr);
   aHeaders.SetFieldL(iSession.StringPool().StringF(aHdrField,
     RHTTPSession::GetTable()), val);     
   CleanupStack::PopAndDestroy(); 
   }
 
 
 void CClientEngine::MHFRunL(RHTTPTransaction aTransaction,
                             const THTTPEvent& aEvent)
   { 
   switch (aEvent.iStatus)
     {    
     case THTTPEvent::EGotResponseHeaders:
       {		
       RHTTPResponse resp1 = aTransaction.Response();
       RStringPool strP = aTransaction.Session().StringPool();
       RHTTPHeaders hdr = resp1.GetHeaderCollection();
       THTTPHdrFieldIter it = hdr.Fields();
       TBuf<512> fieldName16;
       TBuf<512> fieldVal16;
 
       while (it.AtEnd() == EFalse)
         {
         // Get the name of the next header field <br>
         RStringTokenF fieldName = it();
         RStringF fieldNameStr = strP.StringF(fieldName);
 
         // Check it does indeed exist
         THTTPHdrVal fieldVal;
         if (hdr.GetField(fieldNameStr,0,fieldVal) == KErrNone)
           {  
           RStringF wwwCookie = strP.StringF(
             HTTP::ESetCookie, RHTTPSession::GetTable());
           TInt mycookieCount = hdr.FieldPartsL(wwwCookie); 
 
           if (fieldNameStr == wwwCookie)
             {      
             RStringF nameValStr;
             RStringF valueValStr;
 
             // Check the cookie name and value
            RStringF name = strP.StringF(
              HTTP::ECookieName, RHTTPSession::GetTable());
            RStringF value = strP.StringF(HTTP::ECookieValue,
              RHTTPSession::GetTable());
 
            THTTPHdrVal nameVal, valueVal;
            if (hdr.GetParam(wwwCookie, name, nameVal) == KErrNone)
              {          	
              nameValStr = strP.StringF(nameVal.StrF());
              fieldName16.Copy(nameValStr.DesC());
              }
            if (hdr.GetParam(wwwCookie, value, valueVal) == KErrNone)
              {          	
              valueValStr = strP.StringF(valueVal.StrF());
              fieldVal16.Copy(valueValStr.DesC());
              }
 
             ...
             // Create a cookie object with name, value and URI and save
             // it as a file (for example, to app. private directory)
             // URI can be obtained with:
             // const TUriC8& requestUri = aTransaction.Request().URI();
             }
           }
         // Advance the iterator
         ++it;
         }
       break;
       }
       ...
     }
   }