author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-8C5A65E6-D753-472F-B885-FD0409589036" xml:lang="en"><title>HTTP |
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Whole Message Filter Example</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The following diagram illustrates the class relationship between the <codeph>MHTTPDataOptimiser</codeph> interface |
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and the <codeph>RHTTPSession</codeph> class: </p> |
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<fig id="GUID-25859A19-F3C8-5FBD-B491-C58E5C973424"> |
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<title> Class relationship between MHTTPDataOptimiser and |
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RHTTPSession </title> |
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<image href="GUID-9DCAB1DC-D085-576C-A0B9-713E3BF2CAD5_d0e186197_href.png" placement="inline"/> |
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</fig> |
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<p>For more information about <xref href="GUID-F34F7481-00CF-3A1B-8D45-D053AD6769A8.dita"><apiname>MHTTPTransactionCallback</apiname></xref>, |
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see <xref href="GUID-1D32D093-1B7B-5CE8-B57D-5469C1E8E4B9.dita">A simple HTTP Client |
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session</xref>. </p> |
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<p>The following code segment illustrates how to define the header file required |
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for implementing the HTTP Whole Message Filter APIs: </p> |
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<codeblock id="GUID-1D7FA528-68D6-5AEE-B9F3-CBACC03855AB" xml:space="preserve">#include <http.h> |
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class CMyHTTPClient: public CBase, |
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public MHTTPTransactionCallback, |
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public MHttpDataOptimiser |
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{ |
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public: // methods from MHTTPTransactionCallback |
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virtual void MHFRunL(RHTTPTransaction aTransaction, const THTTPEvent& aEvent); |
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virtual TInt MHFRunError(TInt aError, RHTTPTransaction aTransaction, const THTTPEvent& aEvent); |
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public: // methods from MHttpDataOptimiser |
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virtual void EncodeL (const TDesC8& aHttpData, HBufC8*& aEncodedData); |
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virtual void DecodeL (const TDesC8& aData, HBufC8*& aHttpData, TBool& aTransFail); |
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};</codeblock> |
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<p>The following code segment illustrates how HTTP Whole Message Filter APIs |
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can be used to enable support for Web Acceleration: </p> |
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<codeblock id="GUID-2F062305-2D15-534C-8239-FAE4002DB79E" xml:space="preserve">#include "CMyHTTPClient.h" |
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// CMyHTTPClient.cpp |
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// |
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// defines CMyHTTPClient class: CMyHTTPClient |
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// Literals used in the file |
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_LIT8(KHttpAuthenticationUrl, "http://remix.kwed.org"); |
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void CMyHTTPClient::CreateTransactionL() |
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{ |
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TUriParser8 up; |
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up.Parse(KHttpAuthenticationUrl); |
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RHTTPSession session; |
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RHTTPTransaction trans; |
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// Open the HTTP session |
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session.OpenL(); |
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CleanupClosePushL(session); |
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RStringPool strP = session.StringPool(); |
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//To enable MHTTPDataOptimiser for transaction |
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// Open a GET transaction, specifying this object as the request body data supplier |
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trans = session.OpenTransactionL(up, *this, strP.StringF(HTTP::EGET,RHTTPSession::GetTable())); |
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CleanupClosePushL(trans); |
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trans.SetupHttpDataOptimiser(*this); |
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trans.SubmitL(); |
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CleanupStack::PopAndDestroy(&trans); |
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CActiveScheduler::Start(); |
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CleanupStack::PopAndDestroy(&session); //Closes the session |
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} |
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TInt CMyHTTPClient::MHFRunError(TInt aError, RHTTPTransaction aTransaction, const THTTPEvent& aEvent) |
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{ |
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// Handle Error appropriately |
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} |
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void CMyHTTPClient::MHFRunL(RHTTPTransaction aTransaction, const THTTPEvent& aEvent) |
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{ |
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// Handle events from the framework. |
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switch (aEvent.iStatus) |
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{ |
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case KErrHttpOptimiserFailsTrans: |
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{ |
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INFO_PRINTF1(_L("Cancelling/Failing Transaction\n")); |
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aTransaction.Fail(THTTPFilterHandle::EProtocolHandler); |
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} break; |
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} |
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return; |
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//The following statement is used to eliminate leavescan errors |
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User::Leave(KErrGeneral); |
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} |
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void CMyHTTPClient::EncodeL (const TDesC8& aHttpData, HBufC8* &aEncodedData) |
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{ |
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//Provide your own custom encoding implementation |
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} |
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void CMyHTTPClient::DecodeL (const TDesC8& aData, HBufC8*& aHttpData, TBool& aTransFail) |
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{ |
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//Provide your own custom decoding implementation |
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}</codeblock> |
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<p>This code enables the <codeph>MHTTPDataOptimiser</codeph> for a transaction |
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by using <codeph>RHTTPTransaction::SetupHTTPDataOptimiser()</codeph> and also |
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illustrates where custom encoding and decoding mechanisms are implemented. </p> |
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<p> <b>Note:</b> Alternatively, in this code, you can use the following code |
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segment to enable <codeph>MHTTPDataOptimiser</codeph> for a particular session. </p> |
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<p> <codeph>session.SetupHttpDataOptimiser(*this); </codeph> </p> |
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</conbody></concept> |