Symbian3/PDK/Source/GUID-3B2FB34B-B4FC-5273-AE35-DADA2FA4C419.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
parent 14 578be2adaf3e
permissions -rw-r--r--
Initial contribution of the Adaptation Documentation.
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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-3B2FB34B-B4FC-5273-AE35-DADA2FA4C419" xml:lang="en"><title>Using
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ClientMessage Framework</title><shortdesc>This section explains how to use the ClientMessage framework to
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sanitize the incoming messages. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section><title>Procedure</title> <ol id="GUID-99AB8BE4-C585-55A3-B16F-C4B53A9E9E61">
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<li id="GUID-F6B94808-046E-5D80-9BDC-AEEEE1DB694B"><p>Create and initialize
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a <xref href="GUID-8AA6248D-64E4-3C73-8541-03C9880000F0.dita"><apiname>TClientMessageSchema</apiname></xref> structure to represent a single
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message from the client. </p> <p>It defines the function number corresponding
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to the message, the security policy for the message, the number of paramaters
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that are passed to the function and the type and constraint information for
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each of the parameters. </p> <p><codeblock id="GUID-76569264-62A5-53A4-A12F-55067521D309" xml:space="preserve">const TParameterDetails KMessageParams2[1] = {{EParamInt,-10,100}};
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const TClientMessageSchema KClientMessages[] = 
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MESSAGE_SCHEMA( EMessage0, KDefaultPolicy, KMessageParams2 );</codeblock> </p> </li>
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<li id="GUID-2BD81806-096B-58F3-A498-733BBC876809"><p>Create and initialize
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a <xref href="GUID-FF1684A9-62FF-3614-BA8D-084CA2FFC3AE.dita"><apiname>TClientMessageServerData</apiname></xref> structure containing an array
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of custom validation functions<xref href="GUID-DA261437-879F-3A8D-9D91-F683BF41CA32.dita"><apiname>TCustomValidationFn</apiname></xref> and <xref href="GUID-8AA6248D-64E4-3C73-8541-03C9880000F0.dita"><apiname>TClientMessageSchema</apiname></xref> structure
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defining a schema for each message that will be accepted by the server. </p> <p><codeblock id="GUID-1B3F0610-C1D9-5354-959A-B4ABDE746350" xml:space="preserve">extern const TClientMessageServerData aServerData=
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    {
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    sizeof( KClientMessages )/sizeof( TClientMessageSchema ),
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    KClientMessages,                                               
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    KCustomValidationFunctions,
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    ( TUint8* )"My Server"
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    }</codeblock> </p> </li>
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<li id="GUID-A3F4C516-B219-5E77-9F3B-6EB0F76944B4"><p>Initialize the framework
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by calling the static function <xref href="GUID-45AFEB13-9D05-365D-A2A6-A34EF48A494D.dita"><apiname>CClientMessage</apiname></xref>::<xref href="GUID-25CE7350-2288-3E55-901C-0F0AAFECCD1B.dita"><apiname>InitialiseFrameworkL</apiname></xref> ()
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and pass it to <xref href="GUID-FF1684A9-62FF-3614-BA8D-084CA2FFC3AE.dita"><apiname>TClientMessageServerData</apiname></xref> structure. </p> <p><codeblock id="GUID-F2AEF771-F37F-5028-99D7-6DD1CE9209E0" xml:space="preserve">IMPORT_C static void InitialiseFrameworkL( const TClientMessageServerData &amp;aServerData );</codeblock> </p> </li>
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</ol> </section>
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<section><title>Results</title> <p>On construction, <codeph>CMessageParameterBase</codeph> objects
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are instantiated using the <codeph>TParameterDetails</codeph> structs in the
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message schema and stored in an <codeph>RPointerArray</codeph>. The objects
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represent the individual message arguments and are used to validate each argument
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against the constraints defined in the message schema. </p> </section>
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<section><title>Example</title> <p>Below is an example schema that defines
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four messages, including two that define custom validation functions. The
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data is passed to the framework through a constant <codeph>TClientMessageServerData</codeph> structure. </p> <codeblock id="GUID-5375E126-8C70-5B45-9202-E1F94A969E4B" xml:space="preserve">#include &lt;bsul/bsul.h&gt;
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using namespace BSUL;
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//This enum defines the custom parameter types used to validate 
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//TPckg&lt;TMyStruct&gt; and TPckg&lt;TMyStruct1&gt; parameters.
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enum TCustomParamType
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    {        
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    EParamCustom1 = ( 0x000 | EParamPckg ),        
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    EParamCustom2 = ( 0x100 | EParamPckg )     
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    };
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//Defines the schema for each message
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const TParamaterDetails KMessage0Params[2] = {{EParamInt,-10,100},
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                                             {EParamInt,0,200}};
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const TParamaterDetails KMessage1Params[2] = {{EParamDes8Read,64,64},
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                                             {EParamInt,0,64}};
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//Parameter is TPckg&lt;TMyStruct&gt;
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const TParamaterDetails KMessage2Params[1] = {{EParamCustom1,sizeof( TMyStruct ), sizeof( TMyStruct )}};
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//Parameter is TPckg&lt;TMyStruct1&gt;
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const TParamaterDetails KMessage3Params[1] = {{EParamCustom2,sizeof( TMyStruct1 ), sizeof( TMyStruct1 )}};
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//Define the security policies for each message
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_LIT_SECURITY_POLICY_PASS( KDefaultPolicy );
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_LIT_SECURITY_POLICY_C2( KMsg2Policy, ECapabilityReadUserData, ECapabilityWriteUserData );
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//This is the array of TClientMessageSchema structs that define the messages that will be accepted by the server.
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const TClientMessageSchema KClientMessages[] =      
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    {
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    {EMessage0,
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    KDefaultPolicy,         
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    sizeof( KMessage0Params )/sizeof( TParamaterDetails ),KMessage0Params},
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    {EMessage1,
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    KDefaultPolicy,
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    sizeof( KMessage1Params )/sizeof( TParamaterDetails ),KMessage1Params},
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    {EMessage2,
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    KMsg2Policy,
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    sizeof( KMessage2Params )/sizeof( TParamaterDetails ),KMessage2Params},
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    {EMessage3,
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    KDefaultPolicy,
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    sizeof( KMessage3Params )/sizeof( TParamaterDetails ),KMessage3Params}
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    };
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//These are the custom validation functions that are used to validate 
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//TPckg&lt;TMyStruct1&gt; and TPckg&lt;TMyStruct1&gt; parameters
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static void CustomValidationFn1L( CMessageParameterBase* aParameter );
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static void CustomValidationFn2L( CMessageParameterBase* aParameter );
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//This is the array of custom validation functions. The index of the function 
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//in the array should match the upper 16 bits of the value defined in 
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//TCustomParamType enum for that parameter type.
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const TCustomValidationFn KCustomValidationFunctions[] = 
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    {
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    &amp;CustomValidationFn1L,
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    &amp;CustomValidationFn2L
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    };
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//This is the initialization data that is passed into the ClientMessage 
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//framework by the server. It contains everything the framework needs to 
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//validate incoming messages
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extern const TClientMessageServerData KServerData =
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    {
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    sizeof( KClientMessages )/sizeof( TClientMessageSchema ),
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    KClientMessages,                                               
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    KCustomValidationFunctions,
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    ( TUint8* )"My Server"
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    };</codeblock> </section>
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</conbody><related-links>
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<link href="GUID-42C94E3D-93DE-543E-A0D2-8B705C668BE0.dita"><linktext>Base Services
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Utility Library Overview</linktext></link>
1
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</related-links></concept>