Symbian3/PDK/Source/GUID-579D7C32-B6C8-5C77-88A5-B3078729E1BA.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Wed, 16 Jun 2010 10:24:13 +0100
changeset 10 d4524d6a4472
parent 5 f345bda72bc4
child 14 578be2adaf3e
permissions -rw-r--r--
removal of PIPS 'antiword' example pending a decision on its license
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
5
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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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. -->
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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<!-- This component and the accompanying materials are made available under the terms of the License 
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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"Eclipse Public License v1.0" which accompanies this distribution, 
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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<!-- Initial Contributors:
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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    Nokia Corporation - initial contribution.
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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Contributors: 
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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-->
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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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-579D7C32-B6C8-5C77-88A5-B3078729E1BA" xml:lang="en"><title>How
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to implement a simple client interface</title><shortdesc>Provides code snippets to help you to implement a simple client
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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interface.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-EE1BFD0F-EE55-47BA-A8FD-D753EC132255"><title>Client side session with a server</title> <p>A client side
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session is represented by an instance of a class derived from <codeph>RSessionBase</codeph> which
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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provides the behaviour for connecting to the server and sending messages to
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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it. </p> <p>In the following code fragment, taken from the example that can
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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be found at <filepath>...\examples\Base\IPC\ClientServer\simple</filepath>,
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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the class <codeph>RCountServSession</codeph>, derived from <codeph>RSessionBase</codeph>,
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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represents the client side session with a server. In the example, this may
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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be referred to as the "count server". Note that sessions can not be shared
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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in this example, and it just shows the basic mechanics of the client/server
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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interaction. </p> <codeblock id="GUID-48AC1BF2-BA67-5959-A49A-AF57AC25E155" xml:space="preserve">class RCountServSession : public RSessionBase
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    {
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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public:
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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    RCountServSession();
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    TInt Connect();
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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    TVersion Version() const;
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    TInt UnsupportedRequest();
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    TInt SetFromString(const TDesC&amp; aString);
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    void Increase();
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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    void Decrease();
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    void IncreaseBy(TInt anInt);
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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    void DecreaseBy(TInt anInt);
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    void Reset();
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    TInt CounterValue();
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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    void BadRequest();
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    void Close();
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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private:
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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    RThread iServerThread;
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    };</codeblock> <p>The important points are: </p> <ul>
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<li id="GUID-B6AC51AC-91A3-5794-815A-292E308735F6"><p>Use <codeph>Connect()</codeph> to
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start the count server. This calls <codeph>RSessionBase::CreateSession()</codeph> to
f345bda72bc4 Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
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create a session with the server. Note that in this simple example, the server
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is implemented as a separate thread, which is started by the example executable. </p> </li>
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<li id="GUID-EBDC7F23-8D2F-5093-8C32-50C3DE137EF5"><p>Use a client interface
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function, such as <codeph>Increase()</codeph>, to send a specific message
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to the server. The client interface function builds the message using the
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appropriate operation code and assembling a suitable <xref href="GUID-4AD02F14-1142-372F-9D11-224595932034.dita"><apiname>TIpcArgs</apiname></xref> object,
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i.e. the object containing the integers and/or the descriptor pointers to
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the message arguments in the client address space. </p> </li>
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</ul> <p>As an example, the function <codeph>SetFromString()</codeph> is implemented
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as follows: </p> <codeblock id="GUID-A673A2A4-0999-5EDE-9FFB-E0C7335B58D9" xml:space="preserve">TInt RCountServSession::SetFromString(const TDesC&amp; aString)
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    {
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    TIpcArgs args(&amp;aString);
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    return SendReceive(ECountServSetFromString, args);
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    }</codeblock> <p> <codeph>SendReceive()</codeph> is called, specifying
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an operation code <codeph>ECountServSetFromString</codeph> and a <xref href="GUID-4AD02F14-1142-372F-9D11-224595932034.dita"><apiname>TIpcArgs</apiname></xref> object
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containing argument values. In this case, there is only one argument - a pointer
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to a <codeph>TDesC</codeph> object containing the string to be passed to the
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server. Typically, operation codes are enum values defined in a header file
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visible to both the client interface and the server. Note that the client
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descriptor must remain in existence until the server request completes. </p> </section>
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</conbody></concept>