commonuisupport/uifwsdocs/BR1898_migration_note.htm
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 27 Apr 2010 16:55:05 +0300
branchRCL_3
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permissions -rw-r--r--
Revision: 201015 Kit: 201017
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<html>
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<head>
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<meta http-equiv=Content-Type content="text/html; charset=windows-1252">
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<meta name=Generator content="Microsoft Word 10 (filtered)">
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<title>Licensees need to update any overrides of CEikAppUi::HandleSystemEventL
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on the same pattern as Symbian will do</title>
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<style>
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<!--
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 /* Font Definitions */
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 @font-face
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	{font-family:Courier;
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	panose-1:2 7 4 9 2 2 5 2 4 4;}
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 /* Style Definitions */
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 p.MsoNormal, li.MsoNormal, div.MsoNormal
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	{margin:0cm;
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	margin-bottom:.0001pt;
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	font-size:12.0pt;
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	font-family:"Times New Roman";}
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a:link, span.MsoHyperlink
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	{color:blue;
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	text-decoration:underline;}
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a:visited, span.MsoHyperlinkFollowed
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	{color:purple;
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	text-decoration:underline;}
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pre
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	{margin:0cm;
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	margin-bottom:.0001pt;
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	font-size:10.0pt;
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	font-family:"Courier New";}
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@page Section1
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	{size:612.0pt 792.0pt;
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	margin:72.0pt 72.0pt 72.0pt 90.0pt;}
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div.Section1
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	{page:Section1;}
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-->
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</style>
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</head>
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<body lang=EN-GB link=blue vlink=purple>
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<div class=Section1>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='color:black'>UI Framework provides a function </span><span
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style='font-size:10.0pt;font-family:"Courier New"'><a
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href="http://lon-xref.intra/lxr/ident?i=CEikonEnv"><span style='color:windowtext'>CEikonEnv</span></a>::<a
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href="http://lon-xref.intra/lxr/ident?i=SetSystem"><span style='color:windowtext'>SetSystem</span></a></span>
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to be used by applications that should not be possible to close from another
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application. Currently this mechanism does not work and changes to Symbian code
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alone will not be enough to close this vulnerability. </p>
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<pre><span style='font-size:12.0pt;font-family:"Times New Roman"'>&nbsp;</span></pre><pre><span
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style='font-size:12.0pt;font-family:"Times New Roman"'>Updates to licensee code are required to prevent that applications having called </span><a
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href="http://lon-xref.intra/lxr/ident?i=CEikonEnv"><span style='color:windowtext'>CEikonEnv</span></a>::<a
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href="http://lon-xref.intra/lxr/ident?i=SetSystem"><span style='color:windowtext'>SetSystem</span></a><span
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style='font-size:12.0pt;font-family:"Times New Roman"'> (e.g. Telephony) to be possible to close from another application. </span></pre>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='color:black'>&nbsp;</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='color:black'>To close the security vulnerability all implementations of
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the virtual </span><span style='font-size:10.0pt;font-family:"Courier New";
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color:black'>CCoeAppUi::HandleSystemEventL</span><span style='color:black'> needs
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to:</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-family:Symbol;color:black'>·          </span><span
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style='color:black'>Change so that an application marked as “system” does not
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close itself when it receives an </span><span style='font-size:10.0pt;
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font-family:"Courier New";color:black'>EApaSystemEventShutdown</span><span
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style='color:black'> event</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-family:Symbol;color:black'>·          </span><span
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style='color:black'>Add functionality so that an application is closed when it
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receives an</span><span style='font-size:10.0pt;font-family:Courier;color:black'>
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</span><span style='font-size:10.0pt;font-family:"Courier New";color:black'>EApaSystemEventSecureShutdown</span><span
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style='font-size:10.0pt;font-family:Courier;color:black'> </span><span
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style='color:black'>event</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='color:black'>&nbsp;</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='color:black'>In code this can be expressed like this.</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='color:black'>&nbsp;</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:black'>EXPORT_C void CXxxAppUi::HandleSystemEventL(const
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TWsEvent&amp; aEvent)</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:black'>      {</span></p>
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<p class=MsoNormal style='text-indent:36.0pt;line-height:12.0pt;text-autospace:
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none'><i><span style='font-size:10.0pt;font-family:Courier;color:black'>&lt;skip&gt;</span></i></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:black'>          case EApaSystemEventShutdown:</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+</span><span
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style='font-size:10.0pt;font-family:Courier;color:black'>           </span><span
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style='font-size:10.0pt;font-family:Courier;color:green'>      // This event
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must no longer be allowed to close system-applications</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+              if((static_cast&lt;CEikonEnv*&gt;(iCoeEnv)-&gt;IsSystem()))</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+                      break;</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+</span><span
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style='font-size:10.0pt;font-family:Courier;color:black'>       </span><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>case EApaSystemEventSecureShutdown:</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+</span><span
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style='font-size:10.0pt;font-family:Courier;color:green'>              // If
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shutter is already running we don’t need to launch another one</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+              if(iAppUiExtra
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&amp;&amp; iAppUiExtra-&gt;IsSet(CEikAppUiExtra::EShutterPending))</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+                      break;</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+              </span><span
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style='font-size:10.0pt;font-family:Courier;color:green'>// Launch a shutter to
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gracefully close the application</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:black'>               CEikShutter::DeferredExecuteL(*iEikonEnv);</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+              if(iAppUiExtra)</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:blue'>+                      iAppUiExtra-&gt;Set(CEikAppUiExtra::EShutterPending);</span></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:black'>            break;</span></p>
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<p class=MsoNormal style='text-indent:36.0pt;line-height:12.0pt;text-autospace:
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none'><i><span style='font-size:10.0pt;font-family:Courier;color:black'>&lt;skip&gt;</span></i></p>
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<p class=MsoNormal style='line-height:12.0pt;text-autospace:none'><span
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style='font-size:10.0pt;font-family:Courier;color:black'>      }</span></p>
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<p class=MsoNormal>&nbsp;</p>
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</div>
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</body>
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