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<!DOCTYPE task

  PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">

<task id="GUID-7F4692A0-1801-5D91-8F28-06075AC45DE2" xml:lang="en"><title>Filtering

Implementations by Vendor ID </title><shortdesc>The Plug-in framework clients can be restricted to use plug-ins

supplied by a particular company. This enables to enhance security and improve

functionality of the framework. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>

<context><p>Platform security provides a mechanism to mark the plug-ins with

a vendor identifier by using the <codeph>vendorid</codeph> keyword in the <xref href="GUID-641A276D-F618-50CE-BA5A-658DCC26BAB5.dita">project file</xref>. This

information is used for plug-in selection. </p><p>To filter implementations

by vendor id there is no need to use the <codeph>TEComResolverParams</codeph> object.

Instead, follow the steps described below: </p> </context>

<steps id="GUID-C7923C51-397D-5E3B-B47C-F19AD21743FF">

<step id="GUID-7E2CAE34-C937-50E7-BA83-44CB02E95A1A"><cmd/>

<info>Retrieve the list of available implementations of an interface using <xref href="GUID-1344F049-81C4-3D17-AF46-8B5584680ADB.dita#GUID-1344F049-81C4-3D17-AF46-8B5584680ADB/GUID-AE9D4F24-8554-3151-AAF3-D63F400821C4"><apiname>REComSession::ListImplementationsL()</apiname></xref>. </info>

</step>

<step id="GUID-82D683A5-7BE6-5E4D-9686-30869F71E617"><cmd/>

<info>Retrieve the vendor ID of the implementation, using <xref href="GUID-3107B19B-0607-3E9E-AEA5-BAD07EEC59D0.dita#GUID-3107B19B-0607-3E9E-AEA5-BAD07EEC59D0/GUID-372E7F18-EAA3-3B85-950D-72E3C09072C8"><apiname>      

          CImplementationInformation::VendorId()</apiname></xref>. </info>

<info>If the matching vendor ID is returned, use the plug-in as required. </info>

</step>

</steps>

<example id="GUID-F6140DF5-515F-5C42-B905-E8BC64380410"><title>Filtering implementations

by vendor ID example</title> <codeblock id="GUID-21D942BD-CDC5-5976-A760-2607A1D88F7F" xml:space="preserve">// Specify interface for which to get implementations

TUid interfaceUid={0111111111};

RImplInfoPtrArray implArray;

// get list of implementations into the array

REComSession::ListImplementationsL(interfaceUid, implArray);

// loop through implementations

TInt implCount = implArray.Count();

for(TInt count = 0; count < implCount; count++)

  {

  // read vendor ID

  const CImplementationInformation* implInfo = implArray[count];

  TVendorId vid = implInfo->VendorId();

   . . .

  }

   . . .

implArray.ResetAndDestroy();

REComSession::FinalClose();</codeblock> </example>