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     7     Nokia Corporation - initial contribution.

     8 Contributors: 

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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-651C2913-2AB9-5873-B296-5C4233967F21-GENID-1-8-1-3-1-1-7-1-5-1" xml:lang="en"><title>CONE

    13 resource loader overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <section id="GUID-57F77D80-D411-48CE-9C2F-2E274027D791-GENID-1-8-1-3-1-1-7-1-5-1-2-1"><title>Purpose</title> <p>The CONE Resource Loader utility is part

    15 of the Symbian CONE component, and it offers methods for opening and closing

    16 resource files. The actual reading of resources from an opened resource file

    17 is done using various <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>CCoeEnv</apiname></xref> provided

    18 resource-reading methods. </p> </section>

    19 <section id="GUID-691C3034-6DBE-4C5A-8F6A-E18C805EA4EE-GENID-1-8-1-3-1-1-7-1-5-1-2-2"><title>Architectural Relationships</title> <p>This utility is implemented

    20 as a single class, <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref>.

    21 Access to the <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>CCoeEnv</apiname></xref> instance

    22 is required in order to use this utility. </p> <p>CONE Resource Loader can

    23 be accessed through the <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref> class

    24 that is defined in the header <codeph>CoeUtils.h</codeph>. The actual component

    25 is linked to the <codeph>cone.dll</codeph> library. </p> </section>

    26 <section id="GUID-5B6C86F8-C914-4329-891A-20088D589EC3-GENID-1-8-1-3-1-1-7-1-5-1-2-3"><title>Description</title> <p><b>Usage</b> </p> <p>CONE Resource

    27 Loader functionality can be accessed via public methods on an <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref> instance. </p> <p>To use, an instance of <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref> is

    28 first created. Then calling either one of the open methods of <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref> opens

    29 the resource file. After the resource file is no longer needed, it must be

    30 closed. </p> <p>A single instance of <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref> can

    31 only have a maximum of one resource file open at any time. If multiple simultaneously

    32 open files are required, instantiate a separate <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref> for

    33 each required file. </p> <p><b>Example</b> </p> <p>The following example shows

    34 how to use the <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref> class: </p> <codeblock id="GUID-8F442DC2-E73B-537A-9A32-9C61280B8FF6-GENID-1-8-1-3-1-1-7-1-5-1-2-3-8" xml:space="preserve">#include &lt;CoeUtils.h&gt;

    35 

    36 // … Other code …

    37 

    38 // Get CCoeEnv instance

    39 CEikonEnv* eikEnv = CEikonEnv::Static();

    40 

    41 // Initialize loader

    42 RCoeResourceLoader rLoader(eikEnv);

    43 

    44 // Open resource file

    45 _LIT( KSampleResourceFileName, "Z:\\System\\Apps\\sample\\sample.rsc" );

    46 TFileName fileName(KSampleResourceFileName);

    47 rLoader.OpenL(fileName);

    48 

    49 // Push resource loader to cleanup stack, so that it will always be properly 

    50 // closed when popped.

    51 CleanupClosePushL(rLoader);

    52 

    53 // Read a resource   

    54 iSomeArray = eikEnv->ReadDesC16ArrayResourceL(R_SOME_RESOURCE);

    55 

    56 // Pop and destroy rLoader from stack. 

    57 // This also calls close on rLoader since CleanupClosePushL was used.

    58 CleanupStack::PopAndDestroy(); // rLoader

    59 </codeblock> <p>For more information on individual methods, please see the

    60 reference API for <xref href="GUID-D2A3BE13-6CD9-3418-AA81-4466B76CF844.dita"><apiname>RCoeResourceLoader</apiname></xref>. </p> </section>

    61 </conbody></concept>