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<concept id="GUID-A9EA16CE-2F80-5344-827D-0C2ED5812788" xml:lang="en"><title>File

Store Type and Layout</title><shortdesc>File stores can be given a unique identity, known as the file store

type, in order to differentiate them from each other.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The file store type is defined as a <codeph>TUidType</codeph> which can

be constructed from one, two or three UIDs, i.e. <codeph>TUid</codeph> components.</p>

<p>The first UID component identifies the layout of the file store; i.e. it

identifies the file store as either a direct file store or a permanent file

store. The second and/or the third UID components are application dependent.</p>

<p>After creating a new file store, an application must set the type of the

file store using the file store's <codeph>SetTypeL()</codeph> member function.</p>

<p>As a minimum requirement, the first UID component of the <codeph>TUidType</codeph>,

which identifies the layout of the file store, must be specified. This component

takes one of the values:</p>

<ul>

<li id="GUID-0BFB4EDE-6C99-586F-BEE4-2F85BF338512"><p><codeph>KPermanentFileStoreLayout</codeph> to

identify a permanent file store.</p> </li>

<li id="GUID-32FD6BB3-1D1B-5CC4-BC3C-903655E08E86"><p><codeph>KDirectFileStoreLayout</codeph> to

identify a direct file store.</p> </li>

</ul>

<p>The following code fragment is typical:</p>

<codeblock id="GUID-DA3A8804-C597-522E-8AB4-2D971F3085CB" xml:space="preserve">...

CFileStore* store = CDirectFileStore::ReplaceLC(...,...,...);

store->SetTypeL(KDirectFileStoreLayoutUid);

...</codeblock>

<p>If an application needs to explicitly set the second or the third UID component,

then the <codeph>TUidType</codeph> object must be constructed explicitly and

passed to <codeph>SetTypeL()</codeph>; for example:</p>

<codeblock id="GUID-0389703A-8AAD-5716-863C-9121B26097DE" xml:space="preserve"> ...

 CFileStore* store = CDirectFileStore::ReplaceLC(...,...,...);

 TUidType thetype(KDirectFileStoreLayoutUid,...,...);

 store->SetTypeL(thetype);

 ...</codeblock>

<p>The file store's type can be retrieved by calling the file store’s <codeph>Type(</codeph>)

member function.</p>

<p>The file store's layout can be retrieved by calling the file store’s <codeph>Layout()</codeph> member

function.</p>

</conbody><related-links>

<link href="GUID-95DF676F-F9BA-56E0-A4DE-E68B42C06932.dita"><linktext>UID manipulation</linktext>

</link>