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<concept xml:lang="en" id="GUID-A9EA16CE-2F80-5344-827D-0C2ED5812788"><title>File store type and layout</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>File stores can be given a unique identity, known as the file store type, in order to differentiate them from each other.</p> <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> <section><title>See also</title> <p><xref href="GUID-95DF676F-F9BA-56E0-A4DE-E68B42C06932.dita">UID manipulation</xref> </p> </section> </conbody></concept>