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<concept id="GUID-D7600D93-CFB8-565D-8200-7082B2CF1791" xml:lang="en"><title>User

Interface Data MTM</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>UI MTM libraries can be quite large, and often there are functions that

Messaging applications need to access often and rapidly. To improve memory

efficiency, these functions are split off into another DLL, called the UI

Data MTM that can be easily kept in memory without the extra overhead of the

UI MTM. </p>

<section><title>UI Data MTM base class</title> <p>The base class for a UI

Data MTM is <xref href="GUID-899C6D87-5712-34A7-902C-EA452894700C.dita"><apiname>CBaseMtmUiData</apiname></xref>. The implementation of UI Data

MTMs is relatively simple, as they contain little more than functions to return

the required icons and extra menu items. </p> <p>UI Data MTMs offer the following

capabilities: </p> <ul>

<li id="GUID-EF22528E-D4EA-57B4-84FC-BD8E44D742DA"><p> <b>Provide MTM-specific

icons for Message Server entries</b>  </p> <p>Provide bitmap icons for messages,

folders, and services for display in the various folder views. For each icon,

an array of bitmaps should be available, giving the icon in a number of sizes. </p> </li>

<li id="GUID-2830B9E2-B9D1-50AF-B6E9-43D187BE053A"><p> <b>Provide user interface

text</b>  </p> <p>Provide command captions for MTM-specific functions that

the Messaging client application can dynamically add to menus and dialog controls.

A function ID is associated with each caption to identify the MTM-specific

function that should be invoked when the command is chosen. This data is encapsulated

in a resource of the <codeph>MTUD_FUNCTION</codeph> type. </p> </li>

<li id="GUID-24B76538-A4BB-5996-9187-EC03393C35A9"><p> <b>Verification of

MTM functions</b>  </p> <p>Validate the specified functions that are available

on a particular entry, so that a Messaging client application can process. </p> <p>It

is intended that client applications use the <xref href="GUID-F5466277-25C7-31BD-8129-A0FF3D84FC03.dita"><apiname>OperationSupportedL()</apiname></xref> function

to dynamically set the user interface features that are available depending

on the entry currently selected within the application. For example, menu

items that do not apply to particular entries could be greyed out. </p> </li>

</ul> <p>The <xref href="GUID-899C6D87-5712-34A7-902C-EA452894700C.dita"><apiname>CBaseMtmUiData</apiname></xref> class provides the virtual

functions for overriding in derived classes.</p> </section>

</conbody><related-links>

<link href="GUID-59217FA7-3078-53CA-88B3-78D6FB788271.dita"><linktext>MTM     

           overview</linktext></link>

<link href="GUID-BAD138D5-2914-5C6E-9FA4-F7A3CCB85E6D.dita"><linktext>MTM     

           Capabilities</linktext></link>

<link href="GUID-1E2DB50A-D8D7-595D-8448-77F057655E82.dita"><linktext>Writing a

UI Data MTM </linktext></link>

</related-links></concept>