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<!DOCTYPE task
  PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">
<task id="GUID-31C19816-ED66-4E99-BF7C-33602C8B4AA2" xml:lang="en"><title>Define
and create a service</title><prolog><metadata><keywords/></metadata></prolog><taskbody>
<context>       <p>The first step in creating a new service is to define what
the service is its use. Services must be implemented over the server application
framework when there is a need for a client and UI service implementation
to be implemented in separate processes. For instance, this may be done to
avoid capability clashes between components.   When a new service type is
identified, a new UID must be assigned to identify it. </p><p><b>Define the
APIs</b></p><p>The client and server-side APIs must be implemented through
an IPC protocol. Therefore, usage of complex objects which are difficult to
represent over IPC must be avoided.</p><p>The following example shows the
UID and IPC message IDs for a chat service.</p><codeblock xml:space="preserve">const TUid KInterAppChatType = { 0x01010202 };
enum
    {topic
    EInterAppChatSend = RApaAppServiceBase::KServiceCmdBase,
    EInterAppChatReceive,    EInterAppChatCancelReceive
    };</codeblock></context>
</taskbody></task>