Indices and Navigating in .NET framework

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9.2.4 Indices and Navigating
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Although message data is heavily dependent on the type of the message, navigation around the Message Store is a generic requirement and so the TMsvEntry and CMsvEntry classes provide generic ways of navigating around the message store. A TMsvEntry object contains some standard pieces of information about a message, but it also contains the index identi er for the entry. Many of the MTM methods apply to a current context, that is, a currently selected message entry that corresponds to a TMsvEntry object and a CMsvEntry object, and obviously all non-static TMsvEntry and CMsvEntry methods apply to speci c message entries. Not all entries in the Message Store are messages. Message folders, such as the Inbox, Outbox, Drafts folder and Sent Messages folder, are also entries, as are attachments. In these cases they are entries that have child entries (the messages themselves). Message services are also entries, but we do not need to examine them in this chapter. Some entries have other entries as children (folder entries have message entries as children, and message entries may have attachments as children), and the Message Store can be navigated either as a tree of entries or directly to a desired entry. The index identi er in each TMsvEntry object is a unique identi er that identi es each entry. There are some standard identi ers that are de ned by constants. These are de ned in msvids.h and include: KMsvNullIndexEntryId for a null, unused, entry
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MESSAGE SERVER EVENTS AND SESSIONS
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KMsvGlobalInBoxIndexEntryId for the Inbox folder KMsvGlobalOutBoxIndexEntryId for the Outbox folder KMsvDraftEntryId for the Drafts folder KMsvSentEntryId for the Sent Messages folder. Given these folder index values, it is possible to access all their child entries and so access all the messages in a selected folder. It is also possible to receive an entry identi er in isolation, for example as part of an event, and then navigate to the entry by means of CMsvEntry or MTM methods. Given a CMsvEntry object with children, the CMsvEntry::Count() method provides the number of children, while the CMsvEntry::[] operator, CMsvEntry::Children(), CMsvEntry::ChildrenWithMtmL(), CMsvEntry::ChildrenwithTypeL(), and CMsvEntry::ChildDataL() or CMsvEntry::ChildEntryL() methods provide access to the children or a selection of them. The CMsvEntry::SetEntryL() method allows navigation directly to an entry given its index identi er (for example, if the index identi er has been provided as part of an event). Similarly, the CMsvSession::GetEntry() and CMsvSession::GetEntryL() methods allow access to a TMsvEntry or CMsvEntry object given an index identi er. New message entries can be created as children of the currently selected entry by means of the CMsvEntry::CreateL() method or MTM-speci c methods. Deletion of message entries has to be carried out by means of the parent using the CMsvEntry::DeleteL() method.
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9.3 Message Server Events and Sessions
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The Message Server makes extensive use of asynchronous methods and is also designed to receive asynchronous external events, such as receiving some types of message. The most common types of messaging application require to be informed of these events. For example, the Messaging Application requires its display to be kept up-to-date when messages come in or are sent. It would be possible for messaging clients to keep up to date by polling the Message Server on a regular basis, but this would be inef cient and would not guarantee a prompt response. Instead, the Message Server uses an observer pattern, whereby a client implements a class that implements an MMsvSessionObserver mixin and registers with the Message Server. Then, whenever an event occurs, the Message Server informs all registered observers. This is a common pattern within Symbian OS, and other servers use observers.
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Like any other Symbian OS server, the Message Server is accessed by clients by means of a session, using the CMsvSession class. An object of this class is then passed to any other messaging method that requires access to the Message Server. In fact, because the MMsvSessionObserver events include error events that all messaging clients need to know about, it is necessary to create an observer in order to get a CMsvSession object.
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