THE MESSAGE SERVER AND MTMS in .NET framework

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THE MESSAGE SERVER AND MTMS
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User Interface MTM User Interface Data MTM
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Client MTM
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Message Server
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Message Type Module (MTM) general structure
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MTMs. All we need to know is that we will use the SMS MTM for some of our tasks. Although we are going to use only the SMS MTM, some applications need to use multiple MTMs and may need to use MTMs that their developers had not foreseen. Therefore the Message Server includes a registry of the available MTMs which can be used to iterate through the loaded MTMs. The MTM registry is responsible for loading MTMs on demand and for unloading them when they are no longer needed. We do not need to use these features. One aspect to be aware of is that it is necessary to use a mixture of generic and speci c APIs. It is hardly surprising that the Message Server does not provide APIs suf cient to manage all types of messages, and the MTMs do not provide full APIs of their own. This makes the learning curve for Messaging programming slightly steeper than might be expected. Another aspect that affects the programmer starting to use the Messaging subsystem is that the Messaging APIs are powerful and sophisticated. They have been designed for functionality rather than ease of use, and they support a range of ways of working. For example, there are many asynchronous methods as well as the synchronous methods we will use. The asynchronous methods are very useful if you are writing a user interface: a synchronous method might leave the user interface unresponsive, so the asynchronous methods support a better user experience. However, the asynchronous methods are slightly more complex to program and we do not need them we will make asynchronous calls from the PC, so we can handle synchronous behavior on the device. There is one part of the Messaging subsystem that is generic and has been designed with ease of use in mind, and that is the Send-As API. This is intended for use by a wide range of applications to send data via a range of MTMs. However, the Send-As API does not cover retrieval of messages or other operations (nor does it fully send the message), so we will not use it.
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INTRODUCING SMS AND MESSAGING CLASSES
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9.2 The Structure of Messages
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Although the Symbian OS Messaging subsystem supports a range of messages, all the messages share some common structures: a header that may include a subject and timestamp and from and to addresses a message body (normally Rich Text) zero or more attached les. Not all types of message can have all these parts. For example, SMS and fax messages cannot have attachments, and MMS messages do not strictly have a body. Even when the parts are supported, they may be optional (for example, attachments are optional for email messages).
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9.2.1 Headers and Bodies
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All messages have some form of header data. This is most obvious for message types such as email and MMS, but even message types such as SMS and fax have information that is logically stored in a header, because it is meta-data as opposed to the actual content of the message. Header data includes: a message subject (actually an SMS message does not have a separate subject as such, but Symbian OS treats the start of the message text as a subject for compatibility with other message types) a from address of some form one or more destination addresses a timestamp. A header may include other data depending on the message type, such as encoding and character set or delivery priority. In addition to the header, most messages have a body, which is stored in a CRichText object. Rich text is suf ciently versatile for most purposes, although it is excessive for an SMS. Exactly how the body text is encoded for sending or decoded when received depends on the message type and is the responsibility of the server-side MTM. For example, a fax message has its body rendered to a graphical form as it is sent. The generic classes TMsvEntry and CMsvEntry expose structures that encapsulate much of the message structure. TMsvEntry contains information common to all message types that can be displayed in a message list in a Messaging Application. CMsvEntry provides access to the body text and message-type-speci c headers and attachments. They
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