From: matthewf@msexchange2k.closedtest.intra
To: matthewf@msexchange2k.closedtest.intra
Subject: test21_2
Date: Sun, 23 May 2004 19:04:55 +0530
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Internet access on the Nokia 9200 Series Communicator is necessarily limited
by the speed of the phone's GSM connection. As a consequence, testing and
debugging Internet-based applications on hardware can be both expensive and
tedious. The RAS IAP application alleviates this problem by enabling you to
connect to the Internet over a much faster serial connection, via your PCThe
application demonstrates how the Symbian OS Communications database (CommDb)
API may be used to configure an Internet Access Point (IAP). To some extent
it also shows the common paradigm for using most DBMS derived APIs.An
Internet Access Point defines ISP, modem, charge card and location records
that can be used together to make an Internet connection. The IAP for the
RAS connection specifies an ISP and modem record (charge card and location
records are required for this type of IAP). The CommDb is a standard DBMS
database. Modems, ISPs, charge cards, locations, IAPs etc are all stored in
their own tables within the database. There may be a number of records
within each table (e.g., there may be a number of IAPs, modems, ISPs, etc.).
As described in the preceding section, each IAP record defines the set of
ISP, modem, charge card, and location that can be used together. In other
words, an IAP record defines a set of records the other tables.The
implication of the above statement is that sets of CommDb records are
accessed through their associated table. The other implication is that you
cannot create an IAP record until you have already created the other
records. Finally, the fact that there may be many records in a table implies
that each record must be uniquely identified.2. Copy an existing CommDb that
has a correctly configured IAP. This method "works", but has several
problems. Firstly, Symbian does not guarantee that the CommDb will be binary
compatible between releases. In practice this has not been an issue, but it
is something to keep in mind. Secondly, while you are using your RAS IAP,
you don't have access to IAPs you configured in the "real" CommDb. Finally,
and most importantly, CommDb configuration should be targeted to the
platform; The CommDb that you use for RAS connections may well disable some
of your other phone services.. Add an IAP to your existing (proven) CommDb
using RAS IAP. The advantage of this method is that you get to retain the
CommDb that your manufacturer put onto the phone, and therefore can expect
the device to continue to work with the new IAP! Also, the CommDb API is
binary compatible between releases, so you can rely on this method as you
change phone. It is also by far the simplest method! Rather than coding the
application from first principles, I used the standard Minimal Eikon
Application Developer (MEAD) and Menu Builder tools to create an application
that I could easily customize. I then modified the engine to write to the
CommDb, and the UI to call the engine as appropriate. Each of these exports
calls non-exported functions to actually implement the creation and deletion
of the components of the IAP. The purpose of each function is documented in
source, and the code itself is fairly self-documenting. Therefore rather
than exhaustively re-describing the code, the following description
discusses the main paradigms that you will see.First of all, there are two
sequence diagrams present. The first one captures the course of events that
takesplace when a digit button is pressed. The second captures what happens
when the user pushes the 'send'button in order to make a call. At the top of
each diagram we see the rectangles that represent objects. Asin
collaboration diagrams, the names of the objects are underlined to
distinguish them from classes. Alsothe object name is separated from the
class name by a colon. Some objects, like the Dialer, have noparticular
object name, so the colon precedes the class name without an object name in
front of it.objects that they are connected to are in existence. In Figure
2, we cannot see the full extent of thelifelines; they extend from the very
top of the diagram to the very bottom. This implies that the
objectsportrayed in this diagram are in existence before the start of time
in the diagram and remain in existencebeyond the end of the diagram.The
arrows between the lifelines represent messages being sent between the
objects. Sequence umbers, algorithm.Here again we see two sequence diagrams.
In these diagrams the activation ectangles have been omittedfor clarity4.
The top diagram shows the normal course of events hen the cellular phone
receives a call.The CellularRadio object detects the incoming call and
sounds the ringer. It also tells the Dialler objectthat a call is coming in.
This puts the Dialler in a special state. When the Send button is pushed
while theDialler is in this special state, the Dialler sends the Answer
message to the CellularRadio; thus connectingthe call.

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