An ordinary VB developer shares his own successes and failures
Use 'Select Case' selectively - Addendum
Here is the source code and a few notes accompanying the original article.
The real software discussed in the article uses a voting engine embedded within the
Philips' Central Control Unit (CCU), which is wrapped by the Voting class.
Because you probably don't have a CCU at your disposal, the first thing would
be to emulate the original voting engine's functionality.
The Voting class does its job by employing a simplified state design
pattern (once again
)
and a simplified version of the original
Voting class' interface, excluding things like voting timers,
voting round numbering, delegate database and voting
results handling...all the stuff not directly related
to the domain of state machines.
The user interface code consists of two forms – the
FVotingOld form
and the FVotingNew form.
The FVotingOld form uses the
classic Select Case approach for handling the various
voting states.
The FVotingNew form uses the 'state' approach
discussed in the original article.
Both forms use the Voting class, whose instance is
passed to the forms' constructors.
I encourage you to experiment a bit with the project and step through the 'old' and 'new' code to grasp the differences.
Enjoy!
(c) Palo Mraz, Sunday, August 31, 2003
