April 2002
Intermediate to advanced
440 pages
12h 37m
English
Content preview from Programming Visual Basic for the Palm OSBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Conduit Design
There are several major design principles for a conduit. The first, and most important, is that the conduit runs as quickly as possible. No one wants to wait while synchronization grinds on and on. Honoring the fast and slow sync flags will help you to optimize performance. A fast conduit also minimizes the use of the Palm device’s serial port. This is important, because serial port use can drain the PDA’s batteries very quickly.
The second principle is that a conduit must always move application data in a natural way between the Palm device and the desktop. Your user relies completely on this behavior. She also relies on the conduit to restore all data in case of a disaster. If your conduit is not correctly implemented, or has bugs, user acceptance of your application will suffer greatly.
A third principle is that your conduit must be able to run without attention from the user. While this is a good design principle for software in general, it is especially important for a conduit. This is because the user might be synchronizing from a remote location, communicating with the HotSync manager over a modem or network connection. The user will not be able to respond to any prompts or dialog boxes that a conduit might display on the desktop. This will cause the entire HotSync session to hang.
Palm provides some more design guidelines in the C/C++ Conduit Companion; you should certainly study those before implementing your own conduit.
If you are building a mirror-image ...
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