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PDT 3200 Technical Reference Guide
Recommended Programming Practices
The programming methodologies used to develop DOS applications for a desktop PC also
apply to creating applications for the PDT 3200. Some of these are more critical to success
on a PDT 3200 than on a PC, because of the hardware environment of the PDT 3200. The
following are some important guidelines for programming PDT 3200 applications:
¥ Always check for reported error conditions. Many of the BIOS and DOS service
routines are useful only if the calling application checks for any ßagged error
conditions that signal a failure to comply with the original request. For example,
not enough available memory or lack of disk storage space must be dealt with
immediately; otherwise data may be lost.
¥ Carefully choose how data will be stored. A PDT 3200 unit has a number of data-
storage options: RAM drive, ßash drive, ATA ßash PC card, remote storage via
RF, and other PC card possibilities. You should be aware of the strengths and
limitations of each storage method and plan to store critical and temporary data
in appropriate locations so as to maximize both system performance and data
security.
¥ Disable the CTRL-ALT-DEL key combination. The PDT 3200 allows for easy
rebooting during the development process. To prevent the end user from
resetting the unit in the Þeld, disable the CTRL-ALT-DEL key combination. You
can accomplish this by using bar code programming (see the PDT 3200 Product
Reference Guide) or by calling an API function (see the DeveloperÕs Toolkit).
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