Worth Data 802 RF Spécifications télécharger pdf (Page 41)

6-4

promptline2 as string

promptline3 as string

NextIfError as integer

NextIfOK as integer

End Type

dim TransactionSequence(10) as TransactionElement

TransactionSequence(1).commandcode = 1 'InputAny

TransactionSequence(1).promptline1 = "Go to Location " +

GetLocationCode

TransactionSequence(1).promptline2 = "Press Enter When

Ready "

TransactionSequence(1).NextIfError = 1

TransactionSequence(1).NextIfOK = 2

Etc.

As mentioned above, it is important to keep your event handlers short and

efficient. This means that your program should spend as little time as

possible "inside" the event handler (running the handler's code). Also, it is

important to NOT call WD802Term methods from inside WD802Term

event handlers. So a solution is needed that allows your program to respond

to events outside of the event handlers.

An easy way to do this is with a polling scheme. Add a timer object to your

application and in the timer's event handler check the

TermData structure

for the state of each terminal and make any appropriate WD802Term

method calls from within the timer object's event handler. The timer can be

set to fire every 100 milliseconds or every 10 seconds or anything in

between that is appropriate for your application.

Another, more advanced way to decouple the WD802Term method calls

from the event handlers is using threading techniques where each terminal

is "running" in a thread that monitors that terminal's state.

WD802Term/ActiveX

WD802Term is a drop in ActiveX component that allows programmers to

easily add the ability to send prompts to and receive data from their R/F

Terminal across a wireless 802.11b Ethernet network connection.

The ActiveX component is compatible with Visual Basic, Visual C++,

Delphi, and most other 32-bit development platforms.

Programming Considerations

Remember, plan for every error that the Server might return including:

Sequence Errors detected

Illegal Command detected

Addressing a Terminal Not Signed In

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Worth Data 802 RF Spécifications Page 41