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Has anyone on the list used Quality Trading Innovation's Hashnums32 or
QlsNumbs32 DLL's to interface a Visual Basic program with Tradestation
2000i. If so, does the VB, DLL, TS 2000i combination work well? Is it
stable and reliable?
I would also like to know how the 3 programs work together? For example, I
know the DLL uses a client-server configuration and TS or any other 32 Bit
program can call DLL function's in order to pass data back and forth (I have
HashNumbs), but how would you pass data in the following manner:
TS -> DLL -> VB -> DLL -> TS
One way I can think of doing this might be to have the VB program polling
some kind of flag variable. The sequence might go something like this: the
TS system fires at the end of the bar, it passes it's data to the DLL, sets
a "flag" variable to True. The VB program, which is constantly polling the
flag variable, would fire when it's value is True. Of course this would
have to work in reverse also with TS similary polling another flag variable
in order to control the execution of the rest of it's system code. However,
this seems rather convoluted and wasteful of processor cycles.
Another way might be to somehow execute the VB program from within TS.
However, I am only a beginner VB programmer which brings me to my final
request: perhaps somebody on this list might have a reference for a good
book/magazine/article/web site that explains VB DLL's, how they work and how
to write them etc.?
I would turn to the creator of these DLL's but he states the following in
his product literature so I'm turning to any generous souls on this list
with the requisite knowledge for help:
Please refer to the appropriate language documentation
for using DLL's. I cannot provide any support for
doing this (writing programs in C/C++ or Visual Basic that
use the DLL to communicate with Tradestation). Using DLL's
in this manner requires a certain level of programming
experience and the wrong usage may detrimentally affect
your system.
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