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Am 09.08.2007 um 18:06 schrieb Wojtek Skulski:
> On Wed, 8 Aug 2007, Rainer Neubauer wrote:
>> Does this mean you call the NI DLL's directly, i.e. writing an
>> interface module and calling the DLL procedures from BlackBox, so
>> "bypassing" the LabView language (which would imply a proper
>> documentation of the DLLs) ?
>
> Yes, exactly. I can release my interface modules to the community,
> provided I do not have to write documentation ;-)
>
This sounds interesting. It would be nice if you could give me a hint
where
to find the documentation of a certain DLL (e.g. for the PXI-4351) at
NI.
> Please let me know if you are interested. I can send the following
> subsystems "as is" to whoever wants to have a look, but please do it
> at your own risk.
It would be great if you could mail the interface module for this DLL
and the
subsystem for the PXI-4351 (to rainer.neubauer{([at]})nowhere.xy
have
a look how you did it and by the way learn a lot.
I'm currently trying a similar approach but I take a long way round:
instead of writing an interface module directly for a NI DLL I take the
LabView-VI's (= subroutines) sitting on top of the DLL, try them out
to see how it works
and then tell LabView to build a DLL of these VI's. Then I write an
interface module
for this DLL and call the code from CP.
Advantages:
- playing around with the VI's at a very low level to see how it
works before I write interface modules
- if something does not work (or better: if I do not understand how
it works)
I have the extensive LabView help available or may ask anybody being
familiar in the world of LabView without talking about CP and (more
important)
about lowest level details of the C language
- I may decorate these VI's with some small code around their input
or output
values directly in LabView to get rid of unnecessary low level
details as soon
as possible. This code will go into the DLL too.
Example: There are often VI's taking input parameters of types 8 bit
unsigned or
16 bit unsigned. For me this seems to make not so much sense; I guess
these types are
just what the C code in their DLL expects to get. So I put LabView
type conversions right
in front of these inputs to be able to supply all integer inputs with
32bit signed integer values
which corresponds to CP INTEGER type.
Best regards,
Rainer
--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy
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Received on Sat Aug 11 2007 - 14:27:19 UTC