LabVIEW
CIN - Dynamic parameter
@drikske wrote:
Hi,
Is there a way to retrieve the data type of your
I’m trying to make a single abstract block that supports the most common data types. (so I want to know the data type during CINinit)
Kind regard,
No, this wouldn't work. The only function which does have some information about the datatypes is the CINRun function and that only internally without a possibility for you to access that information. Also even if you could access this information it would be a real hassle to make sure you treat the stack properly depending on your parameters you passed in, something which you might need to deal in assembler with to make it always work right.
If the Variant datatype and the necessary LabVIEW manager fucntions to deal with it would have been documented you could use a variant here, but alas this information was not considered to be added to the External Code Reference Manual and therefore stays undocumented up to now.
Another way is to abandone the CIN altogether and go with shared libraries. But be aware that self adapting code depending on the variable types gets rather complicated soon. If you want to see an example of how this could be solved and how the according C code would look like you can check out LabPython. It does not support all LabVIEW types but a reasonable number of them and it does get already quite complicated. The entire VI library, test VIs and the c source code is available in the CVS repository on sourceforge.
Rolf Kalbermatter
Message Edited by rolfk on 12-21-2005 11:01 AM
Message Edited by rolfk on 12-21-2005 11:01 AM
