Return array size from XP array datarefs

[JT8D-17]

I'm trying to return the array size of a dataref by using the method documented in the SDK:

Read a part of a single precision floating point array dataref. If you pass NULL for outVaules, the routine will return the size of the array, ignoring inOffset and inMax.

So in theory

XPLMGetDatavf("sim/aircraft/overflow/acf_tank_X", NULL,0,2)

should return the size of the array (10 for the example dataref)

But instead, I get "Wrong arguments to function XPLMGetDatavf" as a console output.

The only accepted format of a XPLMGetDatavf call in FWL is

XPLMGetDatavf(inDataRef, inOffset, inMax)

with everything else producing the aforementioned "wrong arguments" error.

My use case is trying to get the size of an array dataref in XP so that I can iterate through it.

It would be nice to have this functionality implemented.

FWL version: Plugin Version: 2.7.26 build Jun 27 2020 22:48:04
XP version: 11.50b13
Linux

[zodiac1214]

@JT8D-17 did you ever find a solution? I am facing the same issue and because dataref is yet provided, I have no way to know the length

[JT8D-17]

No. I worked around this by writing my own accessor in Lua's foreign function interface to directly interface with the SDK library.