Hi, first post and just new to Lua also :))
I am trying to run this FFI libcall (linux).
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ffi.cdef[[
int TA_RSI( int startIdx,
int endIdx,
const double inReal[],
int optInTimePeriod,
int *outBegIdx,
int *outNBElement,
double outReal[] );
]]
----------------------------------------------------------------------------
-- Passing Parameters
----------------------------------------------------------------------------
optInTimePeriod = 1
startIdx = 0
endIdx = 8
maType =
1
outBegIdx = ffi.new("int[1]",0) --Pointer set val to zero, therefore ffi.new ?
outNbElement = ffi.new("int[1]",0)
----------------------------------------------------------------------------
-- The in/out Array
----------------------------------------------------------------------------
inA = {[0] = 1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0} -- zerobased array the lib is expecting
outA = {[0] = 0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0}
----------------------------------------------------------------------------
-- Table to Array Constructor
----------------------------------------------------------------------------
inReal = ffi.new("double[9]", inA )
outReal = ffi.new("double[9]", outA ) -- or this? -> outReal = ffi.new("double[9]", {})
----------------------------------------------------------------------------
--The Libcall
----------------------------------------------------------------------------
retVal = ta_lib.TA_RSI(startIdx, endIdx, inReal, optInTimePeriod, outBegIdx, outNbElement, outReal)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The lib is expecting two prefilled arrays, doing some math with the inReal[] and filling the outReal[]
with the results (double). running this script returning a errorcode 2 (bad params).
I was trying a simpler call too without any error but don't know how to access the
the outReal[] array.
via type? I am getting a cdata(double[9]) var. how to convert this cdata to a lua-table?
Looked at the docu but can't make it working since I am just start working with Lua.
Any advise or hint where I can crawl further?
best, peter
