Hi, could be the problem that you are using the same external array for both xm and ym?. The clone message just creates a shallow copy of the external array. It does not allocates a new external array, it only copies the address in both xm and ym.
You should better do something like this: xm := FFIExternalArray externalNewType: 'float' size: 2. ym := FFIExternalArray externalNewType: 'float' size: 2. Cheers. On Mon, Nov 26, 2018 at 9:30 AM Yuriy Babah <babah.yuri...@gmail.com> wrote: > Hi ! > > I'm trying to call a very simple function from C ++ lib, writed for the > test. > function with prototype: > > extern "C" float interpolationFunc(float* xm, float* ym, int size, float > x). > > In Pharo7 wrote: > FFIExamples class >> interpolationFunc_xm: xM ym: yM size: size x: x > ^ self ffiCall: #(float interpolationFunc #(float * xM , float * yM , > int size , float x)) module: 'libinterpolationLib.so' > > in Playground i'm doing: > xm := FFIExternalArray externalNewType: 'float' size: 2. > ym := xm clone. > #(2 3) doWithIndex: [:each :i | xm at: i put: each]. > #(3 4) doWithIndex: [:each :i | ym at: i put: each]. > FFIExamples interpolationFunc_xm: xm pointer ym: ym pointer size: 2 x: > 2.5 . > > last expression returninп me 0.0, but right is 3.5. > > I'm dit the same in Python3 ctypes, and there work's fine. > > In UnifiedFFI booklet is absent chapter "Arrays", anybody may help with > whot i'm doing wrong? > -- Pablo Tesone. teso...@gmail.com
