Alex, I haven't done very much of that myself, but have you looked at chapter 21 of JforC? https://www.jsoftware.com/help/jforc/calling_external_programs.htm#_Toc191734429
Cheers, bob > On Oct 5, 2021, at 09:21, Alex Shroyer <[email protected]> wrote: > > How do I send/receive data structures to/from C functions using the cd verb? > > For example if I have this C library saved as /tmp/example.dylib, how do I > call it from J? > > // C code: > struct stuff {double a[2]; int i;}; > void fn(struct stuff *x) {x->a[x->i] += 100;} > > NB. J code: > data =: (2.3 4.5);0 NB. the data I would like to send to fn (array of 2 > doubles; int) > '/tmp/example.dylib fn (declaration)' cd (parameters) > > Specifically, what do I use for the (declaration) and what do I use for > (parameters)? > I presume I should use something from > https://www.jsoftware.com/help/dictionary/dx003.htm but I'm unsure how to > then specify it in the (declaration). > > Is there a relevant example somewhere? > > Thanks, > Alex > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
