Hi all, I've published libffidemo on Github, https://github.com/PierceNg/libffidemo, and DemoFFI on STH, http://smalltalkhub.com/#!/~PierceNg/DemoFFI.
Together, they show how to use Pharo 5's Unified FFI to obtain an "opaque" pointer to a C-level struct, in the two usual styles: passing in a pointer pointer as a parameter, and via a pointer returned by a C function. They also show how to retrieve an integer through the opaque pointer in two usual styles: passing in a pointer to integer as a parameter, which involves creating an integer value holder on the Smalltalk side, and via an integer returned by a C function. Apart from that, the library does nothing. :-) To compile libffidemo for Pharo's use: $ gcc -shared -m32 -o libffidemo.so libffidemo.c I wrote these to figure out how to port NBSQLite3 from NativeBoost to the new FFI. I hope others will find them helpful too. Pierce
