Awesome, thanks! I actually just implemented it with the roundabout callback system, i think i might try out your suggestion though.
Thanks for working on racket! Nate On Mon, Jul 13, 2020 at 12:20 PM Matthew Flatt <[email protected]> wrote: > I see that there's not a good way right now, but here's a workaround > that uses information about the current layout: > > A cpointer value is implemented as a Chez Scheme record with either 1 > field or 2 fields. There are 2 fields only when the cpointer has an > offset as a result of `ptr-add`, so you can probably ignore that. > > To extract the first field, assume that a record has the same layout as > a vector, so use `Svector_ref(p, 0)` to extra the field from the > cpointer `p`. > > Then you can use `Sunsigned_value()` to convert that field value to a > pointer-sized integer, then case. > > I might have some part of that wrong, but it should be close... Of > course, there should be better support for record-field access and > cpointer extraction, so I'll add to the API. > > > At Mon, 13 Jul 2020 11:43:35 -0500, Nate Griswold wrote: > > I had a question. In embedded racket, I am passing a _cpointer value back > > to c code by way of racket_apply's return value. > > > > Looking over https://docs.racket-lang.org/inside/cs-values_types.html , > > there appears to be a group of functions associated with extracting > values > > from ptrs. I do not see one for a pointer ptr there. > > > > Is there a way to get at a returned _cpointer value from c code? > > > > Thanks > > > > Nate > > > > -- > > You received this message because you are subscribed to the Google > Groups > > "Racket Users" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to [email protected]. > > To view this discussion on the web visit > > > https://groups.google.com/d/msgid/racket-users/CAM-xLPrKGgAgii7BjyfvCs6i0BmbMp0 > > yoo09UoUF0nqVzX_CXQ%40mail.gmail.com. > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CAM-xLPrQ8Qv66eFRMuorqO%2BwqzutnPQVgZ79sPNjxKAgnij7CA%40mail.gmail.com.
