Re: make-c-struct and pointer->string

Hello Mark, > >> 'make-c-struct' copies the C pointers from those foreign pointer objects, > >> but > >> not not keep a reference to the objects themselves. > > To me, this sounds very counter intuitive, actually, it sounds like a bug, > > make-c-struct should be holding a reference to the po

Re: make-c-struct and pointer->string

Hi David, David Pirotte writes: >> 'make-c-struct' copies the C pointers from those foreign pointer objects, >> but not >> not keep a reference to the objects themselves. > > To me, this sounds very counter intuitive, actually, it sounds like a bug, > make-c-struct should be holding a referenc

Re: make-c-struct and pointer->string

Hi David, David Pirotte writes: >> 'make-c-struct' copies the C pointers from those foreign pointer objects, >> but not >> not keep a reference to the objects themselves. > > To me, this sounds very counter intuitive, actually, it sounds like a bug, > make-c-struct should be holding a referenc

Re: make-c-struct and pointer->string

Hi Mark, Thanks for your help. > > ... > > scheme@(guile-user)> (make-c-struct (list '* '*) (list (string->pointer > > "hello > > ") (string->pointer "there!"))) $16 = # > > scheme@(guile-user)> (parse-c-struct $16 (list '* '*)) > > $17 = (# #) > > scheme@(guile-user)> (map pointer->string $17)

Re: make-c-struct and pointer->string

Hi David, David Pirotte writes: > Hello, > > guile 2.2.4.1-cdb19 > > ,use (system foreign) > > ;; this fails > > scheme@(guile-user)> (make-c-struct (list '* '*) (list (string->pointer > "hello ") (string->pointer "there!"))) > $16 = # > scheme@(guile-user)> (parse-c-struct $16 (list '* '

Re: make-c-struct and pointer->string

On Fri, 29 Mar 2019, 09:46 David Pirotte, wrote: > Hi again, > > > ... > > Following your explanation and example, I tried this and thought it > would work > > then, but it also failed: > > > GNU Guile 2.2.4.1-cdb19 > > > Enter `,help' for help. > > scheme@(guile-user)> ,use (system foreign) > >

Re: make-c-struct and pointer->string

Hi again, > ... > Following your explanation and example, I tried this and thought it would work > then, but it also failed: > GNU Guile 2.2.4.1-cdb19 > Enter `,help' for help. > scheme@(guile-user)> ,use (system foreign) > scheme@(guile-user)> (define str-1 "Hello") > scheme@(guile-user)> (def

Re: make-c-struct and pointer->string

Hello Neil, > I guess it may be GC. I've had problems with code like > >(procedure->pointer void (lambda (...) ...) args...) > > because procedure->pointer does not protect the (lambda ...) from being GC'd. > > For example: > http://git.savannah.nongnu.org/cgit/ossaulib.git/commit/?id=1d31

Re: make-c-struct and pointer->string

On Thu, 28 Mar 2019 at 15:15, Amirouche Boubekki wrote: > > Eventually, I can reproduced the issue with guile-next from guix: > > scheme@(guile-user) [1]> (make-c-struct (list '* '*) (list (string->pointer > "hello ") (string->pointer "there!"))) > $5 = # > scheme@(guile-user) [1]> (parse-c-struc

Re: make-c-struct and pointer->string

Hi Amirouche, I should add to your own answer that you actually were unable to reproduce the problem while using the latest 2.2 release tarball (the one that Ubuntu packages to be (even) more precise), as one can see on your gnome paste earlier today [1] So, if this is corect, there must be a co

Re: make-c-struct and pointer->string

Eventually, I can reproduced the issue with guile-next from guix: scheme@(guile-user) [1]> (make-c-struct (list '* '*) (list (string->pointer "hello ") (string->pointer "there!"))) $5 = # scheme@(guile-user) [1]> (parse-c-struct $5 (list '* '*)) $6 = (# #) scheme@(guile-user) [1]> (map pointer->st

make-c-struct and pointer->string

Hello, guile 2.2.4.1-cdb19 ,use (system foreign) ;; this fails scheme@(guile-user)> (make-c-struct (list '* '*) (list (string->pointer "hello ") (string->pointer "there!"))) $16 = # scheme@(guile-user)> (parse-c-struct $16 (list '* '*)) $17 = (# #) scheme@(guile-user)> (map pointer->st