A common cause of this is you don't have installed the libraries that the library you're trying to load depends on.
Since you are using the libvid library it depends on libavutil, which is not (currently) listed as a dependency in the libvid-x86_64-macosx package[1]. Can you try installing the ffmpeg-x86_64-macosx package on your machine and see if it still works? If not, can you show us the list of files in your /Users/spdegabrielle/Library/Racket/7.2/lib and /Applications/Racket v7.2/lib directories? Hope that helps. [1]: That was my fault. I probably should have listed it. I never really imagined libvid being used without the video package, which _does_ have the required deps. I'll update the deps for that package, thanks for pointing out the problem. On 4/1/19, Stephen De Gabrielle <spdegabrie...@gmail.com> wrote: > Hi, > > I'm trying to work out how to use 'copy-foreign-libs' [1], but not having > much luck. I believe the implementation of the collection using ' > copy-foreign-libs' is correct because it works in '#lang video', but I've > been unable to use it myself. > > I created a collection 'testffi-1' that would make use of the > existing(known working) 'libvid-x86_64-macosx' package [2] used by `#lang > video`. > > I installed 'testffi-1' with 'raco pkg install' , but attempts to call it > with a short test program fail with an error that the foreign library > cannot be found. > > Thinking that I hadn't 'provided'ed the foreign lib to my test script let > me to create a 'main.rkt' in 'testffi-1', but that also fails to fine the > foreign lib with the same error message, and using the DrRacket 'trace' > functionality seems to blame 'kw.rkt' (/Applications/Racket > v7.2/collects/racket/private/kw.rkt: 1325:47), which seems odd to me > because the error is in my code, not in the standard racket libs. > > I used (require setup/dirs > <https://docs.racket-lang.org/raco/dirs.html?q=get-lib-dirs>) to see if the > foreign lib was included, but > get-lib-search-dirs > <https://docs.racket-lang.org/raco/dirs.html#%28def._%28%28lib._setup%2Fdirs..rkt%29._get-lib-search-dirs%29%29> > returns > /Users/spdegabrielle/Library/Racket/7.2/lib /Applications/Racket v7.2/lib > when called from both the test script and the 'testffi-1' collection. > > Any suggestions on how I can test or resolve this issue would be > appreciated. > > Kind regards, > Stephen > > * 'copy-foreign-libs' : * > https://github.com/videolang/native-pkgs/blob/master/libvid-x86_64-macosx/info.rkt > > *test program: * > #lang racket > (require ffi/unsafe) > (require testffi-1) > (define libvid-val (ffi-lib (string-append "libvid") "0")) > (displayln libvid-val) > > > *'main.rkt' in 'testffi-1'* > #lang racket/base > (require ffi/unsafe) > ;(ffi-lib? "libvid.0.dylib") > > (define libvid-val (ffi-lib (string-append "libvid") "0")) > > (displayln libvid-val) > > > *Error* > Welcome to DrRacket, version 7.2 [3m]. > Language: racket, with debugging; memory limit: 2048 MB. > *. . ../../../Applications/Racket > v7.2/collects/racket/private/kw.rkt:1325:47: ffi-lib: couldn't open > "libvid.0.dylib" (dlopen(libvid.0.dylib, 6): image not found)* >> > > *tracing the error : * > ffi-lib: couldn't open "libvid.0.dylib" (dlopen(libvid.0.dylib, 6): image > not found) > ffi-lib: couldn't open "libvid.0.dylib" (dlopen(libvid.0.dylib, 6): image > not found) > > > *package used set deps 'testffi-1' * > #lang info > (define collection "testffi-1") > (define deps '("base" > ("libvid-x86_64-macosx" #:platform "x86_64-macosx"))) > (define build-deps '("scribble-lib" "racket-doc" "rackunit-lib")) > (define scribblings '(("scribblings/testffi.scrbl" ()))) > (define pkg-desc "testffi Description Here") > (define version "0.1") > (define pkg-authors '(spdegabrielle)) > > [1] 'copy-foreign-libs' in '6.3 Controlling raco setup with "info.rkt" > Files' > https://docs.racket-lang.org/raco/setup-info.html?q=copy-foreign-libs#%28idx._%28gentag._21._%28lib._scribblings%2Fraco%2Fraco..scrbl%29%29%29 > > > [2] https://pkgs.racket-lang.org/package/libvid-x86_64-macosx > > -- > 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 racket-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- ~Leif Andersen -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
