Hi Tomas and Dirk,
Thanks for your suggestions! Between the two, got it working. I didn't know Windows didn't do rpath, I think that you're right that setting the PATH would have helped. I haven't seen that in an R package before, so I did what was in the Rblpapi package, which was creating a couple of copies of the dll in question. On a related note, in Rblpapi Makevars.win line 47 it's downloading and extracting the compiled library from GitHub. My understanding is that one shouldn't include pre-compiled libraries in R packages for security reasons, at least not for submitting to CRAN. Is doing it this way a good way around that? Thanks again! -Ezra On 12/23/21 09:34, Dirk Eddelbuettel wrote: > On 23 December 2021 at 11:07, Tomas Kalibera wrote: > | You can have a look at CRAN package Rblpapi which is using an external DLL. > > Yes with one big caveat: You have to make sure the library follows what is > the "hour-glass pattern": it needs to have an internal (the "narrow" part) C > library covering the wider underlying library and offered via a wider header. > > Only C linkage works across different compiler families. You just cannot use > a Virtual C++-made Windows DLL from R's MinGW g++ compiler with C++. > > But you can use C linkage. So some libraries (such as the Bloomberg API used > in Rblpapi and the TileDB API used in the tiledb package (when not using a > local build) can use a library following the hourglass pattern: > > - "wide" bottom layer (may be C++ or C) with the core implementation > > - "narrow" C layer accessing the bottom and priving an API providing via C > which profits from C's portable foreign function interface > > - "wide" layer on top via a header-only C++ file accesssing the C and > which the C++ compiler optimizes away so that the C API is used for > linking > > Sounds complicated, but works great. > > Good detail is in a hour-long but not-too-technical talk here > > https://www.youtube.com/watch?v=PVYdHDm0q6Y > > and slides etc are here > > > https://github.com/CppCon/CppCon2014/tree/master/Presentations/Hourglass%20Interfaces%20for%20C%2B%2B%20APIs > > Dirk > > -- > https://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
