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https://lira.kraamwinkel.be/articles/haskell_ffi

A while ago I wrote about the Foreign Function Interface in Haskell and how to make a desktop application with Qt6.

The following topics are covered:

• Using foreign import to call C or C++-functions (without name mangling);
• Using foreign export to call Haskell-functions in C or C++
• How to create pointers that get freed automatically to prevent memory issues;
• How to create arrays in Haskell;
• How to create structs in Haskell (manually and via GStorable);
• How to create function pointers in Haskell;
• Why MonadReader (IORef [a]) m is better for storing pointers than MonadState [a] m;
• The difference between ccall and capi

I already shared it on my previous account back then, but I am posting it here now too :)