Thank you to your kind reply. =) I tried several times, but still got a same error message. (ㅠㅠ) But I'm going to googling with key-word that you told me. Thank you again. Best reguard S. Chang. 2019년 3월 2일 (토) 오전 3:03, Henk-Jan van Tuyl 님이 작성:

Did you try setting environment variable LIBRARY_PATH? Something like: Set LIBRARY_PATH=%LIBRARY_PATH%;C:\wxWidgets\lib You might need to set C_INCLUDE_PATH as well, for the header files.

Regards, Henk-Jan van Tuyl

On Tue, 26 Feb 2019 07:47:59 +0100, S. H. Aegis wrote:

...

Hello.

I’m new to stack & FFI.

I created a dll file by http://www.mingw.org/wiki/sampleDLL

[...]

...

*Configuring test2-0.1.0.0...* *Cabal-simple_Z6RU0evB_2.4.0.1_ghc-8.6.3.exe: Missing dependency on a foreign* *library:* ** Missing (or bad) C library: example_dll.a* [...] How can I fix this? I did a lot of things on the webpages, but I could not.

Please, help me.

Sincerely, S. Chang.

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Thank you to your kind reply. =) Unfortunately, I've got same error message. Thank you again. Best reguard S. Chang. 2019년 3월 2일 (토) 오전 4:42, Edgar Klerks 님이 작성:

You made a small typo:

example_dll.cpp, example_dll.dll, example_dll.h, example_dll.o, example_exe.cpp, *libexample_dll.a*

And in your code, you call it example_dll.a instead of libexample_dll.a:

...

extra-libraries: - example_dll.a

That should probably be:

extra-libraries: - libexample_dll.a

On Tue, Feb 26, 2019 at 7:48 AM S. H. Aegis wrote:

...

Hello.

I’m new to stack & FFI.

I created a dll file by http://www.mingw.org/wiki/sampleDLL

And I put all files into dll folder. (Those files are example_dll.cpp, example_dll.dll, example_dll.h, example_dll.o, example_exe.cpp, libexample_dll.a) I test example_exe.exe file, and confirmed that works.

(Windows7 Pro, stack 1.9.3)

executables:

test2-exe:

main: Main.hs

source-dirs: app

ghc-options:

- -threaded

- -rtsopts

- -with-rtsopts=-N

dependencies:

- test2

extra-libraries:

- example_dll.a

extra-lib-dirs:

- dll

# Extra directories used by stack for building

extra-include-dirs:

- dll

extra-lib-dirs:

- dll

{-# LANGUAGE ForeignFunctionInterface #-}

module Main where

-- import Lib

import Foreign

foreign import ccall "example_dll.h hello"

c_hello :: IO()

main :: IO ()

main = c_hello

#include

#include "example_dll.h"

__stdcall void hello(const char *s)

{

printf("Hello %s\n", s);

}

int Double(int x)

{

return 2 * x;

}

void CppFunc(void)

{

puts("CppFunc");

}

void MyClass::func(void)

{

puts("MyClass.func()");

}

When I try to stack build, I get error messages.

*C:\Users\shaegis\Documents\Haskell\test2\dll>stack build*

*Building all executables for `test2' once. After a successful build of all of them, only specified executables will be rebuilt.*

*test2-0.1.0.0: configure (lib + exe)*

*Configuring test2-0.1.0.0...*

*Cabal-simple_Z6RU0evB_2.4.0.1_ghc-8.6.3.exe: Missing dependency on a foreign*

*library:*

** Missing (or bad) C library: example_dll.a*

*This problem can usually be solved by installing the system package that*

*provides this library (you may need the "-dev" version). If the library is*

*already installed but in a non-standard location then you can use the flags*

*--extra-include-dirs= and --extra-lib-dirs= to specify where it is.If the*

*library file does exist, it may contain errors that are caught by the C*

*compiler at the preprocessing stage. In this case you can re-run configure*

*with the verbosity flag -v3 to see the error messages.*

*-- While building package test2-0.1.0.0 using:*

* C:\sr\setup-exe-cache\x86_64-windows\Cabal-simple_Z6RU0evB_2.4.0.1_ghc-8.6.3.exe --builddir=.stack-work\dist\e626a42b configure --with-ghc=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.3\bin\ghc.EXE --with-ghc-pkg=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.3\bin\ghc-pkg.EXE --user --package-db=clear --package-db=global --package-db=C:\sr\snapshots\3233b5e2\pkgdb --package-db=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\pkgdb --libdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\lib --bindir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\bin --datadir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\share --libexecdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\libexec --sysconfdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\etc --docdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\doc\test2-0.1.0.0 --htmldir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\doc\test2-0.1.0.0 --haddockdir=C:\Users\shaegis\Documents\Haskell\test2\.stack-work\install\784ab3f0\doc\test2-0.1.0.0 --dependency=base=base-4.12.0.0 --extra-include-dirs=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\include --extra-include-dirs=C:\Users\shaegis\Documents\Haskell\test2\dll --extra-lib-dirs=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\bin --extra-lib-dirs=C:\Users\shaegis\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\lib --extra-lib-dirs=C:\Users\shaegis\Documents\Haskell\test2\dll --enable-tests --enable-benchmarks*

*Process exited with code: ExitFailure 1*

How can I fix this? I did a lot of things on the webpages, but I could not.

Please, help me.

Sincerely, S. Chang. _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

_______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

-- Sok Ha, CHANG Dr. Chang's Clinic. #203. 503-23. AmSa-Dong, GangDong-Gu, Seoul. Tel: +82-2-442-7585