Brian Hulley wrote:
Brian Hulley wrote:
and compiled with
ghc -fglasgow-exts --make Main.hs -optl-lTestDLL -optl-L
Oops! I see I missed out the "." which I'd not realised was part of the command line (seems the linker need to be told explicity to look in the current directory also), so it links using:
ghc -fglasgow-exts --make Main.hs -optl-lTestDLL -optl-L.
I then copied Debug/TestDLL.dll into the current directory so that it is in the same directory as main.exe, but now I get an error when I run the application. It finds the dll ok, but then a dialog box pops up saying: "The application failed to initialize properly (0xc000007b)"
I found the answer. It seemed I didn't declare the C++ function properly. The correct function definition is: extern "C" __declspec(dllexport) int cfun(int x){ return x * 3; } so that the function name doesn't get mangled and it is exported. Best regards, Brian.