When writing a C++ function library for unity, macros are generally used:
#if defined(BUILD_AS_DLL)
#define API __declspec(dllexport)
#else
#define API extern
#endif
This allows a macro BUILD_AS_DLLto toggle whether the interface is exported or not.
When developing, do not add the BUILD_AS_DLL macro, project properties - general - configuration type is set to run the program exe
and then make a bat, add macros to generate dll:
cl /LD /Zi /Od main.c -DBUILD_AS_DLL /WX -o MAIN.dll
Among them:
/LD means to generate dll
/Zi means to generate debugging information
/Od means to disable optimization
When compiling a release dll, generally use:
cl /LD /O2 main.c -DBUILD_AS_DLL /WX -o MAIN.dll
Put the generated dll in the Assets\Plugins\x86_64 directory of the unity project to use it.
[DllImport("LuaCallCPP")]
public static extern int add(int a, int b);
The generated dll of the debug version can be debugged using vs studio. Attach to the process and find unity.