How to Define COMPILING_DLL for Dynamic Linking in Windows DLLs?

Defining COMPILING_DLL for Dynamic Linking

When developing shared libraries using the macro-based approach to define __declspec(dllexport) and __declspec(dllimport) for Windows DLLs, it is essential to determine how to define COMPILING_DLL.

The default approach involves utilizing a preprocessor macro defined locally to the project under Properties -> C/C -> Preprocessor -> Preprocessor Definition. For instance, if your project is named "MyDLL," the default macro would be MYDLL_EXPORTS. By default, MYDLL_EXPORTS is defined as "export" when compiling the DLL project and as "import" when using the DLL file from the client side.

An alternative approach is to use the following macros:

#ifdef MYDLL_EXPORTS // export
#define DLLEXPORT __declspec(dllexport)
#else // import
#define DLLEXPORT __declspec(dllimport)
#endif

By utilizing either the default macro or the alternative macros, you can effectively control the dynamic linking behavior of your DLLs, facilitating seamless communication between exported and imported functions.

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