how to understand those #define in secp256k1.h?

[jscode017]

Are there any resources that can help understanding those #define statement(e.g: #   define SECP256K1_API __declspec(dllexport)) and those starts with # in secp256k1.h?
Are there some web resources or some book to read?
recently work on a project that has to include secp256k1.h

help please

[jscode017]

thanks for the help
but still wants to know are there any relating c++ resources to understand those statements behind #
cause the code looks a little intricate for me

[jscode017]

Thanks
this will probably solve my problem

[odolvlobo]

Are there any resources that can help understanding those #define statement(e.g: #   define SECP256K1_API __declspec(dllexport)) and those starts with # in secp256k1.h?
Are there some web resources or some book to read?
recently work on a project that has to include secp256k1.h

If you are asking about #define, then this might help: https://www.techonthenet.com/c_language/constants/create_define.php

If you are asking about __declspec(dllexport), then this might help: https://msdn.microsoft.com/en-us/library/a90k134d.aspx

[jscode017]

thanks for help   
this is awesome