Dll Header

Code:

---

#ifndef _DLL_H_
#define _DLL_H_

#if BUILDING_DLL
# define DLLIMPORT __declspec (dllexport)
#else /* Not BUILDING_DLL */
# define DLLIMPORT __declspec (dllimport)
#endif /* Not BUILDING_DLL */


DLLIMPORT void HelloWorld (void);


#endif /* _DLL_H_ */

---

Here is a standard devc++ header file for a dll.
What does BUILDING_DLL mean and if I change the name of the header file to loop.h should i change _DLL_H_?

BUILDING_DLL would (one can presume) be set if the IDE thinks that it's currently building a DLL, as opposed to when it is USING an external DLL.

It is considered good style to have some sort of relationship between the include guards and the filename [or rather, you don't want "loop.h" to prevent you from including a valid "dll.h" later on in life].

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Mats