Using one extension DLL in another
The value of AFX_EXT_CLASS will cause your new DLL to try and export your dependent classes! You will get link errors such as below for the classes in the first DLL:
error LNK2001: unresolved external symbol ..........
//change the definition of AFX_EXT... to
make it import
#undef AFX_EXT_CLASS
#undef AFX_EXT_API
#undef AFX_EXT_DATA
#define AFX_EXT_CLASS AFX_CLASS_IMPORT
#define AFX_EXT_API AFX_API_IMPORT
#define AFX_EXT_DATA AFX_DATA_IMPORT
//Include headers for the dll / lib that we
use classes from
#include "DLLOne.H"
//put the values back to make AFX_EXT_CLASS
export again
#undef AFX_EXT_CLASS
#undef AFX_EXT_API
#undef AFX_EXT_DATA
#define AFX_EXT_CLASS AFX_CLASS_EXPORT
#define AFX_EXT_API AFX_API_EXPORT
#define AFX_EXT_DATA AFX_DATA_EXPORT
//Include headers for the classes we are
creating in this DLL
#include "DLLTwo.H"
Posted: March, 8, 98
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