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Asked: 2026-05-25T15:58:25+00:00

I am trying to build a Dynamic DLL in VC++ 2008, now in a

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I am trying to build a Dynamic DLL in VC++ 2008, now in a .h file, I declare the following

#ifndef  PREFILTER_LIBRARY_H
#define  PREFILTER_LIBRARY_H

#ifdef PREFILTER_EXPORTS
#   define PREFILTER_API __declspec(dllexport)
#else
#   define PREFILTER_API __declspec(dllimport)
#endif

#endif

While in the PreFilter.h file I am writing

class PREFILTER_API  PreFilter
{
...
};

The problem is I keep getting:

warning C4273: 'PreFilter::Apply' : inconsistent dll linkage

I see that the dllexport part of the above macros is not highlighted and is commented which should have been the other way around, plus I have another .h file that contains Apply() method.

Can’t figure out what I am doing wrong here. I am trying to export the functions of PreFilter.h

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1 Answer

  1. Editorial Team

    Add PREFILTER_EXPORTS to the list of preprocessor constants in Dll project settings: Project – Properties – Configuration Properties – C++ – Preprocessor – Preprocessor definitions.

    When this file is used in Dll project, PREFILTER_EXPORTS is defined in the project, and PREFILTER_API is expanded as __declspec(dllexport). In any other project, where PREFILTER_EXPORTS is not defined, PREFILTER_API is expanded as __declspec(dllimport).

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