导出DLLRegisterServer接口遇到的问题

I'm trying to add DLLRegisterServer and DLLUnregisterServer entry points to an existing DLL that is exporting other functions. I have the olectl.h header included and here is the code I'm using to export the functions

EXTERN_C _declspec(dllexport) HRESULT STDAPICALLTYPE DllRegisterServer(void);
EXTERN_C _declspec(dllexport) HRESULT STDAPICALLTYPE DllUnregisterServer(void);

And here are the errors I get:
1> : error C2375: 'DllRegisterServer' : redefinition; different linkage
1>        C:Program FilesMicrosoft Visual Studio 8VCPlatformSDKincludeolectl.h(419) : see declaration of 'DllRegisterServer'
1> : error C2375: 'DllUnregisterServer' : redefinition; different linkage
1>        C:Program FilesMicrosoft Visual Studio 8VCPlatformSDKincludeolectl.h(420) : see declaration of 'DllUnregisterServer'

Can anyone tell me what I'm doing wrong with these exports?

 

【解决方法】

You'll have to define them (not declare them) in a source code file that doesn't #include <olectl.h>.  However, COM components usually use a .def file to export entries since there are only four of them.  That allows you to omit the __declspec and avoid the error.  Make it look like this:

EXPORTS
        DllCanUnloadNow     @1 PRIVATE
        DllGetClassObject   @2 PRIVATE
        DllRegisterServer   @3 PRIVATE
        DllUnregisterServer     @4 PRIVATE