Answer / preeti

__declspec( dllexport ) - The class or function so tagged
will be exported from the DLL it is built in. If you're
building a DLL and you want an API, you'll need to use this
or a separate .DEF file that defines the exports (MSDN).
This is handy because it keeps the definition in one place,
but the .DEF file provides more options.

__declspec( dllimport ) - The class or function so tagged
will be imported from a DLL. This is not actually required -
you need an import library anyway to make the linker
happy. But when properly marked with dllimport, the
compiler and linker have enough information to optimize the
call; without it, you get normal static linking to a stub
function in the import library, which adds unnecessary
indirection.

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