[cffi-devel] calling a function of the same name from two DLLs

[Jack Unrue]

Hello, CFFI folks. What are the implications of declaring two foreign functions,
each foreign name being the same but which are implemented in two separate
DLLs? The specific case I have in mind is the Win32 function DllGetVersion,
which can return different meta-data for comctl32.dll vs. shell32.dll.

I am effectively doing the following right now:

    (load-foreign-library "comctl32.dll")

    (defcfun
      ("DllGetVersion" comctl-dll-get-version)
      HRESULT
      (info :pointer))

    (load-foreign-library "shell32.dll")

    (defcfun
      ("DllGetVersion" shell-dll-get-version)
      HRESULT
      (info :pointer))

Is there any caching of CFFI foreign function meta-data behind the scenes,
perhaps keyed by the foreign function name? Such as might be causing
identical results no matter which is called first, or which load-foreign-library
occurs first?

Note: my WinXP install has several different versions of comctl32.dll, one of
which matches the shell32.dll version, but I have at least one configuration
where I know the result really is wrong (as if the result from the other
DllGetVersion call was being cached).

-- 
Jack Unrue