Re: syntax for function header/prototype and implementation

From:
"Ben Voigt [C++ MVP]" <rbv@nospam.nospam>
Newsgroups:
microsoft.public.vc.language
Date:
Fri, 3 Aug 2007 16:28:52 -0500
Message-ID:
<uoy4KVh1HHA.1336@TK2MSFTNGP04.phx.gbl>
"Alex Blekhman" <tkfx.REMOVE@yahoo.com> wrote in message
news:u7XH53g1HHA.4476@TK2MSFTNGP06.phx.gbl...

"Jeff Kish" wrote:

ah, so the __cdecl and the extern "C" work in concert then?


Apparently, yes.

that somewhat explains why I could not combine extern "C" and WINAPI.


`WINAPI' is a simple #define for `__stdcall'. Nothing more.

I was hoping the WINAPI would standardize things, as whether or not
__cdecl
put a leading underscore in front of a name depends on compiler
version/brand.


Name decoration is vendor specific, so each compiler has its own. That's
why there is .DEF files: in order to provide a developer with an
opportunity to specify exported names exactly as he/she wants.

Contrary to popular belief, `extern "C"' linkage specifier doesn't
suppress names decoration. It just instructs the linker to generate names,
which are compatible with another language (C, in this case). It happens
that C language doesn't use name mangling, so combined with `__cdecl'
calling convention function name stays as it is. If you want to export
undecorated name of a function declared with `__stdcall' calling
convention, then .DEF file is the only option.


extern "C" cdecl decorates with leading underscore

extern "C" stdcall decorates with size of args pushed on stack

without extern "C", you get the C++ mangling with all argument types, return
type, and namespace encoded

Use WINAPI (stdcall) and a .def file to match the Windows DLLs

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