From:	colin AT bird DOT fu DOT is DOT saga-u DOT ac DOT jp (Colin Peters)
Subject:	RE: libwinmm.a
27 Mar 1997 00:42:53 -0800 :
Approved:	cygnus DOT gnu-win32 AT cygnus DOT com
Distribution:	cygnus
Message-ID:	<01BC39F2.3CDCBF60.cygnus.gnu-win32@gbird0>
Mime-Version:	1.0
Original-To:	"'George Kechriotis'" <george2 AT ccs DOT neu DOT edu>
Original-Cc:	"'GNU-Win32'" <gnu-win32 AT cygnus DOT com>
Original-Sender:	owner-gnu-win32 AT cygnus DOT com

George Kechriotis[SMTP:george2 AT ccs DOT neu DOT edu] wrote:
>I'm trying to compile a code that uses the waveInGetNumDevs 
>call (multimedia). I checked in libwinmm.a and it seems that 
>this function is there. However when I compile the code
>it can not resolve the function call. I tried gcc -lwinmm 
>but no luck either. Has anyone tried something similar?

-lwinmm is the right option, but you need to have the
correct prototype for waveInGetNumDevs. Unfortunately
the current win32-api headers do not include that. The
prototype is:

UINT WINAPI waveInGetNumDevs ();

Seems pretty simple, but in the win32-api include file
base.h (included from windows.h) WINAPI is set (indirectly)
to __attribute__ ((stdcall)), which is important for telling
gcc how to properly mangle the name to get the name actually
in libwinmm.a (doing an nm libwinmm.a | grep waveInGetNumDevs
shows you the mangled form, with an @0 at the end).

Eventually I, you, or someone is going to end up writing a
complete version of mmsystem.h with this and the other
definitions for multi-media under Win32, but it hasn't
happened yet (unfortunately).

Colin.

-- Colin Peters - colin AT bird DOT fu DOT is DOT saga-u DOT ac DOT jp
-- Saga University Dept. of Information Science
-- http://www.fu.is.saga-u.ac.jp/~colin/index.html
-- http://www.geocities.com/Tokyo/Towers/6162/

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