Re: [Mingw-w64-public] IAudioEndpointVolume

[JonY <jo...@us...>]

On 10/5/2011 07:23, Chris Sutcliffe wrote:
> Hi All,
> 
> I'm using the x86_64 cross compiler under Cygwin using the latest
> mingw-w64 CRT available with Cygwin and I've run in to a snag using
> IAudioEndpointVolume.  I realize it may be an incomplete
> implementation as per the warning:
> 
> /usr/x86_64-w64-mingw32/sys-root/mingw/include/Endpointvolume.h:34:2:
> warning: #warning COM interfaces layout in this header has not been
> verified.
> /usr/x86_64-w64-mingw32/sys-root/mingw/include/Endpointvolume.h:35:2:
> warning: #warning COM interfaces with incorrect layout may not work at
> all.
> /usr/x86_64-w64-mingw32/sys-root/mingw/include/Endpointvolume.h:36:85:
> note: #pragma message: Interface IAudioEndpointVolume has unverified
> layout.
> 
> But I've hit a snag with __uuidof(IAudioEndpointVolume):
> 
> undefined reference to `_GUID const& __mingw_uuidof<IAudioEndpointVolume>()'
> 
> Is this expected (i.e. is the IAudioEndpointVolume interface not fully
> implemented)?
> 
> Thank you,
> 
> Chris
> 

__uuidof is really only implemented for gcc 4.7 or later, its emulated
with some C++ codes for earlier gcc.

Its possibly something wrong with the crt stuff, or the header itself, I
need to dig deeper.

As for the warnings, its mainly because most of the stuff is pulled
directly from MSDN without verification.