[Mingw-w64-public] COM GUID and IID question

[Georgi P. <gog...@gm...>]

Hi,

I have a quick question. I can't figure out something. I have the
following COM function definition:
STDAPI MFCreateVideoRenderer(REFIID riidRenderer, void ** ppVideoRenderer);

The first parameter (riidRenderer) is Interface indentifier (IID) of a
COM class. When calling MFCreateVideoRenderer, I want to pass a
particular IID, for example IID_IMFMediaSink.

In C++, I would write:
MFCreateVideoRenderer(__uuidof (IID_IMFMediaSink), ...

However, in C, this is not possible. The GUID of my desired interface
(IID_IMFMediaSink) is
0x6ef2a660,0x47c0,0x4666,0xb1,0x3d,0xcb,0xb7,0x17,0xf2,0xfa,0x2c and I
have defined it myself like this:

DEFINE_GUID(IID_IMFMediaSink,
0x6ef2a660,0x47c0,0x4666,0xb1,0x3d,0xcb,0xb7,0x17,0xf2,0xfa,0x2c);

Then how can I "convert" it to a suitable first parameter of
MFCreateVideoRenderer? I've been stuck with this problem for 2 days
and I really can't figure it out. Any help will be appreciated!

Georgi