On Sat, Mar 5, 2011 at 2:48 PM, Kai Tietz <[email protected]> wrote: > 2011/3/5 Georgi Petrov <[email protected]>: >> 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 > > Well, pretty easy. Just pass to this function the address of the GUID. > the __uuidof keyword in fact returns a const GUID * for C (for C++ it > is a const GUID &). > > Regards, > Kai
Hi Kai, I believe that __uuidof() is C++ specific operator only. At least this is the information I got from various places. When used in C, I get "implicit declaration of function '__uuidof'". The REFIID parameter which my function expects is actually "const struct GUID * const", while DEFINE_GUID is of type "GUID". Can you give me with a simple one line cast of some sort, which actually works? I'm pretty lost. ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Mingw-w64-public mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
