[FFmpeg-devel] [PATCH] Add Win32 GDI-based screen grabbing

[Eli Kara]

> > >  7 files changed, 719 insertions(+)  create mode 100644 
> > > libavdevice/gdigrab.c
> >
> > this breaks compilation with mingw
> >
> > ffmpeg/libavdevice/gdigrab.c: In function 'gdigrab_region_wnd_init':
> > ffmpeg/libavdevice/gdigrab.c:162:29: error: 'GWL_WNDPROC' undeclared
> (first use in this function)
> > ffmpeg/libavdevice/gdigrab.c:162:29: note: each undeclared 
> > identifier is
> reported only once for each function it appears in
> > ffmpeg/libavdevice/gdigrab.c: In function 'gdigrab_read_packet':
> 
> That should probably be *GWLP_**WNDPROC*. See 
> http://msdn.microsoft.com/en-us/library/windows/desktop/ms644898(v=vs.85).aspx.
> 
> But I'm not sure if that will fix compilation though. Are you using 
> MinGW32
> (i686-pc-mingw32) or mingw-w64 (*-w64-mingw32)?

> 64bit

I just have to mention this - the SetWindowLongPtr function replaces SetWindowLong as it was limited to 32-bit DWORD values. Supported as of Windows 2000.
So, to properly build under borth 32-bit and 64-bit, only SetWindowLongPtr should be used. The constants change accordingly, in this case GWLP_WNDPROC as
mentioned before.
When compiling for 32-bit, SetWindowLongPtr is actually defined to be SetWindowLong.

Regards,
Eli