Tried to compile on Raspberry PI

[fsoustra]

Hi Jim,
I love that someone finally is working on a real wrapper for gphoto2 for python.
I tried to compile on a raspberry PI as I am starting a series of time lapse scripts and I got the following, my days of C are a bit behind me so not sure if I am missing a dev or if its something else below is the output of what I ran:

*running build
running build_py
copying source/gphoto2_camera.py -> build/lib.linux-armv6l-2.7/gphoto2
copying source/gphoto2_abilities_list.py -> build/lib.linux-armv6l-2.7/gphoto2
running build_ext
building '_gphoto2_camera' extension
swigging source/gphoto2_camera.i to source/gphoto2_camera_wrap.c
swig -python -I/usr/include -builtin -O -Wall -o source/gphoto2_camera_wrap.c source/gphoto2_camera.i
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c source/gphoto2_camera_wrap.c -o build/temp.linux-armv6l-2.7/source/gphoto2_camera_wrap.o -O3 -Wno-unused-variable
source/gphoto2_camera_wrap.c: In function ‘_wrap_gp_camera_get_port_info’:
source/gphoto2_camera_wrap.c:5536:5: error: incompatible type for argument 2 of ‘SWIG_Python_NewPointerObj’
source/gphoto2_camera_wrap.c:2547:1: note: expected ‘void ’ but argument is of type ‘GPPortInfo’
error: command 'gcc' failed with exit status 1

Thanks for the help

Cheers

Fred

[jim-easterbrook]

I just tried it on my Pi and got the same result. It's got an earlier version of SWIG (2.0.7) than I've been using on my main machine (2.0.10). The problem is in the typemaps for gp_port_info_new(), which I don't think would ever be called from Python, so doesn't really need wrapping. (But who knows what someone might want to do...)
I'll commit a bug fix now.

[jim-easterbrook]

PS I haven't tested any image capture stuff - you may find things you need are missing or "not properly joined up". Do let me know of any problems you run into.

[fsoustra]

Thanks Jim.
Will do.

[tomriddle1234]

Thanks Jim, I got the same issue but on ubuntu 12.04 with default swig 2.04 installation.

[fsoustra]

Got this issue arising now:

*gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c source/lib/gphoto2_camera_wrap.c -o build/temp.linux-armv6l-2.7/source/lib/gphoto2_camera_wrap.o -O3 -Wno-unused-variable
source/lib/gphoto2_camera_wrap.c: In function ‘_wrap_gp_camera_get_port_info’:
source/lib/gphoto2_camera_wrap.c:5536:5: error: incompatible type for argument 2 of ‘SWIG_Python_NewPointerObj’
source/lib/gphoto2_camera_wrap.c:2547:1: note: expected ‘void ’ but argument is of type ‘GPPortInfo’
error: command 'gcc' failed with exit status 1

gcc version 4.6.3 (Debian 4.6.3-14+rpi1)
and
SWIG Version 2.0.7
and python 2.7.3

[jim-easterbrook]

Doh! The perils of testing on one machine and committing to GitHub from a different one. I removed the wrong asterisk in commit 9e7f9f2. This is still the same problem. Commit 533eb33 should fix it.

[jim-easterbrook]

Unfortunately, although this change allows it to compile with older SWIG versions, it causes a segfault when gp_camera_set_port_info() is called. Some more work needed.

[jim-easterbrook]

I think I've found the problem. It's nothing to do with SWIG, it's the version of libgphoto2. The API changed in version 2.5 (see http://www.gphoto.org/news/) - my Pi only has version 2.4.14. I'm surprised I managed to build python-gphoto2 at all. You certainly need version 2.5 to run the example programs.
(The difference responsible for this bug is that in 2.5 GPPortInfo is a pointer to a structure, in 2.4 it's the structure itself. Quite a big difference!)

[jim-easterbrook]

Commit 9d1f71e allows building with gphoto2 version 2.4 or 2.5. Some of the examples work with version 2.4 as well (tested with my Canon DSLR connected to a Raspberry Pi).