I have the following in my library
#define FIXED_LEN_STR 255
typedef char fixed_len_str_t[FIXED_LEN_STR];

In my cdef("""
#define FIXED_LEN_STR ...   // This works
typedef char fixed_len_str_t[...];   // this does not work
""")  

Is my only choice to explicitly do the following? Is there a better way of
doing this?
typedef char fixed_len_str_t[255];

Also, the Error message when it hits the problem is as follows, which
doesn't tell me where the error is.
For now I understand this generally means and where to look. But for people
with no experience with CFFI,
 it would be help full to provide some context or line numbers or something
to help locate the point the cdef where this error happens.

File
"/ws/sarvi-sjc/skunkworks/tmproot/lib/python2.6/site-packages/cffi-0.4-py2. 6-linux-x86_64.egg/cffi/api.py",
line 84, in cdef
    self._parser.parse(csource, override=override)
  File
"/ws/sarvi-sjc/skunkworks/tmproot/lib/python2.6/site-packages/cffi-0.4-py2. 6-linux-x86_64.egg/cffi/cparser.py",
line 100, in parse
    self._internal_parse(csource)
  File
"/ws/sarvi-sjc/skunkworks/tmproot/lib/python2.6/site-packages/cffi-0.4-py2. 6-linux-x86_64.egg/cffi/cparser.py",
line 137, in _internal_parse
    realtype = self._get_type(decl.type, name=decl.name)
  File
"/ws/sarvi-sjc/skunkworks/tmproot/lib/python2.6/site-packages/cffi-0.4-py2. 6-linux-x86_64.egg/cffi/cparser.py",
line 222, in _get_type
    typenode.dim, partial_length_ok=partial_length_ok)
  File
"/ws/sarvi-sjc/skunkworks/tmproot/lib/python2.6/site-packages/cffi-0.4-py2. 6-linux-x86_64.egg/cffi/cparser.py",
line 446, in _parse_constant
    raise api.FFIError("unsupported non-constant or "
cffi.api.FFIError: unsupported non-constant or not immediately constant
expression

Thanks,
Sarvi

I have always got quick responses so far, but haven't seen any for my recent questions.

Are these dumb questions, possibly? Or maybe too many questions :-))

I have always tried multiple routes at debugging and googling for answers before asking these questions.
And from what I can tell, all the questions I have asked so far, bar 1 which ended being a bug in my library, ended in either a bug fix or document update.

I hope this is just a case of people being too busy. :-))

Sarvi

Hi,

Yes, exactly :-)  Your questions are very useful, I have to thank you
for them.  They end up in good suggestions for improvements of CFFI.
I'll come back to your recent questions, but right now I'm at PyCon ZA
(South Africa) :-)

A bientôt,

Armin.

I noticed that
char my_array_variable[...];  // Does not work

But the following works
char my_array_variable[];  // This works

The original header files has
#define XYZ_LEN 255
char my_array_variable[XYZ_LEN];

Thx,
Sarvi

Hi,

I fixed this use case to make the two declarations identical (3bb5d49c0c00).

A bientôt,

Armin.