the cdef() gets definition of struct but the wrapper still throws ffi.error of undefined struct/union name

Question

I have a problem in a bigger project but I managed to isolate it into a smallest possible example. Please take a look.

The def.c file that contains a definition of a struct

typedef struct {
  unsigned char data[64];
} somestruct;

a build.py file that builds the cffi wrapper

import os

from cffi import FFI, VerificationError

basepath = os.path.abspath(os.path.dirname(__file__))

ffi = FFI()

# the def.c is both header and source
with open(basepath + '/def.c', 'rt') as fid:
    _source = fid.read()
    ffi.cdef(_source)

ffi.set_source(
    "some_examples",
    _source,
    extra_compile_args=['-g']
)

ffi.compile()

the file run.py that attempts to instantiate an empty struct

from some_examples import ffi, lib

ffi.new('struct somestruct *')

How to run

python build.py
python run.py

what I get

Traceback (most recent call last):
  File "run.py", line 3, in <module>
    ffi.new('struct somestruct *')
ffi.error: undefined struct/union name
struct somestruct *
       ^

I researched it a bit, this answer was helpful but it indicated that definition must be in cdef() which is the case here. Anyone has some ideas why is somestruct undefined?

the cdef() gets definition of struct but the wrapper still throws ffi.error of undefined struct/union name

0 Answers0