I'm trying to use.embedding_api cffi.api.and getting CDefError: cannot parse

[joni...@gmail.com]

Hi

I'm trying the new embedding api but got in trouble right away.

I'm trying to use this code based on the embedding example, I'm trying to make a Far manager plugin and the type declarations come from this plugin.hpp

I'm on Windows 7 Ultimate 64bit, Python 2.7.10 and Visual Studio 2015

PythonFar.py

# file plugin_build.py
import re
import cffi
ffibuilder = cffi.FFI()

with open('PythonFar.h') as f:
    include = f.read()

ffibuilder.embedding_api(include)

ffibuilder.set_source("PythonFar",
        re.sub(r'^extern(?=\s)', 'CFFI_DLLEXPORT', include, flags=re.M))


ffibuilder.embedding_init_code("""
    from PythonFar import ffi

    @ffi.def_extern()
    def adapter_Initialize(Info):
        print("adapter_Initialize")
        return True
""")

ffibuilder.compile(target="PythonFar.*", verbose=True)

PythonFar.h

typedef unsigned int     size_t;
typedef unsigned short wchar_t;

typedef struct _GUID {
        unsigned long  Data1;
        unsigned short Data2;
        unsigned short Data3;
        unsigned char  Data4[ 8 ];
} GUID;

enum VERSION_STAGE
{
    VS_RELEASE                      = 0,
    VS_ALPHA                        = 1,
    VS_BETA                         = 2,
    VS_RC                           = 3,
};

struct VersionInfo
{
  DWORD Major;
  DWORD Minor;
  DWORD Revision;
  DWORD Build;
  enum VERSION_STAGE Stage;
};

struct GlobalInfo
{
    size_t StructSize;
    struct VersionInfo MinFarVersion;
    struct VersionInfo Version;
    GUID Guid;
    const wchar_t *Title;
    const wchar_t *Description;
    const wchar_t *Author;
    void* Instance;
};

extern BOOL WINAPI adapter_Initialize(GlobalInfo* Info);

D:\Documents\GitHub\Python-support-for-Far-manager\CFFI>py -2.7-32 "PythonFar.py"
Traceback (most recent call last):
  File "PythonFar.py", line 11, in <module>
    ffibuilder.embedding_api(include)
  File "D:\Python27.x86\lib\site-packages\cffi\api.py", line 108, in embedding_api
    self._cdef(csource, packed=packed, dllexport=True)
  File "D:\Python27.x86\lib\site-packages\cffi\api.py", line 119, in _cdef
    self._parser.parse(csource, override=override, **options)
  File "D:\Python27.x86\lib\site-packages\cffi\cparser.py", line 299, in parse
    self._internal_parse(csource)
  File "D:\Python27.x86\lib\site-packages\cffi\cparser.py", line 304, in _internal_parse
    ast, macros, csource = self._parse(csource)
  File "D:\Python27.x86\lib\site-packages\cffi\cparser.py", line 262, in _parse
    self.convert_pycparser_error(e, csource)
  File "D:\Python27.x86\lib\site-packages\cffi\cparser.py", line 291, in convert_pycparser_error
    raise api.CDefError(msg)
cffi.api.CDefError: cannot parse "extern BOOL  volatile volatile const  adapter_Initialize(GlobalInfo* Info);"
:43:68: before: *

If I change the GlobalInfo to for example int it compiles without error and the embedding example works (with a small tweak) so I'm totally lost. Any help?

[joni...@gmail.com]

I forgot I'm using 32 bit Python as I need it to be a 32-bit .dll

[Armin Rigo]

Hi,

On 26 September 2016 at 12:02, <joni...@gmail.com> wrote:
> struct GlobalInfo

> extern BOOL WINAPI adapter_Initialize(GlobalInfo* Info);

These two lines are not compatible. You need either to say 'struct
GlobalInfo' instead of 'GlobalInfo' whenever you use that type, or you
need to use a typedef. (For all I know it might be correct in C++,
but not in C.)


A bientôt,

Armin.

[joni...@gmail.com]

On Monday, September 26, 2016 at 1:47:04 PM UTC+2, Armin Rigo wrote:

These two lines are not compatible.  You need either to say 'struct
GlobalInfo' instead of 'GlobalInfo' whenever you use that type, or you
need to use a typedef.  (For all I know it might be correct in C++,
but not in C.)

Thanks, I assumed it was something simple, and it did cross my mind (then I forgot it)  the example code that syntax comes from is C++, but I found no other examples, so I used what I had.

Now I get "distutils.errors.DistutilsPlatformError: Unable to find vcvarsall.bat" but I should be able to fix it again.