1

使用 cffi，我试图在 Python 代码中调用一些 Rust 函数。这是python代码：

from cffi import FFI

def rust(solution):
    ffi = FFI()
    lib = ffi.dlopen("./libnorm.so")
    ffi.cdef('float norm(float**)')

    return lib.norm(solution)

solution = [[1, 1], [1, 2], [1, 3], [1, 4], [1, 5], [1, 6]]
print(rust(solution))

这是锈代码：

#! [crate_type = "dylib"]

#[no_mangle]
pub extern fn norm(array: Vec< Vec<f64>>) -> f64 {
    return array.len() as f64
}

我编译了这个库：

rustc --crate-type=dylib norm.rs

但是当我运行我的 python 脚本时，我得到了这个堆栈：

Traceback (most recent call last):
  File "/usr/lib64/python3.5/site-packages/cffi/cparser.py", line 260, in _parse
    ast = _get_parser().parse(csource)
  File "/usr/lib/python3.5/site-packages/pycparser/c_parser.py", line 151, in parse
    debug=debuglevel)
  File "/usr/lib/python3.5/site-packages/pycparser/ply/yacc.py", line 331, in parse
    return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
  File "/usr/lib/python3.5/site-packages/pycparser/ply/yacc.py", line 1181, in parseopt_notrack
    tok = call_errorfunc(self.errorfunc, errtoken, self)
  File "/usr/lib/python3.5/site-packages/pycparser/ply/yacc.py", line 193, in call_errorfunc
    r = errorfunc(token)
  File "/usr/lib/python3.5/site-packages/pycparser/c_parser.py", line 1723, in p_error
    self._parse_error('At end of input', self.clex.filename)
  File "/usr/lib/python3.5/site-packages/pycparser/plyparser.py", line 55, in _parse_error
    raise ParseError("%s: %s" % (coord, msg))
pycparser.plyparser.ParseError: : At end of input

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "main.py", line 35, in <module>
    print(rust(solution))
  File "main.py", line 28, in rust
    ffi.cdef('float norm(float**)')
  File "/usr/lib64/python3.5/site-packages/cffi/api.py", line 105, in cdef
    self._cdef(csource, override=override, packed=packed)
  File "/usr/lib64/python3.5/site-packages/cffi/api.py", line 119, in _cdef
    self._parser.parse(csource, override=override, **options)
  File "/usr/lib64/python3.5/site-packages/cffi/cparser.py", line 299, in parse
    self._internal_parse(csource)
  File "/usr/lib64/python3.5/site-packages/cffi/cparser.py", line 304, in _internal_parse
    ast, macros, csource = self._parse(csource)
  File "/usr/lib64/python3.5/site-packages/cffi/cparser.py", line 262, in _parse
    self.convert_pycparser_error(e, csource)
  File "/usr/lib64/python3.5/site-packages/cffi/cparser.py", line 291, in convert_pycparser_error
    raise api.CDefError(msg)
cffi.api.CDefError: parse error
: At end of input

我错过了什么吗？

我尝试了几个版本：ffi.cdef('float norm(float**)'). 喜欢ffi.cdef('float norm(Vec< Vec<float>>)')或ffi.cdef('float norm(float[][])') 但它也不起作用。

感谢您以后的回复。

4

0 回答 0