python - 如何从 Python 的 CFFI 访问 errno？

Question

我正在使用 cffi 包装一个使用 errno 返回错误值的库。

如何从 cffi 读取 errno？

Answer 1

参见文档 https://cffi.readthedocs.org/en/release-0.6/

ffi.errno 是 cffi.FFI 对象的一个​​属性。

例如

from cffi import FFI    
ffi = FFI()
# error happens
print ffi.errno

ffi.errno: the value of errno received from the most recent C call in this thread, and passed to the following C call, is available via reads and writes of the property ffi.errno. On Windows we also save and restore the GetLastError() value, but to access it you need to declare and call the GetLastError() function as usual.