我嘗試透過C語言寫一個Python的模組，但是我的C程式本身又依賴一個第三方的函式庫（libwiringPi.so），當我在Python原始程式中import我產生的函式庫時，會提示函數未定義，這些函數都是那個第三方函式庫裡的，我應該怎麼編譯才能讓我編譯出的模組可以動態連結那個函式庫？

我也嘗試過使用gcc手動編譯動態連結函式庫，然後用ctyes，但是報一樣的錯誤；產生模組的C程式碼和setup.py程式碼都是基於Python原始碼包中的demo程式。

我的C程式碼

/* Example of embedding Python in another program */ #include "python2.7/Python.h" #include  void initdht11(void); /* Forward */ int main(int argc, char **argv) { /* Initialize the Python interpreter. Required. */ Py_Initialize(); /* Add a static module */ initdht11(); /* Exit, cleaning up the interpreter */ Py_Exit(0); return 0; } /* A static module */ /* 'self' is not used */ static PyObject * dht11_foo(PyObject *self, PyObject* args) { wiringPiSetup(); return PyInt_FromLong(42L); } static PyMethodDef dht11_methods[] = { {"foo", dht11_foo, METH_NOARGS, "Return the meaning of everything."}, {NULL, NULL} /* sentinel */ }; void initdht11(void) { PyImport_AddModule("dht11"); Py_InitModule("dht11", dht11_methods); }

setup.py

from distutils.core import setup, Extension dht11module = Extension('dht11', library_dirs = ['/usr/lib'], include_dirs = ['/usr/include'], sources = ['math.c']) setup (name = 'dht11', version = '1.0', description = 'This is a demo package', author = 'Martin v. Loewis', author_email = 'martin@v.loewis.de', url = 'https://docs.python.org/extending/building', long_description = ''' This is really just a demo package. ''', ext_modules = [dht11module])

錯誤訊息

Traceback (most recent call last): File "test.py", line 1, in  import dht11 ImportError: /usr/local/lib/python2.7/dist-packages/dht11.so: undefined symbol: wiringPiSetup