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使用C语言扩展Python3
使用C语言扩展Python3。
在Python3中正确调用C函数。
1. 文件demo.c
#include <Python.h> // c function static PyObject * demo_system(PyObject *self, PyObject *args) { const char *command; int sts; if (!PyArg_ParseTuple(args, "s", &command)) return NULL; sts = system(command); return PyLong_FromLong(sts); } static PyObject * demo_hello(PyObject *self, PyObject *args) { PyObject *name, *result; if (!PyArg_ParseTuple(args, "U:demo_hello", &name)) return NULL; result = PyUnicode_FromFormat("Hello, %S!", name); return result; } static PyObject * demo_chinese(PyObject *self, PyObject *args) { char *name; int age; if (!PyArg_ParseTuple(args, "si", &name, &age)) return NULL; // printf("%d\n", age); char total[10000]; memset(total, 0, sizeof(total)); strcat(total, "strcat() 函数用来连接字符串:"); strcat(total, "tset"); PyObject *result = Py_BuildValue("s", total); return result; } // method table static PyMethodDef DemoMethods[] = { {"system", // python method name demo_system, // matched c function name METH_VARARGS, /* a flag telling the interpreter the calling convention to be used for the C function. */ "I guess here is description." }, {"hello", demo_hello, METH_VARARGS, "I guess here is description." }, {"chinese", demo_chinese, METH_VARARGS, NULL }, {NULL, NULL, 0, NULL} /* Sentinel */ }; // The method table must be referenced in the module definition structure. static struct PyModuleDef demomodule = { PyModuleDef_HEAD_INIT, "demo", /* name of module */ NULL, /* module documentation, may be NULL */ -1, /* size of per-interpreter state of the module, or -1 if the module keeps state in global variables. */ DemoMethods }; // The initialization function must be named PyInit_name() PyMODINIT_FUNC PyInit_demo(void) { return PyModule_Create(&demomodule); }
2. hello.py
import demo print("---------------------------") status = demo.system("ls -l") print("---------------------------") hi = demo.hello("Sink") print(hi) print("---------------------------") hi = demo.chinese("Sink", 2014) print(hi) print("---------------------------")
3. setup.py
from distutils.core import setup, Extension module1 = Extension(‘demo‘, sources = [‘demo.c‘]) setup (name = ‘Demo hello‘, version = ‘1.0‘, description = ‘This is a demo package by Sink‘, ext_modules = [module1])
使用C语言扩展Python3
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