python之C扩展二

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1.c代码

/*************************************************************************    > File Name: python_test.c    > Author:     > Mail:     > Created Time: Thu 03 Dec 2015 10:45:04 PM PST ************************************************************************/#include <python2.7/Python.h> //包含python的头文件  /*1 c/cpp中的函数  */int my_c_function(const char *arg) {      int n = system(arg);      return n;  }  // 2 python 包装  static PyObject * wrap_my_c_fun(PyObject *self, PyObject *args) {      const char * command;      int n;      if (!PyArg_ParseTuple(args, "s",&command))//这句是把python的变量args转换成c的变量command      return NULL;      n = my_c_function(command);//调用c的函数        return Py_BuildValue("i",n);//把c的返回值n转换成python的对象  }  // 3 方法列表  static PyMethodDef MyCppMethods[] = {  //MyCppFun1是python中注册的函数名，wrap_my_c_fun是函数指针      { "MyCppFun1", wrap_my_c_fun, METH_VARARGS, "Execute a shellcommand."  },      { NULL, NULL, 0, NULL  }  };  // 4 模块初始化方法  PyMODINIT_FUNC initMyCppModule(void) {          //初始模块，把MyCppMethods初始到MyCppModule中      PyObject *m = Py_InitModule("MyCppModule", MyCppMethods);      if (m == NULL)          return;  }

2.python代码 setup.py

#!/usr/bin env pythonfrom distutils.core import setup, ExtensionMOD = 'MyCppModule'setup(name=MOD,version = '1.0', ext_modules=[Extension(MOD,sources=['python_test.c'])])

3.编译

kjlr@kjlr-virtual-machine:~/python_test$ python setup.py build

running buildrunning build_extbuilding 'MyCppModule' extensionx86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c python_test.c -o build/temp.linux-x86_64-2.7/python_test.ocreating build/lib.linux-x86_64-2.7x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -D_FORTIFY_SOURCE=2 -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security build/temp.linux-x86_64-2.7/python_test.o -o build/lib.linux-x86_64-2.7/MyCppModule.so

4.连接至python

kjlr@kjlr-virtual-machine:~/python_test$ sudo python setup.py install

running installrunning buildrunning build_extrunning install_libcopying build/lib.linux-x86_64-2.7/MyCppModule.so -> /usr/local/lib/python2.7/dist-packagesrunning install_egg_infoWriting /usr/local/lib/python2.7/dist-packages/MyCppModule-1.0.egg-info

5.测试代码 test1.py

#!/usr/bin/env pythonimport MyCppModulea = "ls"MyCppModule.MyCppFun1(a)

测试结果（python运行ls命令）：kjlr@kjlr-virtual-machine:~/python_test$ python test1.py  build   python_test.c  setup.py    test1.py

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