Tensorflow模型移植Arm之一：C与Python互相调用

一、C调用Python

1.新建一个Python文件，名称为py_multipy.py：

 #import numpy as np
 def multiply(a=1,b=2):
     print('Function of python called!')
     print('a:',a)
     print('b:',b)
     print('a*b:',a*b)
     #print('numpy a*b:',np.multiply(a,b))
     

2.新建一个C调用文件，名称为call_python.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <Python.h>

 int main()
 {
     Py_Initialize();

     if(!Py_IsInitialized())
     {
         printf("Python init failed!\n");
         return -;
     }

     PyRun_SimpleString("import sys");
     PyRun_SimpleString("sys.path.append('./')");

     PyObject *pDict = NULL;
     PyObject *pModule = NULL;
     PyObject *pName = NULL;
     PyObject *pFunc = NULL;
     PyObject *pArgs = NULL;

     pName = PyString_FromString("py_add");
     pModule = PyImport_Import(pName);
     if (!pModule)
     {
         printf("Load py_add.py failed!\n");
         getchar();
         return -;
     }

     pDict = PyModule_GetDict(pModule);
     if(!pDict)
     {
         printf("Can't find dict in py_add!\n");
         return -;
     }

     pFunc = PyDict_GetItemString(pDict,"add");
     if(!pFunc || !PyCallable_Check(pFunc))
     {
         printf("Can't find function!\n");
         getchar();
         return -;
     }

     pArgs = PyTuple_New();

     PyTuple_SetItem(pArgs,,Py_BuildValue("i",));
     PyTuple_SetItem(pArgs,,Py_BuildValue("i",));

     PyObject_CallObject(pFunc,pArgs);

     if(pName)
     {
         Py_DECREF(pName);
     }

     if(pArgs)
     {
         Py_DECREF(pArgs);
     }

     if(pModule)
     {
         Py_DECREF(pModule);
     }

     Py_Finalize();
     return ;

 }

3.编译C文件

gcc -I/usr/include/python2.7/ call_python.c -o call_python -L/usr/lib/ -lpython2.7

在当前目录下生成可执行文件call_python

4.执行新生成的文件：./call_python

显示结果如下：

Function of python called!

('a:',111)

('b:',222)

('a*b:',333)

二、Python调用C

1.新建一个pcallc.c

 #include <stdio.h>
 #include <pcallc.h>

 int add(int a,int b)
 {
     int c= ;
     c = a+b;
     printf("add c:",c);
     return c;
 }

2.新建一个pcallc.h

 #ifndef PCALLC_H
 #define PCALLC_H

 int add();

 #endif

3.生成动态库：pcallc.so

gcc -o pcallc.so -shared -fPIC pcallc.c

4.新建pcallc.py

 #-*- coding:utf-8 -*-

 import ctypes

 loadso = ctypes.cdll.LoadLibrary
 lib= loadso("./pcallc.so")
 lib.add(1,2)

 print("***finish***")

5.运行pcallc.py

python pcallc.py

add c:3

finish!