C调用Python脚本文件里的函数

叁歲伎倆 2022-04-13 04:58 208阅读 0赞

# [C调用Python脚本文件里的函数][C_Python][\[复制链接\]][C_Python] #

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           <em>发表于 2009-10-3 08:40:25</em> 
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              <td>#Python脚本，存为pytest.py<br> def add(a,b):<br> &nbsp; &nbsp; print "in python function add"<br> &nbsp; &nbsp; print "a = " + str(a)<br> &nbsp; &nbsp; print "b = " + str(b)<br> &nbsp; &nbsp; print "ret = " + str(a+b)<br> &nbsp; &nbsp; return a + b<br> <br> // C代码调，用上面的add函数<br> #include &lt;stdio.h&gt;<br> #include &lt;stdlib.h&gt;<br> #include "C:/Python26/include/python.h"<br> #pragma comment(lib, "C:\\Python26\\libs\\python26.lib")<br> <br> int main(int argc, char** argv)<br> { <br> &nbsp; &nbsp; // 初始化Python<br> &nbsp; &nbsp; //在使用Python系统前，必须使用Py_Initialize对其<br> &nbsp; &nbsp; //进行初始化。它会载入Python的内建模块并添加系统路<br> &nbsp; &nbsp; //径到模块搜索路径中。这个函数没有返回值，检查系统<br> &nbsp; &nbsp; //是否初始化成功需要使用Py_IsInitialized。<br> <br> &nbsp; &nbsp; PyObject *pName, *pModule, *pDict, *pFunc, *pArgs, *pRetVal;<br> <br> &nbsp; &nbsp; Py_Initialize();<br> &nbsp; &nbsp; // 检查初始化是否成功<br> &nbsp; &nbsp; if ( !Py_IsInitialized() )<br> &nbsp; &nbsp; { <br> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;return -1;<br> &nbsp; &nbsp; }<br> <br> &nbsp; &nbsp; // 载入名为pytest的脚本(注意：不是pytest.py)<br> &nbsp; &nbsp; pName = PyString_FromString("pytest");<br> &nbsp; &nbsp; pModule = PyImport_Import(pName);<br> &nbsp; &nbsp; if ( !pModule )<br> &nbsp; &nbsp; { <br> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;printf("can't find pytest.py");<br> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;getchar();<br> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;return -1;<br> &nbsp; &nbsp; }<br> &nbsp; &nbsp; pDict = PyModule_GetDict(pModule);<br> &nbsp; &nbsp; if ( !pDict )<br> &nbsp; &nbsp; { <br> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;return -1;<br> &nbsp; &nbsp; }<br> <br> &nbsp; &nbsp; // 找出函数名为add的函数<br> &nbsp; &nbsp; pFunc = PyDict_GetItemString(pDict, "add");<br> &nbsp; &nbsp; if ( !pFunc || !PyCallable_Check(pFunc) )<br> &nbsp; &nbsp; { <br> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;printf("can't find function [add]");<br> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;getchar();<br> &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;return -1;<br> &nbsp; &nbsp; }<br> <br> &nbsp; &nbsp; // 参数进栈<br> &nbsp; &nbsp; pArgs = PyTuple_New(2);<br> <br> &nbsp; &nbsp; // PyObject* Py_BuildValue(char *format, ...)<br> &nbsp; &nbsp; // 把C++的变量转换成一个Python对象。当需要从<br> &nbsp; &nbsp; // C++传递变量到Python时，就会使用这个函数。此函数<br> &nbsp; &nbsp; // 有点类似C的printf，但格式不同。常用的格式有<br> &nbsp; &nbsp; // s 表示字符串，<br> &nbsp; &nbsp; // i 表示整型变量，<br> &nbsp; &nbsp; // f 表示浮点数，<br> &nbsp; &nbsp; // O 表示一个Python对象。<br> <br> &nbsp; &nbsp; PyTuple_SetItem(pArgs, 0, Py_BuildValue("l",3));<br> &nbsp; &nbsp; PyTuple_SetItem(pArgs, 1, Py_BuildValue("l",4));<br> <br> &nbsp; &nbsp; // 调用Python函数<br> &nbsp; &nbsp; pRetVal = PyObject_CallObject(pFunc, pArgs);<br> &nbsp; &nbsp; printf("function return value : %ld\r\n", PyInt_AsLong(pRetVal));<br> <br> &nbsp; &nbsp; Py_DECREF(pName);<br> &nbsp; &nbsp; Py_DECREF(pArgs);<br> &nbsp; &nbsp; Py_DECREF(pModule);<br> &nbsp; &nbsp; Py_DECREF(pRetVal);<br> <br> &nbsp; &nbsp; // 关闭Python<br> &nbsp; &nbsp; Py_Finalize();<br> &nbsp; &nbsp; return 0;<br> }</td> 
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