Py_BuildValue()函数

C&＃43;&＃43;对应python数据类型 

PyObject_CallMethod(pClass, “class_method”, “O”, pInstance)
参数分别为 PyObject&＃xff08;类&＃xff09;&＃xff0c;string&＃xff08;类方法&＃xff09;&＃xff0c;string&＃xff08;O表示参数为PyObject&＃xff09; &＃xff0c;PyObject&＃xff08;类实例&＃xff09;

PyObject_CallFunction(pFun, “O”, pyores)
参数分别为 PyObject&＃xff08;函数&＃xff09;&＃xff0c;string&＃xff08;O表示参数为PyObject&＃xff09; &＃xff0c;PyObject&＃xff08;函数中使用的参数&＃xff09;

问题来了&＃xff0c;函数有多个参数怎么办&＃xff0c;参数怎么传递&＃xff1f;别担心&＃xff0c;有多少个我们就写多少个&＃xff1a;
PyObject_CallFunction(pFun, “OO…O”, PyObject 1,PyObject 2…PyObject n)
中间的O可替换成参数类型说明符中的任意一个&＃xff0c;比如字符串s&＃xff0c;int型变量i等等

创建一个元组
PyObject *pArgs &＃61; PyTuple_New(3);
PyTuple_SetItem(pArgs, 0, Py_BuildValue(“i”, 1));//0—序号 i表示创建int型变量
PyTuple_SetItem(pArgs, 1, Py_BuildValue(“i”, 2));
PyTuple_SetItem(pArgs, 2, Py_BuildValue(“i”, 3));

PyEval_CallObject(pFunc, pArgs); //调用函数&＃xff0c;pArgs元素个数与被调函数参数个数一致

PyObject *pDict &＃61; PyDict_New(); //创建字典类型变量
PyDict_SetItemString(pDict, “Name”, Py_BuildValue(“s”, “Zhangsan”)); //往字典类型变量中填充数据
PyDict_SetItemString(pDict, “Address”, Py_BuildValue(“s”, “BeiJing”));

将上述字典赋值给元组
PyObject *pArgs &＃61; PyTuple_New(1);
PyTuple_SetItem(pArgs, 0, pDict)

python返回给C&＃43;&＃43;的是PyObject类型&＃xff0c;如果我想在纯C&＃43;&＃43;程序里使用它怎么办&＃xff1a;&＃xff08;可以使用下面这个函数
char * PyString_AsString&＃xff08;PyObject*&＃xff09;

利用上面的几个基本参数传递方法&＃xff0c;已经可以创建灵活性较强的C&＃43;&＃43;/python程序

Py_BuildValue("")  NonePy_BuildValue("i", 123)  123Py_BuildValue("iii", 123, 456, 789)  (123, 456, 789)Py_BuildValue("s", "hello")  &＃39;hello&＃39;Py_BuildValue("ss", "hello", "world")  (&＃39;hello&＃39;, &＃39;world&＃39;)Py_BuildValue("s#", "hello", 4) &＃39;hell&＃39;Py_BuildValue("()")  ()Py_BuildValue("(i)", 123)  (123,)Py_BuildValue("(ii)", 123, 456) (123, 456)Py_BuildValue("(i,i)", 123, 456) (123, 456)Py_BuildValue("[i,i]", 123, 456) [123, 456] Py_BuildValue("{s:i,s:i}", "abc", 123, "def", 456) {&＃39;abc&＃39;: 123, &＃39;def&＃39;: 456}Py_BuildValue("((ii)(ii)) (ii)", 1, 2, 3, 4, 5, 6) (((1, 2), (3, 4)), (5, 6))

https://blog.csdn.net/yiyouxian/article/category/6324494