从python返回数组到C ++ [英] Return an array from python to C++

问题描述

我正在编写一个c ++代码来调用python函数，并且从python函数返回的数组将存储在c ++中的数组中.我可以在c ++中调用python函数，但是我只能从Python返回一个值到C ++，而我想返回的是一个数组.下面是我的C ++代码:

I'm writing a c++ code to call a python function and the returned array from the python function will be store in an array in c++. I am able to call the python function in c++ but I am able to return only one value from Python to C++ and what I want to return is an array. Below is my C++ code:

int main(int argc, char *argv[])
{
int i;
PyObject *pName, *pModule, *pDict, *pFunc, *pArgs, *pValue;

if (argc < 3) 
{
    printf("Usage: exe_name python_source function_name\n");
    return 1;
}

// Initialize the Python Interpreter
Py_Initialize();

// Build the name object
pName = PyString_FromString(argv[1]);

// Load the module object
pModule = PyImport_Import(pName);

// pDict is a borrowed reference 
pDict = PyModule_GetDict(pModule);

// pFunc is also a borrowed reference 
pFunc = PyDict_GetItemString(pDict, argv[2]);

    pValue = PyObject_CallObject(pFunc, NULL);
    if (pValue != NULL) 
    {
        printf("Return of call : %d\n", PyInt_AsLong(pValue));
        PyErr_Print();
        Py_DECREF(pValue);
    }
    else 
    {
        PyErr_Print();
    }

在这里，pValue应该采用的值是一个数组，但仅包含单个元素时就能够成功执行.

Here, the value which pValue should take is an array but am able to successfully execute when it takes a single element only.

我无法理解如何将数组从python传递给C ++.

I am not able to understand how will an array be passed from python to C++.

推荐答案

Python list 是1个对象.您可以从python返回一个列表，并使用 PyList_Check 检查是否在C ++中获得了该列表吗?然后查看使用 PyList_Size 多长时间，然后使用 PyList_GetItem 钓鱼.

A Python list is 1 object. Can you return a list from python and check that you got it in C++ with PyList_Check? Then see how long it is with PyList_Size and fish out the items with PyList_GetItem.

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