关于C++调用python的代码示例

#include 
#include 

using namespace std;

class Py_Operate
{
public:
    PyObject *pModule;
    PyObject *pDict;
    PyObject *pFunc;
    PyObject *pArgs;
    PyByteArrayObject *pImgArr;
    
public:
    Py_Operate() : pModule(0), pDict(0), pFunc(0),pImgArr(0)
    {
    }
    ~Py_Operate()
    {
        Py_DECREF(pArgs);
        Py_Finalize();
    }
    int PyInit();
};

#include "cpp_python.hpp"

int Py_Operate::PyInit()
{
    Py_Initialize();
    if (!Py_IsInitialized())
    {
        cout << "Py init :fail" << endl;
        return 1;
    }
    //导入python数组
    // _import_array();

    //添加当前路径，直接执行字符串的命令
    PyRun_SimpleString("import sys");

    int i = PyRun_SimpleString("sys.path.append('./')");
    // printf("i=%dn", i);

    // 载入名为request_image的脚本
    pModule = Pyimport_importModule("request_image");
    if (!pModule)
    {
        cout << "pModule:fail" << endl;
        return 1;
    }
    cout << "pModule: " << pModule << endl;

    // Python模块对象的__dict__属性，得到模块名称空间下的字典对象
    pDict = PyModule_GetDict(pModule);
    if (!pDict)
    {
        cout << "pDict:fail" << endl;
        return 1;
    }
    cout << "pDict: " << pDict << endl;

    // 或者RequestImage函数指针RequestImage
    pFunc = PyDict_GetItemString(pDict, "RequestImage");
    if (!pFunc)
    {

        cout << "pFunc:fail" << endl;
        return 1;
    }
    cout << "pFunc: " << pFunc << endl;

    pArgs = PyTuple_New(1);
    if (!pArgs)
    {
        cout << "pArgs:fail" << endl;
        return 1;
    }
}

def RequestImage():
    
    # response  = requests.get(url="http://192.168.40.42:8080/snapshot?",params="topic=/cam")
    response = requests.get(url="http://192.168.40.42:8080/snapshot?",
                            params="topic=/cam&width=640&height=480")
    img = cv.imdecode(np.fromstring(response.content, np.uint8),
                        cv.COLOR_BGR2GRAY)
    
    img = cv.flip(img, 1)
    code_src = pyzbar.decode(img)
    try:
        wifi_data=code_src[0].data.decode('utf-8')
        return wifi_data
    except Exception:
        return ""

 m_py_object.PyInit();


//带参数
// PyTuple_SetItem(m_py_object.pArgs, 0, Py_BuildValue("i", 8));
// PyObject *pResult=PyObject_CallObject(m_py_object.pFunc,m_py_object.pArgs);

//不带参数调用
PyObject *pResult = PyObject_CallObject(m_py_object.pFunc, nullptr);
if (pResult != NULL)
{
   PyArg_Parse(pResult, "s", &p_wifi_data);//解析参数
}