酸洗例程可通过 C API 访问? [英] Pickling routines accessible through the C API?

问题描述

我想从 C++ 代码中调用 Python 的酸洗例程(dumps 和 loads).它们是否在官方 API 中公开?我目前正在通过 c++ 中的 boost::python 调用这些方法，也许正在寻找一种更简单的方法.

I would like to call Python's pickling routines (dumps and loads) from within c++ code. Are they exposed in the official API? I am currently calling those via boost::python from c++, looking for a simpler way perhaps.

推荐答案

您可以通过 C API 调用任何 Python 代码:

You can call any Python code through the C API:

static PyObject *module = NULL;
PyObject *pickle;

if (module == NULL &&
    (module = PyImport_ImportModuleNoBlock("pickle")) == NULL)
    return NULL;

现在，你可以这样称呼它:

now, you can either call it like:

python-2.x

pickle = PyObject_CallMethodObjArgs(module,
                                    PyString_AS_STRING("dumps"),
                                    py_object_to_dump,
                                    NULL);

python-3.x

pickle = PyObject_CallMethodObjArgs(module,
                                    PyUnicode_FromString("dumps"),
                                    py_object_to_dump,
                                    NULL);

或喜欢:

picle = PyObject_CallMethod(module, "dumps", "O", py_object_to_dump);

然后进行错误检查和清理:

and then do the error checking and clean up:

if (pickle != NULL) { ... }
Py_XDECREF(pickle);

但在 pickle 的情况下，您可以只使用 cPickle 函数 直接.唯一的问题是 cPickle 模块(或 Python 3 中的 _pickle)被静态编译成 Python 二进制文件，或者需要单独加载.在这里使用 Python 导入机制更容易.

but in the case of pickle you can just use the cPickle functions directly. The only problem there is that the cPickle module (or _pickle in Python 3) is statically compiled into the Python binary, or needs to be loaded separately. Using the Python import mechanisms is simply easier here.

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