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Python embedded C/C++ lower level embedded function is what, for this problem, this article describes the corresponding analysis and solution in detail, hoping to help more want to solve this problem of small partners to find a simpler and easier way.

If you need Python scripts to pass parameters in C programs, or if you want to get the return values of Python scripts, you can read the following articles to get a better understanding of Python embedding in C/C++(lower level embedding). Since Python has its own data types, it is necessary to use special APIs to operate on corresponding data types in C programs. There are several common functions.

Number and string processing

The Python/C API provides the Py_BuildValue() function to convert numbers and strings into the corresponding data types in Python. The prototype function is shown below.

PyObject* Py_BuildValue( const char *format, ...)

The parameters have the following meanings.

format: Format a string

The remaining arguments in the Py_BuildValue() function are integers, floating-point types, or strings in C to be converted. Pointer whose return value is of type PyObject. In C, all Python types are declared as PyObject.

list operations

PyList_New() is provided in the Python/C API to create a new Python list. The PyList_New() function returns the list created. The prototype function is shown below.

PyObject* PyList_New( Py_ssize_t len)

The parameters have the following meanings.

len: Length of the list created. After the list is created, you can add items to the list using the PyList_SetItem() function. The prototype function is shown below.

int PyList_SetItem( PyObject *list, Py_ssize_t index,

PyObject *item)

The parameters have the following meanings.

list: List of items to add.

index: The index of the location of the added item.

item: Value of the item being added.

You can also use the PyList_GetItem() function in the Python/C API to get the value of an item in a list. The PyList_GetItem() function returns the value of the item. The prototype function is shown below.

PyObject* PyList_GetItem( PyObject *list, Py_ssize_t index)

The parameters have the following meanings.

list: List of actions to be performed.

index: positional index of the item.

In practice, Python embeds C/C++(lower-level embeddings), and the Python/C API provides functions corresponding to list operations in Python. For example, the append method for a list corresponds to the PyList_Append() function. The sort method for lists corresponds to the PyList_Sort() function. The reverse method of a list corresponds to the PyList_Reverse() function. The function prototypes are shown below.

int PyList_Append( PyObject *list, PyObject *item)

int PyList_Sort( PyObject *list)

int PyList_Reverse( PyObject *list)

For the PyList_Append() function, its parameters mean the following:

list: List of actions to be performed.

Item: The item to participate in.

For PyList_Sort() and PyList_Reverse() functions, the arguments have the same meaning.

list: List of actions to be taken.

About Python embedded C/C++ low-level embedded functions needed to be used when the answer to what the problem is shared here, I hope the above content can be of some help to everyone, if you still have a lot of doubts not solved, you can pay attention to the industry information channel to learn more related knowledge.

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