How to convert C language string to Python language string

In this article, Xiaobian introduces in detail "how to convert C language strings into Python language strings". The content is detailed, the steps are clear, and the details are handled properly. I hope this article "how to convert C language strings into Python language strings" can help you solve your doubts.

problem

How to convert a string in C to a Python byte or a string object?

Solution

The C string is represented by a pair of char * and int, and you need to decide whether the string is represented by a raw byte string or a Unicode string. Byte objects can be built using Py_BuildValue () as follows:

Char * s; / * Pointer to C string data * / int len; / * Length of data * / / * Make a bytes object * / PyObject * obj = Py_BuildValue ("y #", s, len)

If you want to create a Unicode string and you know that s points to UTF-8-encoded data, you can use the following ways:

PyObject * obj = Py_BuildValue ("s #", s, len)

If s uses other encodings, you can use PyUnicode_Decode () to build a string like this:

PyObject * obj = PyUnicode_Decode (s, len, "encoding", "errors"); / * Examples / * obj = PyUnicode_Decode (s, len, "latin-1", "strict"); obj = PyUnicode_Decode (s, len, "ascii", "ignore")

If you happen to have a wide string represented by wchar_t * len pairs, there are several options. First you can use Py_BuildValue ():

Wchar_t * w; / * Wide character string * / int len; / * Length * / PyObject * obj = Py_BuildValue ("u #", w, len)

Alternatively, you can use PyUnicode_FromWideChar ():

PyObject * obj = PyUnicode_FromWideChar (w, len)

For wide strings, there is no parsing of character data-- it is assumed to be a raw Unicode-encoded pointer that can be converted directly to Python.

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