Detailed explanation of how Python calls C language functions

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Although python is omnipotent, some special functions require C language to complete. In this way, you need to use python to call c code

Specific process:

C writes relevant functions and compiles them into a library

Then load these libraries in python and specify the calling function.

These functions can be char, int, float, and can also return pointers.

The following example:

Call the c function through python and return "hello,world string"

Create a new c language File hello.c

touch hello.c

#include <stdio.h>

char *get_str()
{
 return "hello,world"
}

Compile into library

gcc -o hello.so --share -fPIC hello.c

New python Script

touch test.py

from ctypes import *

dll = CDLL("./hello.so")
dll.get_str.restype = c_char_p
str = dll.get_str()
print(string_at(str, 11))

Execute python script

[feng@arch python_c]$ python test.py 
hello,world

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