Detailed explanation of how Python calls C language functions

黄舟
Release: 2017-10-03 05:43:40
Original
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The following editor will bring you an example of how python calls c language functions. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look

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
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#include <stdio.h>

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


gcc -o hello.so --share -fPIC hello.c
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New python Script


touch test.py
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from ctypes import *

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


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