Python calls a shared library method instance developed by C language _python

In the HelloWorld project, a simple two-sum program was written, how to use Python to invoke it after compiling it into a shared library?

Use the LL command to list the shared libraries under the current directory, where the shared library name is libhelloworld.so.0.0.0

Copy Code code as follows:

ufo@ufo:~/helloworld/.libs$ LL
Total Dosage 32
Drwxr-xr-x 2 UFO UFO 4096 January 29 14:54./
Drwxr-xr-x 6 UFO UFO 4096 January 29 16:08. /
-rw-r--r--1 UFO UFO 3816 January 14:54 HELLOWORLD.O
-rw-r--r--1 UFO UFO 3956 January 14:54 libhelloworld.a
lrwxrwxrwx 1 UFO UFO 19 January 14:54 libhelloworld.la->. /libhelloworld.la
-rw-r--r--1 UFO UFO 983 January 14:54 Libhelloworld.lai
lrwxrwxrwx 1 UFO UFO 22 January 14:54 libhelloworld.so-> libhelloworld.so.0.0.0*
lrwxrwxrwx 1 UFO UFO 22 January 14:54 libhelloworld.so.0-> libhelloworld.so.0.0.0*
-rwxr-xr-x 1 UFO UFO 9038 January 14:54 libhelloworld.so.0.0.0*

Call into Python's command line mode for the two numeric addition programs implemented in C language;

Copy Code code as follows:

ufo@ufo:~/helloworld/.libs$ python
Python 2.7.4 (default, Sep 26 2013, 03:20:56)
[GCC 4.7.3] on linux2
Type ' help ', ' copyright ', ' credits ' or ' license ' for the more information.

Load the cTYPES class (this class is the method that invokes the C language dynamic library)

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>>> Import cTYPES

Open the dynamic library for the current directory

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>>> lib=ctypes.cdll.loadlibrary ("./libhelloworld.so.0.0.0")

Calling interfaces in a dynamic library

Copy Code code as follows:

>>> Lib.add (5,7)
12

The function of the addition of two parameters is as follows:

Copy Code code as follows:

ufo@ufo:~/helloworld$ Cat HELLOWORLD.C
#include <stdio.h>
#include <stdlib.h>

int add (int a, int b)
{
int C = a + B;
return C;
}

To compile the command line for a dynamic library:

Copy Code code as follows:

Gcc-shared-fpic-dpic Helloworld.c-o libhelloworld.so.0.0.0