Python calls the C language to develop a shared library method instance

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

Use the LL command to list the shared library under the current directory, where the shared library is named libhelloworld.so.0.0.0
Copy the 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*

Enter the command-line mode of Python for the C-language implementation of the two value added program of the call;
Copy CodeThe code is 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 more information.

Load the cTYPES class (this class is the method that calls the C-language dynamic library)
Copy CodeThe code is as follows:

>>> Import cTYPES

Open a dynamic library of the current directory
Copy CodeThe code is as follows:

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

Calling interfaces in a dynamic library
Copy CodeThe code is as follows:

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

The function of adding two parameters is as follows:
Copy CodeThe code is as follows:

ufo@ufo:~/helloworld$ Cat HELLOWORLD.C
#include
#include

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

Compile the command line for the dynamic library:
Copy code code as follows:

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

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