After writing a simple program to add two values in a helloworld project and compiling it as a shared library, how do I call it using python?
Use the ll command to list the shared libraries in the current directory, where the shared library is named .0.0.0
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ufo@ufo:~/helloworld/.libs$ ll
Total usage 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 29 14:54
-rw-r--r-- 1 ufo ufo 3956 January 29 14:54
lrwxrwxrwx 1 ufo ufo 19 January 29 14:54 -> ... /
-rw-r--r-- 1 ufo ufo 983 January 29 14:54
lrwxrwxrwx 1 ufo ufo 22 January 29 14:54 -> .0.0.0*
lrwxrwxrwx 1 ufo ufo 22 January 29 14:54 .0 -> .0.0.0*
-rwxr-xr-x 1 ufo ufo 9038 January 29 14:54 .0.0.0*
Enter python's command line mode to make a call to a C implementation of a program that adds two values;
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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 to call the C dynamic library)
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>>> import ctypes
Open the dynamic library in the current directory
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>>> lib=("./.0.0.0")
Calling interfaces in dynamic libraries
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>>> (5,7)
12
The function for adding two arguments is as follows.
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ufo@ufo:~/helloworld$ cat
#include <>
#include <>
int add(int a, int b)
{
int c = a + b;
return c;
}
Command line for compiling dynamic libraries:
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gcc -shared -fPIC -DPIC -o .0.0.0