Usage of an GObject inout parameter in python

[David Boesner <david boesner gmail com>]

Hi everyone,

I would like to know how to use an inout parameter, that is defined in an GObject method, in python.

The problem, that I am facing is, that python array, which I am passing to the GObject method is

not changed, even though @buffer is an inout paramter. Could anyone please tell me, if I misunderstood

the concept of inout parameters or give me an example, how I can use inout parameters in python?

buffer-manipulation.c

/**
 * buffer_manipulation_increment:
 * @buffer: (inout) (array length=buffer_size) (element-type guint8): The buffer to increment
 * @buffer_size: (inout): The size of the buffer
 *
 * Increment every element of the buffer by one
 */
void buffer_manipulation_increment(guint8** buffer, gsize* buffer_size) {

    int i = 0;
    for (i = 0; i < *buffer_size; i++)
        (*buffer)[i]++;

    for (i = 0; i < *buffer_size; i++)
        printf("buffer %i %u \n", i , (*buffer)[i]);
}

buffer-manipulation.py

#!/usr/bin/python

from gi.repository import Buffer
import numpy as np

b = Buffer.Manipulation()

print "# b.increment"
arr=np.array([1,2,3], int)
print arr
b.increment(arr)
print arr

Output:

# b.increment
[1 2 3]
buffer 0 2
buffer 1 3
buffer 2 4

[1 2 3]  <--------- NOT CHANGED

I added the files which I wrote as an attachment.

The bindings can be created by calling create-bindings.sh

run.sh sets the necessary variables and runs the

python script

Regards

David

Attachment: buffer-manipulation.py
Description: Text Data

Attachment: buffer-manipulation.c
Description: Text Data

Attachment: create-bindings.sh
Description: Bourne shell script

Attachment: buffer-manipulation.h
Description: Text Data

Attachment: run.sh
Description: Bourne shell script