Qfyilyi

I am attempting to read a binary file in Cython. Previously this was working in Python, but I am looking to speed up the process. This code below was written as a familiarisation and logic check before writing the complete module. Once this section is complete the code will be expanded to read in multiple 400 Mb files and process.

A function was created that opens the file, reads in a number of data point and returns them to an array.

from libc.stdlib cimport malloc, free 

from libc.stdio cimport fopen, fclose, FILE, fscanf, fread



def readin_binary(filename, int number_of_points):

    """

    Test reading in a file and returning data

    """

    header_bytes = <unsigned char*>malloc(number_of_points)

    filename_byte_string = filename.encode("UTF-8")

    cdef FILE *in_binary_file

    in_binary_file = fopen(filename_byte_string, 'rb')

    if in_binary_file is NULL:

        print("file not found")

    else:                       

        print("Read file {}".format(filename))

        fread(&header_bytes, 1, number_of_points, in_binary_file)

    fclose(in_binary_file)

    return header_bytes    



print(hDVS.readin_binary(filename, 10))

The code compiles.

When the code is run the following error occurs:

Python has stopped working error

I've been playing with this for a few days now. I think there is a simple error but I can not see it. Any ideas?