Using a Python array, I can initialize a 32,487,834 integer array (found in a file HR.DAT) using the following (not perfectly Pythonic, of course) commands:
F = open('HR.DAT','rb')
HR = array('I',F.read())
F.close()
I need to do the same in ctypes. So far the best I have is:
HR = c_int * 32487834
I'm not sure how to initilize each element of the array using HR.DAT. Any thoughts?
Thanks,
Mike
File objects have a 'readinto(..)' method that can be used to fill objects that support the buffer interface.
So, something like this should work:
f = open('hr.dat', 'rb')
array = (c_int * 32487834)()
f.readinto(array)
Try something like this to convert array to ctypes array
>>> from array import array
>>> a = array("I")
>>> a.extend([1,2,3])
>>> from ctypes import c_int
>>> ca = (c_int*len(a))(*a)
>>> print ca[0], ca[1], ca[2]
1 2 3
*a returns a tuple of array elements, which needs to load the whole thing into memory (if a was an iterator) and then convert to Python types (only to convert back into ctypes).