Python ctypes program works on 3.2 but incompatiable on 3.4 -

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i have program tokenizes thai text calling libtahi c library. programs works ok python 3.2 fails python3.4. idea why fails on 3.4?

please find below program code , outputs both version of python:

#!/usr/bin/python3 # apt-get install libthai0 libthai-doc libthai-dev libthai-data ctypes import * ctypes.util import find_library  thai_library = find_library('thai') if not thai_library:     raise oserror('cannot find libthai in system')  thai = cdll.loadlibrary(thai_library)  thai.th_wbrk_line.restype = c_int thai.th_wbrk_line.argtypes = [c_wchar_p,c_wchar_p,c_size_t,c_wchar_p]  def whitespace(ain):     # expects bytes     ain=ain.decode('utf8')     aout=whitespace_string(ain)     return aout.encode('utf8')  def whitespace_string(ain):     # expects string     # ain='แล้วพบกันใหม่'     aout=' '*(2*len(ain)+1)      # assume maximum length set of 1 character + white space     adelim=' '     asize=len(aout)     res=thai.th_wbrk_line(ain,aout,asize,adelim)     result=aout[:res]     return result  """ แล้วพบกันใหม่ means 'see later.'  , compound 3 words:  แล้ว พบกัน ใหม่ """   if __name__ == "__main__":      ain='แล้วพบกันใหม่'     aout=whitespace_string(ain)     print(ain,'=>',aout)     aout=whitespace(ain.encode('utf8'))     print(aout.decode('utf8'))

the outputs are: python3.2 tokenization happens:

python3.2 thai_libthai.py  แล้วพบกันใหม่ => แล้ว พบ กัน ใหม่ แล้ว พบ กัน ใหม่

with python3.4 result string blank:

python3.4 thai_libthai.py  แล้วพบกันใหม่ =>

using aout = (c_wchar * (2 * len(ain) + 1))() makes code work on both python 3.2 , 3.4. thank eryksun!


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