[liblouis-liblouisxml] Re: ctypes and bad trailing pad byte
- From: Christian Egli <christian.egli@xxxxxxxx>
- To: liblouis-liblouisxml <liblouis-liblouisxml@xxxxxxxxxxxxx>
- Date: Wed, 03 Feb 2010 12:11:29 +0100
Christian Egli <christian.egli@xxxxxxxx> writes:
> interpreter crashes with a segmentation fault. I instrumented the Python
> interface a bit to get some more debugging information (see attached
> file).
Naturally I forgot to attach the file.
from ctypes import *
import struct
import atexit
try:
# Native win32
_loader = windll
except NameError:
# Unix/Cygwin
_loader = cdll
liblouis = _loader["liblouis.so.2"]
atexit.register(liblouis.lou_free)
liblouis.lou_version.restype = c_char_p
liblouis.lou_translateString.argtypes = (
c_char_p, c_wchar_p, POINTER(c_int), c_wchar_p,
POINTER(c_int), POINTER(c_char), POINTER(c_char), c_int)
def version():
"""Obtain version information for liblouis.
@return: The version of liblouis, plus other information, such as
the release date and perhaps notable changes.
@rtype: str
"""
return liblouis.lou_version()
def translateString(tran_tables, inbuf, typeform = None, mode = 0):
"""Translate a string of characters.
@param tran_tables: A list of translation tables.
The first table in the list must be a full pathname, unless the tables
are in the current directory.
@type tran_tables: list of str
@param inbuf: The string to translate.
@type inbuf: unicode
@param typeform: A list of typeform constants indicating the typeform for
each position in inbuf,
C{None} for no typeform information.
@type typeform: list of int
@param mode: The translation mode; add multiple values for a combined mode.
@type mode: int
@return: The translated string.
@rtype: unicode
@raise RuntimeError: If a complete translation could not be done.
@see: lou_translateString in the liblouis documentation
"""
tablesString = ",".join([str(x) for x in tran_tables])
inbuf = unicode(inbuf)
if typeform:
typeform = struct.pack('B'*len(typeform), *typeform)
else:
typeform = None
inlen = c_int(len(inbuf))
outlen = c_int(inlen.value*2)
outbuf = create_unicode_buffer(outlen.value)
print locals()
if not liblouis.lou_translateString(tablesString, inbuf, byref(inlen),
outbuf, byref(outlen), typeform,
None, mode):
raise RuntimeError("can't translate: tables %s, inbuf %s, typeform %s,
mode %s"%(tran_tables, inbuf, typeform, mode))
print outbuf.value
return outbuf.value
#{ Typeforms
plain_text = 0
italic = 1
underline = 2
bold = 4
computer_braille = 8
if __name__ == '__main__':
# Just some common tests.
print version()
string = u'USA Today'
typeform = len(string)*[italic]
result = translateString(['de-ch-g2.ctb'], string, typeform=typeform)
print "result: %s" % result
--
Christian Egli
Swiss Library for the Blind, Visually Impaired and Print Disabled
Grubenstrasse 12, CH-8045 Zürich, Switzerland
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