Python 2.5 (r25:51908, Dec 18 2006, 21:43:53)
[GCC 3.2 20020903 (Red Hat Linux 8.0 3.2-7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> fp=open('test.flag','rb')
>>> c=fp.read(1)
>>> c&3
Traceback (most recent call last):
File "", line 1, in 
TypeError: unsupported operand type(s) for &: 'str' and 'int'
>>> c
'\x14'
>>> print c

>>> from ctypes import *
>>> a = c_char(c)
>>> a
c_char('\x14')
>>> a&3
Traceback (most recent call last):
File "", line 1, in 
TypeError: unsupported operand type(s) for &: 'c_char' and 'int'
>>> i=c_byte(c)
Traceback (most recent call last):
File "", line 1, in 
TypeError: int expected instead of str instance
>>> n=c_byte(a)
Traceback (most recent call last):
File "", line 1, in 
TypeError: int expected instead of c_char instance
>>> n=c_int(a)
Traceback (most recent call last):
File "", line 1, in 
TypeError: int expected instead of c_char instance
>>>

¿ÉÒÔÊÔÒ»ÊÔarray»òÕßstructÄ£¿é

2006/12/19, brightman <fenyon在126.com>:
>
> Python 2.5 (r25:51908, Dec 18 2006, 21:43:53)
> [GCC 3.2 20020903 (Red Hat Linux 8.0 3.2-7)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> fp=open('test.flag','rb')
> >>> c=fp.read(1)
> >>> c&3
> Traceback (most recent call last):
> File "", line 1, in 
> TypeError: unsupported operand type(s) for &: 'str' and 'int'
> >>> c
> '\x14'
> >>> print c
> 
> >>> from ctypes import *
> >>> a = c_char(c)
> >>> a
> c_char('\x14')
> >>> a&3
> Traceback (most recent call last):
> File "", line 1, in 
> TypeError: unsupported operand type(s) for &: 'c_char' and 'int'
> >>> i=c_byte(c)
> Traceback (most recent call last):
> File "", line 1, in 
> TypeError: int expected instead of str instance
> >>> n=c_byte(a)
> Traceback (most recent call last):
> File "", line 1, in 
> TypeError: int expected instead of c_char instance
> >>> n=c_int(a)
> Traceback (most recent call last):
> File "", line 1, in 
> TypeError: int expected instead of c_char instance
> >>>
>
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On 12/19/06, brightman <fenyon在126.com> wrote:
> Python 2.5 (r25:51908, Dec 18 2006, 21:43:53)
> [GCC 3.2 20020903 (Red Hat Linux 8.0 3.2-7)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> fp=open('test.flag','rb')
> >>> c=fp.read(1)
> >>> c&3
> Traceback (most recent call last):
> File "", line 1, in 
> TypeError: unsupported operand type(s) for &: 'str' and 'int'
> >>> c
> '\x14'

可以使用ord(c)将一个字符转为int呀。


-- 
I like python!
UliPad <>: http://wiki.woodpecker.org.cn/moin/UliPad
My Blog: http://www.donews.net/limodou

you may get the ascii code first, then do the bitwise operations.
following code for your information

>>> s = 'test'
>>> ord(s[0]) & 7
4
>>> ord(s[1]) & 7
5
>>> ord(s[2]) & 7
3
>>> ord(s[3]) & 7
4
>>>

-- 
Best Regards,
Leo Jay