[英]pack and unpack at the right format in python
I'm looking to unpack from a buffer a string and its length. 我正在寻找从缓冲区解包一个字符串及其长度。
For example to obtain (4, 'Gégé')
from this buffer : 例如,要从此缓冲区获取
(4, 'Gégé')
:
b'\\x00\\x04G\\xE9g\\xe9'
Does someone know how to do ? 有人知道该怎么做吗?
The length data looks like a big-endian unsigned 16 bit integer, and the string data looks like it's using the Latin1 encoding. 长度数据看起来像一个大端无符号16位整数,字符串数据看起来像是使用Latin1编码。 If that's correct, you can extract it like this:
如果正确的话,您可以像这样提取它:
from struct import unpack
def extract(buff):
return unpack(b'>H', buff[:2])[0], buff[2:].decode('latin1')
buff = b'\x00\x04G\xE9g\xe9'
print(extract(buff))
output 产量
(4, 'Gégé')
Another possibility for the encoding is the old Windows code page 1252 , which can be decoded using .decode('cp1252')
. 编码的另一种可能性是旧的Windows代码页1252 ,可以使用
.decode('cp1252')
对其进行解码。
The above code works in both Python 2 & Python 3. But in Python 3 there's an easier way: we don't need struct.unpack
, we can use the int.from_bytes
method. 上面的代码在Python 2和Python 3中都适用。但是在Python 3中,有一个更简单的方法:我们不需要
struct.unpack
,我们可以使用int.from_bytes
方法。
def extract(buff):
return int.from_bytes(buff[:2], 'big'), buff[2:].decode('latin1')
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