l*****r
发帖数: 15615 | 1 in a communication task, the python script received the data buff as a list
of bytes.
since python tool was used to do the communication with embedded software,
which were written in C/C++;
so the message were definded in c as type of structure, for example
struct
{
unsigned long variable1;
unsigned char variable2;
unsigned char variable3[4];
...
}MessageType
in stead of writing a function in python to decode the message buffer byte
by byte: forming four bytes into unsigned long/int; and etc.
is there a better approach for this? | j*a
发帖数: 14423 | 2 http://docs.python.org/py3k/library/index.html
6.3. struct — Interpret bytes as packed binary data
list
【在 l*****r 的大作中提到】
: in a communication task, the python script received the data buff as a list
: of bytes.
: since python tool was used to do the communication with embedded software,
: which were written in C/C++;
: so the message were definded in c as type of structure, for example
: struct
: {
: unsigned long variable1;
: unsigned char variable2;
: unsigned char variable3[4];
| l*****r
发帖数: 15615 | 3 how does that gonna help?
I already have the data in bytes in a list.
let us say the data is like
abc = [ ,,,,,0x54, 0xA1, 0xB2, 0x3F]
and the last 4 bytes of the data is a number as: 0x3FB2A154, since they were
in little Endian. how does struct can help in this case.
Thanks for your reply.
【在 j*a 的大作中提到】
: http://docs.python.org/py3k/library/index.html
: 6.3. struct — Interpret bytes as packed binary data
:
: list
| j*a
发帖数: 14423 | 4 http://docs.python.org/py3k/library/struct.html#examples
were
【在 l*****r 的大作中提到】
: how does that gonna help?
: I already have the data in bytes in a list.
: let us say the data is like
: abc = [ ,,,,,0x54, 0xA1, 0xB2, 0x3F]
: and the last 4 bytes of the data is a number as: 0x3FB2A154, since they were
: in little Endian. how does struct can help in this case.
: Thanks for your reply.
| l*****r
发帖数: 15615 | 5 apperantly, I am not that smart as you. and don't see how examples helps me.
【在 j*a 的大作中提到】
: http://docs.python.org/py3k/library/struct.html#examples
:
: were
| l*****r
发帖数: 15615 | 6 well, you could explain better just saying somthing like
pack the list into binary then unpack them;
but throwing out web links, didn't really help.
and you have more WB than me, so I guess you will be fine if I don't pay you
any.
【在 j*a 的大作中提到】
: http://docs.python.org/py3k/library/struct.html#examples
:
: were
| j*a
发帖数: 14423 | 7 that's cool
you
【在 l*****r 的大作中提到】
: well, you could explain better just saying somthing like
: pack the list into binary then unpack them;
: but throwing out web links, didn't really help.
: and you have more WB than me, so I guess you will be fine if I don't pay you
: any.
|
|
