How to print c_type byte array as set of hexadecimal values in python?

Question

I have data structure defined as follows:

class Factory_Params_Get_Command(Structure):
_pack_ = 1
_fields_ = [("SN",c_byte * 32),
            ("Voltage",c_byte),
            ("Reserved",c_byte * 30)]
# Print the fields
def __str__(self):
    return "Serial Number: %s"  % (list(self.SN))

This prints the serial number like:

[0, 32, 58, 73.....]

I would like to print the serial number as set of hexadecimal values, where each byte is represented by 2 hex numbers, and , if possible , without commas and without spaces. Something like this:

03C8A0D6.....

Would appreciate your help

Have you tried hex(number) function?

rafaelc
– rafaelc

2015-05-04 12:43:02 +00:00
Commented May 4, 2015 at 12:43 — rafaelc
– rafaelc, Commented May 4, 2015 at 12:43

ldx.a.ldy.c · Accepted Answer · 2015-05-04 12:52:07Z

1

Possibly something like:

hexstring = ''.join('%02X' % b for b in self.SN)

That applies the formatting string %02X to every byte in the array, and then concatenates everything into a single string. For example:

>>> import ctypes
>>> sn = (ctypes.c_byte*32)(*range(1,32))
>>> hexstring = ''.join('%02X' % b for b in sn)
>>> print hexstring
0102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F00
>>>

answered May 4, 2015 at 12:52

ldx.a.ldy.c

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