Reading DINT about python-snap7

[hkocaoglu]

i found a solution. i edited the util.py and add the following function:

def get_dint(_bytearray, byte_index):
data = _bytearray[byte_index:byte_index + 4]
dint = struct.unpack('>i', struct.pack('4B', *data))[0]
return dint

[spreeker]

Well make pull request and add a test to the test code and we can add your
code to the codebase!
On Jul 7, 2014 12:03 PM, "hkocaoglu" [email protected] wrote:

i found a solution. i edited the util.py and add the following function:

def get_dint(_bytearray, byte_index):
data = _bytearray[byte_index:byte_index + 4]
dint = struct.unpack('>i', struct.pack('4B', *data))[0]
return dint

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Reply to this email directly or view it on GitHub.

[gijzelaerr]

Hi Hkocaoglu,

We maintain python-snap7 in our spare time, so we don't always have time to incorporate changes like these. It would save us time and effort if you follow our development contribution guideline and issue a pull request fixing this issue:

http://python-snap7.readthedocs.org/en/latest/development.html#github

Greetings,

• Gijs

[schlamar]

DWORD and DINT should result in the same integer value in Python, so this is clearly a byte ordering issue (in python-snap7). You should explicitly use big-endian (as you are already doing it in get/set_real).

@hkocaoglu r is just the ASCII representation for 114:

>>> [ord(c) for c in b'\x00\x15r\xcf']
[0, 21, 114, 207]