Working with Enums

[Thomas Bowley]

Hi guys

Please excuse me if this sounds stupid, I've only just taken up Python and came across Construct.
It already seems perfect for my task of defining command/response frames in a serial protocol I'm working with.

My problem is that I don't know how to use Enums in the way that I am used to in other languages eg. C#, Java or C for that matter.
It might be explained in the documentation - if so, I'm just to thick to understand it. :)

Having the different possible commands defined like this:

FrameCmd = Enum(Byte('Command'),
                    ReadAbsoluteData=0x00,
                    WriteAbsoluteData=0x01,
                    ReadDataBlock=0x04,
                    WriteDataBlock=0x05,
                    ReadNewTelegram=0x07,
                    MakeNewDataBlock=0x08,
                    DeleteDataBlock=0x09,
                )

I would expect to be able to use it as such:

TransmitCommand(FrameCmd.ReadDataBlock)

or in a test like such:

if FrameCmd.ReadDataBlock == .... :

Does anyone know how to use Enums in Construct like so?

[Benjamin]

Construct isn't really designed for this particular usage, so while it's possible, it's clunky:

TransmitCommand(FrameCmd.build("ReadDataBlock"))

For your usage here, you probably just want to make FrameCmd a simple class:

class FrameCmd:
    ReadAbsoluteData=0x00
    WriteAbsoluteData=0x01
    ReadDataBlock=0x04
    WriteDataBlock=0x05
    ReadNewTelegram=0x07
    MakeNewDataBlock=0x08
    DeleteDataBlock=0x09

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[Arek Bulski]

Here is Enum example:

http://construct.readthedocs.io/en/latest/advanced.html#other-short-fields