python shared memory object

[Mark_Yedinak · Accepted solution]

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@hallo77 wrote:

Thank you so much for your generosity in answering my questions. It does seem complicated, and it would take a long time to study it. I'll consider other options now. But this idea, if there is more time and energy in the future, I still want to have a try to break through myself. Thank you very much for your reply!

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Why so stuck on shared memory? Unless you need something highly performant than just go the TCP route. In the end it will be much easier to implement and much more flexible. Yes, LabVIEW can act as both a client and a server. In fact, a single LabVIEW application can have multiple clients and servers running at the same time. The systems I am working on are rather large and complex and use a publish/subscribe messaging system. The larger applications I work on have dozens of servers and clients all running asynchronously.

[hallo77]

No, I admit that TCP is a good choice. It's just that I think I want to structure the data sending and receiving area between Python and labview to make the logic a little easier. Because the amount of data I want to transfer is not very large, using TCP will not be a bit overqualified. But I still prefer to use this method. Thank you very much!

[rwunderl · Accepted solution]

And yet another option would be to use a real message queueing system to handle the transfers of data without any knowledge of TCP or UDP programming. ZeroMQ has an API and examples for LabVIEW, and the pyzmq module comes with Anaconda or can be downloaded from PyPI. There is a Python example here, but I would recommend reading the guide.

Using a basic PUB/SUB architecture, you can achieve what you want very easily. Moreover, the PUB and SUB need not be on the same computer and the code would not change a bit (just update an IP address). ZeroMQ takes a bit of reading to understand, but it is well worth it versus that same time stuggling to get your own TCP server/client working robustly. But perhaps your application is simple enough that it is not necessary to be very robust if you are only ever on localhost.

[hallo77]

Thank you!It is a great idea.I would have a try.Thank you very much for your new ideas.