Shared variable

[0Forest0]

Hi to all.

I collect data from different computers. The data forms one array. How can I set the specific elements of the array on different computers? I did it on a local machine use notifier array. But via network that will not work. If I'm going to use shared variable then I need read all array and write it on each computer. Or I need to create many shared variables and write to them. But in this case they have a quantity limit.

[GerdW]

HI Forest,

How can I set the specific elements of the array on different computers?

You cannot…

Or I need to create many shared variables and write to them.

Yes.

But in this case they have a quantity limit.

Why? Which limit? Which quantity?

[johntrich1971]

You might also consider a different architecture. For instance, you could create your own "network notifier" using, for instance, UDP. If you need lossless communication then Network Streams might be an option.

[0Forest0]

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@GerdW wrote:

But in this case they have a quantity limit.

Why? Which limit? Which quantity?

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I mean if quantity of parameters will increase I need add them and recompile the app.

[GerdW]

Hi Forest,

you could also change the datatype of your shared variables to something like [number of channel, value of channel] (or even better [name of channel, value of channel].

Then combine this with a key-value-pair based table to hold the values of all channels…

[0Forest0]

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@GerdW wrote:

Hi Forest,

...combine this with a key-value-pair based table…

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The problem is each computer must read all the table(or array), change a few parameters values and then write all table. And it's wrong. I need something, which will be in server and have a variable size.

Like if I could programmatically create shared variables.

[GerdW]

Hi Forest,

have your clients read the whole table, but send back only the changed parameters/entries!

[0Forest0]

Hi, GerdW.

Would you show, how it possible? I don't imagine how I do this with shared variables.

[GerdW]

Hi Forest,

I don't imagine how I do this with shared variables.

Have your server provide two variables:

1. the whole table so your client can read them
2. a cluster of (atleast) "index, new value" so the clients can send commands to update single values

Now a client can read the table, do its changes and send the information changes to the server…

[0Forest0]

Do you mean like that?

But if the clients will in asynchronous write. They will not interfere each other?