Webvisu client connection monitoring

2024-09-10T07:56:36.604000Z

https://forge.codesys.com/forge/talk/Visualization/thread/b12815b7cd/#877a

there was a discussion about this thematic

searching in the talk helps to learn from others...

good luck, Dave

Webvisu client connection monitoring

2024-09-10T05:41:48.935000Z

Hi mate,

With this snippet i was able to see the lastusage variable count, but it would not iterate between clients? i was only able to access the data of the target visu.

it threw an error with the array of pointers stating it was not able to convert etc. also when i tried it with the while loop it created an endless loop and crashed the program.

any ideas? Thankyou

Webvisu client connection monitoring

2024-09-09T13:43:29.912000Z

you can give this code snippet a try. It's extracted and simplyfied from my code:

Install VisuElemBase lib if not installed yet.

Execute in visu task:

VAR
    pClientData     :  ARRAY [-1..100] OF  POINTER TO VisuElemBase.VisuStructClientData;
END_VAR

VisuElemBase.g_ClientManager.BeginIteration();
pClientData := VisuElemBase.g_ClientManager.GetNextClient();

WHILE pClientData <> 0 DO
    pClientData[pClientData^.GlobalData.GlobalClientID] := pClientData;
END_WHILE

You have to make shure every no longer updated pointers in the array have to be deleted and no longer used by your code!

Usage of this pointer access at your own risk :-)

Works with SP16. From SP17 and newer there will be warnigs etc. using this solution as I remember.
It will be great, if Codesys publishes a example or give a hint how to accesse this client values with the VisuUtil lib or other future-proof way!

Webvisu client connection monitoring

2024-09-09T06:08:59.310000Z

can you send me some code snippets of the declarations and code need i am unsure of how to set the pointer to the correct visu client.

Thanks i appreciate your help.

Webvisu client connection monitoring

2024-08-30T11:51:46.551000Z

is your pointer set to the correct visu client? set a breakpoint in your client iteration and step through the active visu clients like programming system, targetvisu, webvisu,... and check the last usage value of each client

Webvisu client connection monitoring

2024-08-26T23:16:39.734000Z

Thanks for the reply,

i am using codesys SP16 patch 5 as this is the version that is compatible with my IFM controller.

i am accessing the lastusage variable from the VisuStructClientData structure through a pointer.

when i log in it lists the time since last log in but does not continually count, it remains a static value which isnt useful.

hopefully you can help. Thankyou

Webvisu client connection monitoring

2024-08-26T09:56:24.063000Z

this thread is 4 years old. Without more information about your current Codesys Version, code snippets etc., it's not possible to help

Webvisu client connection monitoring

2024-08-26T08:26:48.900000Z

Hi, i am interested in this thread and have tried a couple of the above examples in to determine remote webvisu access.

I am having trouble getting the lastusage variable to refresh during runtime? It seems to only log the last usage at initialisation and that is it? how do i gain ongoing access to the time variable as the code is running?

Thankyou.

Webvisu client connection monitoring

2020-06-15T14:38:26.028000Z

I don't know what exactly you do with your app...or if CoDeSys disconnect a Client...Try it!

You can also reset your button after a defined time... but if everything is fine you have to press again...

Sorry no other idea at the moment

BR Chris

Webvisu client connection monitoring

2020-06-15T14:24:17.812000Z

Will GVL.xVisuPageActive reset to false if the user navigates to another app on the tablet?

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