Graph Capture and Virtual Channels

[g_dickinson]

I'm now playing with graphs. I am generating both useful and lovely graphs! I'm really have a lot of fun.

When I Right Click on my lovely graph and select "Capture" from the menu, I get a beautiful but data-less graph on the Scratch page.

The "Capture" option DOES create a set of new "V" channels, but no data populate these channels. Not a single row! I assume that the empty "V" channels are a big hint as to why my captured graph has no traces.

What am I doing wrong?

The channels that I'm using to create the graph that I'd like to capture have non-zero history lengths and non-zero Persistence lengths. And, these channels are packed with data!

I'm working with the Trial version of DAQFactory 5.79 Build 1574.

Gary D

[AzeoTech]

Hmm, I just tried it and it seems to work, so there's some detail off here. Maybe you can post or email your document so I can try it with your doc. If possible, do a "Save With History" first so there is some data for me to try it with. Make sure and indicate which graph you are capturing.

[g_dickinson]

I've attempted to attach the ".ctl" file that I am using.

The graph is on "Page_1".

I right clicked on the graph selected "Capture". You should see a copy of this graph on the scratch page (without any traces). The "V" channels were created as a result of the "Capture".

I then did a "save with history".

Thanks,

Gary D.

AquariumDemo1.ctl

[AzeoTech]

The problem is that you can't have spaces in your channel names, even V channels. Really you can't have spaces in any name in DAQFactory. All names must start with a letter, and contain only letters, numbers or other underscore. The graph capture is a really old feature that hasn't been updated I think since the beginning and so doesn't check this. I think its also auto-pulling the name from the title and you have a space in your title.

[g_dickinson]

Thanks,

I didn't understand that the graph title was also used as an identifier by DAQFactory. I was thinking it was purely text that was displayed above the graph.

But, now I see that the "V" channel identifiers that were created by the "Capture" code could not work properly because the embedded "space" in the grapy idenifier would be treated as a delimiter by the DAQFactory parsing mechanism.

Makes sense.

Thanks again,

Gary D.