Programmically change trace database URL NI HyperTrend

[Dan@NIST]

Hello,

I would like to be able to programmically update/change the URL for the traces in the activegroup of my NI HyperTrend while the program is running. The reason I want to accomplish this is because the program automatically create a new database then updates the library properties to point to the new database. The NI HyperTrend no longer will plot the current data since the data is no longer logged there. So I need to change the database URL of ITrace2 properties to the new database.

Attached is a bmp file which shows the block diagram of what I think should be how this is done. I get an -2147417851 error of which I don't understand. Please Advise, thank you.

[Dan@NIST]

ok I would like to use one of my life lines...ummm call a friend or well an application engineer...

Don't mind me, I don't mean to sound rude. I just have had WAY too much coffee...

[Dan@NIST]

Here is the actual VI

[mishkin]

Something I found right off the bat that may help:

Try running your main VI and subVI in the User interface thread. 

To run a VI in User Interface, go to File>>VI Properties>>Execution and select User Interface for preferred execution system. The default is standard.

[Dan@NIST]

Little note here. The posted vi is not 100 complete. I have not finished the process of changing the URL strings[] to the new database name url. So the updateDBpath case is not done.

[Dan@NIST]

I set the mainVI and subVI to excute in the user interface and got an error.

 -2146959355

Server execution failed
 in trendViewScrn.vi->testingSubVI.vi

I also tried it in standard for my own exploration.

-2147417851

The server threw an exception.
 in trendViewScrn.vi->testingSubVI.vi

[mishkin · Accepted solution]

Dan,

sorry for the delay - I can't find much on the error. One suggestion: when you pass the loop enumerator to the "index" parameter, try incrementing it first, in case the index system of the traces is 1-based and not zero-based. Let me know if this makes a difference. 

Message Edited by mishkin on 02-27-2009 12:31 PM

[Dan@NIST]

BINGO!! Wow... I would of never thought that would work!! Sweet Thanks!!

[Dan@NIST]

Or better said I would of never thought to try that.