how can i run this vi continuously?

[frentzen]

Hi,

i want to run this vi continuously , but i get the following mistake "The data type of the Variant is not compatible with the data type, which is connected with the entrance". has anybody a sollution?

i attached the vi and the xml-file i want to read.

Thanks, Thomas

[LAVA 1.0 Content]

CITATION(frentzen @ Mar 5 2007, 01:21 PM)

Hi,

i want to run this vi continuously , but i get the following mistake "The data type of the Variant is not compatible with the data type, which is connected with the entrance". has anybody a sollution?

i attached the vi and the xml-file i want to read.

Thanks, Thomas

Hi,

I get no error when I run your code...

[Mikkel]

QUOTE(frentzen @ Mar 5 2007, 01:21 PM)

Hi,

i want to run this vi continuously , but i get the following mistake "The data type of the Variant is not compatible with the data type, which is connected with the entrance". has anybody a sollution?

i attached the vi and the xml-file i want to read.

Thanks, Thomas

In stead of using a script to parse your XML file, you could try to parse the XML data (after reading it as a text file) by using the LabVIEW VIs "ParseXMLFragments.vi", "FindFirstTag.vi", "FindMatchingCloseTag.vi", all located in \vi.lib\Utility\xml.llb.

This would solve the variant related problems, as well as being more clean code.

-Mikkel

[frentzen]

ZITAT(Mikkel @ Mar 5 2007, 02:08 PM)

In stead of using a script to parse your XML file, you could try to parse the XML data (after reading it as a text file) by using the LabVIEW VIs "ParseXMLFragments.vi", "FindFirstTag.vi", "FindMatchingCloseTag.vi", all located in \vi.lib\Utility\xml.llb.

This would solve the variant related problems, as well as being more clean code.

-Mikkel

Hi,

Thanks for your answears. i just forgot a little thing to mention. I want to run the vi continously with file path integrated in the vi.

the xml-file gets new data every minute and the vi should always get the new data.

thank you so far,

thomas

[Ton Plomp]

This is a long shot,

but generate a .net callback VI for a file change event.

No I don't know which .net event you need, but if you figure it out and share it with us it would be great!

Ton

[Mikkel]

QUOTE(frentzen @ Mar 5 2007, 03:15 PM)

Hi,

Thanks for your answears. i just forgot a little thing to mention. I want to run the vi continously with file path integrated in the vi.

the xml-file gets new data every minute and the vi should always get the new data.

thank you so far,

thomas

Well, then it would be natural to use a 'While Loop' around your code. If you want the path to be constand, you can use a 'Path Constant' on your diagram. Once a second (use 'Wait (ms)') you could check if the datafile's time/date has changed, and reread the file if it has. More information about loops, delays, and file operations can be found in the examples installed along with LabVIEW (Help/Find Examples...).

-Mikkel

[frentzen]

ZITAT(Mikkel @ Mar 5 2007, 03:56 PM)

Well, then it would be natural to use a 'While Loop' around your code. If you want the path to be constant, you can use a 'Path Constant' on your diagram. Once a second (use 'Wait (ms)') you could check if the datafile's time/date has changed, and reread the file if it has. More information about loops, delays, and file operations can be found in the examples installed along with LabVIEW (Help/Find Examples...).

-Mikkel

Hi,

i put the path now into the vi, but i still got the same failure notice. the german ni support told me, it runs without problems.

has anybody a solution?

Thanks a lot.

Thomas

[Mellroth]

QUOTE(frentzen @ Mar 14 2007, 12:28 PM)

i put the path now into the vi, but i still got the same failure notice. the german ni support told me, it runs without problems.

has anybody a solution?

I tried your VI, and it gave an error (you should really check the error outputs) stating that temproot was NULL.

To make your VI run without this error, I had to fix the file name from "Mean[1].20061013_123043.xml" to "Mean.20061013_123043.xml".

Hope this helps.

/J

[frentzen]

ZITAT(JFM @ Mar 14 2007, 01:39 PM)

I tried your VI, and it gave an error (you should really check the error outputs) stating that temproot was NULL.

To make your [wiki]VI[/wiki] run without this error, I had to fix the file name from "Mean[1].20061013_123043.xml" to "Mean.20061013_123043.xml".

Hope this helps.

/J

That really helps. Thanks a lot.