How to read a same file several times in a loop?

[菁菁]

Dear all:

I want to read a file several times in a loop from "read from a measurement file", as for every time the result of lower part of my whole VI need to compare the data from the same file from "read from a measurement file".

But I don't know why, I only can get one correct result for my whole VI, whenever my whole VI run to second time, there will show an error from  "read from a measurement file". The error is "Error 4 occurred at Read From Measurement File -> get several measurement.vi, Possible reason(s):

LabVIEW:  End of file encountered.
=========================
NI-488:  Invalid argument or arguments to function call."

and to Mike:

I tried to change my VI as your two ways, The first one, although there is no error it still can only get one result, not the number I define for the loop N. The second one, I have wire problems, please check.

Thank you for any help!

Jing

帖子被菁菁在05-26-2008 04:03 AM时编辑过了

[MikeS81]

Hi jing,

if a run the attached example the loop runs 7 iterations. So if you really load every time the same file, it should work for you.

Mike

[菁菁]

Hi Mike

It looks run 7 times and no error but I only get one file in the path of "write to a measurement file"

Jing

[MikeS81]

Hi jing,

it could be, because you have everytime the same path. You can use the "Format into String function" to add the loop count to your filename.

Mike

[菁菁]

Hi Mike

The "configure write to measurement file" I choose "If a file already exists Rename existing file"

Is that possible when the second file come the file can be named "backup" or something like this? and I still can get the 7 files just the name is backup or?

Jing

[MikeS81]

Hi jing,

yes you are right, this should also work. You should have all data now in one file, right? Change the reset input to "true". This should work.

Mike

[菁菁]

Hi Mike

where does the reset input to "true" you mean ? which reset?

Jing

[MikeS81]

Hi jing,

i have insert it into your example.

Mike

[菁菁]

Mike

yes now I have all data  in one file,

Jing

[菁菁]

Ok ! Mike

Danke sooo.....oooo  much!

Jing