Write 2 chanel waveform data to text file

I ever posted similar question. Based on helpful answers form that post, I narrowed down my purpose and now post again in order to get more focused discussions on it.
In following VI, data from 2 channels are acquired, which need to be displayed and also written to a text file.
Since the 'write measurement file' express VI open and close in each loops run, I plan to get rid of it due to low efficiency.
I tried 'write to spreadsheet file' VI, failed. Also, looks like the 'write to spreadsheet file' VI also open and close file in each loop run, so it is not true 'low-level' VI.
So, I am looking forward to any hint on using low-level file I/O Vis to realize same function as provided by 'write measurement file' express VI.
Thanks a lot in advance.
Sincerely,
-Dejun
Message Edited by Dejun on 08-27-2007 03:56 PM
Attachments:
code.jpg ‏63 KB
try_write_file.vi ‏122 KB

I don't think you would have a problem with the array size getting too large. On each iteration, there is an N column, by N sample array getting generated (or essentially in the waveform), and that is inherently getting overwritten on each iteration. So I don't think you have a case of the array growing without bounds.
I do think it is a good idea to use the lower level file I/O so that you only open and close the file once before and after the loop. In theory, you shouldn't have memory overflow on the file open and close operations within the loop since each file reference opened is also getting closed. So go ahead and try some longer term operation of the program acquiring some sample data and recording it. See how it behaves. If it runs for as long as you need it to without problem, and you get all of the data points without missing any, there is no reason not to use it.
In principle, who isn't a good programming practice to repeatedly open and close the same file over and over because it could hurt performance, but that doesn't necessarily mean it will hurt performance depending on you particular application. So if you do have performance problems, or you want to learn how to use the lower level File I/O, go ahead and try using it.

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Write column by column.vi ‏1398 KB

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