Extra characters when writing to file

Hello,
I'm currently working on a datalogging system using XP and 8.2. Our program monitors CAN messages, saves values to local variables, and records to a text file based on several inputs from the front panel (file location, ms delay, and write ratio of fast update to slow update parameters). In the interest of saving disk space some variable are only written every "Write Ratio" times the fast variables are recorded.
The file creation works fine, and the write to file works fairly well, but I get garbage characters at the beginning of most lines. You can see in the attached text file there is an extra "J" before my header (not a big deal) but there is also an extra character at the beginning of each line. Usually it's a square, but on lines which will eventually write all the variables it fluctuates between a space, ", or !. I've also gotten files with a * or ). Any idea why I'm getting these? My gut instinct says it's caused by the Write Counter >= Write Ratio Case structure or the EOL constant in the main concatenate strings. I've tried changing both the EOL constant and the false case write string with the same problems.
While I've got the sample posted, is there a better way to implement my traveled distance function? The sequence structure seems...inelegant in this case. I could post my entire prototype VI if that would help, but I'm a bit secretive of its contents and simultaneously ashamed at its ham-handedness.
Thanks
Mark
Attachments:
Write Problems1.vi ‏68 KB
phev_0225_1336Drive1.txt ‏4 KB

Tbob,
Did you try saving the .txt file to your hard drive then opening from there in notepad? Doing a open in new window from the browser gave me a blank screen, but saving the file and opening in notepad worked and looked like the attached.
Mark,
I don't know about the J. But at the beginning of most lines in the .txt file I see a square. Doing a copy and paste into a string constant in labview, then converting it from normal display to hex display, it is the Hex character 13 which is decimal 19 or a Ctrl-S or DC3. Maybe that will help you find the problem.
One thing that is kind of odd about your write VI is that you are converting all the numbers to strings, but you are feeding that into a Write to Binary file VI rather than to a Write to Text file VI. I bet that may be the source of the problem.
Edit: This may also explain why your "text" files are quite showing up in the browser.
Message Edited by Ravens Fan on 02-25-2008 06:13 PM
Attachments:
phev Drive1.PNG ‏30 KB

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Attachments:
03_02_15.vi ‏688 KB

alfredog wrote:
Hello,
I am new to Labview and having a bit of trouble. I attach some code here. What I want to do is sample from a NI 9220 DAQ from 16 channels at 20kHz, while from a second NI 6009 sample from 4 channels at 1000 kHz. I want to append these together and then write to a TDMS file.
I have tried to write this code using NIDAQmx VIs but when I have it has resulted in the two DAQs not having the right timing with each other. The 6009 samples for a longer time.
I have now tried instead to use the DAQ assistant to read from the two VIs and it works in that TDMS files produced have the correct timing between the two DAQS. However, if I record for more than 2 minutes, in the end I want to end up recording for a much longer time, I have the "Not enough memory to complete operation" message appearing. This still happens even if I get rid of my charts to display the data, and also if I get rid of the NI 6009 completely and just keep the 9220 sampling at 20kHz. It happens even if I repalde my TDMS write and put a write measurement assistant in which I tell it to write a series of files that are each less than 2 minutes long.
I think it is something to do with the amount of data I am reading and is being held in memory. What can I do about this? Also, my charts display very slowly, basically evey second when the 20k are read in. However if I lower the amount of data read the charts don't display all the data points.
I attach my code, thanks for your help!
Alfredo
As far as your charts updating very slowly - the way your code is designed, your charts only get data when both 20K samples & 1M samples are done collecting. Have you tried setting up DAQ assistant for continuous sampling instead of 20K samples or 1M samples?
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E71 also steals characters when writing characters...

Whenever I write a text message and use one of those character á,ã,í,ó,õ,ú or č,ć,š,đ,ž (Serbian Latin) for the first time in a message it takes 91 characters. And when you use it for the second, third... time it takes 1 ch. WHY?
That is also a problem on all other nokia symbian phone (my experience with 3650, n70, n73). I don't have this problem on NONsymbian nokia phones and all other non nokia phones.

Is that phenomenon similar to this: "normal" English characters take up 1 character. But mix Chinese characters the count jumps by around 50% more.
I've learnt to not mix English and Chinese messages whenever possible.
Never got around to finding out why though
E71! Lovin' It!

How do i create a new line when writing to file

I am trying to write a few stings to a file but i cant get them to print on seperate lines. They all end up together. I tried to include the \n in the string but that didnt work. Any suggestions? I thought that this part would be simple.

http://forum.java.sun.com/thread.jsp?forum=54&thread=450725&tstart=0&trange=15

Extra characters when writing to file

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