Write to a file using UTIL_FILE

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• Issue of table + write to the file

  Hello, I am using USB-6009 with Labview 8.5

  I searched and passed tutorial table and still confused about acquisition of data...:)

  So here's what I'm doing (simple)

  I have two tension analog (AI0 AI1) returns through the DAQ assistant

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  Can I have an example of table VI with the DAQ assistant? all the tutorials I went on

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  Quesetion 3.

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  1. you should be able to double-click the convert to Dynamic Data and convert the waveform in a table.

  2. just connect the output of the VI DAQmx Express write it on the Express VI of LVM.

• write to measure file vi bug?

  Hello.

  Looks like I might not be the first with this.  I suspect...

  http://forums.NI.com/NI/board/message?board.ID=170&message.ID=234485&query.ID=1018110#M234485

  I still after that I don't know how many hours days etc., failed to do this work.   I had to go and do a 'real' job, as it is called here for a few days or so, don't play no not with the software, however, is that asked me to do.

  This is all about 'Writing as Data File' express VI comes with LV 2009.   Used as Cree in the document "Getting started with LabView" infamous.   Running on XP Pro, perfectly (until tomorrow "Patch Tuesday" maybe.)

  Writing on a data file Express VI:

  It works the first time, no mistake, a lot of data, the first time entry to activate is made true, even if I leave it is true, thankfully, it creates several KB of the planned just as data file.   Do activation enter False, writing to the file STOPS, again just as expected.

  New do right and produces an error (the chemin\nom of the input etc file is still there and equally valid that it has always been) and no data is written in the file, despite no changes to the inputs of the VI (with the exception of the data of unique signal value)

  However, if give you him a new one (same file path\new) file name, and then he would write in the new file every time.  It's without blocking the program as a whole.

  I can navigate between two files just fine.   But it just will not write to a file first, that it is "Re" active after a deactivation is used.  Re entering the same path\filename is not a solution.  It must be another to wake up the thing.

  As it is, it's worse that useless for any serious application, and as the other party, I can't imagine how he got through the mill of QA.   As the other party, it is sold on the fact that it is supposed to be easy to plant items/icons on the comic and join the dots to make things work.  While largely true and there are a lot of good stuff here, there are a lot of things that exist for travel upward and confuse him.   The help is too small.  I get the phone call and email to other types of NOR, but no solution to the problem.

  If you want a copy of the VI program all the so-called fine, just someone tell me what and how to download it on this forum (very strange).  I can upload images, but I can't find a way to "attach" files, etc.  Or to work through the Getting Started document (as I have now three times!) and you will find the problem.

  Oh, and I seem to have lost the indicator as to how much
  days of "evaluation" I left.  I can't find a switch to make it appear that
  Gray more splash screen.

  Kind regards.

  Dave Baxter.

  Technical Director:

  AR - UK Ltd.

  I think that there is certainly a bug.  I can see where it is going, but I don't know why he got that way.  This VI shows the bug in LV 8.6 also?

  Right click on the entry to measurement file Express VI.  Inside that is a Subvi, called ex_subFileWrite.vi.  It is a clone of a reentrant VI, so it is quite difficult to follow execution through it.

  Somehow the first time through she builds and checks the file name based on what comes into it.  She that stores into a shift register.  If you clear the writing to a file, the shift register is stored which is not a constant of path.  Later, when writing is reactivated, it uses just the path (not a path) from the shift register, rather than back in the name of the input file.

  Exactly where this is really out there, I'm not sure, because express VI makes such a spaghetti with inter twisted code for managing all types of files and in writing the conditions and a lot of manipulation of file file path.

  I think the reason that edit the path and even change back works is that there is an initial control if the path is the same and if it is different, it works with the new file name, if it isn't, then it works with what was stored in the shift register.

  A person of OR should look deeper into this substantive code of the Express VI and try debugging.  I think that there is a bug.

  But here's a work around.  Use a select statement to send the correct file name if the writing is enabled, or a file path empty if it is not enabled.

  

• Write to the file of text formatting issues

  My apologies if I touch on a topic that is discussed elsewhere.  I have two questions, which seems to be related, I'll have to overcome the difficulties.  I date of blood collection, converting it to a temperature and then writes the timestamp, temperature, voltage, and original tension to the file.  Currently, when I write these values to the date and time of the file appear on a single line, temperature and tensions appear on the next line, and then there is a space before the pattern repeats.  In addition, before data are collected I write information in a header, and if you look at the .csv file attached, you will see that the data are that all offset a column to the left.  Any ideas how I can fix this problem?  My code is probably speaks for itself, but I really am a novice, so any general idea in the non-jargon terminology will humbly accept.  Cheers, Peter.

  GEO,

  Do not build your strings in an array of strings.  An array of strings are written a / line in the function "write text to a file.

  Use the function to concatenate strings and string together a tab character between the date/time and the first value.  The "write text to file function will add its own chain of end of LIFE at the end of writing.

• Quickest to write data to file

  Hi all! [This is my first post here so please be kind =]

  I am creating a data acquisition + digital output system and spin in data acquisition issues AND writing of data in a PDM file.

  -The module must divide an interval of 10 seconds in blocks of 20 500 ms. The data will be acquired during all the 10 sec interval and written to the file.

  -During the first block (block 0), a digital output is set to high

  -Based on the number of peaks detected at the entrance during blocking 0, another digital output will be so turned on during the channels meeting the condition of the art for the duration of a given number of blocks (user-defined).

  -At the end of 10 seconds, this process will be a loop

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  As soon as I take this writing to file out of the loop, the module works fine without error, IF I do not use a program in the background, like the Chrome (this also triggers the same mistake).

  I need this program to run at a minimum of 24 hours, so it is important that this can work for a long period of time. An idea that I thought was of buffering data and then write to file both after 10 seconds... but am not sure how to implement it. In addition, I don't know if something about the way I wrote the code kill processing power and causes this error.

  Any help is greatly appreciated!

  
  

• Write to binary files

  I want to save data in a binary file. This VI takes into account several channels and displays them in a bar chart. The generated waveform out with precision, but the generated text file does not save the data. It's only a few characters long, and I don't seem to be able to interpret it at all. I tried to save the data of type variant and the data after the conversion (before it is in graphic form). The files and the VI are attached below. Any advice on where I'm wrong would be greatly appreciated.

  

  Shultz,

  Do you intend to write a binary file (more effective, unreadable by humans) or (less effective, human-readable) text file?  They are of two different file types.

  The code in your screenshot opens a text file but then saves the binary data of the Variant.  These data are likely not as ASCII (text) format so when you try to play you see what appears to be garbage (really, what happens is that your text editor's interpretation of the 1 and 0 of binary data of type variant as ASCII coding).

  If the chart appears correctly, then I think that the GetData UMCBICONN2 returns an array of numbers.  In this case, you want to convert this table of numbers to strings, and then use writing text VI of file to save to disk as follows:

  

  Sorry for the screenshot - I would normally post an excerpt or at least fix the VI but I work on a development machine that does not have a version of LabVIEW on it and you don't would not be able to open any VI I saved.

  I hope this helps. Best regards, Simon

• create the new file using report generation express vi

  Hello

  In my application, I need to write that certain data in spreadsheet Excel. For whom I created an excel template and I used the express vi report generation Toolkit to record appropriate data in the columns of the place. I need a new file created every day by the name of the day and write the data that he rest of the day. I have problems, create the new file using this express vi. I tried to use the low level vi but not able to make properly.

  Join my code and the excel template.

  Help, please.

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  I suspect that your problem is illegal characters (' / ') in your path, certainly it is the case in your original vi. You need to format your path, something like this (underscore instead of a slash stroke):

  

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  The tabs are from the table to the string of worksheet function.  You build a chain of worksheet, complete with tabs and CR.  Just drag a concatenate the strings in his place and it will work.

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