Detection of folklore in "reading a spreadsheet file.

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• Is there a file size limit when using read the spreadsheet file?

  I'm reading in a large file, approximately 52 MB, 525600 lines with 27 fileds in each line using "Read SpreadsheetFile.vi". I then explore table 2D-999, which represents bad/no data in this area and the total number of fields with-999 in there. All works on 3 months ' worth of data. The program is giving me a memory error output and stopping in case reading takes place on the file of the year a large. So my question is that the reading of the spreadsheet file has size limitations? Is there a better way to do it? Thanks in advance for the help.

  ssmith

  
  

• Problem using: read the spreadsheet file

  Hello

  I have 2 problems with reading spreadsheet file:

  (1) for the use of .txt file I can get the first column and not the other (even if I chose the correct output...)

  (2) this does not at all when you use my .xls file

  I must do something wrong but can't find what...

  Has anyone an idea?

  I have attached the .VI and my two files.

  Thank you

  User

  A native Excel file is NOT a text file.  It is a format of custom file created by Microsoft.  This is why you must use ActiveX to interact with him.

  The worksheet ' ' folder features found in the work of LabVIEW with text files (delimited by tabs, CSV, etc.).  The text files are a format more generic that can be read by programs such as Notepad.  Tried to use Notepad to open an .xls file?  It does not work.  Excel can open a text file, because it is a generic format.

  So even if everyone automatically thinks "Excel" when they see the word "Spreadsheet", the two are not synonymous.  In the case of LabVIEW, 'Spreadsheet' made reference to a delimited text file.

  Who is?

• Read a spreadsheet File.VI - conflicts of files?

  I hope it's an easy question. Anyone who is familiar with the "File.VI spreadsheet read" how access the files? Specifically, I am writing a VI to read a log file CSV that VI another written in. I want to do that there is no conflict if the other VI is written to the log file at the same time I'm trying to read. I know that I can copy the log file, read, copy and delete the copy to ensure there are no conflicts, but I prefer not to do that from a performance perspective. Any help would be great. Thank you!

  This VI uses the functions of e/s standard file, which is to open the file, read it and then close it. The open mode is set to 'read only', so as long as the other application is not having some kind of lock on the file (you don't specify what operating system you are using), you should be OK with just read the file. Of course, you may not get the latest content of the file, because it depends on when the OS actually flushes out the contents of the buffer to the file on the disk.

• Spreadsheet file reading Assistant

  I save all my data in a text file (see file attachment). The problem is that when I try to use the reading of spreadsheet File.vi I'm not clear on how to show all my data.

  Does anyone know a far for me read the entire file and display it at the same time im that line by line?

  Hi xXChazXx,

  Please see the attached picture. If this is not enough, then please explain what you need.

  Mike

• usefulness of reading the measurement file express vi

  Hello

  I found reading file express vi measure in LV7.1 does not read from the beginning of the file when you run it the second time. Instead, it resume from where it left off last time. Usually, the user would read the entire file measure each time. So when you try to read the second time, it will show an error window saying that it has reached the end of the file (because he was reading the entire file first).

  I wonder how useful to resume from the last stopping point is? Is there a way to start over each time that the VI excute it?

  I'm sure that's how reading file measure works 90%. Whenever she is called in a single run of the application, it will start off the coast where it was stopped. You will need to work with the low level screw to get what you want to do.

  This Express VI works in a similar way the screws and the following functions:
  Open/create/replace file
  Read text file
  Read binary file
  Read the spreadsheet file
  File dialog box
  Scan to file

  And, you can always use the node to set the file Position to set the position at the beginning of the file.

• file dialog (read/write spreadsheet) causes the program to freeze hang

  LabVIEW 8.6, in the first loop, I use the spreadsheet write vi to register data acquired from an SCXI module / PXI system to a specific folder on the desktop. I have a second loop (with the event structure) which uses the spreadsheet read vi to read a data file specified user whose trace it then. The problem I encounter is when the file vi prompt dialog box runs into the spreadsheet read vi, the first loop (it says data continuously) crashes until a file is chosen and opened. Any suggestions on how to get these two functions to work together?

  Then use a control path of the file on your front and then the user can still select the file by clicking the Browse button. The other loop will run if the user clicks the Browse button to select a file. In your code so the event is triggered by an empty path, do nothing.

• How to save a 'writing on a spreadsheet file' read-only

  I write data in a loop in an entry in the worksheet vi. When it is complete I want the file to read only when it is open in excel.

  In the IO files-> advanced palette there is a function called to set permissions.  Please read the help file on this function and follow the link to how to set the permissions.

• LabVIEW allows to read an Excel file to a control and add a checkbox for each line

  As say the topic, I need to use labview to read an excel file and show it in a control, such as mclb; I should add a checkbox for each line then allow me to choose the line I want. What should I do? Thank you very much.

  guiming wrote:

  I can read an Excel file to a spreadsheet, but I have no idea how to do to add a checkbox for each line.

  Sometimes, all you need to do is Google. https://decibel.NI.com/content/docs/doc-25000

  http://www.labviewing.com/check-box-in-multicolumn-ListBox/

• Incorporate the binary string in the string spreadsheet file

  Hello LabVIEW wizards...

  So I use scripture to VI file spreadsheet to create a beautiful layout, tabs-delimited report of one of my programs for the acquisition of data file. In one of the cells in the resulting worksheet file that I want to put a binary string of all my control values so when you open the data file all the control parameters used for its manufacture are restored, but the string is hidden when the report is displayed in Excel.

  The problem is that the binary string flattened uses tabs and returns as part of its syntax the Spreadsheet File this VI to Write it's going in all directions. Worse yet, I can't unflatten chain when I open the file text because of "corrupt data or unexpected".

  If I concatenate the string flattened with quotes around it she is superb and is placed in a single cell in Excel, but when I open the file in LabVIEW that she is still several elements in the array. I've isolated the binary string using the file VI text reading and got a subset of the quoted string, but it still unflatten correctly.

  Essentially, I need to know how to get LabVIEW to pull a string literal full of special characters into a spreadsheet file and it unflatten. Any gurus what help you can provide is greatly appreciated.

  Thank you

  Jordan

  Jordan

  I suggest that you change the formatting of your chain shipped by replacing the tabs and returns with other characters that are not considered as commands by the spreadsheet functions. Without knowing how you represent your control binary values, I can't offer specific characters.

  If two non-printable characters exist which do not appear in the control data, it's easy: just find and replace tabs and returns with those characters.  If there is no character, then something more complex needs to be done for example to escape special characters.  Or create two subVIs - one to remove the tabs and returns before writing the string in the file and the other to restore after reading.

  Lynn

• Write to the spreadsheet file (how to start new lines)

  I'm reading signals from a hardware device and try to write it in several columns using Scripture in the spreadsheet file every few seconds.

  My problem is every time a new signal comes in, my program seems to overwrite the previous signal when writing to file, when (say after 2 minutes), I go to check the written file, it shows only 1 row of information. How can I fix?

  Part of my VI and the output file is attached.

  If the program segment shown in your picture is inside a loop, then the section header write overwrites the file each iteration of the loop.  So, you see only the data for the last iteration.  Solution: Move portions header to write and write the names of channel out of the loop or put them in the case of structures that run only when you want a new file or new channels.

  Lynn

• Reading input data file

  Dear all,

  I wonder if someone helps me.

  I have a labview program which I am using right now. At this point, I need to read an input (dat or txt or excel) file in real time.

  for example, here's my data entry (2 columns and 5 rows):

  1.2 2.2

  2.3 2.3

  3.05 3.3

  4.3 4.4

  5.2 5.5

  for example in evry second I want to read a jut line and do the math. in this way, in real time, I can read each line one by one.

  How can I do?

  Kind regards

  Mehdi

  For the text, simply use the reading of spreadsheet. Take exit 2D and wire of a loop for. put a wait of 1 second inside the loop and you are finished.

• worksheet to no array string not read any .txt file

  I am very new to Labview.

  I'm reading a .txt (positions.txt) with reading In.vi file.

  However, the result is not what I wish it to be. The first 3 rows are omitted from the result table, but I don't know why.

  I followed the tutorials and can't see why the resulting table starts 4th.

  Hi marvin,.

  is there a reason why you want to create a table of dimension 4?

  If your reading the LabVIEW has helped, how LabVIEW formats (or hope) spreadsheets for table dimensions > 2?

  Solution:

  Change the constant matrix and indicator in a 2D table!

• Adding handwriting on a spreadsheet file

  Same problem as this guy here:http://forums.ni.com/t5/LabVIEW/write-to-excel-spreadsheet-in-columns-and-append-to-file-in-a/m-p/10...

  I'm in labview 7.1.  I am reading data and want to add on the new columns, while the excel spreadsheet function simply adds it on the bottom of the file.

  Y at - it an easier way to do it, or should I write a VI that reads from a file of the current worksheet, and then adds the data in the table, as said in this link?

  Thank you

  If you want to add columns, you will need to read in the data spreadsheet and use insert into to add to the columns Array.  Simply specify column instead of the line index indexes.  Or you could transpose the table insert in Array by using the row index and then convert again.  Then write all back.

• Generate a waveform self-defined by reading an excel file

  Hi all

  Now, I'm generating a waveform of salt-defined by a PXI. Attached is a vi I built for the generation of AC signals, in vi, I used a signal generator to a wave of sinnusoidal of generrate of alternative voltages. I guess I can replace this signal generator with a block that can read an excel file which contains instances of time and their corresponding voltage.

  Can you please tell me if this idea works. If it is, block who can do this job?

  Thank you very much.

  Yes you can.

  The easiest is to have Excel to save the data to a CSV file.  Use of spreadsheet file to get data in LabVIEW.

  (Search the forums for Excel.  This question has found thousands of times before).

  I recommend you watch the LabVIEW tutorials online
  LabVIEW Introduction course - 3 hours
  LabVIEW Introduction course - 6 hours

  PS: They are called functions or Subvi, not of 'blocks '.