Write result to file problem

Hi ,
the following is some code get result from html file and write them to a file, but I got error at this line,
String PrintWriter fileOut =new PrintWriter (new FileWriter("survey.txt", true))
any help?
Thank you

Have a gud look at it dude! Use PrintWriter fileOut =new PrintWriter (new FileWriter("survey.txt", true))...
-Nerd

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Write to text file problem

I have a write to 'text file' in a sub vi. It is a popup where user can change his program.
For some reason, only the first time it is called, it actually writes to the text file.
As long as the sub vi is in memory, and I call it again and press ok to write to text file, nothing happens.
I've tried 'close file', but that doesnt help. Deleting the files from the disk before again calling the sub vi doesnt help either, it wont write
to file again. Is this a bug or am I missing something?! Im on labview 2010

Post your VI (along with sub-VI's if any).
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

Data format problem with Write to Spreedsheet File

I have a problem with the data format with Write to spredsheet file.
I have an N*3 array, where the 3 elements in each row should has different length. When I used Write to spreedsheet file,
it can only save the three data in one format. How can I save them in the format of "%0.8f %0.3f %0.2f"?
Thanks for your help.

Hi powerplay,
another solution may be to convert column-wise using "number to fractional string", then interleaving resulting arrays and again using "array to spreadsheet string" (with "space" as separator).
Many ways lead to Rome
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

I want a stamp to write to the file metadata and be able to display the result in windows explorer.

I want a stamp to write to the file metadata and be able to display the result in windows explorer. I have read PDF Stamp Secrets and can write to Custom Metadata but don't know how to display that custom field in explorer. Can I have the stamp write to a standard (non-custom) metadata field? Or, how do it get the custom field to display in explorer? Windows is pretty stingy with the file details it displays for PDF files, in fact there are no editable fields provided (like are available for Office files). I want this to work for multiple users hopefully without having to get the IT group involved to make (or allow) system modifications to make this work. Any ideas? Thank you.

Metadata for Windows Explorer is tagged with different names than the metadata for PDFs. Acrobat cannot copy the metadata to the tagged items of the file header.
There are tools like EXIFTool that can manipulate the data as necessary. Phil Harvey also provides the details about the file types and their metadata tags and values so you should be able to map the tags that need to be updated.

Problem with Write To Measurement File Express VI not writing to file if file was deleted after the first call (7.1)

I'm using the Express Write to LabVIEW Measurement File in LV7.1.
I have it set to "Save to one file" and have tried both "Overwrite file" and "Using next available file name" for the "If a file already exists" conditions.
The path/filename is passed into the function.
It works fine the first time around. If the file is deleted before the function is called again, an error occurs since LV is unable to find the file.
I have had to stop and re-run my program in order to write to use the function again.
Since I am able to delete the file I assume it was closed but it seems like LV expects it to be there, even though the function was supposed to create/open/close the file... Is there any way to reset this without stopping/restarting the program?
Since my application creates several files (only one using the Express VI) I am checking for the filenames and requiring that they be deleted (or a new filename be used) before acquiring data. Everything has worked great, except for the Express VI.
Thank you,
David

Ok, I've edited the VI you posted to reproduce my error (this time with 8.0).
I added a "master stop" and "start log" button. To demonstrate my problem:
1. Run the VI
2. Click "START LOGGING" - c:\test.txt is created
3. Click "STOP" - c:\test.txt is closed
4. Delete the file c:\test.txt with Windows shell or explorer
5. Click "START LGGING" - a new c:\test.txt file should be created but instead an error is raised in the Write LabVIEW Measurement File function.
Any ideas?
Thanks,
Dave
Attachments:
Write LV Meas File 2.vi ‏96 KB

I have installed Adobe Reader 11.0.07 for Mac OS 10.9.3. Have asked this question numerous time without results. The problems I am having are: I cannot scroll using the side slider on downloaded PDF files, nor can I fill in fillable files. Also, and this

I have installed Adobe Reader 11.0.07 for Mac OS 10.9.3. Have asked this question numerous time without results. The problems I am having are: I cannot scroll using the side slider on downloaded PDF files, nor can I fill in fillable files. Also, and this is extremely irritating, I cannot re-initialize the same file or initialize and another PDF file after I have initialized the first file. If you cannot help please let me know if should use an earlier version of Reader or find anther company that has the appropriate software.

Perhaps you missed that you started a discussion at I have OS 10.9.2 and have downloaded latest version of Reader 11. I can no longer fill in form or scroll using the side bar. and you did not respond to the last post there.

Write in file problem

My problem is:
I wanna write in a file. But what happen if another application is writing in that file in the same time?
Is it possiple to check if anyone is writing in this file or what can i do not to get in a write conflict?
I use the class FileOutputStream to write in the file.

It is the job of the operating system to make sure that two applications don't write to the same file at once.
Bascially, you don't need to worry about this at all, it is handled automatically by Windows/linux etc for you.

How do I read and write to text files on a remote computer's hard drive

I would like to read and write data to a text file on a remote computer. This is easily accomplished using one of the file functions such as "write characters to file.vi". If I am already connected to the remote computer, all I need to do is specify the path to the particular file and it will work fine.
My problem is that I want to connect to the remote computer programatically within LabVIEW (I do not want to have to use the computer's OS to establish the connection. Is there a function that I can use to do this?
Thomas D. Schaefer
Wells Manufacturing Corp

Yariv,
You should really start a new thread with a new question like this, so that more people see it. Some people look primarily at threads that have no responses yet. Also, don't post the exact same question in multiple places. Or, if you must cross-post to some other forum, make sure to mention it in your question text.
I'm happy to be a brick in your Western Wall, but I'm not sure what the main objective is here. Is the main problem really getting access to the "X bytes received in Y seconds at Z bytes/sec" string? Or is it accomplishing the file transfer? And what OS and LabVIEW version are you running?
I think your problem is that you the LabVIEW System Exec command does not allow for the degree of interactivity that you need if you want to issue a sequence of commands to a command-line executable. However, under Windows XP (and, presumably, other Windows versions, though I can't check), you can tell the FTP executable to use commands from a textfile script by using the -s switch, and you can override the prompts during multiple file transfers with the -i switch:
ftp -i -s:FILEPATH SERVERNAME
If you issue a command in this format to System Exec, and make sure to create a file at FILEPATH with your command sequence (one per line), then you should at least accomplish the FTP actions. This won't give you the transfer details in the standard output, unfortunately. However, if you just want a general sense of how much was transferred and how quickly it happened, you can code that in LabVIEW by getting the resulting file sizes and using Tick Count before and after the System Exec call to see how long the transfer took.
Hope that helps,
John

Write to binary file

I have a relatively large 3D array (Phase Settling), which I want to store in a Binary File. The array is a 15000 point sweep (after decimation), repeated up to 48 by 48 times (in two FOR loops, one inside the other), meaning it can end up having as many as 34,560,000 data points. At the moment, I am attempting to dump that 3D array into a Binary File in one go, using the following VI. There are two possile versions of this array (both the same size as each other) and, depending on which has just been tested, they will be written to their own individual file. Once both tests have been run and their results stored, the idea was to open both files, subtract one array from the other, and store the new 3D array to another Binary File whilst also displaying this latest data elsewhere in a higher-level VI.
After its first trial run, LabVIEW presents me with an error message saying something along the lines of "LabVIEW had run out of memory". I assume it would be to do with this VI, since that's where the first error code appeared (Error Code: 2), apparently originating in a 'Write to Binary File' function.
Any ideas as to how I could get round this first hurdle, or perhaps an alternative method I could try?
Thank you.
- James
Message Edited by James Mamakos on 04-08-2010 10:07 AM
Never say "Oops." Always say "Ah, interesting!"
Attachments:
Running out of LabVIEW memory when writing to binary file.PNG ‏30 KB

Well, as shown in the attached screen-shot, the error indicator shows an error code of 2, and that the error occurred in one of the Write to Binary File functions.
However, when trying to save this particular VI after a couple of tweaks, I was presented with the following pop-up alert message:
LabVIEW: Memory is full.
Cannot save VI "Compare Amp - calculate.vi".
LabVIEW Save error code 10: Default data space.
Anyway, returning back to the main problem at hand, I've though of a couple of possible solutions...
We don't really need a particularly high resolution to the data points for the comparison, so I could convert the array doubles into an array of singles to save space.
I should be able to implement the 'Write to Binary File' for the initial arrays into the outer FOR loop, thereby reducing the amount data written in each instance by a factor of up to 48. The only problem I can foresee in this is that I'm not sure how to append 2D arrays into a binary file such that, when the file is read, they would appear as (or be easily converted into) a 3D array.
As for the 'True' case in my case structure, am I being grossly inefficient in my passing of data from one place to the next? I know there are a lot of branches (and buffers?) of 3D arrays; is there a decent way to reduce this overhead by tweaking the data paths or something?
- James
P.S. The computer I'm using has 1GB RAM.
Message Edited by James Mamakos on 04-08-2010 12:39 PM
Never say "Oops." Always say "Ah, interesting!"
Attachments:
LabVIEW - error code 2.PNG ‏35 KB

Write Record to File

Hi all
I am now doing a java program to query result from SQL Server and write the result to a file.
My problem is that our SQL Server stores Chinese wordings with unicode, after the program query the result and it fails to write those Chinese wordings in the file. I have tried to use ObjectOutputStream or DataOutPutStream with method like writeBytes, writeChars or WriteObject, but all are failed to create a ASCII file that can view the Chinese wordings. Although those words can be viewed by using Sytem.out.print().
I think the problem is related to write the result to file or create the file, can any one help?
Thanks
Shek

Hi all
I am now doing a java program to query result from SQL
Server and write the result to a file.
My problem is that our SQL Server stores Chinese
wordings with unicode, after the program query the
result and it fails to write those Chinese wordings in
the file. I have tried to use ObjectOutputStream or
DataOutPutStream with method like writeBytes,
writeChars or WriteObject, but all are failed to
create a ASCII file that can view the Chinese
wordings. Although those words can be viewed by using
Sytem.out.print().
I think the problem is related to write the result to
file or create the file, can any one help?
Thanks
ShekWhich editor are you using to view these files ? It might be possible that not the file but the editor could be the problem.
You might also want to investigate OutputStreamWriter and related classes.

Write To Measurement File Only One Line Of Data

Hello,
I have an express VI setup to acquire a single channel of strain running in a simple while loop. The output is wired directly to a Write To Measurement Express VI. However, the resulting measurement file contains only one line of data.
I have tried changing the settings of the VI to no avail. I feel that I must be missing something basic. My while loop is setup to take one measurement on demand for each loop. I am assuming the VI knows to write each loop as a new line of data?
Thanks for any help,

Did you choose "append to file" in the Express VI configuration settings?
You need to upload your VI for further help. It's impossible to help someone debug a problem without the code to look at.

Write To Measurement File, Comment

I have tried to use the Comment input on a Write To Measurement File vi and the results are not what I expected. What I want to do is place one line of text appended after a block of data to form an easily seen break between the data sets. The data is triggered in a stream prior to being sent to the Write To Measurement File. I thought that the description on the Comment would do this but I get the comment not only between the blocks but also interspersed within the data stream in a seemingly random manner. What am I missing in the behavior of the Comment input?

Dear ITElearner,
thank you so much for your post on our webforum. You are able to add a comment each time you write to the lvm file; this comment will be added to the first row you are writing. I created an example; 10 samples are generated, comment is added, this is written to file, another 10 samples are generated new comment is added and written to file.
Is this what you are trying to achieve? Else I would recommend to create a small example of your problem.
Best regards,
Martijn S
Applications Engineer
NI Netherlands
Attachments:
commentlvm.jpg ‏120 KB
Untitled 1.vi ‏112 KB

Write to measurement file loses timestamp data in tdms format

Hello all, I'm using the Write to Measurement File expressVI and I have created a loop in order to be able to individually label the column headers for each data signal that I'm writing. However, while the loop is successful in doing this the resulting TDMS file that the expressVI creates ends up losing the timestamp data that is used to record the time for each row and just writes a '0' instead. The timestamp data is present before the loop that adds column headers, which I have verified by adding an expressVI just before the loop. Please see the attached code for clarification.
How do I regain the timestamp info after the for loop executes and adds column header info? Thank you.
Attachments:
Write to measurement file specify column name.vi ‏106 KB

The problem with Express VIs and with the Dynamic Data wire is that they (almost) complete obscure what is being done "under the covers". They manipulate data in ways that are unseen and often unexpected. While they allow beginners to do extremely simple tasks quickly, they can easily lead to situations such as you are discovering.
If what you want to do is to write a TDMS data file, you should probably investigate the TDMS functions on the File I/O palette. I've not used TDMS myself, but I know there are examples and documentation in the LabVIEW Help. I suspect that if you do go with straight TDMS, you will probably save yourself further problems by not bundling your four inputs into a Dynamic Wire, but making them a 1D Array (or possibly a Cluster).
Bob Schor

File problems

hi,
I have this simple program for creating and wrting in a sequential file
import java.io.*;
class TestFileOutputStream {
public static void main (String arg[]) throws IOException {
//set up file and stream
File outFile = new File("sample1.data");
FileOutputStream outStream = new FileOutputStream(outFile);
//data to output
byte[] byteArray = {10, 20, 30, 40, 50, 60, 70, 80};
//write data to the stream
outStream.write(byteArray);
//output done, so close the stream
outStream.close();
}//main
}//TestFileOutputStream
/code]
It's not actually my program, I took it from the net but I'm using the same idea for another program and I implemented it in JCretor with j2se1.4.2:
I get the error:
"cannot resolve constructor File(java.lang.String)"
and
"cannot resolve constructor FileOutputSteam(File)"
which is really strange since the java documentation says that the constructor is exactly like that.
Can anybody define the problem
thank you,
Octavian

I think the problem is from jCreator or something 'cause I tried it on the MS-DOS and it worked. I tried my version of the program, doesn't work though. Gives me an error when I try to write a record to a file.
This is the code, mosts classes are for the form and the listeners but I have a class the implements Serializable and the listner that writes to the file. It always gives me an exception.
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//import java.io.Serializable;
public class BizCard extends JFrame
     JButton add;
     JTextField title;
     JTextField name;
     JTextField position;
     JTextField tel1;
     JTextField tel2;
     JTextField email;
     JTextField site;
     File file;
     ObjectOutputStream output;
     public BizCard()
          Container container = getContentPane();
          container.setLayout(new FlowLayout());
               title = new JTextField(30);
          add = new JButton("ADD");
          container.add(title);
          container.add(add);
          setSize(400,400);
          setVisible(true);
          ButtonListener buttonListener = new ButtonListener();
           add.addActionListener(buttonListener);
     private class Card implements Serializable
          private String cardTitle;
          public void setTitle(String newTitle)
               cardTitle = newTitle;
          public String getTitle()
               return cardTitle;
     private class ButtonListener implements ActionListener
          public void actionPerformed(ActionEvent e)
               Card record = new Card();
               record.setTitle(title.toString());
          //     String fileName = "card.dat";
               /*JFileChooser fileChooser = new JFileChooser();
               fileChooser.setFileSelectionMode (JFileChooser.FILES_ONLY);
               int result = fileChooser.showSaveDialog(BizCard.this);
               if (result == JFileChooser.CANCEL_OPTION)
                    return;
               File file = fileChooser.getSelectedFile();
           File file = new File("card.dat");
               try
                    FileOutputStream fileOut = new FileOutputStream(file);
               //     file = new File("card.dat");
                    output = new ObjectOutputStream(fileOut);
                    output.writeObject(record);
                    output.flush();
                    output.close();
               catch(IOException ioException)
                    JOptionPane.showMessageDialog(BizCard.this, "Error Opening File");
               //add files here
     public static void main(String []args)
          BizCard biz = new BizCard();
          biz.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
}I'll keep working on it and try to find a solution

Write to excel file slows down reading voltage channels

Hi all,
I read in input voltage data using PCI 6143 throught finite sampling. This VI is supposed to, for example, after acquiring 240 samples, I write all collected voltages to an excel file. Before I write the data into excel, I need to re-arrange the data array. This re-arranging task takes up quite a significant amount of time (about ~30ms). Hence, the 2nd batch of 240 samples collected is only done after arranging data and writing to file.
Hence the process will be like, 0.9milli sec of data, wait 30milli sec, 0.9milli sec of data, wait 30milli sec and so on.
So is it possible to pass this huge chunk of data to another VI, specifically doing the data manipulation and writing to file while the main VI continue collecting the voltage data without data losses?
Does anyone have any suggestion by which mean am I able to do this?
I saw a nice example in LV 7.1 example finder-> optimizing applications synchronizing tasks->Pass Data with Notifiers.vi
Is this notifier method the solution to my problem or is there some other means to achieve the results?
Thanks everybody!
Best regards,
Dick

Hi Dick,
I have some question you set the Sample Mode to Finite samples, why. If you do this you will miss samples!
You start and stop the tasks every iteration, this will cause great wait times
You can move the constat vi's outside the while loops.
If you use continious samples you have to wire up the samples per channel to the ai read vi.
If i profile the VI I see that voltage data-constants takes 3.6 ms of time (average).
Also you should open the file outside the while loop and use the array to to spreadsheet string vi and write to text file to write the data. Successfully close the file after the while loop.
In general opening/starting/closing/ending should not be done inside a repetative loop.
It looks to me that 'voltage data constants.vi' generates an spreadsheet string from the data with a time column added.:
this can be done like this:
EDIT:Also you'r vi will 'remember' all the previous string and adds these together. If you don't want this initialize the shift register with an empty string, i missed the 'firstrun' case, but it is still better to initialize the shift register correctly, or you can connect the iteration number straight to the switch case
Ton
Message Edited by TonP on 09-28-2006 11:34 AM
Message Edited by TonP on 09-28-2006 11:45 AM
Free Code Capture Tool! Version 2.1.3 with comments, web-upload, back-save and snippets!
Nederlandse LabVIEW user groep www.lvug.nl
My LabVIEW Ideas
LabVIEW, programming like it should be!
Attachments:
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Write result to file problem

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