Write to text file formatting questions

Apologies if I am touching on a subject discussed elsewhere. I have two issues, which I believe to be related, that I am having difficulty overcoming. I am collecting voltage date, converting it to a temperature, and then writing the time stamp, temperature, excitation voltage, and original voltage to file. Currently, when I write these values to file the date and time appear on one line, the temperature and voltages appear on the following line, and then there is a space before the pattern repeats. Furthermore, before data is collected I write information to a header, and if you look at the attached .csv file, you'll see that the data is all offset one column to the left. Any ideas how I can solve this problem? My code probably speaks for itself, but I am very much a novice so any general insight in non-jargon terminology will be humbly accepted. Cheers, Peter.
Solved!
Go to Solution.
Attachments:
NI-DAQ_TempString_02b.vi ‏121 KB
test16.txt ‏2 KB

Your problem is where you are building your data line. Why are you using Build Array and then Inster into Array? You don't want arrays when writing to the text file. Each element of an array will be a different line. What you really want is Concatinate String. Use the Concatinate String to build a string with your timestamp, a comma, and your "spreadsheet string" that contains your data.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Similar Messages

Write to text file qeustion

Hello all,
My first question about writing to text file is does the file need to be opened? i know you have the option to create, replace, open..., but does it need to be opened in order to properly write data to the file? Also if my application is running with a disk streaming file setup and i open the file that it is writing to will this cause an error or cause labview to lose control of the file and possibly stop writing to the file?
Thank you,
Matt

Feel free to experiment. Try writing to a file from multiple locations at once, and you'll see race conditions where data could be lost.
The reason for the Open, Write, Close type of software is because generally you are in a loop continually writing to a file, and the extra overhead of a Open and Close can be limited to when the software starts and closes, instead of having to open a new reference and close it every time you want to write to the file. Just open the reference once, work with it in a while loop, then close it once, must more efficient and better for applications that write many times to disk.
Is it necessary? No you can just use the Write to Text file giving it a path and data to write, but behind that function it will need to open and close the reference each time.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

Generate a report in text file format

Hello Experts,
I need to write a program to generate a report in a text file format which is later saved on a directory in the application server. I have the fields with the sources defined and also the filters, selections, rows and columns. For example:-
0company code (US) as the filter, 0CALDAY as the selection, CUSTNAM as the object in the row with sources coming from BUKRS and ZSD_CCUST. Can someone initiate or direct me to an already existing forum or throw some light on the issue.
Thanks,

Hi,
As mentioned above, the Open Hub service allows to extract data from an InfoCube/ODS/InfoObject and then store it a database table or flat file stored in the application server. You can start in transaction RSBO and create an InfoSpoke there.
To schedule an extraction using an InfoSpoke, you need to place it in a process chain.

Write to Text File.vi Output file all but first line start with tab

The attached PNG shows the code used to build up concatenated strings into a string array for the first four lines, thence to a string Array, to Spreadsheet String.vi and, finally, the use of Write to Text File.vi
The lower right corner shows the result loaded into a spreadsheet. Note the 3 blank entries marked by a filled red rectangle. Examination of hidden characters shows there is a tab at the beginning of lines 2, 3 and 4.
There is no tab shown in the code. How do those tabs get there? How do I stop them?
I have tried with the option "Convert EOL" both on and off with no difference.
The Help states that an OS-dependent EOL character is appended to each line. I can't imagine the Windows EOL character includes a tab.
Solved!
Go to Solution.
Attachments:
Tab Mystery.PNG ‏29 KB

wildcatherder wrote:
I am still puzzled as to why those additional tabs were added by Array to Spreadsheet String. I'm holding in my hand a printout of an old LabVIEW 8 program with that construction, which is known to work properly.
Makes complete sense when you look at your code. You build a string, including an end-of-line character, and put that string into an array. Then, when you run it through Array to Spreadsheet String, it puts a tab after every array element, and new line at the end of each row in the array. The first element of your array contains a new line but Array to Spreadsheet String doesn't know about it; it still inserts a tab between that array element and the next one, giving you the tabs.

How can we generate the reports in html or text file formats?

Hi,
Is there any package that can help in creating HTMLDB reports in .txt files or .html files? (Similar to TEXT_IO in Oracle Forms)
How can we generate the reports in html or text file formats from HTMLDB?
Thanks in Advance
Renjith

Hello all.
Bi Publisher is great, but has a very high price tag. It's even more expensive than Forms & Reports Services. We are considering APEX to replace Forms & Reports on the web, but the reporting limitations are still a problem.
I wonder if there is another option.
Thanks

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.

Write to text file. Append to existing file. Create file if file doesn't exist.

Hi folks,
up to LabVIEW 7 there was a wonderful "Write to Text File" vi which allowed the option "Append to File". Now, in LabVIEW 8, this old vi is not longer supported anymore. Instead, I am suggested to use a new "Write to Text File" vi. This vi does not offer the option "Append to File" anymore. Rather it is proposed in the online help that one should use the "Set File Position" in order to append text to the file. This much less straightforward than the old solution. Furthermore, I miss an option which would create the complete path if it doesn't exist yet.
To summarize: Isn't there really any smart "Write to Text File" vi available which offers both the options "Append" and "Create path if file does not yet exist". Of course, I could write such a file on my own but I am sure that it is of such general interest that it already exist. In any situation, when a log file shall be written, the wanted vi would be ideal.
Thanks a lot,
Peter

Ray,
I know that the old vi is still available. See the screenshot which I attach to this message. What I am missing is an option "Create file or even complete path if file or path do not yet exist.". Is there any reason why NI doesn't provide neither this option nor a simple "Append to file" functionality in the new "Write to Text File" vi?
Regards,
Peter
Attachments:
Clipboard01.png ‏7 KB

Write to text file returns no error even if the underlying file is deleted

Hi,
I'm using a CompactRIO and writing to a text file underneath the C drive.
I'm running into an unexpected situation when I am trying to error check my file handling. I assumed that if the underlying file being written to that was created by open/create/replace vi and written to with the "Write to Text File" vi, would return an error if I delete the file from underneath it in the file system., yet there is no reported error and the function carrys on seemingly successfully writing to a file that has been deleted.
Anyone know why this happens and how to potentiallly remedy?

Ouch, this obviously isn't ideal but is probably down to the filesystem on the CompactRIO.
I would consider putting in a check - doing something like getting the file position from the file might return an error if the file no longer exists.
Certified LabVIEW Architect, Certified TestStand Developer
NI Days (and A&DF): 2010, 2011, 2013, 2014
NI Week: 2012, 2014
Knowledgeable in all things Giant Tetris and WebSockets

"Write to text file" when button is pushed?

I want to use the function "write to text file" when a button is pushed, and write only once.
The same goes for "read from text file

Hello!
Look at the following examples shipped with LabVIEW Professional and LabVIEW Full. Event structure example is not installed with Base package.
Open up 'Example Finder', click on the 'Search' tab, enter keyword 'events' and you fill find several examples. The ones of interest for you is 'New Event Handler.VI" and 'Old Event Handler.VI', where the first uses the event structure and the other uses the standard state machine architecture.
Regards,
Jimmie Adolph
Systems Engineer Manager, National Instruments Northern Region
Bring Me The Horizon - Sempiternal

Write to Text File - unflatten channel string

Hi all,
This is my first post on the forums! It's been very helpful for me but I have not been able to find a solution to my (simple) problem.
Operating system: Windows 7 (64-bit)
Labview 2012 Full Development
I'm using the DAQmx unflatten channel string to get the names of the channels, and when I Write to Text File, I get the names of channels to be displayed vertically, ie a new row for each channel in a column. I'd like to "transpose" this, but obviously you cannot transpose a 1d array. Any ideas on how I can do this?
Any and all ideas are appreciate, thank you in advance,
-AK
Solved!
Go to Solution.

Show us how you are doing this.
My guess is that once you get the data, you have linefeed characters separating the channel names rather than some other delimiter such as a comma or a tab.
Depedning on how you are going from the channel names to the file (a string, an array of strings, Write to Spreadsheet File, Write to Text file, ....) will determine the best way to fix the problem for you.

Write to text file (including spaces/next line) using oracle??

How to write to text file using oracle? And how do I handle spaces/next line? (i was trying to use spaces(ch(32)), however it is just converted into squares in the text file.) thanks!

989873 wrote:
How about tabs?It does not matter what character it is. UTL_FILE deals correctly with any text file. Tabb is CHR(9):
SQL> declare
2       v_file utl_file.file_type;
3       v_total_rec number := 0;
4       v_total_sal number := 0;
5 begin
6      v_file := UTL_FILE.FOPEN('TEMP','TEST.TXT','w');
7      for v_rec in (select * from emp) loop
8        v_total_rec := v_total_rec + 1;
9        v_total_sal := v_total_sal + v_rec.sal;
10        UTL_FILE.PUT_LINE(
11                          v_file,
12                          lpad(v_rec.deptno,2) || chr(9) || rpad(v_rec.ename,14) || chr(9) || to_char(v_rec.sal,'99999D99')
13                         );
14      end loop;
15      UTL_FILE.PUT_LINE(v_file,'Total Salary:' || chr(9) || v_total_sal);
16      UTL_FILE.PUT_LINE(v_file,'Total Records:' || chr(9) || v_total_rec);
17      UTL_FILE.FCLOSE(v_file);
18 end;
19 /
PL/SQL procedure successfully completed.
SQL> declare
2       v_file utl_file.file_type;
3       v_line varchar2(100);
4 begin
5      v_file := UTL_FILE.FOPEN('TEMP','TEST.TXT','r');
6      loop
7        UTL_FILE.GET_LINE(v_file,v_line);
8        DBMS_OUTPUT.PUT_LINE(v_line);
9      end loop;
10    exception
11      when no_data_found
12        then
13          UTL_FILE.FCLOSE(v_file);
14 end;
15 /
20      SMITH              800.00
30      ALLEN             1600.00
30      WARD              1250.00
20      JONES             2975.00
30      MARTIN            1250.00
30      BLAKE             2850.00
10      CLARK             2450.00
20      SCOTT             3000.00
10      KING              5000.00
30      TURNER            1500.00
20      ADAMS             1100.00
30      JAMES              950.00
20      FORD              3000.00
10      MILLER            1300.00
Total Salary:   29025
Total Records: 14
PL/SQL procedure successfully completed.
SQL>SY.

Write to text file while scrolling table issue

Hi all,
I have a LabVIEW application that logs data using 'write to text file' every second. This is a bckground task in a sub-VI. On the main screen I have several tables that have scrollbars. Every time the file is written the scrolling of a table is effectivley canceled. It is then necessary to click on the scrollbar again to re-start scrolling the table. I guess this is an issue with the OS but not sure yet. I have not tested other operating systems yet. I thought I would try the forum first. Has anyone else experienced this issue? Any ideas on how to fix this?
I have tried using list boxes instead of tables but the same issue exists.
I'm using windows 7 and LabVIEW 2011.
Thank you.
Certified LabVIEW Architect

Hi Steve, thanks for offering to help. Right now I'm on a machine with LabVIEW 2010 and XP and the issue does not exist. But I have created a little test VI that should demonstrate the issue once running on LabVIEW 2011 SP1 and Windows 7. I can't confirm this VI will demonstrate the issue until later today when I can test it on the problem system myself. Feel free to give it a go and let us know what you find, or wait until I confirm the attached VI will demonsrate the issue (10 to 12 hrs time).
Thank again.
Certified LabVIEW Architect
Attachments:
Table scroll test_1.vi ‏13 KB

Write a text file on client

I want to realise an applet which can write a text file on client. I use java 2 and an certified applet.
I'm searching a script.
If you have a solution or a script thank you.
A+
Ps: I'm french and sorry for my english

FileOutputStream fos = new FileOutputStream(filname);
DataOutputStream dos = new DataOutputStream(fos);
try {
dos.writeBytes("some string");
} catch (Exception e) {
out.println(e.toString());
dos.close();
fos.close();

From PLSQL - Need to write a text file

Hello
I need to write a text file from data retrieved from many tables in PLSQL to the UNIX box.
Thanks
Paul
null

You can use package UTL_FILE to write out to a file. Your DBA has to make initialization changes to support this. They might already have it setup. Run this query:
SELECT value
FROM v$parameter
WHERE name = 'utl_file_dir';
To see whether it has been configured properly. The value is the directory where you can create and write files.
null

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 text file formatting questions

Similar Messages

Maybe you are looking for