f

#### Remove extra file contents / Set End of File

Hello All;
&nbsp;
I have an application which needs to read and write to/from text files.&nbsp; The Config VIs do not give me what I need, and so I am using the File I/O (Open File, Close File, Read Text File, Write Text File) and Adv File Functions (Set File Position).&nbsp; My general flow is this:
&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp; Open File --&gt; Read from Text File (Use Spreadsheet String to Array to itemise everything) --&gt; Manipulate the String Array --&gt; Set File Position = 0 from Start --&gt; Write to Text File --&gt; Close File
&nbsp;
Having said that, if my reworked string array is shorter (i.e. smaller index) than my original, when I write to file, not everything is replaced.&nbsp; Basically, it only replaces the exact number of characters, if you will, that it needs to.&nbsp; See attached text example (in this case, the !end is listed twice...)...
&nbsp;
Is there a way to set the End of File (eof) such that the file ends immediately after I write information?&nbsp; Is there a way to "empty" the file immediately before writing?&nbsp; I suppose an alternative would be to write to a temporary file, and replace the original file with the (slightly smaller) temporary file, but I'd rather only use the single file (if possible).
&nbsp;
Anyway, any help would be appreciated!
&nbsp;
D. J. Hanna

Default.txt:
http://forums.ni.com/attachments/ni/170/282115/1/Default.txt

 0
x9561 (148440)
11/2/2007 6:40:05 PM
comp.lang.labview 35213 articles. 1 followers. vasusachin24 (1) is leader.

0 Replies
581 Views

Similar Articles

[PageSpeed] 54

Similar Artilces:

how to append contents to an existing file contents at the end of file?
Hi all &nbsp; I am Kiran, working with LV8.0&nbsp; FDS &nbsp; I find difficulty while trying to add new file contents(some messages) &nbsp;to an existing file at the end /begining of a file. &nbsp; Whenever i try to do that,it is replacing the previous contents,but i dont need that. i want the contents to be appended. &nbsp; Plz suggest me. &nbsp; thanks &amp; regards &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; kiran ...

how to make a file from the strings in a file and redirect the content to these new files
Here is scenari0 223 files copied to this this one big flat file. now how to make this file to 223 files. further explaination: below is excerpt from that one file under xxxxx you will see @TC_ID: :BIC4007 then another @TC_ID: :BIC40008 and has a 223 time with TC_ID: :BICxxx numbers How do I use such a script that makes a file named BIC40008, then another BIC40007 AND copying the content from line @TC_ID: :BIC40007 till one line before the next TC_ID: :BIC40008 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx @TC_ID: :BIC40007 @TC_TITLE: @ACT_IDS: @AUTHOR: @AUTO: @CLASS: @GROUP_ID: @RELEASES: @T...

Generic file I/O error, the file is not a valid labview file
Hi, &nbsp; I have created a project in LV 8.0. Now I am&nbsp;getting the following error when I try to open it...'Generic file I/O error, the file xxxxx.vi is not a valid labview file.' I have tried to open all the subvi's used in my application and I am able to open all of them. I found that this condition may occur if the hard disk is full. So I tried to open my vi from another PC but I am getting the same error everywhere. What am I supposed&nbsp; to do ?? Please help me out if anyone has a solution to this... &nbsp; Regards, Divya Hi Mike... Thank you for your reply... I get this error when opening the main vi in my application. I can't recall anything which may have corrupted the file. The earlier version of the main vi of which I had saved&nbsp;a copy does not give any problems while opening.&nbsp;I had made many changes in the next version of my application which is lost now... Do you think that the file may be corrupted? Is there no way to retrieve it? I do have a system&nbsp;running LabView 8.2 and I have tried to open this file with that version. But I am still getting the same error. DivyaMessage Edited by divya on 03-22-2007 10:42 PM Hi Divya, Check if the VI's size is &gt; the one U re stating as Ur earlier version, without that so many changes. If it &gt;, it may not ve got corrupted. Problem could be something else. Else, if it shows some drastically low size ( like too less kb ), then it has got goof...

How to rename files and contents of the file
Hi, I have two files XYZ_INPUT_FILE_ABCD.YYYYMMDD XYZ_INPUT_CONTROL_ABCD.YYYYMMDD In Shell script i have to change the character "_" before ABCD wit dot(.) It should be like this XYZ_INPUT_FILE.ABCD.YYYYMMDD XYZ_INPUT_CONTROL.ABCD.YYYYMMDD and also inside the second file XYZ_INPUT_CONTROL_ABCD.YYYYMMDD th first file name (XYZ_INPUT_FILE_ABCD.YYYYMMDD) is present. So i have t change the character "_" before ABCD with dot(.) Could you please help me out on this. I appreciate your help i advance. Thanks Chinn -- chinn --------------------------------------------------...

LabView 7.1 adds an extra column to the end of files
When I use the Write File.vi or the Write to Spreadsheet File.vi, LabVIEW adds an extra column of zeros at the end. It did not do this in Labview 6.1 Why does it do this and is there any way to tell it not to do this as it messes up the alignment of my data. This has probably something to do with extra chars at the end of your strings. Have a look <a href="http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=313&HOID=506500000008000000488E0000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0">here</a>. If this doesn't solve your problem, post a cop...

file extention from file file location

FAT32 file system
Hi, I am looking for information on how to add and remove files from a fat32 file system. Specifically the pseudo mechanics not actual code. I have some idea, but I'm not sure if this is the optimum way. For adding I am assuming the following steps: 1) add the file entry to the directory. Do I find the first available entry (0x00) or can I replace a deleted directory entry (0xE5)? 2) Find an available cluster in the FAT Table. Do I search for the first available entry location that is set to 0x00000000? 3) Break up the file data among clusters and update the FAT entries, and set...

How to set path for .M files. How to include, and verify a file in the MATLAB path. In other words I wish to learn how to setup the path for .M file in MATLAB path? Thanks.
undefined ...

How to set path for .M files. How to include, and verify a file in the MATLAB path. In other words I wish to learn how to setup the path for .M file in MATLAB path? Thanks. #2
undefined ...

Random file in a file
I am trying to take a random file from a folder what can I do to get random to find a file but not numbers? On Tue, 20 Oct 2015 19:24:03 +0000, Baldvin Vigfússon wrote: > I am trying to take a random file from a folder what can I do to get > random to find a file but not numbers? You could get a list of files in the folder, generate a random integer between 1 and the number of files, then use that RN to index the file list. Bruce ...

remove NEWLINE at the end of the file
i use the code below to read a text file. try { BufferedReader in = new BufferedReader(new FileReader("infilename")); String str; while ((str = in.readLine()) != null) { process(str); } in.close(); } catch (IOException e) { } but when the file has a NEWLINE at the END ....the code also read that. i just dont want to read that NEWLINE as soon as i come to the end. what i have to do ? On 3 Apr 2006 19:05:04 -0700, "gk" <srcjnu@gmail.com> wrote, quoted or indirectly quoted someone who said : >bu...

How to find New File,Write file and close file?
Hi Anyone can show me how to find New File,Write File and close file in block diagram.The picture of file names are as show in pics. Thanks &nbsp; Nyan Lin File find.JPG: http://forums.ni.com/attachments/ni/170/322096/1/File find.JPG Hi. The functions You're looking for are under "File I/O --&gt; Advanced File Functions" (At least the NEW File) The 2 others are in the "File I/O" menu on the functions palette. Good luck.Message Edited by BCL@Servodan on 05-08-2008 03:38 AM Hi I can't find&nbsp; my files at Advanced file functions that which u say.. I am using LabVIEW PDA Module Version 8.5.So is there any concern with version? &nbsp; Thanks for ur reply Best Regards NyanLin Dear <a href="mailto:BCL@Servo" target="_blank">BCL@Servo</a>, Please give a screenshot. &nbsp; Thanks, Mathan Hi again. My mistake. I was looking in my LabView7. In 8.5.1 the Icons have changed........ I cannot give a screenshot of the 8.5.1, as it is on&nbsp;another PC, but the function is called Open/Create/Replace File, Write text to file and Close file. They are in the "Programming --&gt; File I/O" palette. Sorry for the inconvienience. &nbsp; Here a screenshot in LV8.5 of what <a href="mailto:BCL@Servo" target="_blank">BCL@Servo</a> told. Right click anywhere on block diagram window, click on the Floppy symbol in programming menu named File I/O. there everyt...

Web resources about - Remove extra file contents / Set End of File - comp.lang.labview

Help:Contents - Wikipedia, the free encyclopedia
Templates are special pages that contain boilerplate text intended to be displayed on more than one page in Wikipedia. This Tip of the day box ...

Portal:Contents/Culture and the arts - Wikipedia, the free encyclopedia
The word culture is derived from the Latin root cultura or cultus meaning to "inhabit, cultivate, or honour". In general, culture refers to human ...

Safe Schools: George Christensen welcomes 'gutting' of 'bad content' in anti-bullying program
The Federal Government orders changes to the Safe Schools anti-bullying program following a review and a rebellion by backbench MPs.

Instagram to soon start showing content out of order and based on personalized algorithms
Following in the footsteps of Facebook, Instagram today announced in a blog post that it will soon adjust the way in which content is presented ...

Like Peanut Butter And Jelly: Why kCura Bought Content Analyst
As far as kCura is concerned, analytics represents a fast growing part of its business.

Tencent's Profit Misses Estimates as Video Content Costs Climb
Bloomberg Tencent's Profit Misses Estimates as Video Content Costs Climb Bloomberg Tencent Holdings Ltd. posted fourth-quarter profit that ...

Tribeca Film Fest Adds Digital & Online Content To Its Market Mix
... (TFF) today announced the inaugural Tribeca Digital Creators Market and Special Screenings program. A marketplace for digital and online content ...