How do I read a text file line by line and store to array

I have a text file, I want to be able to store each line of the file in an array, how would I go about doing this? code example? tutorial? Thank you

Well, you got the pseudo code:
a) read line
b) add to array
So whats the problem? What don't you know how to do?
What does your text book tell you about reading files. I'm sure it has an example, every book I've read does.
By the way I would use an ArrayList to store each line of text, that way you don't need to know in advance.

Similar Messages

How to scan/ read a text file, pick up only lines you wanted.

I'm new to Labview, I trying to wire a VI which can read a text file
example below:
Example: My Text File:
1 abcd
2 efgh
8 aaaa
1 uuuu
and pick out only any line which start with number 1 (i.e 1 abcd)
then output these 2 lines out to a a new text file?
Thanks,
Palmtree

Hi,
How do you creat your text files? Depending on the programm, there is added characters in the beginning and at the and of the file. So here you will find a VI to creat "raw" text files.
To debug your VIs, use the probs and breakpoints, so you can solve the problem by your self or give an more accurate description of it.
There is also the VI that read a integer and two strings (%d %s %s)
Attachments:
creat text file.vi ‏9 KB
read_from_file.vi ‏14 KB

How to i read multiple text files one bye one

hi all
I need to select the text files multiple times and read files one by one
some how i managed to select the one text file and scan the data in the text file
i need to do this for mutiple files at the same time
please help me
Solved!
Go to Solution.

gowthamggk wrote:
i sucessfully reading one text file through this VI
but as like this .. i need for multiple files
Why are you not using For loop???
gowthamggk wrote:
also shld read the text line by line
You can right click the 'Read from Text File' function and select 'Read Lines'. Refer to below code snippet.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

How do I read a text file in a Jar Executable?

Hello All,
I have a need to package a text file into a Jar Exectable file and then have my java code read that text file in using a BufferedReader. Can anyone out there tell me how to do this? My first question is how do I reference this file by the path name? O, I'm also using Windows.
Thanks for your help.
Karl

I have the same problem with kportner . I did by joop_eggen but I got the error at:
BufferedReader in = new InputStreamReader(is);Can't conver from BufferedReader to InputStreamReader
When I up my applet to server and get it from client. My applet couldn't read the text file.
Any one help me!
Thanks.

How can I read a text file inside the .xsjs?

I need to read line by line of a text file just like FileReader and BufferedReader in Java. It contains a script SQL to insert data in my DB. Can I use some API?

There is no API that allows you to access the file system of the server in XSJS. You would need to upload the file from the client side and it will appear as a array buffer in the request object. From there you can convert the array buffer to a string and process however you like.
For example:
var content = "";
    content = $.request.body.asArrayBuffer();
    var array = new Uint8Array(content);
    var encodedString = String.fromCharCode.apply(null,array),
         decodedString = decodeURIComponent(escape(encodedString));
        content = decodedString;
    var lines = content.split(/\r\n|\n/);

How can I read a text file??

Hi every body, does any boody has a code for read a text file and show this text in a JTextArea??? I'm trying with a FileReader but the text doesn't appear well.
Thanks in advance.
Juan

File f = new File("file.txt");
try
LineNumberReader inputFile = new LineNumberReader(new FileReader(f));
while((line = inputFile.readLine()) != null)
results += line + "\r\n";
inputFile.close();
catch(Exception ex)
System.err.println("Exception caught " + ex);
ex.printStackTrace();
area.setText(results); //textarea declared somewhere else

How can I read only text files in a directory.

I've written a program to read files in a directory but I'd like for it to only read the text files of that directory.
import java.io.*;
public class Data {
public static void main(String[] args) throws IOException {
String target_dir = "C:\\files";
File dir = new File(target_dir);
File[] files = dir.listFiles();
for (File textfiles : files) {
if (textfiles.isFile()) {
BufferedReader inputStream = null;
try {
inputStream = new BufferedReader(new FileReader(textfiles));
String line;
while ((line = inputStream.readLine()) != null) {
System.out.println(line);
} finally {
if (inputStream != null) {
inputStream.close();

You have mentioned you want to read only text files.
If you are referring to some specific set of extentions, you can filter based on that.
ex: you want to read only .txt files, you can add an if condition as below :
if(textfiles.getName().endsWith(".txt")) {
// Add your code here
Cheers
AJ

How can i read the text files and buffer the data in Vector?

hi. I have been running into this problem for days, but with no luck and losing right direction.
The problem is : I am trying to read a text file and buffer the data into a
Queue for each user.
the sample text file is as below:( 1st column is timestamp, 2nd is user_id, 3rd is packet_id, 4th is packet_seqno, 5th is packet_size)
0 1 1 1 512
1 2 1 2 512
2 3 1 3 512
3 4 1 4 512
4 5 1 5 512
5 6 1 6 512
6 7 1 7 512
7 8 1 8 512
8 9 1 9 512
9 10 1 10 512
10 1 2 11 512
11 2 2 12 512
12 3 2 13 512
13 4 2 14 512
14 5 2 15 512
15 6 2 16 512
16 7 2 17 512
17 8 2 18 512
18 9 2 19 512
19 10 2 20 512
20 1 3 21 512
21 2 3 22 512
22 3 3 23 512
23 4 3 24 512
24 5 3 25 512
25 6 3 26 512
26 7 3 27 512
27 8 3 28 512
28 9 3 29 512
29 10 3 30 512
30 1 4 31 512
31 2 4 32 512
32 3 4 33 512
33 4 4 34 512
34 5 4 35 512
35 6 4 36 512
36 7 4 37 512
37 8 4 38 512
38 9 4 39 512
39 10 4 40 512
40 1 5 41 512
41 2 5 42 512
42 3 5 43 512
43 4 5 44 512
44 5 5 45 512
45 6 5 46 512
46 7 5 47 512
47 8 5 48 512
48 9 5 49 512
49 10 5 50 512
50 1 6 51 512
51 2 6 52 512
52 3 6 53 512
53 4 6 54 512
54 5 6 55 512
55 6 6 56 512
56 7 6 57 512
57 8 6 58 512
58 9 6 59 512
59 10 6 60 512
60 1 7 61 512
61 2 7 62 512
62 3 7 63 512
63 4 7 64 512
64 5 7 65 512
65 6 7 66 512
66 7 7 67 512
67 8 7 68 512
68 9 7 69 512
69 10 7 70 512
70 1 8 71 512
71 2 8 72 512
What I wanna do is to read all the data above and buffer them in a queue for each user( there are only 10 users in total).
I already created a class called Class packet:
public class packet {
    private int timestamp;
    private int user_id;
    private int packet_id;
    private int packet_seqno;
    private int packet_size;
    /** Creates a new instance of packet */
    public packet(int timestamp,int user_id, int packet_id,int packet_seqno, int packet_size)
        this.timestamp = timestamp;
        this.user_id=user_id;
        this.packet_id=packet_id;
        this.packet_seqno=packet_seqno;
        this.packet_size=packet_size;
}then I wanna to create another Class called Class user which I can create a queue for each user (10 users in total) to store type packet information. the queue for each user will be in the order by timestamp.
any idea and sample code will be appreciated.

Doesn't sound too hard to me. Your class User (the convention says to capitalize class names) will have an ArrayList or Vector in it to represent the queue, and a method to store a Packet object into the List. An array or ArrayList or Vector will hold the 10 user objects. You will find the right user object from packet.user_id and call the method.
Please try to write some code yourself. You won't learn anything from having someone else write it for you. Look at sample code using ArrayList and Vector, there's plenty out there. Post in the forum again if your code turns out not to behave.

How do i read a text file and then display the content as a string

I also would like to strip the string from a certain substring and convert the remaining string into an array of floating point numbers. I was thinking of using the read from spreadsheet vi but I'm not exactly sure if that is going to work. Any help would be greatly appreciated.
Solved!
Go to Solution.

Here is what I have so far. What I am trying to do is to display the text file as a string and then strip the "curve" from the text file. I think I did this successfully. Now I want to convert the remaining string into an array of floating point numbers, and display the numbers into an array and on a waveform graph.
Attachments:
hw3datafile.txt ‏1 KB
Q4.vi ‏7 KB

How to I read a text file attachment in email on my playbook

I can read it on my black berry smartphone, I have a program that will read text files but it can not see into wherever email attachments are saved.
I get log files in emails and the phone screen is a bit small to read them so I would like to use my playbook.
Any ideas.

Attachments are saved in your downloads folder:
/accounts/1000/shared/downloads
You might like to try Files & Folders, which gives you access to that folder and has a built-in text viewer.
Files & Folders, the unified file & cloud manager for PlayBook and BB10 with SkyDrive, SugarSync, Box, Dropbox, Google Drive, Google Docs. Free 3-day trial! - Jon Webb - Innovatology - Utrecht, Netherlands

How do I read a word file with Report Generation and Labview?

Hello All:
I have Labview 2010.
How do I Read a Microsoft Word File1.doc with Labview and Report Generation Kit?
File1.doc is a simple file with a few lines and a Table.
thank you very much.
\\diego2000

I don't think that toolkit will help you. Remember, it's the Report GENERATION Toolkit. It's designed to create reports not read existing DOCs.
You can use the standard file VIs to read a Word Doc but you'll have to strip out the formatting information to get at the raw text.
There may be some other tools or ActiveX techniques that will help. Hopefully someone more knowledgable on that subject will chime in to help you out...
Using LabVIEW: 7.1.1, 8.5.1 & 2013

How to read a text file from a Jar file

Hi
How can I read a text file from a Jar file?
Thanx in advance..

thanx
helloWorld it works.damn, I didn't remove it fast enough. Even if it is urgent, it is best not to mention it, telling people just makes them take longer.

Reading a text file from a remote host. Authentication required.

Hi frnds,
I have to read a text file "config.txt" from a remote host "HOSTNAME". File is shared in a folder - "FOLDER" .
If the folder is shared with no password protection then it works. But if the folder is password protected the code is unable to read the file.
I know the UserName and PassWord of the shared folder. How to code for this.
I don't want to share the Folder to everyone without a password.
Kindly Help.
try {
FileReader fr=new FileReader("\\\\HostName\\folder\\config.txt");
BufferedReader br=new BufferedReader(fr);
String s=null;
while((s=br.readLine())!=null)
/* One line is read */
fr.close();
catch(Exception e)
throw new Exception("Exception in ConfigConstants."+e.toString());
urs
Mishra

ok.. let me define it clearly...
By using ftp as a protocol how can I read a text file
in remote machine........ kindly do reply....Have a look at this article:
http://www.javaworld.com/javaworld/jw-04-2003/jw-0404-ftp.html
and what are the prerequisities that are needed for
such a type of operation.....(At least) an FTP server should be running on the machine where the text file resides.
Message was edited by:
prometheuzz
Oh, you should have your keyboard fixed: the full stop key seems to be stuck, you have a lot of trailing ..... after each sentence.

Reading a Text file in Procedure

Hello,
How do I read a Text file in reverse direction in PL/SQL Procedure. Every time I want to read last line in the file.
Can I read last line without going through whole file?
Thanks
Sameer

use utl_file.fopen() in read mode
and then use utl_file.get_line()
you cannot directly read the last line in a file. you have to achive this programtically.
null

Read a text file from DB directly (don't use PLSQL).

how can I Read a text file from DB directly (don’t use PLSQL). ?

If there is a known structure, you could use External Table access and query that "file" as any table.
Nicolas.

How do I read a text file line by line and store to array

Similar Messages

Maybe you are looking for