How to read one bye at a time

i need to read one byte at a time from a input file. can someone tell me how to do that?

FileInputStream istream = new FileInputStream(myFile);
int read_byte = istream.read();API doc work wonders on issues like that

Similar Messages

  • Reading one character at a time

    Hello
    How can i read one character at a time from standard input (System.in) ?
    I have tried to use
    ir=new InputStreamReader(System.in)
    ir.read().
    But this method blocks until it gets a return key pressed before going forward
    Any other solution?

    public static char readChar() {
    int ch;
    char r = '\0';
    boolean done = false;
    while (!done) {
    try {
    ch = System.in.read();
    r = (char) ch;
    if (r == '\r') {
    System.out.println("Not a character. Please try again!");
    System.in.skip(1);
    done = false;
    } else {
    System.in.skip(2);
    done = true;
    } catch (java.io.IOException e) {
    done = true;
    return r;
    Try this as an method and then use it..
    This code will read will be in response untill you hit the return key but will take only the first character....

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  • Read one record at a time

    Hi !
    One of our Java folks here need at function where he reads one record at at time in id order;
    create table url_recs (id number, url varchar2(4000));
    insert into url_recs values(1,'www.fona.dk');
    insert into url_recs values(2,'www.dr.dk');
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    select read_rec() from dual; - get id 1
    select read_rec() from dual; - get id 2
    select read_rec() from dual; - get id 17
    select read_rec() from dual; - get id 1 - "no more rows - start all over again)
    select read_rec(45) from dual; - get NULL (no rows with that id)
    select read_rec(1) from dual; - get id 1
    The purpose id for some "round robin" trying to get to some internal URL's.
    Can you give me a hint for creating the function(s)
    best regards
    Mette

    Will successive calls come on the same Oracle session? Or across different Oracle sessions?
    If you're going to call the function multiple times within the same Oracle session, you could store the last value returned in a package variable and select the record whose ID is greater than that value every time the function is called. That's unlikely to do exactly what the Java developer is hoping, though, because the Java calls are likely to bounce between multiple Oracle sessions due to connection pooling. And it'll likely require that the Java developer (or app server admin) adds some code when they get a connection from the pool where they reset the package state. Or it'll require that someone develop a method to keep the Java and Oracle session state in sync.
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  • Read one word at a time from a text file

    I want to read one word at a time from a text file as it is done by "scanf &s" function in text based programme. It is not possible by " read from text"  function. Suggest me  function or method to solve this.

    The simplest way is to use the spreadsheet string to array function with the space character as the delimiter.
    Note that this won't work unless there is a space character between the words - it won't work with line feeds / carriage returns between the words but you could always split the string into lines first. You may also want to trim whitespace to remove any other non-visible characters (e.g. tab, line feeds) from around the word.
    If you need something more sophisticated that splits based on whitespace (e.g. tab, new line) then you'll probably need to do something with searching the string for these characters (e.g. using a regular expression) and then splitting them yourself into an array.
    Of course...if you actually want to just read one word at a time from the file rather than just split the file into words (I assumed you meant this), you will need to read the file byte by byte using the low level file IO functions, build a buffer of the bytes and check the character you've read to see if it a space.
    Certified LabVIEW Architect, Certified TestStand Developer
    NI Days (and A&DF): 2010, 2011, 2013, 2014
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  • Reading one file at a time using File Adapter

    I am using a File Adapter which polls every minute to read files from a Folder. This process picks up all the files in that folder. What I want to achieve is that the File Adapter should read one file at a time. Is it possible to force it to wait for a few seconds before reading the Next file in the Folder. Or is there a solution to what I am trying to achieve? Any help would be appreciated.

    public static char readChar() {
    int ch;
    char r = '\0';
    boolean done = false;
    while (!done) {
    try {
    ch = System.in.read();
    r = (char) ch;
    if (r == '\r') {
    System.out.println("Not a character. Please try again!");
    System.in.skip(1);
    done = false;
    } else {
    System.in.skip(2);
    done = true;
    } catch (java.io.IOException e) {
    done = true;
    return r;
    Try this as an method and then use it..
    This code will read will be in response untill you hit the return key but will take only the first character....

  • Question on reading one character at a time.

    Hi. I am assigned a program where I have to read a series of bits (for example: 01010101). Using this I have to make a "graph out of it". The way I am supposed to make a graph is as follows:
    Each bit interval will be represented in the output as a field taht is two characters wide.
    The value of the signal is represented using either + (to represent +voltage) or - (to represent - voltage) and is always the second character in the output field.
    The first character in the output field is either:
    ' . ' = to indicate no change from the previous signal value or
    ' / ' = to indicate a negative to positive transition or else
    ' \ ' = to indicate a positive to negative transition
    Example for input: 01010101 and the output would be . + \ - . - / + \ - . - / + . + \ - / +
    The code that I got so far is that I read the input from the command line as a argument which I know is nothing but I would just like to know how to read the character one by one and make a graph which is totally boggling my mind because I have no idea how I can do it. Thank you for your help.
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    public class Encoder
         public static void main(String[] args)
              int b = Integer.parseInt(args[0].trim());
              System.out.println("You spit out --> "+b);

    Alright I sorta got what you were sayin'. The code that I have now is:
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    public class Encoder
         public static void main(String[] args)
              String toEncode = String.valueOf(args[0]);
              StringBuffer result = new StringBuffer();
              char lastChar = toEncode.charAt(0);
              char curChar = '0';
              char lastSign = '+';
              int length = toEncode.length();
              for (int i = 0; i < length; i++)
              curChar = toEncode.charAt(i);
              if (curChar != lastChar)
              if (curChar == '0')
              result.append("\\-");
              lastSign = '-';
              else
              result.append("/+");
              lastSign = '+';
              lastChar = curChar;
              else
              result.append(".");
              result.append(lastSign);
              System.out.println("You spit out --> "+result);
    But it doens't work according to what I want it to do. What I need it to do is the following: Lets say we have the input of 01010101, the result we will get is ". + \ - . - / + \ - . - / + . + \ - / +". The reason for this is because of the following: The graph starts on the v all the time. When there is a 0 bit there is no change and when there is a 1 bit there is an inversion of the voltage level so since we started with a 0 bit at v, when we hit 1 bit we would make a inversion to -v and when we hit 0 bit there would be no change. I don't know of what I said is clear to you or not. For this program, what it does for the input of 01010101, the output is
    " . + / + \ - / + \ - / + \ - / + ". Thank you very much.

  • Problem --serial port reading one character at a time

    Hi Friend,
    I reading the serial port  one character at a time ,  i specified it in the "serial bytes to read" option in serial port read examples.
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    but only the first character is reading again and again...and "reading string indicator" in the serial port example shows only the first character sent ..only for a single time.since i am reading continously ----aleast the first character should display as many times i running the program
    (i am running the vi by run continous option..........)..
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    regards
    rajasekar

    Hi jason...
    I can able to read the serial port by 1 byte or 2 byte or 4 byte as i can specify it in the serial port read bytes option..(in visa serial read)..
    I need to acquire 4 bytes of data and pass it to the Math-script node..and save these 4bytes of data in array (1 row and 4 column)..
    And split this array(just like array-indexing.vi) and processing it each each column separately....
    or suggest some method to achieve my task.....please.
    one more thing the math-script node is placed in a while loop.....in order to read sequence of bytes continously.......
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    rajasekar

  • How do I drag simultaneously mulitple images viewed in Preview to Finder. I know how to do one image at a time by dragging

    How do I drag multiple images simultaneously from Preview to Finder. I know how to do one at a time. However since I typically shoot at 12 frames per second, sports photography, I have a lot of images to move of one athlete while in motion.

    (A personal footnote):
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    I am only an amateur photographer, but I much prefer GraphicConverter which, for example, in batch mode would do much of what you ask.
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  • How to delete one record at a time

    hi all,
    Please tell me how i do delete only one record at a time.After deleting the record the jsp page should show only the remining items to be deleted.

    Where do u want to delete the record - database?
    If so use the rpimary Screen identifying each record and use that to delet that record

  • How to schedule one instance at a time consecutively

    Hi Everyone,
    We are at BOXIR3.1 SP5 installed in RHEL and business is looking for below mentioned scheduling option for specific webi reports which are complex and having high volume of data.
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    Karthik
    If i'm not wrong, this requirement is specific to one single report in your environment and not for all the Webi report.
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  • How to read 16 bits at a time from a file.

    Hi everyone:
    I have a homework problem that requires me to read from a file 16 bits at a time, which is a signed value. I have tried using the code below:
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         DataInputStream dis = new DataInputStream(fis);
         System.out.println("Reading "+fileName+"...");
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              System.out.println("Read "+fileName+" Successfully.");
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              System.exit(1);
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  • How to read Adapter Parameters at run time

    Hi All,
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    Regards,
    XIer
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    Bhavesh

  • How to send one single mail each time a table is updated with a batch of rows

    Hi!
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    Br Arne
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    END
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  • How to read from DAQ in different time intervals

    Hello,
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