Reading a Binary / Structured / Formated File Using JAVA

Use Scanner (http://java.sun.com/j2se/1.5.0/docs/api/java/util/Scanner.html)
 
To read float, call nextFloat()

Your data file (although > 26Mb) is completely empty of anything other than 0

Please Use This File If you need to.
 http://www.postecsolutions.com.au/EE/HisD6.zip

Ajay-Singh>> That wont Help. Have tried Everything I could. Thats why I'm asking a example.
Udana

Hi Udana,
  Few clarifications-
1. Is there a delimiter between each records ?
2. What does Units(380) signify ? Is it an array of 380 elements ?
3.Is it guaranteed that all the elements in your record will always be populated ?
Can it ever happen that any of Units or Prom can be null ?

Jaax.
1 Nope There are no delimiter. file is binary represnts of short and float arrays.
2 Units(380) means in VB array of 381 elements.
3 All elements not need to populated for each new or updatrd record. it can be null  or 0 bytes. However each record will take exactly 5334bytes in this case.

Sound Like This is Very Hard Question...
Few Tips for all the partcipating Experts..

1 My previous Question with similar issue>> https://www.experts-exchange.com/questions/22402467/How-to-read-sturctured-formated-binary-file-from-JAVA.html

2 Refer http://www.particle.kth.se/~lindsey/JavaCourse/Book/Part1/Java/Chapter09/fileBinaryIO.html
Regarding Binary I/O. Difference between this case and my case is this case each record has an Int and Float(two variables). In my case each record has 381 floats X 3 and 381 shorts(1524 variables).

3 I think We might need to use BinaryRead or File Object read.

Why 381 and not 380?

Does that file have 3895 records by any chance

CHANGES.
I have two different set of files they either above mentioned file structure or
        Type PHist
                Units(55) As Single
                Sell(55) As Single
                Cost(55) As Single
                Prom(55) As Integer
        End Type
in this case record size is 784. These file could be this structure (784bytes)or previously mentioned structure. In this case following file is with this structure (784 bytes). These file structure change depend on our clients. I'm Sorry for the tangle. Anyway reading logic would be same.
 http://www.postecsolutions.com.au/EE/HisD6.zip
In this case file size would be 20,725,824 bytes and there for number of records would be  20,725,824 / 784. which is 26436.

CEHJ>>
I'm realy sorry for the inconvinience. I guess I have explain it above.
so its 26436 records.
in java
float[55] zzz; would be array zzz with 55 elements. (0,1,2,3,.....53,54)

in VB
Dim zzz(55) As Single means array zzz with high bound is 55. (0,1,2,3,4,......54,55) which is 56 elements

No problem. Here you go:

package demo;

import java.io.DataInput;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintStream;

public class Histx {
      private static int UNITS_SIZE, SELL_SIZE, COST_SIZE, PROM_SIZE;
      static {
            UNITS_SIZE = SELL_SIZE = COST_SIZE = PROM_SIZE = 56;
      }

      /**
       * @param args
       */
      public static void main(String[] args) {
            File f = new File("c:/install-files/HisD6.dat");
            DataInputStream in = null;
            int recCount = 0;
            try {
                  in = new DataInputStream(new FileInputStream(f));
                  while (Histx.printRecordAsCsv(in, System.out)) {
                        recCount++;
                  }
            } catch (FileNotFoundException e) {
                  e.printStackTrace();
            }
            finally {
                  if (in != null) {
                        try {
                              in.close();
                        } catch (IOException e) {
                              // Ignore
                        }
                  }
            }
            
      }

      public static boolean printRecordAsCsv(DataInput in, PrintStream out) {
            try {
                  for (int i = 0; i < Histx.UNITS_SIZE; i++) {
                        out.print(in.readFloat());
                        out.print(',');
                  }
                  for (int i = 0; i < Histx.SELL_SIZE; i++) {
                        out.print(in.readFloat());
                        out.print(',');
                  }
                  for (int i = 0; i < Histx.COST_SIZE; i++) {
                        out.print(in.readFloat());
                        out.print(',');
                  }
                  for (int i = 0; i < Histx.PROM_SIZE - 1; i++) {
                        out.print(in.readShort());
                        out.print(',');
                  }
                  out.print(in.readShort());
                  out.println();
                  return true;
            } catch (EOFException e) {
                  // Ignore
                  return false;
            } catch (IOException e) {
                  e.printStackTrace();
                  return false;
            }
      }
      
}

CEHJ>>
I tested it. WOW its work what a releif. Thanks mate. Why didnt I think like that. Well having said that. I was thinking rather than reading element at a time cant we read whole record at a time? Like can we deal single record as a object or so?
___________________________
In VB browsing through VB would be.
Open "c:/install-files/HisD6.dat" For Random Shared As #19 Len = 784
// open the file choped by 784 bytes(record length)    
Get #19, Recno, Hist
// geting the desired record by number(in this case Recno would be 1 to 26436)
// in here Hist refered as 'Type', earlier mentioned.
For i = 1 to 55
something = Hist.Units(i)
// so on
Next i
Close #19
// close the opened file
___________________

I guess you get the idea. I'm not comparing an eventdriven method with object oriented method, but in this case we can read the specific  record and alter if I need to. Out of curiousity I have a question for you.

1 Say we need to read record number 1234 and change 20th element of sell() array in 1234th record. How Can we do that?

-------------------------------------------------
In VB
Open "c:/install-files/HisD6.dat" For Random Shared As #19 Len = 784
 Hist.Sell(20) = whateveryouwant //(a single, of course)
Put#19, 1234, Hist
Close #19
//whole thing will take less than a milisecond or so..:)
--------------------------------------------------

CEHJ>>
Im going to accept your answer.. no doubt about that. but  is it easy to read the record by record?
Anyway will ask the question again and will invite you to participate.
Udana.
Thank you very much for your Help.

:-)

It's easy yes but not light on resources. Got to go to bed now though ;-)

Please Have a Look. https://www.experts-exchange.com/questions/22429751/Reading-a-Binary-Structured-Formated-File-Using-JAVA.html Udana