[RESOLVED] how to read the data from .dat file?

[rita_ruan]

May i know how to read data from .dat file by using binary?Maybe my question is not clear......i paste out the code that i am using......

import java.io.*;

class BinaryFile
{
public static final short BIG_ENDIAN = 1;

public static final short LITTLE_ENDIAN = 2;

protected RandomAccessFile _file;

protected short _endian;

protected boolean _signed;

public BinaryFile (RandomAccessFile f)
{
_file = f;
_endian = LITTLE_ENDIAN;
_signed = false;
}

public void setEndian(short i) throws Exception
{
if ((i == BIG_ENDIAN) || (i == LITTLE_ENDIAN))
_endian = i;
else
throw (new Exception(
"Must be BinaryFile.LITTLE_ENDIAN or BinaryFile.BIG_ENDIAN"));
}

public int getEndian()
{
return _endian;
}

public void setSigned(boolean b)
{
_signed = b;
}

public boolean getSigned()
{
return _signed;
}

public String readFixedString(int length) throws java.io.IOException
{
String rtn = "";

for (int i = 0; i < length; i++)
rtn += (char) _file.readByte();
return rtn;
}

public void writeFixedString (String str, int length) throws
java.io.IOException
{
int i;

if (str.length() > length)
str = str.substring (0, length);

for (i = 0; i < str.length(); i++)
_file.write(str.charAt(i));

i = length - str.length();
while ((i--) > 0)
_file.write(0);
}

public String readLengthPrefixString() throws java.io.IOException
{
short len = readUnsignedByte();
return readFixedString(len);
}

public void writeLengthPrefixString(String str) throws
java.io.IOException
{
writeByte((byte) str.length());
for (int i = 0; i < str.length(); i++)
_file.write(str.charAt(i));
}

public String readFixedZeroString(int length) throws
java.io.IOException
{
String rtn = readFixedString(length);
int i = rtn.indexOf(0);
if ( i != -1)
rtn = rtn.substring(0, i );
return rtn;
}

public void writeFixedZeroString(String str, int length) throws
java.io.IOException
{
writeFixedString(str, length);
}

public String readZeroString() throws java.io.IOException
{
String rtn = "";
char ch;

do
{
ch = (char) _file.read();
if(ch != 0)
rtn += ch;
}while (ch != 0);
return rtn;
}

public void writeZeroString(String str) throws java.io.IOException
{
for (int i = 0; i < str.length(); i++)
_file.write(str.charAt(i));
writeByte((byte) 0 );
}

protected short readUnsignedByte () throws java.io.IOException
{
return (short) (_file.readByte() & 0xff);
}

public short readByte() throws java.io.IOException
{
if (_signed)
return (short) _file.readByte();
else
return (short) _file.readUnsignedByte();
}

public void writeByte(short b) throws java.io.IOException
{
_file.write(b & 0xff);
}

public int readWord() throws java.io.IOException
{
short a, b;
int result;

a = readUnsignedByte();
b = readUnsignedByte();

if (_endian == BIG_ENDIAN)
result = ((a << 8 ) | b);
else
result = (a | (b << 8));

if (_signed)
if (( result & 0x8000) == 0x8000)
result = - (0x10000 - result);
return result;
}

public void writeWord(int w) throws java.io.IOException
{
if (_endian == BIG_ENDIAN)
{
_file.write((w & 0xff00) >> 8);
_file.write(w & 0xff);
}
else
{
_file.write(w & 0xff);
_file.write((w & 0xff00) >> 8);
}
}

public long readDWord() throws java.io.IOException
{
short a, b, c, d;
long result;

a = readUnsignedByte();
b = readUnsignedByte();
c = readUnsignedByte();
d = readUnsignedByte();

if (_endian == BIG_ENDIAN)
result = ((a << 24) | (b << 16) | (c << 8) | d);
else
result = (a | (b << 8) | (c << 16) | (d << 24));

if (_signed)
if ((result & 0x80000000L) == 0x80000000L)
result = -((0x100000000L) - result);
return result;
}

public void writeDWord(long d) throws java.io.IOException
{
if (_endian == BIG_ENDIAN)
{
_file.write((int) (d & 0xff000000) >> 24);
_file.write((int) (d & 0xff0000) >> 16);
_file.write((int) (d & 0xff00) >> 8);
_file.write((int) (d & 0xff));
}
else
{
_file.write((int) (d & 0xff));
_file.write((int) (d & 0xff00) >> 8);
_file.write((int) (d & 0xff0000) >> 16);
_file.write((int) (d & 0xff000000) >> 24);
}
}

public void align (int a ) throws java.io.IOException
{
if ((_file.getFilePointer() % a) > 0)
{
long pos = _file.getFilePointer() / a;
_file.seek((pos + 1) * a);
}
}
}
this is the binary class file i am using.

import java.io.*;

class BinaryExample
{
public static void main(String args[]) throws FileNotFoundException
{
int i;
String stra,strb;
RandomAccessFile file;
BinaryFile bin;
final short endian = BinaryFile.BIG_ENDIAN;
final boolean signed = true;

try
{
file = new RandomAccessFile("011.dat","r");
bin = new BinaryFile(file);
bin.setEndian(endian);
bin.setSigned(signed);
stra = bin.readFixedString(25);
strb = bin.readFixedString(2);
file.close();

System.out.println("Wafer ID\t:" + stra);
System.out.println("Wafer No.\t:" + strb);
}
catch ( Exception e)
{
System.out.println("**Error:" + e.getMessage());
}
}
}
This is the main file(not complete yet).

however i could not read out the exact output....any one can help me?