🚀 go-pugleaf

I posted my problem on a google group (comp.lang.java.programmer) and 
got a solution that works:

 > Example: Somewhere in the Hex below store: 40.0 Single (Delphi = 4
 > bytes)

 > Hex From file: 00 00 00 00 20 42 00 00 00

 >  - I assume to read 00 00 20 42 but can read from any pos ...

 > I have tried any type of read and conversion but can't get this one
 > right (or any floats) from the file.

   public float readFP() throws java.io.IOException {
       byte a, b, c, d;

       a = _file.readByte();
       b = _file.readByte();
       c = _file.readByte();
       d = _file.readByte();

       byte[] ba = { d, c, b, a };
       DataInputStream dis = new DataInputStream(new      	
                                           ByteArrayInputStream(ba));
       float x = dis.readFloat();

       return x;
   }

Magnus wrote:
> Hi,
> 
> I have a binary file that was written by a Delphi application and I got 
> the description of all the records and structures in the file.
> 
> I did a search to learn how to read a binary file and found 
> http://www.heatonresearch.com/articles/22/page2.html. I use the 
> BinaryFile class to read the file and I have managed to get all strings 
> out of the file.
> 
> My problem is that I can't get a single number right so I made a program 
> that seek (below) through the whole file but without luck.
> The seek program sets the "Endian" and "signed" in all combinations for 
> all positions through out the binary file.  I do find some values but 
> not at the right position and not the expected values.
> I have also tried:
>  - a "Long" version
>  - used readWord (2 bytes)
>  - used java's readFloat()
>  but no luck.
> 
> Is there anyone who can help me get my bits straight?
> 
> TIA
> 
> ---
> static void seekFloatValue(File ff, float value) throws
>                     FileNotFoundException {
>   RandomAccessFile file = new RandomAccessFile(ff, "r");
>   BinaryFile bin = new BinaryFile(file);
> 
>   try {
>     long len = file.length();
>     System.out.println("seekValueFloat value="+value+"  len="+len+" 
> FileName:"+ff);
>     float tmp=0;
>     for (int i = 0; i<=len-4; i++) {
>        for (int j=0;j<4;j++) {
>           switch(j) {
>       case 0:bin.setEndian(bin.BIG_ENDIAN);bin.setSigned(true);
>              break;
>       case 1:bin.setEndian(bin.LITTLE_ENDIAN);bin.setSigned(true);
>              break;
>       case 2:bin.setEndian(bin.BIG_ENDIAN);bin.setSigned(false);
>              break;
>       default:bin.setEndian(bin.LITTLE_ENDIAN);bin.setSigned(false);
>      }
>      bin.setPos(i);
>      tmp = (float) bin.readDWord();
>      if (tmp == value)
>          System.out.println("pos" + i + "   tmp=" + tmp + "   ENDIAN=" +
>                             bin.getEndian() + "   signed=" +
>                             bin.getSigned());
>     }
>    }
> 
>  } catch (Exception e) {
>       System.out.println("**Error: " + e.getMessage());
>    }
> 
> }