Byte Conversion problem - 0,0,0,127

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Hi,
I'm trying to convert a byte array across to a readable format (the 2nd column is time but does not have to be cast as time, it could be a cast as a string), what I'm expecting is a series of zero's like in the table below, which would represent midnight.
Date.........Time...........Open........etc
10/07/2010 23:00:000 1.39330 1.39480 1.39090 1.39330 67817
10/08/2010 0:00:000 1.39330 1.39340 1.39020 1.39120 34728
10/08/2010 1:00:000 1.39130 1.39210 1.38490 1.38780 40004

The byte array for the other numbers in the same column convert over fine.
For example:

byte[] bytes = { 0, 156, 96, 72 };
float Time = System.BitConverter.ToSingle(single, 0);

Works out as 230000.0 (top line 2nd column) which I can make sense of and parse out as a time if I need to. The others all work fine too. But midnight

byte[] bytes = { 0, 0, 0, 127 };
float Time = System.BitConverter.ToSingle(single, 0)

returns 1.70141183E+38 which is not what I expect.:confused:

Any help would be greatly appreciated.

Regards
Flatstrap

Posted 8-Oct-10 5:30am

Flatstrap

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Alan N · Answer 1 · 2010-10-08T05:52:00

Hi,

I think your expectation is incorrect. Test your assumption, e.g.

C#

class Program {
  static void Main(string[] args) {
    ShowBytes(0.0F);
    ShowBytes(1.70141183E+38F);
  }

  private static void ShowBytes(Single s) {
    Byte[] b = BitConverter.GetBytes(s);
    Console.WriteLine("{0} {{ {1}, {2}, {3}, {4} }}", s, b[0], b[1], b[2], b[3]);
  }

Output is

<pre>0 { 0, 0, 0, 0 }
1.701412E+38 { 0, 0, 0, 127 }

Alan.

Toli Cuturicu · Answer 2 · 2010-10-08T08:27:00

Solution 2

Don't try to convert it to float. Float is lossy, and has rounding errors. Convert it to string, int, uint, long or ulong. You may also keep the bytes, but output them as hex.

Posted 8-Oct-10 8:27am

Toli Cuturicu

Flatstrap · Answer 3 · 2010-10-14T03:22:00

Thanks for the replies guys...
Alan I like your frank response :) And Toli thanks for the advice.
For anyone searching this I found a simple solution...

private float GetFloat()
{
byte[] bytes = { 0, 0, 0, 127 }
if (bytes[3] == 0) return 0.0f;
.
.
.
* code here*.
}

This effectively returns 0 for any minute number.

Cheers
Flatstrap

Byte Conversion problem - 0,0,0,127

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