Get int from bytes in Java, encoded first in C#

Question

I am having a problem converting an int from a byte array first encoded in C#. I first convert it into big-endian because Java works in big-edian rather than small. The following code encodes the into into bytes

    Console.WriteLine("A new data client has connected!");
    byte[] welcomeMessage = ASCIIEncoding.ASCII.GetBytes("Welcome young chap! Please let me know about anything you need!");

    welcomeMessage = Byte.add(BitConverter.GetBytes(System.Net.IPAddress.HostToNetworkOrder(20)), welcomeMessage);

Byte.add appends the two arrays together. This works because I have used it between C# to C#. The welcome message is first loaded with a header byte to let the client know what the information is. I get strange values on the java side when I try to decode it. I am not sure if I am decoding or encoding improperly. The java side is such. This is running on an android device:

   if (ByteBuffer.wrap(buffer).getInt() == 20)
   {
          latestMessage = new String(buffer); 
   }
   latestMessage = String.valueOf(ByteBuffer.wrap(buffer).getInt(0)); //Lets me see what value this is. Cant attach debugger for some reason ATM.

Greg Kopff · Accepted Answer · 2012-04-15 05:39:44Z

3

A ByteBuffer can be configured to decode multi-byte values as either big or little endian using the order() method.

For example:

final ByteBuffer bb = ByteBuffer.wrap(buffer);
bb.order(ByteOrder.LITTLE_ENDIAN);

final int i = bb.getInt();
...

answered Apr 15, 2012 at 5:39

Greg Kopff

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Community · Accepted Answer · 2017-05-23 12:12:08Z

0

Maybe the BitConverter class can be of assistance. Have a look here.

edited May 23, 2017 at 12:12

CommunityBot

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answered Apr 15, 2012 at 5:34

Vic

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1 Comment

Serguei Fedorov Over a year ago

Hey I just realized I forgot to include the line which converts the header int into bytes. I have changed it accordingly.

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