receiving string from c# to Java mistakes

Question

I want to send String from C# to Jave I do it in C# in 2 side like this

Sender: C#

NetworkStream ns1 = _client2.GetStream();
byte[] b = { (byte)2 };//this is the command that sent from client to Server  
ns1.Write(b, 0, 1);
string data = "222222222";
byte[] b2 = _AC.GetBytes(data);
ns1.Write(b2, 0, b2.Length);

Reciever C#

 Byte[] b = new byte[10];
 ns.Read(b, 0, b.Length);
 string Data = _AE.GetString(b);

 while (ns.DataAvailable)
   {
     b = new byte[10];
     ns.Read(b, 0, b.Length);
     Data += _AE.GetString(b);
    }

I do some coding with no luck in Java .... like this..

byte b = is.readByte();
byte[] buff= new byte[8];
is.read(buff,0,10);

I receive inside buff[50,50,50,50,50,50,50,50,50]; .....then how to change it to string in java ..... Any help would be great ....thanks

50 is the ASCII code for "2" - you'll just have to convert your numeric value to its ASCII representation. — Frank Schmitt
– Frank Schmitt, Commented Mar 24, 2012 at 20:14

thomas · Accepted Answer · 2012-03-24 20:42:25Z

2

You should specify the encoding of your string! If the c#-program runs on another machine with another operating system than the java-application you might get problems. The java-doc of the String(byte[])-Constructor says:

Constructs a new String by decoding the specified array of bytes using the platform's default charset. ...

Let's say you specify utf-8 string encoding. You should also make sure that c# is also sending an utf-8-string:

byte[] utf8Bytes = System.Text.Encoding.UTF8.GetBytes(myString);

on java-side you should read the bytes as an utf-8-string like this:

String str = new String(buff, "UTF-8");

answered Mar 24, 2012 at 20:42

thomas

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Comments

GavinCattell · Accepted Answer · 2012-03-24 20:27:13Z

1

String has a contsructor for bytes. Just use:

String myNewString = String(buff);

There are several constructors for Strings from bytes, if you don't have any offset, or length concerns then just use the constructor above. If you start to have issues with character sets you can use something like:

String myNewString = null;
try {
    myNewString = String(buff , "UTF-8") 
} catch (java.io.UnsupportedEncodingException uee) {
    //Using an unknown charset will get you here.
    uee.printStackTrace();
}

edited Mar 24, 2012 at 20:27

answered Mar 24, 2012 at 20:18

GavinCattell

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2 Comments

paulsm4 Over a year ago

@Anas ZO KO - you're absolutely on the right track. To send a string over a socket between C# and Java, you should use byte buffers on both sides, to send and receive. Then all you need to do is, as GavinCattell said, convert byte[] buffer into a string with the right "String()" constructor. Voila - it's as easy as that :)

paulsm4 Over a year ago

PS: You'd do pretty much exacty the same thing if you wanted to send the string from Java to C#.

Radu Murzea · Accepted Answer · 2012-03-24 20:18:10Z

0

50 is the numeric ASCII value of the character "2". Just take each element of buff and apply a cast of char to it: (char) buff[0], (char) buff[1] etc.

answered Mar 24, 2012 at 20:18

Radu Murzea

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2 Comments

paulsm4 Over a year ago

But the LAST thing you want to do is read input byte by byte, if you can avoid it. Read the smallest subset of data you can all at once, then convert, and then process. Doing as much I/O at a time is a huge performance win. ALSO: as Thomas suggested, you might also need to specify the encoding type. For example, both C# and Java default to UTF-16. But Java UTF-16 is big-endian, and C# UTF-16 is little endian (completely different!): stackoverflow.com/questions/4793387/…

Radu Murzea Over a year ago

I actually think that thomas's answer is the best. Weird to say but... I was kind of shocked you accepted my answer...

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