Question

I need a byte array with 4 bytes which contains 2 shorts. I have now this:

MemoryStream str = new MemoryStream();
using (BinaryWriter writer = new BinaryWriter(stream)) {
     writer.Write((short) printscreen.Width);
     writer.Write((short) printscreen.Height);
}
byte[] bytes = str.ToArray();

In java I used bytebuffer. But what should I use for c#?

I send this bytes through a socket to a java server. Java code:

byte[] data = new byte[in.available()];
in.read(data);
ByteBuffer buffer = ByteBuffer.wrap(data);
System.out.println(buffer.getShort());

Answer 1

From the documentation on Java’s ByteBuffer Class:

Primitive values are translated to (or from) sequences of bytes according to the buffer’s current byte order, which may be retrieved and modified via the order methods. Specific byte orders are represented by instances of the ByteOrder class. The initial order of a byte buffer is always BIG_ENDIAN.

From the documentation on .NET’s BinaryWriter.Write(short) Method:

BinaryWriter stores this data type in little endian format.

Since you can’t change BinaryWriter, you need to change the byte order used by the ByteBuffer:

buffer.order(ByteOrder.LITTLE_ENDIAN);