Java - Printing buffer data together

zolf
zolf used Ask the Experts™
on
Hello there,

I have this piece of code and want to print out the data in the buffer,cam somebody please guide me how can i achieve it.

cheers
Zolf

 Buffer buf = Buffer.buffer();
            buf.appendByte((byte) 0x02).appendString("CLR").appendByte((byte) 0x03)
                    .appendByte((byte) 0x1b).appendString("K1").appendByte((byte) 0x0d)
                    .appendByte((byte) 0x1b).appendString("C").appendByte((byte) 0x0d)
                    .appendByte((byte) 0x1b).appendString("K2").appendByte((byte) 0x0d)
                    .appendByte((byte) 0x1b).appendString("C").appendByte((byte) 0x0d)
                    .appendByte((byte) 0x1b).appendString("K3").appendByte((byte) 0x0d)
                    .appendByte((byte) 0x1b).appendString("C").appendByte((byte) 0x0d)
                    .appendByte((byte) 0x1b).appendString("K4").appendByte((byte) 0x0d)
                    .appendByte((byte) 0x1b).appendString("C").appendByte((byte) 0x0d);
                    socket.write(buf);

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dpearson

Commented:
I don't think Buffer here is the standard Java buffer class - i.e. java.nio.Buffer

I suspect this is an internal class - in which case you'd need to look inside that class to see how it is representing the data and how to print it out.

If it contains a ByteBuffer then that has a getChar() method which you can use to read and print the current contents of the buffer.

Doug
zolf

Author

Commented:
thanks for your comments.

Yes I am using a 3rd party buffer class and the link to it is http://vertx.io/docs/apidocs/io/vertx/core/buffer/Buffer.html
Commented:
Given that I would suggest working with one of these methods:

String      getString(int start, int end)
Returns a copy of a sub-sequence the Buffer as a String starting at position start and ending at position end - 1 interpreted as a String in UTF-8 encoding

Or if that doesn't work try this one:

byte[]      getBytes(int start, int end)
Returns a copy of a sub-sequence the Buffer as a byte[] starting at position start and ending at position end - 1

In both cases, end would be:
int      length()
Returns the length of the buffer, measured in bytes.

That should give you access to the data in the buffer.

If length returns 0, then you should try call this before the socket.write(buf) which may empty the buffer, depending how it is written.

Hope that helps,

Doug
zolf

Author

Commented:
cheers

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