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Java - Printing buffer data together

Posted on 2016-07-15
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Last Modified: 2016-07-17
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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Question by:zolf
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Expert Comment

by:dpearson
ID: 41714725
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
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Author Comment

by:zolf
ID: 41715035
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
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Accepted Solution

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dpearson earned 2000 total points
ID: 41715037
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
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Author Closing Comment

by:zolf
ID: 41715065
cheers
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