Append byte to a byte buffer in golang

Question

I have a message byte Buffer and I would like to append a byte at the end of the Buffer

I tried to append like this:

append(message.Buf, 0xff)
first argument to append must be slice; have *bytes.Buffer

append(0xff,message.Buf)
first argument to append must be slice; have untyped number

How can I make the 0xff as a slice to append?

The function append is for appending values to a slice and has absolutely nothing to do with bytes.Buffer which is not a slice. Just Write to your bytes.Buffer. And please read the docs ,especially golang.org/pkg/bytes/#Buffer.WriteByte — Volker
– Volker, Commented May 2, 2017 at 12:57

icza · Accepted Answer · 2018-04-12 05:35:10Z

5

You have a buffer which is of type bytes.Buffer (or more specifically a pointer to that type). It has a Buffer.WriteByte() method, just use that:

message.Buf.WriteByte(0xff)

The builtin append() function which you tried to call is to append values to slices. bytes.Buffer is not a slice, you can't use that with append() (it is implemented using an internal slice, but that is an implementation detail which you should not build on / utilize).

edited Apr 12, 2018 at 5:35

answered May 2, 2017 at 12:56

icza

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