output streams

[J.V.]

I'm trying to get the following to work but nothing is being written to
the output stream.
any ideas?

private void testEncode() throws Exception {
OutputStream out = new ByteArrayOutputStream();
CodedOutputStream cos = CodedOutputStream.newInstance(out);

Person.person.Builder person = Person.person.newBuilder();
person.setFirstName("First");
person.setLastName("Last");
person.build().writeTo(cos);
}

When I try to decode cos it throws an exception
Exception in thread "main"
com.google.protobuf.InvalidProtocolBufferException: Protocol message
contained an invalid tag (zero).

[Kenton Varda]

You have to flush the CodedOutputStream.

You should just do this instead:

  byte[] data = person.build().toByteArray();

[J.V.]

Thanks, for some reason I'm' getting the same error. If you have an
example of encoding to a stream and then decoding, it would be greatly
appreciated.
I will get it fully working and update the tutorial or post it somewhere
if desired.

thanks

jrv

[Kenton Varda]

Write to a stream:

  message.writeTo(stream);

Parse from a stream:

  message = MyType.parseFrom(stream);

If you need to read/write multiple messages on the same stream (or the stream does not end immediately after the first message), use writeDelimitedTo() and parseDelimitedFrom().