Oh, I see. No, CodedOutputStream doesn't support seek functionality, so I
guess you'd have to go with b). Just make sure that you're using
WriteLittleEndian64 and not WriteVarint64.
On Sat, Nov 14, 2009 at 12:05 PM, Fishtank saptarshi.g...@gmail.com wrote:
That's because I don't know the size
I have the following class:
package PB_SimpleMessage;
message SimpleMessage
{
required RootNode header = 1;
required RootNode payload = 2;
}
message RootNode
{
repeated string parameters = 1;
}
In my code i am do the following:
The output is correct. You have not initialized the header field. You
need to call mutable_header() once to initialize it.
On Mon, Nov 16, 2009 at 1:45 AM, edan edan.sha...@gmail.com wrote:
I have the following class:
package PB_SimpleMessage;
message SimpleMessage
{
You can decode the protocol buffer with just wire type + tag number, but you
won't know the original types without a proto definition. Everything would
be treated as an unknown field. You could access these by iterating through
the UnknownFieldSet, but again, you can't recover the original types.
Hi
I'm new to ProtocolBuffer. Until now all is going ok with Protocol
Buffers for my needs.
But, now I'm struggling for a while with a Message-New issue without
a clue.
I'm trying to create concrete messages, which are known at runtime
using DynamicMessageFactory (C++). Following is the
On Mon, Nov 16, 2009 at 11:35 AM, JC-MAD-SP public.cebal...@gmail.comwrote:
ConcreteMessage* concreteMessage = reinterpret_castConcreteMessage*
(mesage-New());
This line is invalid. Here, *message is a DynamicMessage, and New() also
returns a DynamicMessage, not a ConcreteMessage.
BTW, you could catch this problem more easily if you defined a down_cast
function like:
template typename To, typename From
To down_cast(From from) {
#ifdef NDEBUG
return static_castTo(from);
#else
To result = dynamic_castTo(from);
assert(result != NULL);
return result;
#endif
}
This
(I think my previous reply didn't arrive)
Thanks Kenton, this worked fine for me.
Probably, with DynamicMessageFactory I was trying to solve in a single
attempt, dynamic generation of both classes known in compile-time and
unknown. I forgot then to check back again with MessageFactory. I
guess,
Hi,
Thanks for the clarification. I did try one dirty method of finding the
original types, because of my .proto-less situation. I relied on exception
statements thrown out when I iterated through the protobuffers by trying to
extract a known wiretype with a wrong-type getter. I know it sucks,
It sounds like you actually have the message class available, not just a
serialized instance of the message. In that case, you can derive the
original type by reading the generated code. If you only have a compiled
copy of the class, you can derive the type from its descriptor -- use
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