Hi,
I am also looking for this feature. I saw the SVN update to
CHANGES.txt<http://code.google.com/p/protobuf/source/browse/trunk/CHANGES.txt?spec=svn426&r=425>.
Can you please confirm if this has been committed to the public svn ?
Thanks
On Monday, September 10, 2012 10:51:16 PM UTC-4, Jason Hsueh wrote:
>
> This feature was just implemented internally, and I believe it should make
> the next release (2.5.0). It's in progress, but not quite ready to hit svn
> yet.
>
>
> On Thu, Aug 30, 2012 at 6:53 AM, Jan Koriťák <[email protected] <javascript:>
> > wrote:
>
>> Hello,
>>
>> I am using Python to write a tool to control our backends which
>> communicate using protocol buffers.
>>
>> We would like our tool to be independent on current version of backends
>> and therefore independent on .proto files that were used to build the
>> particular version of the backend.
>>
>> Therefore the tool receives serialized FileDescriptorSet over network,
>> which should allow to create messages from the same descriptors, that are
>> used at the backend side.
>>
>> This is possible to implement in C++ (and we actually use it in another
>> component) using DynamicMessage. (Create DescriptorPool, load all the
>> FileDescriptors
>> to the pool using BuildFile(), and then retrieve Descriptor from the
>> pool. Then it is possible to create message using DynamicMessageFactory)
>>
>> However, after thorough research on the web and of the source code of
>> protocol buffers python bindings, I couldn't figure out how to do this
>> (version 2.4.0).
>>
>> I was able to deserialize FileDescriptorSet, iterate over
>> FileDescriptorProtos
>> and get DescriptorProto object. However I didn't find a way to construct
>> Descriptor
>> objects, which are needed to create classes for message types(with
>> GeneratedProtocolMessageType
>> as a metaclass).
>>
>> I tried another way, when I found some access to C++ library API in
>> google.protobuf.internal (which is probably not a good idea to use). I
>> tried to indirectly use the C++ descriptor pool by
>> cpp_message.BuildFile(), but there is no way to get the Descriptorobject
>> back from the pool (it would be C++ object anyway). However there is
>> a method cpp_message.NewCMessage, which can construct a message using
>> descriptors from the pool. I was able to construct messages that way, but I
>> was unable to set any fields. Only method that appeared usable was
>> SetScalar, which requires C++ decriptor, which I was unable to get. Not
>> to mention all of the Python magic is gone when dealing directly with the
>> C++ API.
>>
>> Is there any way to create messages of arbitrary type, which is
>> distributed over network, in Python ? I see those possibilities in both
>> Java and C++, is Python library lacking such funcionality ?
>>
>> Thank you very much, hope I was clear enough.
>> Best regards,¨
>>
>> Jan Koritak
>>
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>
>
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