[protobuf] Conversation of proto2 file to proto3

[ערן אוצפ]

Hello,  I'm new to protocol buffers,Ive been given a proto2 file the generate 
classes on my side (The receiving side). The problem is that my end is written 
in C#.  How should I approach this issue ?

I'm thinking i can write my own proto file in a proto3 syntax. But this can be 
a breading ground for incompatiblaty. 
Is there any proven tool which can do this for me ? 


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[protobuf] Convert .proto file from "proto2" to "proto3"

[ערן אוצפ]

Hello , 

Iv'e received a .proto file from a third party vendor which sends me 
notifications.

The problem is that my end is written is C# and iv'e the file is written to 
target "proto2". 


As i understand it 
  1) to generate C# classes from a .proto file the file has to be written 
in a "proto3" syntax. 
  2) "proto2" and "proto3" are compatible when used as two ends of a wire 
protocol, i.e. 
  
  Sender uses classes generated from a "proto2" file . 
  Receiver (me in this case) uses classes generated from a 
"proto3" file. 

1) are these assumption correct ? 
2) If so is there any tool i can use to convert the "proto2" file iv'e been 
given to a "proto3" file so i can generate C# classes on my end ?  

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Re: [protobuf] Creating ProtoBuf Messages without the generated proxy classes

[Philipp Weissenbacher]

Thanks for your repsonse Feng!

 We've ended up doing exactly that in Scala, actually.

Regards,
Philipp

Op vrijdag 5 augustus 2016 20:23:30 UTC+2 schreef Feng Xiao:
>
>
>
> On Thu, Aug 4, 2016 at 5:47 AM, Philipp Weissenbacher <
> philipp.we...@gmail.com > wrote:
>
>> Hi all,
>>
>> We are currently implementing a testing library. One goal is to allow the 
>> client to test sending and receiving ProtoBuf messages.
>> For this, we need a generic way to create them, without requiring the 
>> client to supply the generated proxy classes.
>> This means MyType.getDefaultInstance() (as suggested here 
>> )
>>  
>> would not work.
>>
>> So, is there a generic way to create ProtoBuf messages (e.g. from .proto 
>> files) at runtime?
>>
> If you are using C++, you can use the Importer class:
>
> https://github.com/google/protobuf/blob/master/src/google/protobuf/compiler/importer.h#L148
>
> to parse .proto files to FileDescriptor and then use DynamicMessage to 
> create message instances:
>
> https://github.com/google/protobuf/blob/master/src/google/protobuf/dynamic_message.h#L118
>
> After that you can parse/serialize and manipulate the message instances 
> using the reflection API:
>
> https://developers.google.com/protocol-buffers/docs/reference/cpp/google.protobuf.message#Reflection
>
>  
>
>>
>> BTW, we're using Scala/Java and protobuf2.
>>
>> Sincerely,
>> Philipp
>>
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>>
>
>

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