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

[Can Baran]

Greetings Feng 
Is there a JAVA example for your answer and possible a usage case?
Thanks
Can


On Friday, August 5, 2016 at 11:23:30 AM UTC-7, Feng Xiao wrote:
>
>
>
> 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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>>
>
>

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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
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups 
>> "Protocol Buffers" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to protobuf+u...@googlegroups.com .
>> To post to this group, send email to prot...@googlegroups.com 
>> .
>> Visit this group at https://groups.google.com/group/protobuf.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>

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

['Feng Xiao' via Protocol Buffers]

On Thu, Aug 4, 2016 at 5:47 AM, Philipp Weissenbacher <
philipp.weissenbac...@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
>
> --
> You received this message because you are subscribed to the Google Groups
> "Protocol Buffers" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to protobuf+unsubscr...@googlegroups.com.
> To post to this group, send email to protobuf@googlegroups.com.
> Visit this group at https://groups.google.com/group/protobuf.
> For more options, visit https://groups.google.com/d/optout.
>

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