Re: [protobuf] [Java][Python][TCP] Reading messages that where written with writeDelimited and viceversa

[Ilia Mirkin]

On Tue, Sep 29, 2015 at 9:31 AM, Mike White  wrote:
> aloha everyone,
>
> i stumbled across this post as i'm hitting this error as well. since i'm a
> newbie to python i had a question on how to implement this. when doing these
> steps,
>
> # Read a message from Java's writeDelimitedTo:
> import google.protobuf.internal.decoder as decoder

buffer = open(sys.argv[1], "rb").read()

>
> # Read length
> (size, position) = decoder._DecodeVarint(buffer, 0)
> # Read the message
> message_object.ParseFromString(buffer[position:position+size])

And then this should work, I think.

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Re: [protobuf] [Java][Python][TCP] Reading messages that where written with writeDelimited and viceversa

[Evan Jones]

On Mar 26, 2012, at 21:49 , Galileo Sanchez wrote:
 Thanks man... It worked great! I guess I should read the documentation a 
 little more xP.

Sadly these functions aren't actually documented. The Python API doesn't expose 
these routines for some reason I don't understand / remember. Glad it worked!

Evan

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Re: [protobuf] [Java][Python][TCP] Reading messages that where written with writeDelimited and viceversa

[Evan Jones]

On Mar 25, 2012, at 18:09 , Galileo Sanchez wrote:
 else 
 if (Should I write the size as a raw bit string?)
 thenHow do I do that?


You need to use something like the following. Not 100% sure it works but it 
should be close? Hope this helps,

Evan


# Output a message to be read with Java's parseDelimitedFrom
import google.protobuf.internal.encoder as encoder
out = message.SerializeToString()
out = encoder._VarintBytes(len(out)) + out


# Read a message from Java's writeDelimitedTo:
import google.protobuf.internal.decoder as decoder

# Read length
(size, position) = decoder._DecodeVarint(buffer, 0)
# Read the message
message_object.ParseFromString(buffer[position:position+size])


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http://evanjones.ca/

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Re: [protobuf] [Java][Python][TCP] Reading messages that where written with writeDelimited and viceversa

[Galileo Sanchez]

Thanks man... It worked great! I guess I should read the documentation a 
little more xP.



On Monday, March 26, 2012 9:49:17 PM UTC-3, Evan Jones wrote:

 On Mar 25, 2012, at 18:09 , Galileo Sanchez wrote:
  else 
  if (Should I write the size as a raw bit string?)
  thenHow do I do that?


 You need to use something like the following. Not 100% sure it works but 
 it should be close? Hope this helps,

 Evan


 # Output a message to be read with Java's parseDelimitedFrom
 import google.protobuf.internal.encoder as encoder
 out = message.SerializeToString()
 out = encoder._VarintBytes(len(out)) + out


 # Read a message from Java's writeDelimitedTo:
 import google.protobuf.internal.decoder as decoder

 # Read length
 (size, position) = decoder._DecodeVarint(buffer, 0)
 # Read the message
 message_object.ParseFromString(buffer[position:position+size])


 --
 http://evanjones.ca/



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