protocol buffer message to and from an XPathDocument

[Lars Schouw]

I am trying to serialize and deserialize a protocol buffer message to and from an XPathDocument but it fails with an exception: ProtoBuf.ProtoException: Mismatched group tags detected in messageHow do I make this work?

I am using protobuf-net and my source code for reproducing it looks like this:

TestMsg.proto

    option optimize_for = SPEED;

//*************************
message Test {
    repeated A a = 1;
}

message A {
    required string str = 1;
}

Progam.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
using System.Xml.XPath;
using ProtoBuf;
using TestMsg;

namespace protocolbufferserialize
{
    class Program
    {
        static void Main(string[] args)
        {
            Test t = new Test();
            XPathDocument xmldoc = Serialize(t);
            Test t1 = Serialize(xmldoc);
        }

        public static XPathDocument Serialize(Test wro)
        {
            XPathDocument xmlDoc = null;
            Serializer.PrepareSerializer<Test>();

            XmlSerializer x = new XmlSerializer(wro.GetType());
            using (MemoryStream memoryStream = new MemoryStream())
            {
                using (TextWriter w = new StreamWriter(memoryStream))
                {
                    x.Serialize(w, wro);
                    memoryStream.Position = 0;
                    xmlDoc = new XPathDocument(memoryStream);
                }
            }
            return xmlDoc;
        }

        public static Test Serialize(XPathDocument xmlDoc)
        {
            Test t = null;
            Serializer.PrepareSerializer<Test>();

            XmlSerializer x = new XmlSerializer(xmlDoc.GetType());
            using (MemoryStream memoryStream = new MemoryStream())
            {
                using (TextWriter w = new StreamWriter(memoryStream))
                {
                    x.Serialize(w, xmlDoc);
                    memoryStream.Position = 0;
                    t = Serializer.Deserialize<Test>(memoryStream);
                }
            }
            return t;
        }
    }
}

[Marc Gravell]

Hi - I'm a bit confused... protobuf is a binary format with no relationship *whatsoever* to XML. It makes no sense to write XML and try to read it as protobuf. What is it you want to do here?

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[lasse]

I want to use XPath on my messages so need to move to and from XML.

[Siju Varghese]

https://github.com/sijuv/protobuf-codec/ supports protobuf<->xml conversions.

On Thu, Jul 21, 2011 at 4:48 AM, lasse <la...@schouw.me> wrote:

I want to use XPath on my messages so need to move to and from XML.

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To view this discussion on the web visit https://groups.google.com/d/msg/protobuf/-/mKbJ7GITXV0J.

[Lars Schouw]

I am trying to port protobuf-codecto c# now working against protobuf-net.

In Google official Java implementaion I have com.google.protobuf.Message when is the equivalent in protobuf-net?

Lars