CODEWITHSUNDEEP
javascriptprotocol-buffers
Ankur Bhatia
Ankur Bhatia

Reputation: 1138

Decoding a Google protocol buffer message in javascript using ProtoBuf.js

I am trying to send a message over MQTT making use of the google protocol buffer in javascript (ProtoBuf.js)

I was able to encode the message using the following code:

var ProtoBuf = dcodeIO.ProtoBuf;
var builder = ProtoBuf.loadProtoFile("./complex.proto"),
Game = builder.build("Game"),
Car = Game.Cars.Car;
var car = new Car({
"model" : "Rusty",
"vendor" : {
            "name" : "Iron Inc.",
           "address" : {
                "country" : "USa"
             }
          },
    "speed" : "FAST"
 });
 var buffer = car.encode();
console.log(buffer);
var messagegpb = buffer.toBuffer();
console.log(messagegpb ); //This prints "ArrayBuffer { byteLength: 29 }"

Now for decoding when I tried the following, it just doesn't do anything. I see no logs in the browser as well.

var dec = builder.build("Game"); //nothing after this line gets executed
var msg = dec.decode(messagegpb);
console.log(msg);

This is the link of the .proto file I am using. https://github.com/dcodeIO/ProtoBuf.js/blob/master/tests/complex.proto

Could someone point me where I am going wrong?

Thanks a ton

Upvotes: 4

Views: 9199

Answers (1)

Kenton Varda
Kenton Varda

Reputation: 45326

Presumably these lines:

var dec = builder.build("Game");
var msg = dec.decode(messagegpb);

Need to be:

var Game = builder.build("Game");
var msg = Game.Cars.Car.decode(messagegpb);

That is, you need to specify what type you're decoding.

Probably your attempt to call dec.decode was throwing an exception saying the decode method didn't exist. You should have been able to see these exceptions on the error console, or caught them with try/catch.

Upvotes: 2

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