Protobuf-net

[Anonymous]

I’m on Android Xamarin. Which version and dll type I need to add to xamarin references ?
I donwloaded protobuf-net from google repo, which I have to include ?
Thanks
Max

[Anonymous]

SOlved this one I got another problem.
I need to serialize pictures, videos, audio files.
I see the protobuf example. It use Systems.Drawing library which is ’empty’ in xamarin android.
How do I have to do in xamarin ? Which are libraries I need to import to serializa (like in your tutorial) images, audio and video ?
Thanks in advance.
Max

[Anonymous]

Heya Eudosia, I couldn’t give you any more specific advice other than what is already presented here.

[Anonymous]

I used to start your sample and I have modified the ImageWrapper class to suite the bitmap class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Graphics;
using NetworkCommsDotNet;
using System.IO;
using DPSBase;
using ProtoBuf;

namespace Discovery_Service
{
	[ProtoContract]
	public class ImageWrapper
	{
		/// <summary>
		/// Private store of the image data as a byte[]
		/// This will be populated automatically when the object is serialised
		/// </summary>
		[ProtoMember(1)]
		private byte[] _imageData;

		/// <summary>
		/// The image name
		/// </summary>
		[ProtoMember(2)]
		public string ImageName { get; set; }

		/// <summary>
		/// The public accessor for the image. This will be populated
		/// automatically when the object is deserialised.
		/// </summary>
		public Bitmap Image { get; set; }

		/// <summary>
		/// Private parameterless constructor required for deserialisation
		/// </summary>
		private ImageWrapper() { }

		/// <summary>
		/// Create a new ImageWrapper
		/// </summary>
		/// <param name="imageName"></param>
		/// <param name="image"></param>
		public ImageWrapper(string imageName, Bitmap _image)
		{
			this.ImageName = imageName;
			this.Image = _image;
		}

		/// <summary>
		/// Before serialising this object convert the image into binary data
		/// </summary>
		[ProtoBeforeSerialization]
		private void Serialize()
		{
			if (Image != null)
			{
				//We need to decide how to convert our image to its raw binary form here

				    byte[] bitmapData;
					using (var stream = new MemoryStream())
					{
						Image.Compress (Bitmap.CompressFormat.Png, 0, stream);

						bitmapData = stream.ToArray();
					}

			}
		}

		/// <summary>
		/// When deserialising the object convert the binary data back into an image object
		/// </summary>
		[ProtoAfterDeserialization]
		private void Deserialize()
		{
		    
			//If we added custom data processes we have the perform the reverse operations here before
			//trying to recreate the image object
			//e.g. DPSManager.GetDataProcessor<LZMACompressor>()
			Image = BitmapFactory.DecodeByteArray(_imageData , 0, _imageData.Length);

		    _imageData = null;
		}
	}
}

But I got several errors from the class. Do you can see any evidence ?
Thanks
Max

[Anonymous]

What are the errors?

[Anonymous]

I receive this from the application output and object is not sent:

[mono] Stacktrace:
[mono]
[mono] at (wrapper delegate-invoke) <Module>.invoke_bool__this___intptr_intptr_intptr_JValue[] (intptr,intptr,intptr,Android.Runtime.JValue[]) <0xffffffff>
[mono] at Android.Runtime.JNIEnv.CallBooleanMethod (intptr,intptr,Android.Runtime.JValue[]) <0x00053>
[mono] at Android.Graphics.Bitmap.Compress (Android.Graphics.Bitmap/CompressFormat,int,System.IO.Stream) <0x001eb>
[mono] at Discovery_Service.ImageWrapper.Serialize () <0x0006b>
[mono] at (wrapper runtime-invoke) object.runtime_invoke_void__this__ (object,intptr,intptr,intptr) <0xffffffff>
[mono] at System.Reflection.MonoMethod.Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x00183>
[mono] at System.Reflection.MethodBase.Invoke (object,object[]) <0x00047>
[mono] at ProtoBuf.Serializers.TypeSerializer.InvokeCallback (System.Reflection.MethodInfo,object,ProtoBuf.SerializationContext) <0x00157>
[mono] at ProtoBuf.Serializers.TypeSerializer.Callback (object,ProtoBuf.Meta.TypeModel/CallbackType,ProtoBuf.SerializationContext) <0x0004b>
[mono] at ProtoBuf.Serializers.TypeSerializer.Write (object,ProtoBuf.ProtoWriter) <0x0003b>
[mono] at ProtoBuf.Meta.RuntimeTypeModel.Serialize (int,object,ProtoBuf.ProtoWriter) <0x00087>
[mono] at ProtoBuf.Meta.TypeModel.SerializeCore (ProtoBuf.ProtoWriter,object) <0x00067>
[mono] at ProtoBuf.Meta.TypeModel.Serialize (System.IO.Stream,object,ProtoBuf.SerializationContext) <0x00073>
[mono] at ProtoBuf.Meta.TypeModel.Serialize (System.IO.Stream,object) <0x00027>
[mono] at ProtoBuf.Serializer/NonGeneric.Serialize (System.IO.Stream,object) <0x00033>
[mono] at DPSBase.ProtobufSerializer.SerialiseDataObjectInt (System.IO.Stream,object,System.Collections.Generic.Dictionary`2<string, string>) <0x00027>
[mono] at DPSBase.DataSerializer.SerialiseGeneralObject<T> (T,System.Collections.Generic.List1<DPSBase.DataProcessor>,System.Collections.Generic.Dictionary2<string, string>) <0x0006f>
[mono] at DPSBase.DataSerializer.SerialiseDataObject<T> (T,System.Collections.Generic.List1<DPSBase.DataProcessor>,System.Collections.Generic.Dictionary2<string, string>) <0x000ff>
[mono] at NetworkCommsDotNet.Packet.Constructor (string,string,object,NetworkCommsDotNet.SendReceiveOptions) <0x0015b>
[mono] at NetworkCommsDotNet.Packet..ctor (string,object,NetworkCommsDotNet.SendReceiveOptions) <0x00037>
[mono] at NetworkCommsDotNet.Connection.SendObject (string,object,NetworkCommsDotNet.SendReceiveOptions) <0x0004b>
[mono] at NetworkCommsDotNet.Connection.SendObject (string,object) <0x00027>
[mono] at NetworkCommsDotNet.NetworkComms.SendObject (string,string,int,object) <0x00057>
[mono] at Discovery_Service.MainActivity.OnActivityResult (int,Android.App.Result,Android.Content.Intent) <0x001b3>
[mono] at Android.App.Activity.n_OnActivityResult_IILandroid_content_Intent_ (intptr,intptr,int,int,intptr) <0x00077>
[mono] at (wrapper dynamic-method) object.289cae26-1434-4d67-9bd5-8ab6ccb6ee0a (intptr,intptr,int,int,intptr) <0x0005b>
[mono] at (wrapper native-to-managed) object.289cae26-1434-4d67-9bd5-8ab6ccb6ee0a (intptr,intptr,int,int,intptr) <0xffffffff>
Exception has been thrown by the target of an invocation.
[ActivityNative] send ACTIVITY_IDLE_TRANSACTION

[Author]

Posts