使用 Protobuf-net 发送二进制数据

Question

使用Protobuf-net发送二进制数组有什么特殊要求吗？我有一条消息 class，其中包含一些二进制数据：

[ProtoContract]
public class BitmapPackage : BaseMessage
{
    [ProtoMember(1)]
    public byte[] BitmapData;
}

尝试反序列化消息时，我捕获到 Protobuf-net 抛出的异常：

16:52:59.902: (007): [Error] Inner Exception in StartReceiveLoop():Message: Attempted to read past the end of the stream.Stack Trace: at ProtoBuf.ProtoReader.Ensure(Int32 count, Boolean strict) in c:\Dev\protobuf-net\protobuf-net\ProtoReader.cs:line 257 at ProtoBuf.ProtoReader.AppendBytes(Byte[] value, ProtoReader reader) in c:\Dev\protobuf-net\protobuf-net\ProtoReader.cs:line 921 at proto_4(Object , ProtoReader ) at ProtoBuf.Serializers.CompiledSerializer.ProtoBuf.Serializers.IProtoSerializer.Read(Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Serializers\CompiledSerializer.cs:line 57 at ProtoBuf.Meta.RuntimeTypeModel.Deserialize(Int32 key, Object value, ProtoReader source) in c:\Dev\protobuf-net\protobuf-net\Meta\RuntimeTypeModel.cs:line 775 at ProtoBuf.Meta.TypeModel.DeserializeCore(ProtoReader reader, Type type, Object value, Boolean noAutoCreate) in c:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 700 at ProtoBuf.Meta.TypeModel.Deserialize(Stream source, Object value, Type type, SerializationContext context) in c:\Dev\protobuf-net\protobuf-net\Meta\TypeModel.cs:line 588 at ProtoBuf.Serializer.Deserialize[T](Stream source) in c:\Dev\protobuf-net\protobuf-net\Serializer.cs:line 77

只有当我发送一个特定的位图时才会发生这种情况。所以我的问题是，在使用 protobuf-net 反序列化之前，我是否应该以某种方式 "escape" 二进制数据？

更新：这是进行接收的代码：

private async Task StartReceiveLoop()
{
await Task.Yield();

while(!_readOpCancelToken.IsCancellationRequested)
{
    try
    {
        var buffer = new byte[4096];
        int bytesRx = await _pipe.ReadAsync(
            buffer, 0, buffer.Length, _readOpCancelToken);

        Logger.LogInfo("Pipe connection: Got " + bytesRx + " bytes");

        if (bytesRx == 0) break;
        if (_readOpCancelToken.IsCancellationRequested) break;

        await _receivedDataStream.WriteAsync(buffer, 0, bytesRx);

        if (_pipe.IsMessageComplete)
        {
            // Get out the routing data
            _receivedDataStream.Position = 0;
            byte[] intbuffer = new byte[4];

            _receivedDataStream.Read(intbuffer, 0, 4);
            int size = BitConverter.ToInt32(intbuffer, 0);

            _receivedDataStream.Read(intbuffer, 0, 4);
            int typeId = BitConverter.ToInt32(intbuffer, 0);

            _receivedDataStream.Read(intbuffer, 0, 4);
            int routeTag = BitConverter.ToInt32(intbuffer, 0);

            messageObj = messageObj = Serializer.NonGeneric.Deserialize(messageType, _receivedDataStream);

            // Process message on UI thread via tick queue
            TickSystem.OneTimeTickQueue.Enqueue(new Action(() =>
            {
                ProcessMessageExtApp.ProcessThisMessage(messageObj);
            }));

            // Reset the stream
            _receivedDataStream = new MemoryStream();
        }
    }
    catch (Exception e)
    {
        Logger.LogError(
            "Exception in StartReceiveLoop():" +
            "Message: " + e.Message +
            "Stack Trace: " + e.StackTrace);

        if (e.InnerException != null)
        {
            Logger.LogError(
            "Inner Exception in StartReceiveLoop():" +
            "Message: " + e.InnerException.Message +
            "Stack Trace: " + e.InnerException.StackTrace);
        }
    }
}

}

Answer 1

实际问题不是 Protobuf-net，而是 IsMessageComplete 过早发出信号这一事实。解决方法是使用字节数组写入管道服务器上的管道，而不是流复制并在完成每个数据包后刷新管道。

使用 Protobuf-net 发送二进制数据

Sending binary data with Protobuf-net

c#

.net

serialization

protocol-buffers

protobuf-net