[server] Add ErrorMessage class.

PixelHub-Server/PixelHub/PixelHub.csproj

@@ -45,6 +45,7 @@
     <Compile Include="PixelMessage.cs" />
     <Compile Include="PixelMessages\HandshakeRequestMessage.cs" />
     <Compile Include="PixelMessages\ResetMessage.cs" />
+    <Compile Include="PixelMessages\ErrorMessage.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

PixelHub-Server/PixelHub/PixelMessages/ErrorMessage.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Text;
+
+namespace PixelHub.Server.PixelMessages
+{
+	public class ErrorMessage : PixelMessage
+	{
+		public uint ErrorCode = 0;
+
+		public string Message = string.Empty;
+
+		public override byte[] Payload {
+			get {
+				byte[] rawErrorCode = BitConverter.GetBytes(ErrorCode);
+				byte[] rawErrorMessage = Encoding.UTF8.GetBytes(Message);
+
+				byte[] result = new byte[rawErrorCode.Length + rawErrorMessage.Length];
+				Buffer.BlockCopy(rawErrorCode, 0, result, 0, rawErrorCode.Length);
+				Buffer.BlockCopy(rawErrorMessage, 0, result, rawErrorCode.Length, rawErrorMessage.Length);
+
+				return result;
+			}
+			protected set {
+				byte[] rawErrorCode = new byte[sizeof(uint)];
+				byte[] rawErrorMessage = new byte[value.Length - sizeof(uint)];
+				ErrorCode = BitConverter.ToUInt32(rawErrorCode);
+				Message = Encoding.UTF8.
+			}
+		}
+
+		public ErrorMessage()
+		{
+		}
+	}
+}
+