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POReceiving serialized custom message types over a network, how to cast?
 

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  1. POReceiving serialized custom message types over a network, how to cast?
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    <p>I'm writing a networked application.</p> <p>Assume a class called <strong>Packet</strong>. This class has some public properties.</p> <pre><code>public class Packet { public Module DestinationModule { get; set; } public EncryptionCompressionFlag EncryptedOrCompressed { get; set; } public PacketPriority Priority { get; set; } public Origin Origin { get; set; } // You'll see why I need this later // This StackOverflow question is asking how I can do without this property public Type UltimateType { get; set; } } </code></pre> <p>Now assume a class called <strong>LoginPacket</strong>. This class extends <strong>Packet</strong>, and includes even more properties.</p> <pre><code>public class LoginPacket : Packet { public string Username { get; set; } public string Password { get; set; } } </code></pre> <p>But <strong>LoginPacket</strong> is not the only type of custom packet. There are many more custom packets.</p> <p>My client application is constantly serializing custom packets and sending them over the wire. When they are deserialized on the other side, however, I can only deserialize them as a Packet, not as a specific <strong>LoginPacket</strong>. </p> <p>Question: How can I know the 'ultimate' or 'original' specific type of the Packet? Per the example, the specific type would have been <strong>LoginPacket</strong>. I don't know the specific type because I receive it over the wire simply as a <strong>Packet</strong> and without a "type" property (like <em>UltimateType</em>, which sounds lame), I don't know how to discover the specific original type.</p> <p><em>Response: "How do you serialize the packet?"</em></p> <p>I use <a href="http://www.codeproject.com/KB/XML/yaxlib.aspx" rel="nofollow">YAXSerializer</a>. I tested a specific serialization and deserialization of <strong>LoginPacket</strong>, and it was successful. I was able to deserialize the string (<em>YAX serializes to a string, not byte array, difference doesn't really matter..</em>) into a <strong>Packet</strong> <em>and</em> a <strong>LoginPacket</strong>. </p> <pre><code> public static string SerializePacket(Packet packet) { YAXSerializer serializer = new YAXSerializer(packet.UltimateType); return serializer.Serialize(packet); } </code></pre>
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    1. USJason
    1. USJason
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      1. VTUpMod
    1. COHow are you serializing the packets?
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      1. USCameron
    2. COyou don't need the tags (C#/.net etc) in the title of the question. That's what the tags are for :) Otherwise, good question.
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      1. USAlastair Pitts
 

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