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PORandom serialization exceptions using Socket
 

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  1. PORandom serialization exceptions using Socket
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    <p>I'm trying to send data back and forth between only two computers using a Socket. The data is in the form of serialized Packet objects.</p> <p>When testing the program on another computer on my local network, I'm getting random SerializationExceptions so that no data goes through. </p> <p>The program consistently sends different data, so when it makes another pass at sending it again, it will sometimes go through and sometimes hit the same SerializationException again. If I catch the exception and leave it running, all data eventually makes it through, but it takes several tries.</p> <p>The exception says: "The input stream is not a valid binary format. The starting contents (in bytes) are [byte data]"</p> <p>Not sure exactly where my problem lies. The larger amounts of data I send (~100kb max) <strong>always</strong> go through. The smaller ones (50-70 bytes) have trouble. Here's everything to do with my serialization and reading/writing data.</p> <p>Socket defined as such:</p> <pre><code>SocketMain = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); </code></pre> <p>Send &amp; Read methods. I'm aware this is probably a horrible way to do so and might end up being my issue. Suggestions?:</p> <pre><code> public void SendPacket(Packet P) { using (MemoryStream MS = new MemoryStream()) { BinaryFormatter BF = new BinaryFormatter(); BF.Serialize(MS, P); SocketMain.Send(MS.ToArray()); } } public void ReadPacket() { byte[] BufferArray = new byte[131072]; int BytesReceived = SocketMain.Receive(BufferArray); byte[] ActualData = new byte[BytesReceived]; Buffer.BlockCopy(BufferArray, 0, ActualData, 0, BytesReceived); using (MemoryStream MS = new MemoryStream(ActualData)) { BinaryFormatter BF = new BinaryFormatter(); HandlePacket((Packet)BF.Deserialize(MS)); } } </code></pre> <p>Example Packet object. This is one of my smaller ones. I <em>think</em> this might be the one that is causing the issue, but I don't know how I could tell.</p> <pre><code>[Serializable()] public class Packet4BlockVerify : Packet, ISerializable { public byte Index; public string MD5Hash; public Packet4BlockVerify(int Index, string MD5Hash): base(4) { this.Index = (byte)Index; this.MD5Hash = MD5Hash; } protected Packet4BlockVerify(SerializationInfo info, StreamingContext context) { this.ID = info.GetByte("ID"); this.Index = info.GetByte("Index"); this.MD5Hash = info.GetString("MD5Hash"); } public override void GetObjectData(SerializationInfo info, StreamingContext context) { info.AddValue("ID", this.ID); info.AddValue("Index", this.Index); info.AddValue("MD5Hash", this.MD5Hash); } } </code></pre> <p>Does anyone see anything wrong?</p>
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    1. USJohn Saunders
    1. USWildBamaBoy
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    1. COWhere is your socket.send/receive lines in your thread?I deal with send/receive data in local network by adding a header and footer to packet then in receiver part reading net till find header.
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      1. USsaeed
    2. COI'm only using a local computer for testing. The program is intended to be used over the internet. Packet sending and receiving has ended up mostly on the same thread, where when a packet is received it is immediately responded to by sending another appropriate packet.
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      1. USWildBamaBoy
    3. COI don't see any special note to your released code but, thought that your logic isn't tricky enough.There are some standard Net programming examples might help you.for your question a complete source code is required to reproduce it's bug.
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      1. USsaeed
 

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