TCP server client issue
First i am n00b in socket programming. So i decided to write simple data over lan tcp server My server code that handles incomming data is
private void HandleClientComm(object client)
{
TcpClient tcpClient = (TcpClient)client;
NetworkStream clientStream = tcpClient.GetStream();
clientStream.ReadTimeout = 10;
int size = 4096 * 1000;
byte[] message = new byte[size];
byte[] All = new byte[0];
int bytesRead;
string error = "";
lock (this)
{
while (true)
{
All = new byte[0];
while (true)
{
bytesRead = 0;
try
{
bytesRead = clientStream.Read(message, 0, size);
All = AddBArrays(All, message, bytesRead);
}
catch
{
break;
}
if (bytesRead == 0)
{
break;
}
}
if (All.Length > 0)
{
开发者_高级运维 Message m = (Message)Tools.ByteArrayToObject(All);
OnRecived(new RecivedArgs("localhost", (Message)Tools.ByteArrayToObject(All)));
}
}
tcpClient.Close();
}
}
byte[] AddBArrays(byte[] ar1, byte[] ar2, int read)
{
byte[] concat = new byte[ar1.Length + read];
if (ar1.Length != 0)
System.Buffer.BlockCopy(ar1, 0, concat, 0, ar1.Length);
System.Buffer.BlockCopy(ar2, 0, concat, ar1.Length, read);
return concat;
}
it works but have some issues. It fales receiving files bigger then 100 mbs or smthng and also if i send data very often interval < 800 then data is lost. how should i improve my code? The large file issue is not so important the primary issue is the data loss in fast data sending. tnx for help
Ok i now updated the code by the suggestions
private void HandleClientComm(object client)
{
TcpClient tcpClient = (TcpClient)client;
NetworkStream clientStream = tcpClient.GetStream();
clientStream.ReadTimeout = 10;
int size = 4096 * 1000;
List<byte> Test = new List<byte>();
byte[] message = new byte[size];
byte[] All = new byte[0];
int bytesRead;
while (true)
{
//All = new byte[0];
while (true)
{
bytesRead = 0;
try
{
bytesRead = clientStream.Read(message, 0, size);
for (int i = 0; i < bytesRead; i++)
{
Test.Add(message[i]);
}
}
catch
{
break;
}
if (bytesRead == 0)
{
break;
}
}
if (Test.Count > 0)
{
Message m = (Message)Tools.ByteArrayToObject(Test.ToArray());
OnRecived(new RecivedArgs("localhost", m));
Test = new List<byte>();
}
}
tcpClient.Close();
}
but the issues still there
Edit--> large file issue fixed it was just a 'System.OutOfMemoryException' but it didn't throw a error.
- The All byte array you should change to a
List<byte>
. You are creating instances like crazy right now. The GC is probably working a lot more than it needs to. This might be slowing it down so much that it can't keep up.
Not really related to sockets:
- Make size a
const
- NEVER lock
this
. Create a private field that you can lock. In fact, I don't even think you need a lock here. - remove the error string.
OK i solved the problem. I simple send to much data to fast so data loss was unavoidable.
My optimized code is
private void HandleClientComm(object client)
{
TcpClient tcpClient = (TcpClient)client;
NetworkStream clientStream = tcpClient.GetStream();
int size = 1;
byte[] message = new byte[1];
int bytesRead;
while (true)
{
bytesRead = 0;
if (clientStream.DataAvailable)
bytesRead = clientStream.Read(message, 0, 1);
if (bytesRead > 0)
{
OnRecived(new RecivedArgs("tick", null));
}
Thread.Sleep(1);
}
}
i have tested intervals as low as 1 ms and no data loss :) thanks for your help
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