[英]Receiving Packet using Socket
我是Socket編程的新手,我只想問些什么。
我試圖在客戶端和服務器之間創建Simple Receiver和Sender數據包(嗯,我使用的是同一台計算機),但是我遇到了問題...
發送功能正常運行,但是我不知道如何接收與發送的數據包大小完全相同的數據包。
例如,我從客戶端向服務器發送5個字節,我只想讓服務器也只接收5個字節,不多也不少,我想用Socket來做到這一點,我也已經包括了短數據包的大小(int16 2字節)格式。 這是我的發送數據包代碼:
public static void Send(Socket socket, byte[] buffer, int timeout)
{
int startTickCount = Environment.TickCount;
int sent = 0;
int offset = 0;
int size = buffer.Length;
// Add size of packet in the begin of data packet with short (int16) format
List<byte> tmpdata = new List<byte>();
tmpdata.AddRange(BitConverter.GetBytes((short)(buffer.Length + 2)));
tmpdata.AddRange(buffer);
buffer = tmpdata.ToArray();
do
{
if (Environment.TickCount > startTickCount + timeout)
throw new Exception("Sending packet was timeout.");
try
{
sent += socket.Send(buffer, offset + sent, size - sent, SocketFlags.None);
}
catch (SocketException ex)
{
if (ex.SocketErrorCode == SocketError.WouldBlock ||
ex.SocketErrorCode == SocketError.IOPending ||
ex.SocketErrorCode == SocketError.NoBufferSpaceAvailable)
{
Thread.Sleep(30);
}
else
throw ex;
}
} while (sent < size);
}
有人能幫我嗎?
感謝Damien的修復並且找到了解決方案,但由於循環每個字節,因此恐怕這會占用內存,下面是代碼:
public static byte[] Receive(Socket socket)
{
System.Net.Sockets.NetworkStream ns = new NetworkStream(socket);
int b = (byte)1;
List<byte> databuf = new List<byte>();
while ((b = ns.ReadByte()) != -1)
databuf.Add((byte)b);
return databuf.ToArray();
}
沒有NetworkStream,有沒有更好的解決方案,或者還有更好的性能? 謝謝
您尚未顯示接收代碼,但可以輕松修復一個錯誤:
// Add size of packet in the begin of data packet with short (int16) format
List<byte> tmpdata = new List<byte>();
tmpdata.AddRange(BitConverter.GetBytes((short)(buffer.Length + 2)));
tmpdata.AddRange(buffer);
buffer = tmpdata.ToArray();
int size = buffer.Length; //Moved from higher up, now that buffer is a different size
在接收端,您應該有類似的代碼-循環直到您讀取2個字節,使用它來創建一個short
,即要接收的總大小,減去2(老實說,我只是避免在上面的代碼中加2並以忽略大小編碼的實際字節的大小發送該大小),然后再次循環直到您閱讀了整個消息。
沒有NetworkStream,有沒有更好的解決方案,或者還有更好的性能?
NetworkStream充當Socket的高級包裝,因此您可以直接使用它做同樣的事情:
var targetStream = new MemoryStream();
var buffer = new byte[receiveBufferSize];
int bytesReceived = 0;
while ((bytesReceived = socket.Receive(buffer)) > 0)
{
targetStream.Write(buffer, 0, bytesReceived);
}
當需要執行多個並發操作時, Socket
中還有SendAsync
和ReceiveAsync
方法可以很好地工作。 但是它們更加復雜:
var receive = new SocketAsyncEventArgs();
var receiveBuffer = new byte[receiveBufferSize];
receive.SetBuffer(receiveBuffer, 0, receiveBuffer.Length);
receive.Completed += HandleReceived;
if (!socket.ReceiveAsync(receive))
{
HandleReceived(this, receive);
}
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