指定的参数超出了在c＃中从网络获取数据的有效值范围(Specified argument was out of the range of valid value to get data from ne

指定的参数超出了在c＃中从网络获取数据的有效值范围(Specified argument was out of the range of valid value to get data from network in c#)

我正在尝试向传感器发送命令并使用以下代码从中获取数据：

const int PORT_NO = 3000; const string SERVER_IP = "192.168.2.44"; //---listen at the specified IP and port no.--- IPAddress localAdd = IPAddress.Any; TcpListener listener = new TcpListener(localAdd, PORT_NO); Console.WriteLine("Listening..."); listener.Start(); //---incoming client connected--- TcpClient client = listener.AcceptTcpClient(); NetworkStream nwStream = client.GetStream(); //---write back the text to the client--- byte[] buffersend = new byte[client.ReceiveBufferSize]; buffersend = GetBytes("00010002000B0300010004C380"); int bytesSend = nwStream.Read(buffersend, 0, client.ReceiveBufferSize); // Console.WriteLine("Sending back : " + dataReceived); nwStream.Write(buffersend, 0, bytesSend); //---get the incoming data through a network stream--- byte[] buffer = new byte[client.ReceiveBufferSize]; //---read incoming stream--- int bytesRead = nwStream.Read(buffer, 0, client.ReceiveBufferSize); //---convert the data received into a string--- string dataReceived = Encoding.ASCII.GetString(buffer, 0, bytesRead); Console.WriteLine("Received : " + dataReceived); client.Close(); listener.Stop(); Console.ReadLine(); }

在这一行中int bytesSend = nwStream.Read(buffersend, 0, client.ReceiveBufferSize); 我收到了这个错误：

Specified argument was out of the range of valid value

buffersend为52， client.ReceiveBufferSize为8192

static byte[] GetBytes(string str) { byte[] bytes = new byte[str.Length * sizeof(char)]; System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length); return bytes; }

我是c＃socket编程的新手

I am trying to send a command to a sensor and get the data from it using this code :

const int PORT_NO = 3000; const string SERVER_IP = "192.168.2.44"; //---listen at the specified IP and port no.--- IPAddress localAdd = IPAddress.Any; TcpListener listener = new TcpListener(localAdd, PORT_NO); Console.WriteLine("Listening..."); listener.Start(); //---incoming client connected--- TcpClient client = listener.AcceptTcpClient(); NetworkStream nwStream = client.GetStream(); //---write back the text to the client--- byte[] buffersend = new byte[client.ReceiveBufferSize]; buffersend = GetBytes("00010002000B0300010004C380"); int bytesSend = nwStream.Read(buffersend, 0, client.ReceiveBufferSize); // Console.WriteLine("Sending back : " + dataReceived); nwStream.Write(buffersend, 0, bytesSend); //---get the incoming data through a network stream--- byte[] buffer = new byte[client.ReceiveBufferSize]; //---read incoming stream--- int bytesRead = nwStream.Read(buffer, 0, client.ReceiveBufferSize); //---convert the data received into a string--- string dataReceived = Encoding.ASCII.GetString(buffer, 0, bytesRead); Console.WriteLine("Received : " + dataReceived); client.Close(); listener.Stop(); Console.ReadLine(); }

in this line int bytesSend = nwStream.Read(buffersend, 0, client.ReceiveBufferSize); i got this error :

Specified argument was out of the range of valid value

the buffersend is 52 and the client.ReceiveBufferSize is 8192

static byte[] GetBytes(string str) { byte[] bytes = new byte[str.Length * sizeof(char)]; System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length); return bytes; }

I am so new in c# socket programming

最满意答案

而不是这个

byte[] buffersend = new byte[client.ReceiveBufferSize]; buffersend = GetBytes("00010002000B0300010004C380"); int bytesSend = nwStream.Read(buffersend, 0, client.ReceiveBufferSize); nwStream.Write(buffersend, 0, bytesSend);

我想你只想要这个。

byte[] buffersend = GetBytes("00010002000B0300010004C380"); nwStream.Write(buffersend, 0, buffersend.Length);

没有必要新建一个数组只是为了用GetBytes的结果替换它。 另外我不认为你想读入buffersend ，你只想写它。 然后你的后一个代码将读入buffer 。

您获得异常的原因是， buffersend NetworkStream.Read的文档， buffersend的长度小于client.ReceiveBufferSize

Instead of this

byte[] buffersend = new byte[client.ReceiveBufferSize]; buffersend = GetBytes("00010002000B0300010004C380"); int bytesSend = nwStream.Read(buffersend, 0, client.ReceiveBufferSize); nwStream.Write(buffersend, 0, bytesSend);

I think you just want this.

byte[] buffersend = GetBytes("00010002000B0300010004C380"); nwStream.Write(buffersend, 0, buffersend.Length);

There is no need to new up an array just to replace it with the results of GetBytes. Also I do not think you want to read into buffersend, you just want to write it. Your latter code will then read into buffer.

The reason you are getting the exception is that buffersend has a length that is less than client.ReceiveBufferSize per the documentation for NetworkStream.Read