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[英]How can I create a file from a byte array and send it to the stream as a file without creating this file on the disk?
[英]How can i fill a byte array with a string without creating a new array?
我正在尝试打开多个websocket,我需要以某种方式在每个套接字上使用相同的缓冲区,或者在发送/接收新消息之前清除它们。 接收方法很好,因为我可以传递字节数组的参数,它将填充该参数而无需创建新的字节数组实例。
我该如何使用BitConverter.GetBytes
方法?我需要开始使用不安全的上下文并使用带有指针参数的重载GetBytes
吗?还有其他方法吗? 我需要它来填充将在构造函数中定义的outBytes
变量。
public class Client:IDisposable
{
//Fields
public char[] innerData { get; private set; }
private byte[] inBytes;
private byte[] outBytes;
private ArraySegment<byte> inSegment;
private ArraySegment<byte> outSegment;
private WebSocket webSocket;
public WebSocket Socket => this.webSocket;
public readonly string clientID;
//Auxiliary
private const int BufferSize = 1024;
public static Client CreateClient(WebSocket socket, string id)
{
Client client = new Client(socket, id);
return client;
}
public Client(WebSocket socket, string id)
{
this.inBytes = new byte[BufferSize];
this.inSegment = new ArraySegment<byte>(inBytes);
this.outBytes = new byte[BufferSize];
this.outSegment = new ArraySegment<byte>(outBytes);
this.webSocket = socket;
this.clientID = id;
this.innerData = new char[BufferSize];
}
public async Task<WebSocketReceiveResult> ReceiveResult()
{
if(this.webSocket.State!=WebSocketState.Open)
{
return null;
}
WebSocketReceiveResult result = await this.webSocket.ReceiveAsync(this.inSegment, CancellationToken.None);
Encoding.UTF8.GetChars(this.inSegment.Array, 0, BufferSize, this.innerData, 0);
return result;
}
public async Task SendMessage(string message)
{
if(this.webSocket.State==WebSocketState.Open)
{
this.outBytes = Encoding.UTF8.GetBytes(message, 0, message.Length); //How can i fill the already existing outBytes?
await this.webSocket.SendAsync(this.outSegment, WebSocketMessageType.Text, true, CancellationToken.None);
}
}
public void Dispose()
{
if(this.webSocket.State!=WebSocketState.Closed)
{
this.webSocket.Dispose();
this.webSocket = null;
}
}
}
我需要以某种方式利用现有outBytes
当我转换的消息,我将send.At此刻outBytes
的行为就像一个指针,并在每一个方法的SendMessage的每一次迭代GetBytes
将产生一个新的字节数组。
您显然对GetBytes的工作方式有误解,它不会每次都生成新的数组,此重载:
Encoding.GetBytes方法(字符串,Int32,Int32,Byte [],Int32)
将
将指定字符串中的一组字符编码为指定字节数组(来自MSDN)
所以你的线应该是
Encoding.UTF8.GetBytes(message, 0, message.Length, this.outBytes, 0);
该函数将把使用UTF8编码转换为字节的字符串填充到数组中,然后您可以使用返回值(它是整数)来检查已将多少字节写入到数组中。
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