Question

我正在尝试将图像从Javascript客户端发送到C＃服务器并将该图像保存在文件中。 Websocket已建立，我可以将消息从客户端发送到服务器。该消息是我从Javascript中的imagedata获取的字节数组。我的服务器获取字节数组，但是当我尝试将字节数组转换为图像时，我得到了System.ArgumentException：“ Invalid Parameter”。这是我来自Javascript客户端的代码：

var context = canvas.getContext('2d');
ar data2 = context.getImageData(0, 0, 800, 600).data;
var byteArray = new Array(data2);
connection.send(data);

这是我在C＃服务器上的代码：

        private static void OnAccept(IAsyncResult result)
    {
        byte[] buffer = new byte[1024];
        try
        {
            Socket client = null;
            string headerResponse = "";
            if (serverSocket != null && serverSocket.IsBound)
            {
                client = serverSocket.EndAccept(result);
                var i = client.Receive(buffer);
                headerResponse = (System.Text.Encoding.UTF8.GetString(buffer)).Substring(0, i);
                // write received data to the console
                Console.WriteLine(headerResponse);

            }
            if (client != null)
            {
                /* Handshaking and managing ClientSocket */

                var key = headerResponse.Replace("ey:", "`")
                          .Split('`')[1]                     
                          .Replace("\r", "").Split('\n')[0]  
                          .Trim();

                // key should now equal dGhlIHNhbXBsZSBub25jZQ==
                var test1 = AcceptKey(ref key);

                var newLine = "\r\n";

                var response = "HTTP/1.1 101 Switching Protocols" + newLine
                     + "Upgrade: websocket" + newLine
                     + "Connection: Upgrade" + newLine
                     + "Sec-WebSocket-Accept: " + test1 + newLine + newLine
                     //+ "Sec-WebSocket-Protocol: chat, superchat" + newLine
                     //+ "Sec-WebSocket-Version: 13" + newLine
                     ;


                client.Send(Encoding.UTF8.GetBytes(response));
                var i = client.Receive(buffer); // wait for client to send a message

                using (Image image = Image.FromStream(new MemoryStream(buffer)))
                {
                    image.Save("output.png", ImageFormat.Png);
                }


            }
        }
        catch (SocketException exception)
        {
            throw exception;
        }
        finally
        {
            if (serverSocket != null && serverSocket.IsBound)
            {
                serverSocket.BeginAccept(null, 0, OnAccept, null);
            }
        }
    }

当我尝试创建新的Memorystream（buffer）时发生我的异常。有人可以帮助您解决此问题吗？谢谢！

通过Websocket将图像从Javascript客户端发送到C＃服务器并将其保存在文件中

0 个答案: