인프런 커뮤니티 질문&답변

************** 예외 텍스트 **************
System.Net.Sockets.SocketException (10061): 대상 컴퓨터에서 연결을 거부했으므로 연결하지 못했습니다.
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
at System.Threading.Tasks.ValueTask.ValueTaskSourceAsTask.<>c.<.cctor>b__4_0(Object state)

--- End of stack trace from previous location ---
at Client.Singleton.ConnectAsync() in P:\Chat\Client\Singleton.cs:line 36
at Client.LoginForm.btn_login_Click(Object sender, EventArgs e) in P:\Chat\Client\LoginForm.cs:line 20
at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)

 16:45초 로그인 할 때 이렇게 뜨네요 ㅠㅠ

해당 라인 가보면
LoginForm.cs
await Singleton.Instance.ConnectAsync();

Singleton.cs

await Socket.ConnectAsync(endPoint);

입니다. 아이피와 포트도 제대로 입력해주었습니다.

강사님이 올려주신 파일 통째로 받아서 해봤는데도 동일한 오류가 발생합니다.

어떻게 해결해야하나요?


코드 첨부합니다.

LoginForm.cs

using Core;

namespace Client;

public partial class LoginForm : Form

{

public LoginForm()

{

InitializeComponent();

}

private async Task btn_login_Click(object sender, EventArgs e)

{

if (string.IsNullOrEmpty(tbx_id.Text) || string.IsNullOrEmpty(tbx_nickname.Text))

{

MessageBox.Show("입력하세요");

return;

}

await Singleton.Instance.ConnectAsync();

LoginRequestPacket packet = new LoginRequestPacket(tbx_id.Text, tbx_nickname.Text);

await Singleton.Instance.Socket.SendAsync(packet.Serialize(), System.Net.Sockets.SocketFlags.None);

Singleton.Instance.Id = tbx_id.Text;

Singleton.Instance.Nickname = tbx_nickname.Text;

RoomList roomList = new RoomList();

roomList.ShowDialog();

}

}

Singleton.cs

using System.Net;

using System.Net.Sockets;

namespace Client;

/// <summary>

/// 언제 어디서나 접근할 수 있는 객체.

/// 이 객체는 반드시 1개만 존재해야 한다.

/// </summary>

internal class Singleton

{

public string Id { get; set; } = null!;

public string Nickname { get; set; } = null!;

public Socket Socket { get; } = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

private static Singleton? instance;

public static Singleton Instance

{

get

{

if (instance == null)

instance = new Singleton();

return instance;

}

}

private Singleton()

{

}

public async Task ConnectAsync()

{

IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("192.168.219.106"), 20001);

await Socket.ConnectAsync(endPoint);

ThreadPool.QueueUserWorkItem(ReceiveAsync, Socket);

}

private async void ReceiveAsync(object? sender)

{

Socket socket = (Socket)sender!;

byte[] headerBuffer = new byte[2];

while (true)

{

#region 헤더버퍼 가져옮

int n1 = await socket.ReceiveAsync(headerBuffer, SocketFlags.None);

if (n1 < 1)

{

Console.WriteLine("client disconnect");

socket.Dispose();

return;

}

else if (n1 == 1)

{

await socket.ReceiveAsync(new ArraySegment<byte>(headerBuffer, 1, 1), SocketFlags.None);

}

#endregion

#region 데이터버퍼 가져옮

short dataSize = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(headerBuffer));

byte[] dataBuffer = new byte[dataSize];

int totalRecv = 0;

while (totalRecv < dataSize)

{

int n2 = await socket.ReceiveAsync(new ArraySegment<byte>(dataBuffer, totalRecv, dataSize - totalRecv), SocketFlags.None);

totalRecv += n2;

}

#endregion

}

}

}