chat function

Chat/Client/ChatRoomForm.cs

@@ -25,17 +25,18 @@ namespace Client
 			lbxUser.Items.Add(Singleton.Instance.Nickname);
 			Singleton.Instance.UserEnterResponsed += UserEnterResponsed;
 			Singleton.Instance.UserLeaveResponsed += UserLeaveResponsed;
+			Singleton.Instance.ChatResponsed += ChatResponsed;
 		}
 
-		private void btmSend_Click(object sender, EventArgs e)
+		private async void btmSend_Click(object sender, EventArgs e)
 		{
 			if (string.IsNullOrEmpty(tbxMsg.Text))
 				return;
 
-			lbxMsg.Items.Add(tbxMsg.Text);
-			tbxMsg.Text = null;
+			ChatPacket packet = new ChatPacket(Singleton.Instance.Nickname, tbxMsg.Text);
+			await Singleton.Instance.SendAsync(packet.Serialize(), SocketFlags.None);
 
-			ScrollMsgToEnd();
+			tbxMsg.Text = null;
 		}
 
 		private void ScrollMsgToEnd()
@@ -83,10 +84,24 @@ namespace Client
 			});
 		}
 
+		private void ChatResponsed(object? sender, EventArgs e)
+		{
+			if (sender == null)
+				return;
+
+			ChatPacket packet = (ChatPacket)sender;
+			InvokeMethod(() =>
+			{
+				lbxMsg.Items.Add($"{packet.NickName}: {packet.Message}");
+				ScrollMsgToEnd();
+			});
+		}
+
 		private async void ChatRoomForm_FormClosing(object sender, FormClosingEventArgs e)
 		{
 			Singleton.Instance.UserEnterResponsed -= UserEnterResponsed;
 			Singleton.Instance.UserLeaveResponsed -= UserLeaveResponsed;
+			Singleton.Instance.ChatResponsed -= ChatResponsed;
 			
 			UserLeavePacket packet = new UserLeavePacket(Singleton.Instance.Nickname);
 			await Singleton.Instance.SendAsync(packet.Serialize(), SocketFlags.None);

Chat/Client/LoginForm.cs

@@ -60,6 +60,7 @@ namespace Client
 			else
 			{
 				Singleton.Instance.Socket.Shutdown(SocketShutdown.Send);
+				MessageBox.Show("Fail to login");
 			}
 		}
 	}

Chat/Client/Singleton.cs

@@ -23,6 +23,7 @@ namespace Client
 		public event EventHandler? EnterRoomResponsed;
 		public event EventHandler? UserEnterResponsed;
 		public event EventHandler? UserLeaveResponsed;
+		public event EventHandler? ChatResponsed;
 
 		public async Task ConnectAsync(string ip, int port)
 		{
@@ -100,6 +101,11 @@ namespace Client
 					UserLeavePacket packet = new UserLeavePacket(dataBuffer);
 					UserLeaveResponsed?.Invoke(packet, EventArgs.Empty);
 				}
+				else if (packetType == PacketType.Chat)
+				{
+					ChatPacket packet = new ChatPacket(dataBuffer);
+					ChatResponsed?.Invoke(packet, EventArgs.Empty);
+				}
 			}
 		}
 	}

Chat/Core/ChatPacket.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Core
+{
+	public class ChatPacket : IPacket
+	{
+		public string Message { get; private set; }
+		public string NickName { get; private set; }
+
+		public ChatPacket(string nickname, string message)
+		{
+			NickName = nickname;
+			Message = message;
+		}
+
+		public ChatPacket(byte[] buffer)
+		{
+			int cursor = 2;
+
+			short messageSize = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, cursor));
+			cursor += sizeof(short);
+
+			Message = Encoding.UTF8.GetString(buffer, cursor, messageSize);
+			cursor += messageSize;
+
+			short nicknameSize = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, cursor));
+			cursor += sizeof(short);
+
+			NickName = Encoding.UTF8.GetString(buffer, cursor, nicknameSize);
+		}
+
+		public byte[] Serialize()
+		{
+			// 2bytes header
+			// data: 2bytes packetType + 2bytes id size + id + 2bytes nickname size + nickname
+
+			byte[] packetType = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)PacketType.Chat));
+			byte[] message = Encoding.UTF8.GetBytes(Message);
+			byte[] messageSize = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)message.Length));
+			byte[] nickname = Encoding.UTF8.GetBytes(NickName);
+			byte[] nicknameSize = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)nickname.Length));
+
+			short dataSize = (short)(packetType.Length + message.Length + messageSize.Length + nickname.Length + nicknameSize.Length);
+			byte[] header = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(dataSize));
+
+			byte[] buffer = new byte[2 + dataSize];
+
+			int cursor = 0;
+			Array.Copy(header, 0, buffer, cursor, header.Length);
+			cursor += header.Length;
+
+			Array.Copy(packetType, 0, buffer, cursor, packetType.Length);
+			cursor += packetType.Length;
+
+			Array.Copy(messageSize, 0, buffer, cursor, messageSize.Length);
+			cursor += messageSize.Length;
+
+			Array.Copy(message, 0, buffer, cursor, message.Length);
+			cursor += message.Length;
+
+			Array.Copy(nicknameSize, 0, buffer, cursor, nicknameSize.Length);
+			cursor += nicknameSize.Length;
+
+			Array.Copy(nickname, 0, buffer, cursor, nickname.Length);
+
+			return buffer;
+		}
+	}
+}

Chat/Core/PServer.cs

@@ -76,13 +76,13 @@ namespace Core
 				{
 					LoginRequestPacket requestPacket = new LoginRequestPacket(dataBuffer);
 					
-					Clients.TryAdd(requestPacket.Id, clientSocket);
+					bool result = Clients.TryAdd(requestPacket.Id, clientSocket);
 					Console.WriteLine($"[{DateTime.Now}] LoginRequest - Id: {requestPacket.Id}, Nickname: {requestPacket.NickName}");
 
 					id = requestPacket.Id;
 					nickname = requestPacket.NickName;
 
-					LoginResponsePacket responsePacket = new LoginResponsePacket(StatusCode.Success);
+					LoginResponsePacket responsePacket = new LoginResponsePacket(result ? StatusCode.Success : StatusCode.Failed);
 					await clientSocket.SendAsync(responsePacket.Serialize(), SocketFlags.None);
 				}
 				else if (packetType == PacketType.CreateRoomRequest)
@@ -169,6 +169,18 @@ namespace Core
 						}
 					}
 				}
+				else if (packetType == PacketType.Chat)
+				{
+					ChatPacket packet = new ChatPacket(dataBuffer);
+					if (Rooms.TryGetValue(roomName, out var room))
+					{
+						foreach (var user in room.Users)
+						{
+							if (Clients.TryGetValue(user.Key, out var otherClient))
+								await otherClient.SendAsync(packet.Serialize(), SocketFlags.None);
+						}
+					}
+				}
 			}
 		}
 	}

Chat/Core/PacketType.cs

@@ -18,5 +18,6 @@ namespace Core
 		EnterRoomResponse,
 		UserEnter,
 		UserLeave,
+		Chat
 	}
 }