C# 异步套接字：服务器因垃圾邮件而停止接收？
所以我一直在为学校作业开发聊天信使应用程序，我遇到了一堵隐喻墙 该应用程序允许您通过用户名登录到服务器，您可以从该用户名开始与其他用户聊天 在大多数情况下，它是工作的，它连接并且您可以发送消息。但是，当您尝试发送连续消息时，服务器似乎忽略了数据（因为数据是由客户端发送的），即使套接字仍然连接。在收到来自客户端的另一条消息之前，它不会确认此消息 这是该问题的视频： 我真的目瞪口呆，不知道如何处理这一点，所以任何和所有的帮助是非常感谢，如果我的代码是必要的，我会张贴它只是告诉我 编辑：我知道这是非常广泛的，我只是在寻找一些想法或方法，我可以尝试，希望让我走在正确的方向上 编辑2： 服务器接收代码段：C# 异步套接字：服务器因垃圾邮件而停止接收？,c#,sockets,asynchronous,C#,Sockets,Asynchronous,所以我一直在为学校作业开发聊天信使应用程序，我遇到了一堵隐喻墙 该应用程序允许您通过用户名登录到服务器，您可以从该用户名开始与其他用户聊天 在大多数情况下，它是工作的，它连接并且您可以发送消息。但是，当您尝试发送连续消息时，服务器似乎忽略了数据（因为数据是由客户端发送的），即使套接字仍然连接。在收到来自客户端的另一条消息之前，它不会确认此消息 这是该问题的视频： 我真的目瞪口呆，不知道如何处理这一点，所以任何和所有的帮助是非常感谢，如果我的代码是必要的，我会张贴它只是告诉我 编辑：我知道这是非常
private void OnReceive(IAsyncResult ar) //Used to interpret data sent to the Server
{
try
{
//MessageBox.Show("Receiving!");
Socket clientSocket = (Socket)ar.AsyncState; //Pass socket through beginReceive
clientSocket.EndReceive(ar); //Procedure complete
//Transform the array of bytes received from the user into an
//intelligent form of object Data
Data msgReceived = new Data(buffer);
//We will send this object in response the users request
Data msgToSend = new Data();
byte[] message;
//If the message is to login, logout, or simple text message
//then when send to others the type of the message remains the same
msgToSend.cmdCommand = msgReceived.cmdCommand;
msgToSend.strName = msgReceived.strName;
switch (msgReceived.cmdCommand)
{
case Command.Login:
//When a user logs in to the server then we add them to our
//list of clients
ClientInfo clientInfo = new ClientInfo();
clientInfo.socket = clientSocket;
clientInfo.strName = msgReceived.strName;
clientList.Add(clientInfo);
msgToSend.cmdCommand = Command.List; //Need to send back a list of clients
updateServer("<<<" + msgReceived.strName + " is now connected on: " + clientInfo.socket.LocalEndPoint + ">>>");
break;
case Command.Logout: //Currently not working
//When a user wants to log out of the server then we search for them
//in the list of clients and close the corresponding connection
int nIndex = 0;
foreach (ClientInfo client in clientList)
{
if (client.socket == clientSocket)
{
clientList.RemoveAt(nIndex);
break;
}
++nIndex;
}
clientSocket.Close(100);
updateServer("<<<" + msgReceived.strName + " has disconnected>>>");
msgToSend.cmdCommand = Command.List;
break;
case Command.Message:
//Set the text of the message that we will broadcast to desired user
updateServer(msgReceived.strMessage);
msgToSend.cmdCommand = Command.Message;
msgToSend.strMessage = msgReceived.strMessage;
msgToSend.strName = msgReceived.strName;
msgToSend.strCName = msgReceived.strCName; //the recievers name
break;
case Command.List:
break;
}
//Send the message back to the deisred client
if (msgToSend.cmdCommand == Command.Message)
{
message = msgToSend.ToByte();
foreach (ClientInfo client in clientList)
{
if (client.strName == msgReceived.strCName)
{
client.socket.BeginSend(message, 0, message.Length, SocketFlags.None, new AsyncCallback(OnSend), client.socket);
}
}
}
//Send a list of clients back to the client
if (msgToSend.cmdCommand == Command.List)
{
foreach (ClientInfo client in clientList)
{
msgToSend.strMessage += client.strName + "*";
}
msgToSend.strName = null;
message = msgToSend.ToByte();
foreach (ClientInfo client in clientList)
{
client.socket.BeginSend(message, 0, message.Length, SocketFlags.None, new AsyncCallback(OnSend), client.socket);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Server - OnReceive", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
//Invoked via chat clients and is used to send a message to the server
public void chat_sendMessage(string name, string contact, string message)
{
try
{
Data msgToSend = new Data(); //New data structure
msgToSend.cmdCommand = Command.Message; //Set command to Message as we are sending a message
msgToSend.strName = name; //Set sender name to parameter value: name
msgToSend.strMessage = message; //Set strMessage to parameter value: message
msgToSend.strCName = contact; //Set reciever Name to parameter value: contact
byte[] b = msgToSend.ToByte(); //Turn data structure into byte array
State.workSocket.BeginSend(b, 0, b.Length, SocketFlags.None, new AsyncCallback(OnSend), null); //Send using asynchronous socket (State.workSocket)
if (State.workSocket.Connected == false)
{
MessageBox.Show("Connection Lost :(");
}
State.workSocket.BeginReceive(State.buffer,
0,
State.buffer.Length,
SocketFlags.None,
new AsyncCallback(OnReceive),
State.buffer); //Listen to incoming data, uses State.buffer to store data
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Login Client - Send Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
enum Command
{
//Log into the server
Login,
//Logout of the server
Logout,
//Send a text message to all the chat clients
Message,
//Get a list of users in the chat room from the server
List,
//Null Value
Null
}
//The data structure by which the server and the client interact with
//each other
class Data
{
//Default constructor
public Data()
{
this.cmdCommand = Command.Null;
this.strMessage = null;
this.strName = null;
this.strCName = null;
}
//Converts the bytes into an object of type Data
public Data(byte[] data)
{
//The first four bytes are for the Command
this.cmdCommand = (Command)BitConverter.ToInt32(data, 0);
//The next four store the length of the name
int nameLen = BitConverter.ToInt32(data, 4);
//The next four store the length of the message
int msgLen = BitConverter.ToInt32(data, 8);
//The next four store the length of the client Name
int cnameLen = BitConverter.ToInt32(data, 12);
//This check makes sure that strName has been passed in the array of bytes
if (nameLen > 0)
this.strName = Encoding.UTF8.GetString(data, 16, nameLen);
else
this.strName = null;
//This checks for a null message field
if (msgLen > 0)
this.strMessage = Encoding.UTF8.GetString(data, 16 + nameLen, msgLen);
else
this.strMessage = null;
if (cnameLen > 0)
this.strCName = Encoding.UTF8.GetString(data, 16 + nameLen + msgLen, cnameLen);
else
this.strCName = null;
}
//Converts the Data structure into an array of bytes
public byte[] ToByte()
{
List<byte> result = new List<byte>();
//First four are for the Command
result.AddRange(BitConverter.GetBytes((int)cmdCommand));
//Add the length of the name
if (strName != null)
result.AddRange(BitConverter.GetBytes(strName.Length));
else
result.AddRange(BitConverter.GetBytes(0));
//Length of the message
if (strMessage != null)
result.AddRange(BitConverter.GetBytes(strMessage.Length));
else
result.AddRange(BitConverter.GetBytes(0));
//Length of the Client Name
if (strCName != null)
result.AddRange(BitConverter.GetBytes(strCName.Length));
else
result.AddRange(BitConverter.GetBytes(0));
//Add the name
if (strName != null)
result.AddRange(Encoding.UTF8.GetBytes(strName));
//Add the message text to our array of bytes
if (strMessage != null)
result.AddRange(Encoding.UTF8.GetBytes(strMessage));
//And, lastly we add the Client Name to our array of bytes
if (strCName != null)
result.AddRange(Encoding.UTF8.GetBytes(strCName));
return result.ToArray();
}
public string strName; //Name by which the client logs into the room
public string strMessage; //Message text
public string strCName; //Name of the desired recipient
public Command cmdCommand; //Command type (login, logout, send message, etcetera)
}
enum命令
{
//登录到服务器
登录，
//注销服务器
注销，
//向所有聊天客户端发送文本消息
消息
//从服务器获取聊天室中的用户列表
列表
//空值
无效的
}
//服务器和客户机与之交互的数据结构
//彼此
类数据
{
//默认构造函数
公共数据（）
{
this.cmdCommand=Command.Null；
this.strMessage=null；
this.strName=null；
this.strCName=null；
}
//将字节转换为数据类型的对象
公共数据（字节[]数据）
{
//前四个字节用于命令
this.cmdCommand=（命令）BitConverter.ToInt32（数据，0）；
//接下来的四个存储名称的长度
int nameLen=BitConverter.ToInt32（数据，4）；
//接下来的四个存储消息的长度
int msgLen=BitConverter.ToInt32（数据，8）；
//接下来的四个存储客户端名称的长度
int cnameLen=BitConverter.ToInt32（数据，12）；
//此检查确保strName已在字节数组中传递
如果（名称>0）
this.strName=Encoding.UTF8.GetString（数据，16，nameLen）；
其他的
this.strName=null；
//这将检查是否存在空消息字段
如果（msgLen>0）
this.strMessage=Encoding.UTF8.GetString（数据，16+nameLen，msgLen）；
其他的
this.strMessage=null；
如果（cnameLen>0）
this.strCName=Encoding.UTF8.GetString（数据，16+nameLen+msgLen，cnameLen）；
其他的
this.strCName=null；
}
//将数据结构转换为字节数组
公共字节[]ToByte（）
{
列表结果=新列表（）；
//前四个用于命令
AddRange（BitConverter.GetBytes（（int）cmdCommand））；
//添加名称的长度
if（strName！=null）
AddRange（BitConverter.GetBytes（strName.Length））；
其他的
result.AddRange（BitConverter.GetBytes（0））；
//信息的长度
if（strMessage！=null）
AddRange（BitConverter.GetBytes（strMessage.Length））；
其他的
result.AddRange（BitConverter.GetBytes（0））；
//客户端名称的长度
if（strCName！=null）
AddRange（BitConverter.GetBytes（strCName.Length））；
其他的
result.AddRange（BitConverter.GetBytes（0））；
//添加名称
if（strName！=null）
AddRange（Encoding.UTF8.GetBytes（strName））；
//将消息文本添加到字节数组中
if（strMessage！=null）
AddRange（Encoding.UTF8.GetBytes（strMessage））；
//最后，我们将客户端名称添加到字节数组中
if（strCName！=null）
AddRange（Encoding.UTF8.GetBytes（strCName））；
返回result.ToArray（）；
}
public string strName；//客户端登录文件室时使用的名称
公共字符串strMessage；//消息文本
公共字符串strCName；//所需收件人的名称
公共命令cmdCommand；//命令类型（登录、注销、发送消息等）
}
EndReceive您的代码是否可以允许逐字节接收所有数据，或者一次接收一小时的数据？它必须是。您能分享一些用于阅读/发送邮件的代码片段吗？你能将这种行为提取到一个示例程序中吗？@Jeroenvanevel嘿，我用一些相关的片段更新了我的问题（抱歉，它们太长了）。不幸的是，我已经能够在一个示例程序中复制该问题，它似乎是我的聊天messenger所独有的：（我已经添加了用于在客户端和服务器之间读/写消息的数据标准，它说明了字节长度以及所有不确定这是否是您的意思的内容。很抱歉不知道。您的代码是否能够容忍逐字节接收所有数据？如果Receive每次返回一个字节，您的代码是否工作？@usr+1因为，如果它可以不，它将永远不可靠。@usr我实际上不确定我将如何设置这样的测试，是否有任何示例项目在某处？
enum Command
{
//Log into the server
Login,
//Logout of the server
Logout,
//Send a text message to all the chat clients
Message,
//Get a list of users in the chat room from the server
List,
//Null Value
Null
}
//The data structure by which the server and the client interact with
//each other
class Data
{
//Default constructor
public Data()
{
this.cmdCommand = Command.Null;
this.strMessage = null;
this.strName = null;
this.strCName = null;
}
//Converts the bytes into an object of type Data
public Data(byte[] data)
{
//The first four bytes are for the Command
this.cmdCommand = (Command)BitConverter.ToInt32(data, 0);
//The next four store the length of the name
int nameLen = BitConverter.ToInt32(data, 4);
//The next four store the length of the message
int msgLen = BitConverter.ToInt32(data, 8);
//The next four store the length of the client Name
int cnameLen = BitConverter.ToInt32(data, 12);
//This check makes sure that strName has been passed in the array of bytes
if (nameLen > 0)
this.strName = Encoding.UTF8.GetString(data, 16, nameLen);
else
this.strName = null;
//This checks for a null message field
if (msgLen > 0)
this.strMessage = Encoding.UTF8.GetString(data, 16 + nameLen, msgLen);
else
this.strMessage = null;
if (cnameLen > 0)
this.strCName = Encoding.UTF8.GetString(data, 16 + nameLen + msgLen, cnameLen);
else
this.strCName = null;
}
//Converts the Data structure into an array of bytes
public byte[] ToByte()
{
List<byte> result = new List<byte>();
//First four are for the Command
result.AddRange(BitConverter.GetBytes((int)cmdCommand));
//Add the length of the name
if (strName != null)
result.AddRange(BitConverter.GetBytes(strName.Length));
else
result.AddRange(BitConverter.GetBytes(0));
//Length of the message
if (strMessage != null)
result.AddRange(BitConverter.GetBytes(strMessage.Length));
else
result.AddRange(BitConverter.GetBytes(0));
//Length of the Client Name
if (strCName != null)
result.AddRange(BitConverter.GetBytes(strCName.Length));
else
result.AddRange(BitConverter.GetBytes(0));
//Add the name
if (strName != null)
result.AddRange(Encoding.UTF8.GetBytes(strName));
//Add the message text to our array of bytes
if (strMessage != null)
result.AddRange(Encoding.UTF8.GetBytes(strMessage));
//And, lastly we add the Client Name to our array of bytes
if (strCName != null)
result.AddRange(Encoding.UTF8.GetBytes(strCName));
return result.ToArray();
}
public string strName; //Name by which the client logs into the room
public string strMessage; //Message text
public string strCName; //Name of the desired recipient
public Command cmdCommand; //Command type (login, logout, send message, etcetera)
}