チャット プログラムを作成するための古いチュートリアルに従っており、新しいフォームに適合するように分析してきましたが、意図したとおりに機能するようになりましたが、次のエラーが発生します。「トランスポートからデータを読み取ることができません。接続: WSACancelBlockingCall の呼び出しによってブロック操作が中断されました。」
コードのこの部分を指します。
while (Connected)
{
// Show the messages in the log TextBox
this.Invoke(new UpdateLogCallback(this.UpdateLog), new object[] { srReceiver.ReadLine() });
}
クライアントを閉じるか、切断するときにのみエラーが発生します。
これは、クライアント コードの大部分です。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;
namespace Table_Top_RPG
{
public partial class Connect : Form
{
// Will hold the user name
private string UserName = "Unknown";
public static StreamWriter swSender;
private StreamReader srReceiver;
private TcpClient tcpServer;
// Needed to update the form with messages from another thread
private delegate void UpdateLogCallback(string strMessage);
// Needed to set the form to a "disconnected" state from another thread
private delegate void CloseConnectionCallback(string strReason);
private Thread thrMessaging;
private IPAddress ipAddr;
private bool Connected;
public Connect()
{
// On application exit, don't forget to disconnect first
Application.ApplicationExit += new EventHandler(OnApplicationExit);
InitializeComponent();
}
private void BtnConnect_Click(object sender, EventArgs e)
{
// If we are not currently connected but awaiting to connect
if (Connected == false)
{
InitializeConnection();
}
else // We are connected, thus disconnect
{
CloseConnection("Disconnected at user's request.");
}
}
// The event handler for application exit
public void OnApplicationExit(object sender, EventArgs e)
{
if (Connected == true)
{
// Closes the connections, streams, etc.
Connected = false;
swSender.Close();
srReceiver.Close();
tcpServer.Close();
}
}
private void InitializeConnection()
{
// Parse the IP address from the TextBox into an IPAddress object
ipAddr = IPAddress.Parse(Connect.IpBox.Text);
// Start a new TCP connections to the chat server
tcpServer = new TcpClient();
tcpServer.Connect(ipAddr, int.Parse(Connect.PortBox.Text));
// Helps us track whether we're connected or not
Connected = true;
// Prepare the form
UserName = Connect.NameBox.Text;
// Disable and enable the appropriate fields
IpBox.Enabled = false;
NameBox.Enabled = false;
Main.TxtMsg.Enabled = true;
Connect.BtnConnect.Text = "Disconnect";
// Send the desired username to the server
swSender = new StreamWriter(tcpServer.GetStream());
swSender.WriteLine(UserName);
swSender.Flush();
// Start the thread for receiving messages and further communication
thrMessaging = new Thread(new ThreadStart(ReceiveMessages));
thrMessaging.Start();
}
private void ReceiveMessages()
{
// Receive the response from the server
srReceiver = new StreamReader(tcpServer.GetStream());
// If the first character of the response is 1, connection was successful
string ConResponse = srReceiver.ReadLine();
// If the first character is a 1, connection was successful
if (ConResponse[0] == '1')
{
// Update the form to tell it we are now connected
this.Invoke(new UpdateLogCallback(this.UpdateLog), new object[] { "Connected Successfully!" });
}
else // If the first character is not a 1 (probably a 0), the connection was unsuccessful
{
string Reason = "Not Connected: ";
// Extract the reason out of the response message. The reason starts at the 3rd character
Reason += ConResponse.Substring(2, ConResponse.Length - 2);
// Update the form with the reason why we couldn't connect
this.Invoke(new CloseConnectionCallback(this.CloseConnection), new object[] { Reason });
// Exit the method
return;
}
// While we are successfully connected, read incoming lines from the server
while (Connected)
{
// Show the messages in the log TextBox
this.Invoke(new UpdateLogCallback(this.UpdateLog), new object[] { srReceiver.ReadLine() });
}
}
internal void CloseConnection(string Reason)
{
// Show the reason why the connection is ending
Main.ChatLog.AppendText(Reason + "\r\n");
// Enable and disable the appropriate controls on the form
IpBox.Enabled = true;
NameBox.Enabled = true;
Main.TxtMsg.Enabled = false;
BtnConnect.Text = "Connect";
// Close the objects
Connected = false;
swSender.Close();
srReceiver.Close();
tcpServer.Close();
}
// This method is called from a different thread in order to update the log TextBox
private void UpdateLog(string strMessage)
{
// Append text also scrolls the TextBox to the bottom each time
Main.ChatLog.AppendText(strMessage + "\r\n");
}
}
}
すべてのチャット ダイアログが送信される Main という別のフォームがありますが、そのコードの大部分は関係ありません。
誰かがこれを処理するためのより良い方法を知っているか、優れたチャット プログラムのチュートリアルを知っている場合は、クライアントの接続と切断がクラッシュすることなく適切に処理される方法のより良い例を調べることができます。