在单击按钮关闭表单之前，我需要停止对服务器进行ping操作...我该怎么做? [英] I need to stop pinging my server before closing my form with a button click...how do i do this?

问题描述

我问这个问题的原因很简单……我的应用程序中有一个部分可以ping ip地址或网址...并且如果我单击"x"按钮，在窗体上关闭它....它引发一个错误....所以我需要一个取消按钮来取消ping，然后再关闭窗体..任何 想法?检查代码，我必须查看我们是否可以在此处为button1隐含某些内容.在退出表单之前单击以停止ping....我还想添加一条消息，告诉用户ping是成功"的. ;因此，如果您可以在我的代码中看到 我可以把这条信息放在那也将是超级有帮助的.请仅以C#代码回复！谢谢！

I ask this question for 1 simple reason...... i have a section of my app that pings ip address or web addresses...and if i click the "x" on the form to close it....it throws an error....so i need a cancel button to cancel the ping prior to closing the form....any ideas? check the code that i have to see if we can impliment something here for a button1 click to stop the ping prior to exiting the form....and i also i want to add a message telling the user that the ping was "successfull" so if you can see in my code where i can put this message at that would be super helpfull too. Please only respond with C# code thanks!!

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Threading;

using System.Net.NetworkInformation;

using System.Runtime.InteropServices;



namespace Access_Honeywell_V8

{

 



 public partial class ping : Form

 {

  //Constants

  const int AW_SLIDE = 0X40000;

  const int AW_HOR_POSITIVE = 0X1;

  const int AW_HOR_NEGATIVE = 0X2;

  const int AW_BLEND = 0X80000;

  const int AW_HIDE = 0x1;

  [DllImport("user32")]

  static extern bool AnimateWindow(IntPtr hwnd, int time, int flags);



  // Counts the pings

  private int pingsSent;

  // Can be used to notify when the operation completes

  AutoResetEvent resetEvent = new AutoResetEvent(false);

 // this is where i receive the data from the extrasiteinfo form



  public ping(TextBox t)

  {

   InitializeComponent();

   this.txtIP.Text = t.Text;

  }



  public ping()

  {

   InitializeComponent();

  }





  protected override void OnLoad(EventArgs e)

  {

   //Load the Form At Position of Main Form

   int WidthOfMain = Application.OpenForms["MainForm"].Width;

   int HeightofMain = Application.OpenForms["MainForm"].Height;

   int LocationMainX = Application.OpenForms["MainForm"].Location.X;

   int locationMainy = Application.OpenForms["MainForm"].Location.Y;



   //Set the Location

   this.Location = new Point(LocationMainX + WidthOfMain, locationMainy + 1);



   //Animate form

   AnimateWindow(this.Handle, 500, AW_SLIDE | AW_HOR_POSITIVE);

  }



  private void btnPing_Click(object sender, EventArgs e)

  {

   // Reset the number of pings

   pingsSent = 0;

   // Clear the textbox of any previous content

   txtResponse.Clear();

   txtResponse.Text += "Pinging " + txtIP.Text + " with 32 bytes of data:\r\n\r\n";

   // Send the ping

   SendPing();

  }



  private void SendPing()

  {

   System.Net.NetworkInformation.Ping pingSender = new System.Net.NetworkInformation.Ping();



   // Create an event handler for ping complete

   pingSender.PingCompleted += new PingCompletedEventHandler(pingSender_Complete);



   // Create a buffer of 32 bytes of data to be transmitted.

   byte[] packetData = Encoding.ASCII.GetBytes("................................");



   // Jump though 50 routing nodes tops, and don't fragment the packet

   PingOptions packetOptions = new PingOptions(50, true);



   // Send the ping asynchronously

   pingSender.SendAsync(txtIP.Text, 5000, packetData, packetOptions, resetEvent);

  }



  private void pingSender_Complete(object sender, PingCompletedEventArgs e)

  {

   // If the operation was canceled, display a message to the user.

   if (e.Cancelled)

   {

    txtResponse.Text += "Ping was canceled...\r\n";



    // The main thread can resume

    ((AutoResetEvent)e.UserState).Set();

   }

   else if (e.Error != null)

   {

    txtResponse.Text += "An error occured: " + e.Error + "\r\n";



    // The main thread can resume

    ((AutoResetEvent)e.UserState).Set();

   }

   else

   {

    PingReply pingResponse = e.Reply;

    // Call the method that displays the ping results, and pass the information with it

    ShowPingResults(pingResponse);

   }

  }



  public void ShowPingResults(PingReply pingResponse)

  {

   if (pingResponse == null)

   {

    // We got no response

    txtResponse.Text += "There was no response.\r\n\r\n";

    return;

   }

   else if (pingResponse.Status == IPStatus.Success)

   {

    // We got a response, let's see the statistics

    txtResponse.Text += "Reply from " + pingResponse.Address.ToString() + ": bytes=" + pingResponse.Buffer.Length + " time=" + pingResponse.RoundtripTime + " TTL=" + pingResponse.Options.Ttl + "\r\n";

   }

   else

   {

    // The packet didn't get back as expected, explain why

    txtResponse.Text += "Ping was unsuccessful: " + pingResponse.Status + "\r\n\r\n";

   }

   // Increase the counter so that we can keep track of the pings sent

   pingsSent++;

   // Send 4 pings

   if (pingsSent < 4)

   {

    SendPing();

   }

  }

 }

}

推荐答案

我在这里猜测，但是这样做会释放资源，这可能会导致您在点击"X"时出错按钮?

I'm guessing here but would something like this work to release the resources which may be causing your error on hitting the 'X' button?

这是一篇有关异步发送时内存泄漏的文章:http://chicknet.blogspot.com/2006/11/ping-memory-leak.html

Here is an article on memory leaks while sending asynchronously: http://chicknet.blogspot.com/2006/11/ping-memory-leak.html

他们似乎建议将以下内容放在ping_completed回调的末尾.只是一个猜测.

They suggest, it seems, to put the following at the end of the ping_completed callback. Just a guess.

((IDisposable)pingSender).Dispose();

这篇关于在单击按钮关闭表单之前，我需要停止对服务器进行ping操作...我该怎么做?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！