Develop Reference

How to write working servers to the .txt file?

I have Pinger Application that gets all ping informations of servers written in the Servers.txt file
Half of them working servers, half of them not. I want to make my application write working servers to the another .txt file called WorkingServers.txt located in C:\Program Files\Servers folder
Here is my code:
using System;
using System.IO;
using System.Threading;
namespace AnchovyMultiPing
{
class Program
{
static void Main(string[] args)
{
var servers = File.ReadAllLines(#"C:\Program Files\Servers\Servers.txt");
foreach (var line in servers)
{
string currentServer = line;
if (args == null) throw new ArgumentNullException("args");
var waiter = new ManualResetEventSlim(false);
var pingData = new MultiPing(new[] { line }, waiter, 300);
waiter.Wait();
Console.WriteLine(pingData.GetPingInformation());
}
Console.WriteLine();
Console.WriteLine("- * - * - The Job is Done - * - * -");
Console.ReadLine();
}
}
}
and MultiPing.cs:
using System;
using System.Collections.Generic;
using System.Net.NetworkInformation;
using System.Text;
using System.Threading;
namespace AnchovyMultiPing
{
internal sealed class MultiPing : AbstractMultiPing
{
private int Timeout { get; set; }
private string[] Hosts { get; set; }
private int _count;
private ManualResetEventSlim Waiter { get; set; }
private readonly byte[] _buffer = Encoding.ASCII.GetBytes("aaa");
private Dictionary<string, long> _table = new Dictionary<string, long>();
private class Parameters
{
public String Host { get; set; }
public ManualResetEventSlim Event { get; set; }
}
public MultiPing(string[] hosts, ManualResetEventSlim waiter, int timeout = 12000)
{
Hosts = hosts;
Waiter = waiter;
Timeout = timeout;
RequestTime();
}
public override IMultiPings RequestTime()
{
try
{
_count = 0;
_table = new Dictionary<string, long>();
foreach (string host in Hosts)
{
using (var pingSender = new Ping())
{
pingSender.PingCompleted += PingCompletedCallback;
var options = new PingOptions(64, true);
try
{
pingSender.SendAsync(host, Timeout, _buffer, options,
new Parameters {Host = host, Event = Waiter});
}
catch
{
_count += 1;
if (_count == Hosts.Length)
Waiter.Set();
}
}
}
}
catch (MultiPingException ex)
{
Console.Write("RequestTime Exception");
Console.ReadKey();
}
return this;
}
//[MethodImpl(MethodImplOptions.Synchronized)] leaving this in favour of the operating system scheduler for better performance.
private void PingCompletedCallback(object sender, PingCompletedEventArgs e)
{
try
{
_count += 1;
PingReply reply = e.Reply;
if (reply != null && reply.Address != null && reply.Address.ToString() != "0.0.0.0")
{
if (_count > 0)
{
try
{
if (!_table.ContainsKey(reply.Address.ToString()))
_table.Add(((Parameters) e.UserState).Host, reply.RoundtripTime);
}
catch (NullReferenceException ex)
{
// catch null exception
throw new MultiPingException("Ping round trip time is null");
}
}
}
if (_count == Hosts.Length)
{
((Parameters) e.UserState).Event.Set();
}
if (e.Error != null)
{
Console.WriteLine("Ping failed:");
Console.WriteLine(e.Error.ToString());
((ManualResetEventSlim) e.UserState).Set();
}
}
catch (MultiPingException ex)
{
Console.Write("Exception");
Console.ReadKey();
}
}
public override String GetPingInformation()
{
var build = new StringBuilder();
foreach (string host in _table.Keys)
{
build.AppendLine(string.Format("{0} : {1}", host, _table[host]));
}
return build.ToString();
}
public override String GetIp()
{
string ip = "";
long time = -1L;
foreach (string host in _table.Keys)
{
long roundTime = _table[host];
if ((time == -1L) || (roundTime >= 0 && roundTime < time))
{
time = roundTime;
ip = host;
}
}
return ip;
}
}
}

Declare new string at the beginning var log = string.Empty; At the end of the iteration add the server name to it, if the ping is successful. I don't know how the MultiPing class looks like, so I added artificial IsSuccessful, but what I mean is something like this:
waiter.Wait();
if(pingData.IsSuccessful)
{
log += line;
}
Console.WriteLine(pingData.GetPingInformation());
Then as the last line of your program save everything to the other file.
File.AppendAllText("C:\Program Files\Servers\WorkingServers.txt", log);

Xamarin Loop (Thread) in Foreground Service not continue when device is unplugged

Hi i've a problem getting location each 1-5 minutes with a Foreground Service, when I unplug the device and turn off the screen, the thread stops but the service notification is visible all time,
how can i prevent this?
i was reading about to use AlarmManager (is a real solution), how can i do it ? or should only foreground service do it by self
this is my code:
using Android.App;
using Android.Content;
using Android.Locations;
using Android.OS;
using Android.Text.Format;
using Invima.VehiculosApp.ViewModels;
using Java.Util;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Xamarin.Essentials;
using Xamarin.Forms;
namespace Invima.VehiculosApp
{
[Service(Label = "LocationUpdatesService", Enabled = true, Exported = true)]
[IntentFilter(new string[] { "com.Antss.InvimaVehiculos.Service" })]
public class LocationService : Service
{
IBinder Binder;
public override IBinder OnBind(Intent intent)
{
return Binder;
}
public const int ServiceRunningNotifID = 9000;
Ruta ruta;
Thread hiloUbicacion;
private System.Timers.Timer timer;
public override void OnCreate()
{
Notification notif = DependencyService.Get<INotification>().ReturnNotif();
StartForeground(ServiceRunningNotifID, notif);
_ = TomarUbicaciones();
base.OnCreate();
}
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
string rutaStr = intent.GetStringExtra("ruta");
this.ruta = JsonConvert.DeserializeObject<Ruta>(rutaStr);
var autoEvent = new AutoResetEvent(false);
// i tried this but ... the same problem
timer = new System.Timers.Timer(30000);
timer.Elapsed += async (object sender, System.Timers.ElapsedEventArgs e) =>
{
using (HttpClient cl = new HttpClient())
{
await cl.GetAsync("https://webhook.site/a718fef4-769b-4871-87a8-ec1ccd83fc50");
}
};
timer.Start();
return StartCommandResult.Sticky;
}
public int TomarUbicaciones()
{
hiloUbicacion = new Thread(TomarUbicacionAsync);
hiloUbicacion.Start();
return 1;
}
int contador = 0;
public async void TomarUbicacionAsync()
{
while (true)
{
try
{
var request = new GeolocationRequest(GeolocationAccuracy.Medium);
var location = await Geolocation.GetLocationAsync(request);
if (location != null && ruta != null)
{
Console.WriteLine($"Latitude: {location.Latitude}, Longitude: {location.Longitude}, Altitude: {location.Altitude}");
App.BD.RutaUbicacion.Add(new RutaUbicacion
{
Fecha = DateTime.Now,
IdRuta = ruta.IdRuta,
Latitud = (decimal)location.Latitude,
Longitud = (decimal)location.Longitude,
Altitud = (decimal)location.Altitude
});
App.BD.SaveChanges();
App.Sincronizar();
}
Device.BeginInvokeOnMainThread(() =>
{
DependencyService.Get<IMessage>().ShortAlert("Done!");
});
}
catch (Exception ex)
{
}
Thread.Sleep(60000); // each minute
}
}
public override void OnDestroy()
{
try
{
hiloUbicacion.Abort();
}
catch { }
base.OnDestroy();
}
public override bool StopService(Intent name)
{
try
{
hiloUbicacion.Abort();
}
catch { }
return base.StopService(name);
}
}
}

Change a label on a form from another class

My problem might be a dumb one but after hours of searching, I have to ask you for help.
I have a WPF form LoginPage that features a Label ,(called AlertText) that displays messages to the user and I need to change his content from another class.
To change the content I use AlertText.Content = "content" and it works perfectly.
But when I'm on another class and I want to change it that doesn't do anything.
Both class are under the same namespace.
I've tried this :
LoginPage lg = new LoginPage();
lg.AlertText.Content = "content";
The object is created but the second line isn't executed.
I've tried to create a public function SetAlertText() in my LoginPage class but that doesn't worked either.
I made it static and called it by LoginPage.SetAlertText() but same problem persists.
I've added this in my LoginPage :
public static LoginPage instance;
public LoginPage()
{
instance = this;
}
And called it by
LoginPage.instance.SetAlertText();
and
LoginPage.instance.AlertText.Content = "content";
but neither worked.
I also tried :
public LoginPage()
{
instance = new LoginPage();
}
What can I do ?
Edit :
Here's the full code of both classes :
namespace TMClientWPF
{
/// <summary>
/// Logique d'interaction pour LoginPage.xaml
/// </summary>
public partial class LoginPage : Page
{
ClientTCP client;
bool isConnected = false;
public RegisterPage registerPage;
public static LoginPage instance;
public LoginPage()
{
instance = this;
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
AlertText.Content = "";
try
{
if (isConnected == false)
{
client = new ClientTCP();
client.Connect();
isConnected = true;
}
client.SEND_LOGINS(UsernameText.Text, PasswordText.Password.ToString());
}
catch (NullReferenceException)
{
AlertText.Visibility = Visibility.Visible;
AlertText.Content = "Failed to connect to server, please try again later.";
}
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
registerPage = new RegisterPage();
this.NavigationService.Navigate(registerPage);
}
private void Button_Click_2(object sender, RoutedEventArgs e)
{
Application.Current.Shutdown();
}
public void SetAlertText(string text)
{
AlertText.Visibility = Visibility.Visible;
AlertText.Content = "Welcome Home";
}
}
}
///////////////////////////////
namespace TMClientWPF
{
public class ClientHandlePackets
{
public static ByteBuffer playerBuffer;
private delegate void Packet_(byte[] data);
private static Dictionary<long, Packet_> packets;
private static long pLength;
public static void HandleData(byte[] data)
{
InitializePackets();
byte[] Buffer;
Buffer = (byte[])data.Clone();
if (playerBuffer == null)
{
playerBuffer = new ByteBuffer();
}
playerBuffer.WriteBytes(Buffer);
if (playerBuffer.Count() == 0)
{
playerBuffer.Clear();
return;
}
if (playerBuffer.Length() >= 8)
{
pLength = playerBuffer.ReadLong(false);
if (pLength <= 0)
{
playerBuffer.Clear();
return;
}
}
while (pLength > 0 & pLength <= playerBuffer.Length() - 8)
{
if (pLength <= playerBuffer.Length() - 8)
{
playerBuffer.ReadLong(); //read out the packet identifier
data = playerBuffer.ReadBytes((int)pLength); //get the full package length
HandleDataPackets(data);
}
pLength = 0;
if (playerBuffer.Length() >= 8)
{
pLength = playerBuffer.ReadLong(false);
if (pLength < 0)
{
playerBuffer.Clear();
return;
}
}
}
}
private static void HandleDataPackets(byte[] data)
{
long packetIdentifier;
ByteBuffer buffer;
Packet_ packet;
buffer = new ByteBuffer();
buffer.WriteBytes(data);
packetIdentifier = buffer.ReadLong();
buffer.Dispose();
if (packets.TryGetValue(packetIdentifier, out packet))
{
packet.Invoke(data);
}
}
private static void InitializePackets()
{
packets = new Dictionary<long, Packet_>();
packets.Add((long)ServerPackets.S_INFORMATION, PACKET_INFORMATION);
packets.Add((long)ServerPackets.S_EXECUTEMETHODONCLIENT, PACKET_EXECUTEMETHOD);
packets.Add((long)ServerPackets.S_LOGCALLBACK, Packet_LogCallback);
}
#region packets
private static void PACKET_INFORMATION(byte[] data)
{
ByteBuffer buffer = new ByteBuffer();
buffer.WriteBytes(data);
long packetIndentifier = buffer.ReadLong();
string msg1 = buffer.ReadString();
string msg2 = buffer.ReadString();
int level = buffer.ReadInteger();
buffer.Dispose();
ClientTCP.instance.SEND_THANKYOU();
}
private static void PACKET_EXECUTEMETHOD(byte[] data)
{
ClientTCP client = new ClientTCP();
}
private static void Packet_LogCallback(byte[] data)
{
ByteBuffer buffer = new ByteBuffer();
buffer.WriteBytes(data);
buffer.ReadLong();
string message = buffer.ReadString();
string username = buffer.ReadString();
buffer.Dispose();
if(message == "true")
{
// LoginPage.SetAlertText("Welcome Home.");
}
else
{
LoginPage lg = new LoginPage();
LoginPage.instance.SetAlertText("Invalid logins.");
}
}
#endregion
}
}

String building and form component access from class

Background
I am writing a program, which collects different events (key press, mouse position, and others) and sends a single string to a serial port.
There is a small part of the program, where a key is pressed, to control movement (forward - W key; left - A key, Forward-left - WA key).
When an event happens, a method is invoked, which grabs a numeric string and processes in the FinalStringClass Class. On the main form , there is a method, which assigns collected value to a label.
However, I am encountering a problem with code due to lack of experience in programming :(
Main Form:
Serial port;
FinalStringClass fstr;
public Form1()
{
InitializeComponent();
//... Serial port settings
timer.Start();
fstr = new FinalStringClass(UpdateLabel2);
}
public void UpdateLabel2(string x, string y, string speed, string mvm) //
{
label2.Text = "x: " + x + "y: " + y + "speed: " + speed + "mvm: " + mvm;
}
private void timer_Tick(object sender, EventArgs e)
{
var up = KeyboardInfo.GetKeyState(Keys.W);
var down = KeyboardInfo.GetKeyState(Keys.S);
var left = KeyboardInfo.GetKeyState(Keys.A);
var right = KeyboardInfo.GetKeyState(Keys.D);
if (left.IsPressed)
{
if (up.IsPressed == true) // if W and A keys are pressed, ->
{
fstr.mvmMethod("7"); // this method is triggered
return;
}
if (down.IsPressed)
{
fstr.mvmMethod("9");
return;
}
if (right.IsPressed)
{
fstr.mvmMethod("1");
return;
}
fstr.mvmMethod("4"); //if W key is pressed, then this method is triggered
}
//... (other if condition statements)
label2.Text = fstr.FinalStringBuilder();
port.Write(fstr.FinalStringBuilder());
}
External Class:
class FinalStringClass
{
private Action<string, string, string, string> updateLabel2;
Action<String> _x, _y, _speed, _mvm;
string xF, yF, speedF, mvmF;
public FinalStringClass(Action<string, string, string, string> updateLabel2)
{
this.updateLabel2 = updateLabel2;
}
public FinalStringClass(Action<String> x, Action<String> y, Action<String> speed, Action<String> mvm)
{
_x = x;
_y = y;
_speed = speed;
_mvm = mvm;
}
public void xMethod(string x)
{
_x(x);
xF = x;
}
public void yMethod(string y)
{
_y(y);
yF = y;
}
public void speedMethod(string speed)
{
_speed(speed);
speedF = speed;
}
public void mvmMethod(string mvm)
{
_mvm(mvm);
mvmF = mvm;
}
public string FinalStringBuilder()
{
return xF + yF + speedF + mvmF;
}
}
When working with a single parameter, everything works fine. But dealing with multiple parameters causes a problem :(
Example of working with a single parameter (full working code):
Main Form
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace FFApp
{
public partial class Form1 : Form
{
SerialPort port;
MyClass outside;
public Form1()
{
InitializeComponent();
timer.Start();
outside = new MyClass(UpdateLabel);
}
public void UpdateLabel(string str)
{
label1.Text = str;
}
private void init()
{
port = new SerialPort();
port.PortName = "COM1";
port.BaudRate = 115200;
try
{
port.Open();
}
catch (Exception e1)
{
MessageBox.Show(e1.Message);
}
}
public struct KeyStateInfo
{
private Keys key;
private bool isPressed;
private bool isToggled;
public KeyStateInfo(Keys key, bool ispressed, bool istoggled)
{
this.key = key;
isPressed = ispressed;
isToggled = istoggled;
}
public static KeyStateInfo Default
{
get
{
return new KeyStateInfo(Keys.None, false, false);
}
}
public Keys Key
{
get { return key; }
}
public bool IsPressed
{
get { return isPressed; }
}
public bool IsToggled
{
get { return isToggled; }
}
}
private void timer_Tick(object sender, EventArgs e)
{
var up = KeyboardInfo.GetKeyState(Keys.W);
var down = KeyboardInfo.GetKeyState(Keys.S);
var left = KeyboardInfo.GetKeyState(Keys.A);
var right = KeyboardInfo.GetKeyState(Keys.D);
Keyboard kb = new Keyboard();
if (left.IsPressed)
{
if (up.IsPressed == true)
{
outside.MyMethod("7");
return;
}
if (down.IsPressed)
{
outside.MyMethod("9");
return;
}
if (right.IsPressed)
{
outside.MyMethod("1");
return;
}
outside.MyMethod("4");
}
if (right.IsPressed)
{
if (up.IsPressed)
{
outside.MyMethod("6");
return;
}
if (down.IsPressed)
{
outside.MyMethod("8");
return;
}
if (left.IsPressed)
{
outside.MyMethod("1");
return;
}
outside.MyMethod("5");
}
if (up.IsPressed)
{
if (left.IsPressed)
{
outside.MyMethod("7");
return;
}
if (right.IsPressed)
{
outside.MyMethod("6");
return;
}
if (down.IsPressed)
{
outside.MyMethod("1");
return;
}
outside.MyMethod("2");
}
if (down.IsPressed)
{
if (left.IsPressed)
{
outside.MyMethod("9");
return;
}
if (right.IsPressed)
{
outside.MyMethod("8");
return;
}
if (up.IsPressed)
{
outside.MyMethod("9");
return;
}
outside.MyMethod("3");
}
if (!right.IsPressed && !left.IsPressed && !up.IsPressed && !down.IsPressed)
{
outside.MyMethod("1");
}
}
public class KeyboardInfo
{
[DllImport("user32")]
private static extern short GetKeyState(int vKey);
private KeyboardInfo()
{
}
public static KeyStateInfo GetKeyState(Keys key)
{
short keyState = GetKeyState((int)key);
int low = Low(keyState), high = High(keyState);
bool toggled = low == 1;
bool pressed = high == 1;
return new KeyStateInfo(key, pressed, toggled);
}
private static int High(int keyState)
{
return keyState > 0 ? keyState >> 0x10
: (keyState >> 0x10) & 0x1;
}
private static int Low(int keyState)
{
return keyState & 0xffff;
}
}
}
}
Class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace FFApp
{
class MyClass
{
Action<String> labelSetter;
public MyClass(Action<String> labelSetter)
{
this.labelSetter = labelSetter;
}
public string MyProperty { get; set; }
public void MyMethod(string text)
{
labelSetter(text);
MyProperty = text;
}
}
}
Or is it possible within this code, to get changing values (store in a variable), when pressed W/A/D/S/W+A/W+D etc keys in order to allow building final string? ex: string finalstring = x + y + speed + pressed_key;

Checking and editing a value in isolated storage in windows phone 7

I am trying to check for the word "Alarm" in my isolated storage before saving.
If the word "Alarm" is exist i will change the "Alarm" to "Alarm1" then if "Alarm1" is exist will change to "Alarm2".
How should i go about doing it?
Below is my code but it is not working:
if (labelTextBox.Text == "")
{
try
{
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
foreach (string label in storage.GetFileNames("*"))
{
MessageBox.Show(label);
}
}
}
catch (Exception)
{
}
int i = 0;
i++;
labelTextBox.Text = "Alarm" + i;
alarmLabel = (labelTextBox.Text.ToString()).Replace(" ", "_");
}

You could use the IsolatedStorageSettings.ApplicationSettings, which is more appropriated for object (e.r. string) handling.
I made a small sample which makes use of this class:
using System;
using System.IO.IsolatedStorage;
using System.Windows;
using Microsoft.Phone.Controls;
namespace SidekickWP7
{
public partial class Page1 : PhoneApplicationPage
{
const string MYALARM = "MyAlarm";
public Page1()
{
InitializeComponent();
Loaded += new RoutedEventHandler(Page1_Loaded);
}
void Page1_Loaded(object sender, RoutedEventArgs e)
{
int intAlarm = 0;
Int32.TryParse(Load(MYALARM).ToString(), out intAlarm);
intAlarm++;
MessageBox.Show(intAlarm.ToString());
Save(MYALARM, intAlarm);
}
private static object Load(string strKey)
{
object objValue;
if (IsolatedStorageSettings.ApplicationSettings.TryGetValue<object>(strKey, out objValue) == false)
{
objValue = String.Empty;
}
return objValue;
}
private static void Save(string strKey, object objValue)
{
IsolatedStorageSettings.ApplicationSettings[strKey] = objValue;
IsolatedStorageSettings.ApplicationSettings.Save();
}
}
}

try this:
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
int highestNumberFound = -1;
foreach (var fileName in store.GetFileNames())
{
if (fileName.StartsWith("alarm"))
{
if (fileName == "alarm")
{
if (highestNumberFound < 0)
{
highestNumberFound = 0;
}
}
else if (fileName.Length > 5)
{
int numb;
if (int.TryParse(fileName.Substring(5), out numb))
{
if (numb > highestNumberFound)
{
highestNumberFound = numb;
}
}
}
}
}
string toCreate = "alarm";
if (++highestNumberFound > 0)
{
toCreate += highestNumberFound.ToString();
}
store.CreateFile(toCreate);
}
Not pretty but it should work.
I storngly suspect that creating empty files with different names isn't the best way to achieve whatever it is that you're trying to do though.