DateDiff() in c#?

[Andy90]

There is DateDiff() function in VB.NET but which function is equivalent to it in c#?

I m facing problem in converting this vb.net code to c#

Private LastPointWhenClicked As Point
     
    Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
    If LastPoint = Cursor.Position AndAlso LastPointWhenClicked <> Cursor.Position Then
    If DateDiff(DateInterval.Second, LastTimeMoved, Now) >= 2 Then
     
    LastPoint = New Point(Integer.MinValue, Integer.MinValue)
    LastPointWhenClicked = Cursor.Position
     
    End If
     
    Else
     
    LastPoint = Cursor.Position
    LastTimeMoved = Now
     
    End If
     
    End Sub

[thines01]

I would use TimeSpan.

using System;

namespace DW_401369
{
   class Program
   {
      static void Main(string[] args)
      {
         DateTime dtLastYear = new DateTime(2010, 12, 25);
         DateTime dtThisYear = new DateTime(2011, 12, 25);
         TimeSpan tsDiff = dtThisYear - dtLastYear;

         Console.WriteLine(tsDiff.Days);//365
      }
   }
}

[Andy90]

But how to find time difference in seconds?

[thines01]

Here are both examples (using TimeSpan)

using System;

namespace DW_401369
{
   class Program
   {
      private static void ShowDaysInOneYear()
      {
         DateTime dtLastYear = new DateTime(2010, 12, 25);
         DateTime dtThisYear = new DateTime(2011, 12, 25);
         TimeSpan tsDiff = dtThisYear - dtLastYear;

         Console.WriteLine(tsDiff.Days);//365
      }

      private static void ShowSpinner(ushort numSeconds)
      {
         char[] arr_chrSpinner = new char[4] { '-', '\\', '|', '/' };

         DateTime dtNumSecondsFromNow = (DateTime.Now + new TimeSpan(0, 0, (int)numSeconds));

         uint uintLooper = 0;
         while (DateTime.Now < dtNumSecondsFromNow)
         {
            Console.Write("{0}{1}",
               arr_chrSpinner[uintLooper++ % arr_chrSpinner.Length], '\b');
         }
      }

      static void Main(string[] args)
      {
         ShowDaysInOneYear();
         ShowSpinner(2); // show a spinner on the console for two seconds
      }
   }
}

[Andy90]

@thines
I m trying to build an application in c# where user moves mouse pointer at particular location and if the user doesnt move the mouse pointer from that location(i.e cursor coordinates does not change) for 2 seconds then action will be initiated.

help me with this how do i start? I m facing problem in timing!

[thines01]

...It's really the same thing -- counting for seconds to
1) Make something happen
2) Test to see if something happened

The concept is:
1) Set a bool to say the mouse has not been moved (set it to false)
2) Start the timer (while loop) checking for both time expiration AND mouse move
-if mouse has been moved, set the bool to true and "break"
-if mouse has not been moved, leave the bool set to false (let timer expire)
3) Take negative action if bool is still false

[Andy90]

Hey @thines...
still need your help!

Here is my code...

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;

namespace mousy
{
    public partial class Form1 : Form
    {
        public Point pt;
        public Point lastpt;
        public DateTime t;
        

        public Form1()
        {
            
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            lastpt = Cursor.Position;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
           
                       
            DateTime dtNumSecondsFromNow = (DateTime.Now + new TimeSpan(0, 0, (int)(2)));
            if((lastpt == Cursor.Position) && pt!=Cursor.Position)
            {
                if (t < dtNumSecondsFromNow) 
                {
                    MessageBox.Show("Tada");
                    lastpt = new Point(Int16.MinValue, Int16.MinValue);
                    pt = Cursor.Position;

                }
               
            }
            else
                {

                    lastpt = Cursor.Position;
                    t = DateTime.Now;

                }
                                       

            
        }
    }
}

The problem with this code is that when I wait for a sec it keeps displaying the message box (action) until I again move my mouse!
I want the message box to be displayed only once if my cursor position doesnt change for 2 sec(or any specified seconds)

Please check! and suggest changes!

I have set timer1 interval to 200 milliseconds!

And Thankyou for helping me with this I m learning alot because of you!

[thines01]

If you put that call to DateTime.Now inside that timer function, it will continue to reset every time the timer runs and it will never expire.

[Andy90]

line no. 40 keeps on executing if I stop the cursor movement! I want it to be execute only one time.

[thines01]

How are you starting and stopping the timer?
I also need to make sure I understand your design.
When your form opens, you're giving the user 2 seconds to move the mouse or message pops up, right?

If they move the mouse, is the problem solved or do they need to keep moving it in < 2-second increments?

...otherwise...
I scaled back the example and used this:

using System;
using System.Drawing;
using System.Windows.Forms;

namespace DW_401369_WF
{
   public partial class Form1 : Form
   {
      public Point curPosPrevious;
      private DateTime dtNumSecondsFromNow = (DateTime.Now + new TimeSpan(0, 0, (int)(2)));

      public Form1()
      {
         InitializeComponent();
      }

      private void Form1_Load(object sender, EventArgs e)
      {
         curPosPrevious = Cursor.Position;
         timer1.Start();
      }

      private void timer1_Tick_1(object sender, EventArgs e)
      {
         if (curPosPrevious == Cursor.Position)
         {
            if (DateTime.Now >= dtNumSecondsFromNow)
            {
               timer1.Stop();
               MessageBox.Show("Tada");
            }
         }
         else
         {
            timer1.Stop();
         }
      }
   }
}

[Andy90]

when the form opens, user can move cursor anywhere on screen and when the user stops cursor movement(new cursor coordinates) for 2 sec then
a message will pop up! then again user will move the cursor and when the user doesnt move the cursor for 2 sec again the same message will pop!
it is continued until form is closed!

[thines01]

OK.

using System;
using System.Drawing;
using System.Windows.Forms;

namespace DW_401369_WF
{
   public partial class Form1 : Form
   {
      public Point curPosPrevious = Cursor.Position;
      private DateTime dtNumSecondsFromNow = (DateTime.Now + new TimeSpan(0, 0, (int)(2)));

      public Form1()
      {
         InitializeComponent();
      }

      private void Form1_Load(object sender, EventArgs e)
      {
         Reset();
      }

      private void Reset()
      {
         dtNumSecondsFromNow = (DateTime.Now + new TimeSpan(0, 0, (int)(2)));
         timer1.Start();
         curPosPrevious = Cursor.Position;
      }

      private void timer1_Tick_1(object sender, EventArgs e)
      {
         if (curPosPrevious == Cursor.Position)
         {
            if (DateTime.Now >= dtNumSecondsFromNow)
            {
               timer1.Stop();
               MessageBox.Show("Tada");
               Reset();
            }
         }
         else
         {
            Reset();
         }
      }
   }
}

[In the Designer.cs]
You might also want to stop the timer when the form closes in an event handler like:

this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.MyFormClosing);

[...and also in the Form1.cs]

private void MyFormClosing(object sender, FormClosingEventArgs e)
{
   timer1.Stop();
}

[Andy90]

Thankyou @thines

This works perfectly but if I m at same cursor position for 2 sec or more the message keeps popping up until i move my cursor!

private void timer1_Tick(object sender, EventArgs e)
        {
            if (curPosPrevious == Cursor.Position)
            {
                if (DateTime.Now >= dtNumSecondsFromNow)
                {
                    timer1.Stop();
                    System.Media.SystemSounds.Beep.Play();
                    Reset();
                }
            }
            else
            {
                Reset();
            }
        }

For example for this code if I stop moving my cursor it will play a beep sound repeatedly after every 2 sec.

I want to know how to play beep sound only once when cursor position does not change for 2 sec.

[Andy90]

I got it! Thank you very much Tom!