CODEWITHSUNDEEP
c#c#-4.0
Zaid
Zaid

Reputation: 31

Measuring the time between keydown and keyup events

I am trying to capture the timing in millisecond between the KeyDown and KeyUp, the elapsed time between those two events for each typed character, I used Stopwatch.GetTimestamp() since I need to acquire a high-resolution time stamps, as shown in the coding below, and I wonder if this is the correct equation to get the time in millisecond:

int timeStampInMiliseconds = Convert.ToInt32(elapsedTicks * 1000000 / Stopwatch.Frequency); for getting the time in millisecond.

Since the timing results does not show any consistency and could reach up to 5 seconds between those two events, which is not realistic!! 

public partial class Form1 : Form
{
    long timeStamp;
    long initialTimeStamp;


    public Form1()
    {

        InitializeComponent();
        Stopwatch stopWatch = new Stopwatch();
         // Uses the second Core or Processor for the Test
        // Prevents "Normal" processes from interrupting Threads
        // Prevents "Normal" Threads  
        initialize();

    }

    public void initialize()
    {
        //
    }

    public void textBox1_KeyDown(object sender, KeyEventArgs e)
    {

        initialTimeStamp = Stopwatch.GetTimestamp();
    }

    public void textBox1_KeyUp(object sender, KeyEventArgs e)
    {
        timeStamp = Stopwatch.GetTimestamp();

        long elapsedTicks = timeStamp  -initialTimeStamp;

        int timeStampInMiliseconds = Convert.ToInt32(elapsedTicks * 1000000 / Stopwatch.Frequency);
    }
}

Really appreciating your help.

Upvotes: 0

Views: 696

Answers (2)

Racil Hilan
Racil Hilan

Reputation: 25351

You don't need to use the Stopwatch. It is much easier to get a timestamp using:

long t = DateTime.Now.Ticks;

Try this:

public void textBox1_KeyDown(object sender, KeyEventArgs e)
{
    initialTimeStamp = DateTime.Now.Ticks;
}

public void textBox1_KeyUp(object sender, KeyEventArgs e)
{
    timeStamp = DateTime.Now.Ticks;

    long elapsedTicks = timeStamp - initialTimeStamp;

    long timeStampInNanoseconds = elapsedTicks * 100;
}

I did it in Nanoseconds for more accuracy, but you can convert to Milliseconds if you like:

long timeStampInMiliseconds = elapsedTicks / 10000;

Upvotes: 0

Yacoub Massad
Yacoub Massad

Reputation: 27861

A better way to do this is to use the StopWatch.ElapsedMilliseconds property.

In the textBox1_KeyDown event handler, simply restart the stop watch like this:

stopWatch.Restart();

And in the textBox1_KeyUp event handler, read the ElapsedMilliseconds property like this:

long timeStampInMiliseconds = stopWatch.ElapsedMilliseconds;

You also need to make the stopWatch an instance variable like this:

public partial class Form1 : Form
{
    long timeStamp;
    long initialTimeStamp;
    Stopwatch stopWatch;

    public Form1()
    {

        InitializeComponent();
        stopWatch = new Stopwatch();

        ....

    }
    ....
}

Upvotes: 3

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