Capturing a timers time?

**rory-uk** · Feb 8th, 2010, 08:44 AM

The below is my program so far

Code:

Public Class Form1

    Private Display As Boolean
    Private WithEvents tmr As Windows.Forms.Timer
    Private NewChar As Char
    Private fnt As New Font(Me.Font.FontFamily, 72, FontStyle.Bold, GraphicsUnit.Point)

    Public Sub New()

        ' This call is required by the Windows Form Designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        tmr = New Windows.Forms.Timer
        tmr.Interval = 5000 ' 5 seconds = 5000 milliseconds

    End Sub

    Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown

        Display = False
        Me.Invalidate()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Me.KeyPreview = True
        tmr.Enabled = True

    End Sub

    'What happens after 5000 ms
    Private Sub Timer_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles tmr.Tick

        ' Make static so that the random is not seeded every time
        Static r As New Random

        ' Get a random number between A(65) and Z(90).
        NewChar = Chr(r.Next(65, 90))

        ' Make sure screen gets repainted
        Me.Invalidate()

        ' Stop the timer so that it doesn't fetch the next character automatically
        tmr.Stop()

    End Sub

    ' Stopping and restarting timer
    Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
        If (Char.ToUpper(e.KeyChar) = NewChar) Then
            'Start the timer so that the next character is shown in 5 seconds

            NewChar = ControlChars.NullChar   ' < --------------------------

            Me.Invalidate()
            tmr.Start()

        End If
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click


        'Start the timer so that the next character is shown in 5 seconds
        tmr.Start()

        Display = True
        Me.Invalidate()

    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        If Display Then Dim textSize As SizeF = e.Graphics.MeasureString(NewChar, fnt)
        If NewChar = ControlChars.NullChar Then Exit Sub
        e.Graphics.DrawString(NewChar, fnt, Brushes.Red, x:=50, y:=50)

    End Sub

    Protected Overrides Sub Finalize()
        MyBase.Finalize()
    End Sub
End Class

Upon clicking the button a series of letters are displayed to the screen.

I would like to be able to capture the time taken to press the letter shown.
Is there any way of doing this?

E.g capturing the results in a textbox?

**cicatrix** · Feb 8th, 2010, 08:58 AM

On the class level declare these variables:

Code:

Private TimerStart As DateTime
Private TimePassed As TimeSpan

When you invoke tmr.Start, immediately save the current time to the variable:

Code:

TimerStart = Now

Whenever you want to measure the time passed from the TimerStart time just subtract the TimerStart from current time:"

Code:

TimePassed = Now - TimerStart
Textbox1.Text = TimePassed.ToString

**dbasnett** · Feb 8th, 2010, 09:47 AM

Use a stopwatch.

Code:

    Dim stpw As New Stopwatch
    Private Sub displayLetterCode()
        '
        'your code to display letter
        '
        stpw.Reset()
        stpw.Start()
    End Sub

    Private Sub LetterWasPressedCode()
        '
        '
        '
        stpw.Stop()
        'stpw.Elapsed is a TimeSpan that will have how much time Elapsed
    End Sub

**rory-uk** · Feb 8th, 2010, 10:15 AM

Using the code below seems to add the time for the period between the two letters - I'm trying to just get the time from the letter being shown to the letter being pressed.

Whereabouts should I be putting the code?

Thanks

Code:

Public Class Form1

    Private Display As Boolean
    Private WithEvents tmr As Windows.Forms.Timer
    Private NewChar As Char
    Private fnt As New Font(Me.Font.FontFamily, 72, FontStyle.Bold, GraphicsUnit.Point)
    Dim MyRandom As New Random
    Private TimerStart As DateTime
    Private TimePassed As TimeSpan


    Public Sub New()


        ' This call is required by the Windows Form Designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        tmr = New Windows.Forms.Timer
        tmr.Interval = 10000

    End Sub

    Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown

        Display = False
        Me.Invalidate()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Me.KeyPreview = True
        tmr.Enabled = True

    End Sub

    Private Sub Timer_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles tmr.Tick

        Static r As New Random

        'Get a random time between 7 and 20 seconds for the timer
        tmr.Interval = MyRandom.Next(7, 21) * 1000

        ' Get a random number between A(65) and Z(90).
        NewChar = Chr(r.Next(65, 91))

        ' Make sure screen gets repainted
        Me.Invalidate()

        ' Stop the timer so that it doesn't fetch the next character automatically
        tmr.Stop()

        TimePassed = Now - TimerStart
        txtRecord.Text = TimePassed.ToString


    End Sub

    ' Stopping and restarting timer
    Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
        If (Char.ToUpper(e.KeyChar) = NewChar) Then

            NewChar = ControlChars.NullChar

            Me.Invalidate()
            tmr.Start()

            TimerStart = Now
        End If
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        tmr.Start()

        TimerStart = Now

        Display = True
        Me.Invalidate()

    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint

        If Display Then Dim textSize As SizeF = e.Graphics.MeasureString(NewChar, fnt)
        If NewChar = ControlChars.NullChar Then Exit Sub
        e.Graphics.DrawString(NewChar, fnt, Brushes.Red, x:=50, y:=50)

    End Sub

    Protected Overrides Sub Finalize()
        MyBase.Finalize()
    End Sub
End Class

**dbasnett** · Feb 8th, 2010, 10:48 AM

try this

Code:

Public Class Form1

    Private Display As Boolean
    Private WithEvents tmr As Windows.Forms.Timer
    Private NewChar As Char
    Private fnt As New Font(Me.Font.FontFamily, 72, FontStyle.Bold, GraphicsUnit.Point)
    Dim MyRandom As New Random
    Dim stpw As New Stopwatch

    Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
        Display = False
        Me.Invalidate()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        tmr = New Windows.Forms.Timer
        Display = True
        Me.KeyPreview = True
        tmr.Interval = 10
        tmr.Start()
    End Sub

    Private Sub Timer_Tick(ByVal sender As Object, _
                           ByVal e As EventArgs) Handles tmr.Tick

        'Get a random time between 7 and 20 seconds for the timer
        tmr.Interval = MyRandom.Next(7, 21) * 1000

        ' Get a random number between A(65) and Z(90).
        NewChar = Chr(MyRandom.Next(65, 91))

        ' Make sure screen gets repainted
        Me.Invalidate()

        ' Stop the timer so that it doesn't fetch the next character automatically
        tmr.Stop()
        stpw.Reset()
        stpw.Start()
    End Sub

    ' Stopping and restarting timer
    Private Sub Form1_KeyPress(ByVal sender As Object, _
                               ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
        If (Char.ToUpper(e.KeyChar) = NewChar) Then
            stpw.Stop()
            txtRecord.Text = stpw.Elapsed.TotalSeconds.ToString
            NewChar = ControlChars.NullChar
            tmr.Start()
        End If
    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint

        If Display Then Dim textSize As SizeF = e.Graphics.MeasureString(NewChar, fnt)
        If NewChar = ControlChars.NullChar Then Exit Sub
        e.Graphics.DrawString(NewChar, fnt, Brushes.Red, x:=50, y:=50)

    End Sub
End Class

**rory-uk** · Feb 9th, 2010, 09:16 AM

Seems to work

What would be the best way to catch subsequent attempts as currently the result gets overwritten?

**dbasnett** · Feb 9th, 2010, 09:45 AM

add the stopwatch time to a listbox, or a List of timespan, or a richtextbox, etc.

**rory-uk** · Feb 10th, 2010, 09:26 AM

I can't get it to work with a list box

Using a rich text box just ends up with the same problem

**dbasnett** · Feb 10th, 2010, 11:03 AM

Originally Posted by rory-uk

I can't get it to work with a list box

Using a rich text box just ends up with the same problem

Try this

Code:

Public Class Form1

    Private Display As Boolean
    Private WithEvents tmr As Windows.Forms.Timer
    Private NewChar As Char
    Private fnt As New Font(Me.Font.FontFamily, 72, FontStyle.Bold, GraphicsUnit.Point)
    Dim MyRandom As New Random
    Dim stpw As New Stopwatch

    Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
        Display = False
        Me.Invalidate()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        tmr = New Windows.Forms.Timer
        Display = True
        Me.KeyPreview = True
        tmr.Interval = 10
        tmr.Start()
    End Sub

    Private Sub Timer_Tick(ByVal sender As Object, _
                           ByVal e As EventArgs) Handles tmr.Tick

        'Get a random time between 7 and 20 seconds for the next timer interval
        tmr.Interval = MyRandom.Next(1, 5) * 1000

        ' Get a random number between A(65) and Z(90).
        NewChar = Chr(MyRandom.Next(65, 91))

        ' Make sure screen gets repainted
        Me.Invalidate()

        ' Stop the timer so that it doesn't fetch the next character automatically
        tmr.Stop()
        stpw.Reset()
        stpw.Start()
    End Sub

    ' Stopping and restarting timer
    Private Sub Form1_KeyPress(ByVal sender As Object, _
                               ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
        If (Char.ToUpper(e.KeyChar) = NewChar) Then
            stpw.Stop()
            e.Handled = True
            RichTextBox1.AppendText(stpw.Elapsed.TotalSeconds.ToString("N3") & Environment.NewLine)
            NewChar = ControlChars.NullChar
            tmr.Start()
        End If
    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint

        If Display Then Dim textSize As SizeF = e.Graphics.MeasureString(NewChar, fnt)
        If NewChar = ControlChars.NullChar Then Exit Sub
        e.Graphics.DrawString(NewChar, fnt, Brushes.Red, x:=50, y:=50)

    End Sub
End Class

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