ACC2000: How to Create a Stopwatch Form (233275)

SUMMARY

This article describes how to create and use a form that contains Start/Stop and Reset command buttons that use the Timer event of a form to display elapsed hours, minutes, and seconds in a text box control.

NOTE: This article explains a technique demonstrated in the sample file, FrmSmp00.mdb. For information about how to obtain this sample file, please see the following article in the Microsoft Knowledge Base:

233324 Microsoft Access 2000 Sample Forms Database Available in Download Center

Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements.

MORE INFORMATION

The following example demonstrates how to create and use a form to track elapsed time:

Open any database.

Create a blank form not based on any table or query and set the following properties for the form:

   ScrollBars: Neither
   RecordSelectors: No
   NavigationButtons: No
   OnTimer: [Event Procedure]
   TimerInterval: 0

Add a text box to the form and set the following properties for the text box:

   Name: ElapsedTime
   DefaultValue: "00:00:00:00"
   Enabled: No
   Locked: Yes

Add a command button to the form and set the following properties for the command button:
```
   Name: btnStartStop
   Caption: Start
   OnClick: [Event Procedure]
					
```
Add a second command button to the form and set the following properties for the second command button:
```
   Name: btnReset
   Caption: Reset
   OnClick: [Event Procedure]
					
```

Click Code on the View menu to open the editor. Type the following lines in the Declarations section:

Option Explicit
Dim TotalElapsedMilliSec As Long
Dim StartTickCount As Long
Private Declare Function GetTickCount Lib "kernel32" () As Long

Set the OnTimer property of the form to the following event procedure:

Private Sub Form_Timer ()

   Dim Hours As String
   Dim Minutes As String
   Dim Seconds As String
   Dim MilliSec As String
   Dim Msg As String
   Dim ElapsedMilliSec As Long

   ElapsedMilliSec = (GetTickCount() - StartTickCount) + _
      TotalElapsedMilliSec

   Hours = Format((ElapsedMilliSec \ 3600000), "00")
   Minutes = Format((ElapsedMilliSec \ 60000) Mod 60, "00")
   Seconds = Format((ElapsedMilliSec \ 1000) Mod 60, "00")
   MilliSec = Format((ElapsedMilliSec Mod 1000) \ 10, "00")

   Me!ElapsedTime = Hours & ":" & Minutes & ":" & Seconds & ":" _
      & MilliSec

End Sub

Set the OnClick property of the btnStartStop command button to the following event procedure:

Private Sub btnStartStop_Click()

   If Me.TimerInterval = 0 Then
      StartTickCount = GetTickCount()
      Me.TimerInterval = 15
      Me!btnStartStop.Caption = "Stop"
      Me!btnReset.Enabled = False
   Else
      TotalElapsedMilliSec = TotalElapsedMilliSec + _
         (GetTickCount() - StartTickCount)
      Me.TimerInterval = 0
      Me!btnStartStop.Caption = "Start"
      Me!btnReset.Enabled = True
   End If

End Sub

Set the OnClick property of the btnReset command button to the following event procedure:

Private Sub btnReset_Click()
   TotalElapsedMilliSec = 0
   Me!ElapsedTime = "00:00:00:00"
End Sub

Open the form in Form view to test the stop watch.