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Tip of the Day
Language: Visual Basic
Expertise: Beginner
Aug 6, 1997

Keeping Accurate Time In VB

I developed a CBT project which required the user to read large amounts of text. I wanted to prompt the user to take a break after a period of time. The problem with the VB timer is that it lasts just over a minute. I used the API function GetCurrentTime(), which records the milliseconds since Windows was started. Place a Timer control on the form that starts the application (make sure that this form remains loaded throughout the application). Place this code in the Declarations section of the form:
 Dim Start&, Elapsed&
Declare Function GetCurrentTime& Lib "User" () 
The Form_Load event of this form must also contain this code:
 Start = GetCurrentTime
This routine sets the Timer interval to about a minute.
 Sub Timer1_Timer ()

	Dim MsgText$

	Elapsed = GetCurrentTime()
	' if 10 minutes has elapsed since 
	' the program was started
	' or the last msgbox was displayed
	If Elapsed - Start >= 600000 Then ' 10 minutes
		MsgText = "Give your eyes a rest. _
			Take a 5 minute break."
		MsgBox MsgText, 16, "Take A Break"
		' however long the msgbox is on the screen
		' the timer is effectively set to 0 when the
		' user presses OK
		Elapsed = GetCurrentTime()
		Start = Elapsed
		Elapsed = 0
	End If
End Sub
David Mawson
 
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