VBScript: Timer Stops Running Excel Another Workbook
When working with VBA scripts in Excel, it's common to encounter issues where the timer stops running when switching to another Excel workbook. This article will provide a detailed explanation of the problem and offer a solution to keep the timer running even when switching to another workbook.
Understanding the Problem
When using VBA to create a countdown timer in Excel, the timer is usually implemented using the Application.OnTime method. This method allows you to schedule a procedure to be called at a specified time. However, when switching to another Excel workbook, the timer may stop running due to the focus being shifted away from the original workbook.
Solution: Keeping the Timer Running
To keep the timer running even when switching to another Excel workbook, you can use the following VBA script:
Private Declare Function SetTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long) As Long
Private Declare Function KillTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long) As Long
Private Const TIMER_ID As Long = 1
Sub StartTimer()
SetTimer Application.hWndAccessApp, TIMER_ID, 1000, AddressOf TimerProc
End Sub
Sub StopTimer()
KillTimer Application.hWndAccessApp, TIMER_ID
End Sub
Sub TimerProc(ByVal hwnd As Long, ByVal uMsg As Long, ByVal idevent As Long, ByVal sauElapse As Long)
Static seconds As Integer
seconds = seconds + 1
Debug.Print seconds
End Sub
This script uses the Windows API to create a timer that is not affected by switching to another Excel workbook. The SetTimer function is used to start the timer, and the KillTimer function is used to stop the timer. The TimerProc function is called at regular intervals (in this case, every 1000 milliseconds or 1 second) to perform the desired action (in this case, incrementing the seconds variable and printing it to the Immediate window).
By using the Windows API to create a timer in VBA, you can ensure that the timer continues to run even when switching to another Excel workbook. This technique can be useful in a variety of applications, from countdown timers to automated tasks that need to run at regular intervals.