How do I code a timer to count down to 2 minutes after inactivity?

How do I code a timer to count down to 2 minutes after inactivity?

P.S. keeping resource usage low is the goal here?

Try this:

Code:

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Sub Pause(Interval As Integer)
    Start = Timer
    Do While Timer < Start + Interval
        DoEvents
    Loop
End Sub

Private Sub Command1_Click()

    Label1.Caption = "120"
    Do Until Label1.Caption = "0"
        Label1.Caption = Label1.Caption - 1
        DoEvents
        Pause 1
    Loop
   
End Sub

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You can get Windows to run a timer (or as many timers as you have memory for) for you. I don't know how to do it in VB, because I've only ever seen it in C, but I expect there's a way of getting it in VB.

It's a callback function, so I guess you could use the AddressOf operator to send a pointer to a function that will handle the timer's event. Here's the prototype in C:

Code:

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UINT SetTimer(HWND hWnd,        // handle to parent window
        UINT nIDevent,                        // timer ID
        UINT nElapse,                        // timer delay in milliseconds
        TIMERPROC lpTimerFunc);                // timer callback

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In case you don't know what all that means, basically if it was written in VB it would be:

Code:

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Function SetTimer(hWnd As HWnd, _        ' handle to parent window
        nIDevent As Integer,        _                ' timer ID
        nElapse As Integer,        _                ' timer delay in milliseconds
        lpTimerFunc As TIMERPROC _                ' timer callback
        ) As Integer

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Except the integers are actually meant to be unsigned.

lpTimerProc might look a bit odd; basically you pass the address of your function that you want to be triggered when your timer event fires. nIDevent is an ID number you assign this timer so that you can destroy it afterwards. nElapse is, as you might have guessed, the length of time in milliseconds between each firing of your timer. hWnd is the handle of the parent window (you can use your main form) so you can send something like Form1.hWnd in that.

You need to destroy the timer when you've finished with it, using the KillTimer function:

Code:

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BOOL KillTimer(HWND hWnd,        // handle of window
                UINT uIDevent);        // timer ID

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Hey this might be of absolutely no use whatsoever to you, but at least you know that Windows provides timers if you need them.

[Edited by HarryW on 11-17-2000 at 12:05 AM]

Well Harry, just search for Settimer and you'll find, i know, i'm just too tired to search for it hehe, well pu this in a settimer proc or a timer event:

Code:

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    If CheckActivity > 120000 Then MsgBox "Inactivity for 120 seconds"

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And then you notice CheckActivity isn't a valid vb function so you have to use mine instead:

Code:

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Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer
Private Declare Function GetTickCount Lib "kernel32" () As Long
Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long

Private counter As Long
Private Type POINTAPI
        x As Long
        y As Long
End Type

Function CheckActivity() As Long
    Static oldk As Long, oldm As POINTAPI, newm As POINTAPI, counter
    Dim newk&, n&
    For n = 0 To 255
        newk = newk + GetAsyncKeyState(n)
    Next n
    GetCursorPos newm
    If newk <> oldk Or newm.x <> oldm.x Or newm.y <> oldm.y Or counter = 0 Then counter = GetTickCount
    CheckActivity = GetTickCount - counter
    oldm = newm: oldk = newk
End Function

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Thanks guys,

You all had great suggestions. I ended up using Kedaman's coding, It worked like a real charm.

Thanks guys, I really do appreciate it.