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Solved
1ms timer calling functions
Posted on 2016-08-09
Hi,
For testing purposes I have this timer that calls a function every 1ms and adds +1 to a counter. This code works perfectly fine as its calling windows native code but is there anything in the .NET framework even close to 1ms or shall I stick to using native calls?
For testing purposes I have this timer that calls a function every 1ms and adds +1 to a counter. This code works perfectly fine as its calling windows native code but is there anything in the .NET framework even close to 1ms or shall I stick to using native calls?
Public Class Form1
Dim mHandler As TimerEventHandler
Dim iCount As Long = 0
Dim mTimerId As Integer
<DllImport("winmm.dll")>
Private Shared Function timeSetEvent(delay As Integer, resolution As Integer, handler As TimerEventHandler, user As IntPtr, eventType As Integer) As Integer
End Function
<DllImport("winmm.dll")>
Private Shared Function timeBeginPeriod(millisecond As Integer) As Integer
End Function
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
timeBeginPeriod(1)
mHandler = New TimerEventHandler(AddressOf TimerCallback)
mTimerId = timeSetEvent(1, 0, mHandler, IntPtr.Zero, 1)
End Sub
Private Delegate Sub TimerEventHandler(id As Integer, msg As Integer, user As IntPtr, dw1 As Integer, dw2 As Integer)
Private Sub TimerCallback(id As Integer, msg As Integer, user As IntPtr, dw1 As Integer, dw2 As Integer)
iCount += 1
End Sub
End Class
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3 Comments
Active 1 day ago
It's not quite clear what you want or what's required.
You may use stopwatch class to measure time elapsed: https://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch(v=vs.110).aspx
You may measure in milliseconds or in ticks. 1 tick - 100 ns.
Also you may use DateTime.Ticks property to measure times:
https://msdn.microsoft.com/en-us/library/system.datetime.ticks(v=vs.110).aspx
You may use stopwatch class to measure time elapsed: https://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch(v=vs.110).aspx
You may measure in milliseconds or in ticks. 1 tick - 100 ns.
Also you may use DateTime.Ticks property to measure times:
https://msdn.microsoft.com/en-us/library/system.datetime.ticks(v=vs.110).aspx
using DateTime is not a good suggestion as it has a resolution of about 15ms and also stopwatch is not good unless you use high resolution stopwatch.
the questions here is more of a concern than anything else, so i'm just worried if there are any casualties by using this code in a production environment or if it is a safe call.
the questions here is more of a concern than anything else, so i'm just worried if there are any casualties by using this code in a production environment or if it is a safe call.
Active 1 day ago
DateTime - correct : )
I can't really see any problems with using Windows API.
On another hand, my understanding is that if a system supports high performance counters the .net stopwatch should be high resolution stopwatch. Have a look: https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx
I can't really see any problems with using Windows API.
On another hand, my understanding is that if a system supports high performance counters the .net stopwatch should be high resolution stopwatch. Have a look: https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx
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