?
Solved

1ms timer calling functions

Posted on 2016-08-09
3
Medium Priority
?
139 Views
Last Modified: 2016-08-13
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?

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

Open in new window

0
Comment
Question by:XK8ER
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 30

Expert Comment

by:anarki_jimbel
ID: 41749734
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
0
 
LVL 1

Author Comment

by:XK8ER
ID: 41749749
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.
0
 
LVL 30

Accepted Solution

by:
anarki_jimbel earned 2000 total points
ID: 41749800
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
0

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
Suggested Courses

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question