[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

1ms timer calling functions

Posted on 2016-08-09
3
Medium Priority
?
179 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
  • 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 Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
High user turnover can cause old/redundant user data to consume valuable space. UserResourceCleanup was developed to address this by automatically deleting user folders when the user account is deleted.
How can you see what you are working on when you want to see it while you to save a copy? Add a "Save As" icon to the Quick Access Toolbar, or QAT. That way, when you save a copy of a query, form, report, or other object you are modifying, you…
Is your organization moving toward a cloud and mobile-first environment? In this transition, your IT department will encounter many challenges, such as navigating how to: Deploy new applications and services to a growing team Accommodate employee…

590 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