I need to have a microsecond-timer in my program. The default VB timer doesn't work for me because I need to count time accurately. Does anyone know a way to count time in for example 0.1 milliseconds?
View 9 RepliesI'm working on a client application (server is out of my control) that connects to a server and exchanges query/command datagrams. 'Milliseconds Count!' according to my project specification, meaning that the more we can shave off a send/receive process the better.
I understand that there are physical limitations like network bandwidth, internet latency, etc. Even so, I have a strong gut feeling that a lot of the latency I'm seeing is directly related to processing; it seems 'out of phase' from the latency of other network operations (albeit with significantly smaller datagrams). IE: A standard 32 byte Windows Ping returns in about 5ms consistently, our query/response datagram (468 bytes out, 1500 bytes back) returns in about 15ms consistently.
I'm also working with multiple threads to speed things up as much as possible at the client side, and it seems the more threads are involved the more latency is generated (I've seen up to 70ms of additional lag when using 3 threads as opposed to 2). In a recent Google I found something that I only glanced at, that said something about a limitation in Windows System Timing where some claim was made that any System.TimeSpan < 10ms was effectively going to be a 10ms Timespan because the Windows System Clock only 'Ticks' every 10ms. I wasn't paying attention at the time, but now I'm afraid it might be relevant and I can't find it again.
I have a value which is milliseconds, I did some experimenting, and with my very limited math skill I came up with this:
Dim val = _Memory.ReadValueFromAddress(hProcess, timer_addr, 4)
Dim seconds = val / 60 Mod 60
Dim minutes = val / 60 / 60
I don't even know what will happen when the hour counts down,
Q: How to computer the interval time from Starting block until its finish? For example, How to compute the time (in Millisecond or Microsecond) for execuation a serting block (Sortign or Searching Algorithm for example)? NOTE: Time must be in Millisecond or Microsecond, NOT in Second!
View 2 RepliesI'm looking for the equivalent to a Java System.currentTimeMilli(), in VB.NET.What is the method to call? I know about Datetime.Now, but not about the actual conversion to long milliseconds.More details about my specific need: I need to manage a login expiration. So most likely when I log in, I will set a "expiration_time_milli", equal to the current time + the timeout value. Then later, if I want to check if my login is valid, I will check is "expiration_time_milli" is still superior to current time.
View 4 RepliesI would like to emulate the "new Date().getTime();" function that Javascript has. This calculates how many milliseconds it has been from Midnight, January 1st, 1970 to the current time. How would I go about doing this?
View 7 Repliesjust trying to work out some functions, like time delays and such and autoclickers.What I have is two command buttons and one textbox, and what I want this program to do is make a mouseclick according to the time inserted into the textbox (in milliseconds). e.g say someone types in "500", after button 1("START") is clicked, the mouse will click every 500 milliseconds, and button 2 ("STOP") will halt execution. Also, would this continue execution in the background, if i have other programs open? I've been able to make a program that has a timer which ticks at the specified time, I just can't get it to make the mouse click, i've tried "cmdButton.PerformClick" but thats not working,
View 2 RepliesIn the below condition , i need to run the time in decreasing order untill the date becomes equal..
5:35:00 left
5:34:30 left
0:29:00 left
Like this ...
ElseIf countdate = 1 Then
Label1.text = "time count should be viewed"
End If
[code]....
In the below condition , i need to run the time in decreasing order untill the date becomes equal..
5:35:00 left
5:34:30 left
0:29:00 left
ElseIf countdate = 1 Then
label1.text = "timecount should be viewed"
End If
currentdate = Date.Now.ToString("MM/dd/yyyy")
Dim diffdbdate As DateTime = dr.Item("date")
Dim diffdate As Integer
diffdate = DateDiff("d", currentdate, diffdbdate)
Dim countdate As String = Replace(diffdate, "-", "")
If currentdate > diffdbdate Then
Label1.text = countdate & "days Before"
ElseIf countdate = 1 Then
i need to run the the time , in the decreasing order
End If
<div id="refHTML"></div>
I want to set timer to count down from 40 mins, then messageBox("Time is up"). How do I do this?
View 2 RepliesIm making an key counter and ive got the program to count all keys at the time, i just can't count mouse buttons, i would really like to have help with this, if any of you wanna help im online at my own IRC chat. [URL]..
View 2 RepliesI have already made an algorithm for the problem but it still got a trouble.Suppose that I have the recap of schedule (contains on gridview named GV):
TimeStart TimeEnd TotalOccuredOnThisTime
----------------------------------------------
08.00 08.50 1
08.00 09.40 43
08.00 10.50 2
What I want to get from the algorithm is, to count the time that occured on the same period, e.g. on the time of 08.00, it's occured 46 event (see the yellow colored row).This is my algorithm:
Dim ColumnLength As Integer = GV.Rows.Count
Dim TimeStart(ColumnLength - 1) As Integer
Dim TimeEnd(ColumnLength - 1) As Integer[code]......
I would like to count time range for hour in visual basic and my time is in 12hr format and the time1, time2 including date is from oracle database.
View 5 Repliesam really getting to know more about programming each day. really interesting.
i have a form with some labels.. i need each label to display a text after certain time of the time count. i have this piece i put together.. didnt work but i guess it need a little professional touch.
[Code]...
I need to find the best solution to count how long it takes to make a request to database like connect, do a select and receive the answer. And if that take more than 300 milliseconds I must cut the connection.
Public Function FindLastCt() As Decimal
FindLastCt= 0
Dim strrequete As String = "SELECT MAX(CM_Codigo) FROM CAJITAS WHERE CM_Date >= '" & Format(DateTime.Now, "dd/MM/yyyy") & " 00:00:00.000' AND CM_Date <=
'" & Format(DateTime.Now, "dd/MM/yyyy") & " 23:59:59.999'"
Using connection As DbConnection = factory.CreateConnection()
[Code] .....
I need to count a large amount numbers in short time.As a result the CPU jumps to 40-60% on 4-core PC.Which is extremely high.I have any idea that will lock up the thread for some time, but not actually slow or reduce the amount of files that are allowed to be counted per a giving time period.
Vb.net
Application.DoEvents()
Threading.Thread.Sleep(1000)
how to capture an on/off signal from a relay and count the seconds of elapsed time between the cycles on a com port? Also, which pins on the com port should be used for this?
View 12 RepliesThe following sub prints 5/3/2010 8:39:26 to the tracelog file as per code below. How do I add milliseconds to the output?[code]...
View 2 RepliesI have an ASP.NET, VB.NET Date, and I'm trying to get the number of milliseconds since January 1st, 1970. I tried looking for a method in MSDN, but I couldn't find anything.
View 2 RepliesI need to analyze a 100 x 100 image in less than a second I need to find out if the image contains any red pixels.I have an application that provides that functionality but it's not as fast as it needs to be.
View 7 Replieshow can i converting minutes into milliseconds
View 8 RepliesHow do I convert milliseconds into a timestamp (date/time) since Jan 1 of the year 1? (Jan 1 Year 1. Not Jan 1 Year 1970) This timestamp hex code from a file:e1 27 17 6f e6 69 c0 which is 63,374,851,375,000,000 in decimal (milliseconds).I can't find any converter that can convert numbers based on Jan 1 Year 1.
View 1 RepliesI am pulling a single field from a SQL Server 2008 table and when performing the SELECT in Management Studio, the result shows as:
2011-08-03 17:46:36.997
Now, in my application I'm storing that returned result as a string and using it to later perform an INSERT using it. I notice that after INSERTing into the database, I can see it is being stored as:
2011-08-03 17:46:36.000
Appears to be stripping off the milliseconds and replacing it with 000. In my case, milliseconds are important (sequencing thing)
Is there a way to add milliseconds in dateadd? It is not in the DateInterval enum. I created a class so my program knows what the real time is, based off the sql server. This way, we don't have to worry about people's computer clock being off, or different time zones, etc. When the program starts, it grabs the current time on the SQL server, and starts a Stopwatch. Then each time I need the time, I find the elapsed time on the stopwatch and add to the SQL time. The problem is that I use these times sometimes to do timestamps as a unique ID for certain records, and sometimes multiple records get created in the same procedure, so it is being called more than once per second, so the same ID is returned. I need the time to go down to milliseconds, so it is more precise. Therefore, I can't just multiply the seconds by 1000.
Here's my class
vb.net
Public Class RealTime
'Added 11/03/2010 v0.4.4 To determine the real time, not the time on the local machine.
'The time will be stored in GMT +/-0 World Time
Private stopW As New System.Diagnostics.Stopwatch
Private StartTime As DateTime
[Code] .....
When the Point of Sale program we use makes a change to a row in the SQL database, it automatically updates the ModificationDateTime for that row, and the precision is in milliseconds. I have another column called "LastSyncDateTime, and when theModificationDateTime is greater than the LastSyncDateTime, it downloads the row, finds the column that got changed, does its thing in my program, then updates the LastSyncDateTime with the same value as the ModificationDateTime so it doesn't repeat itself on the same row.The problem is that when it goes back to update the LastSyncDateTime, it loses the milliseconds precision, so the SQL Stored procedure to download new changes doesn't work ("Give me all the rows where ModificationDateTime <> LastSyncDateTime").
View 2 RepliesIs there a way to get the time length of an mp3 in VB.net? I have TagLib, but it doesn't seem to have any functionality for it.
View 2 RepliesI'm in need of a timer that runs a process every 31.25 milliseconds. Thus, after 768 "ticks" have gone exactly 24 seconds.The control "Timer" that exists in Visual Studio does not accept decimal values.So I had to round the value of the range to 31 or 32. But this raises a problem since the end of the 768 ticks there is a difference of half a second or more. And I need to run the 768 ticks in exactly 24 seconds.I've been researching, and I read some things about the "High-Resolution Timer. " But I did not understand exactly how to use it, and how to set your interval to 31.25 mils, and do that every period of this interval to run the code.
View 1 RepliesI have a created a high performance diagnostic logging mechanism that uses a time stamp. It's a print statement gadget that automatically prepends date/time using Now() for the basis of that time stamp. I use the full date and time all the way down to the milliseconds value of the Now() object.
Are there any resolution issues when using the milliseconds component.
Can i show seconds and minutes to or just Milliseconds
=vb.net
Dim timer = Stopwatch.StartNew
=vb.net
timer.ElapsedMilliseconds.ToString & " Milliseconds Elapsed During Scanning
I am trying to create an application that records screenshots every 50 milliseconds... And It works below:
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
Dim b As Bitmap = New Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height)
[Code]....
But after 30 seconds I see an ArgumentException on the second line...
Does anyone have a solution or an alternate method of capturing the screen like this?