I have been trying to create a timer program with VB 2010 to the accuraccy of 0.05seconds (If possible, 0.01s)I insert a timer into the form (Timer1, Interval - 50).[code]But when I run the timer for 1min, the recorded time was 48.05 sec.How can I make my timer more accurate? Is there anything i have done wrongly with the code?
View 2 RepliesI need an accurate timer to interface a Windows application to a piece of lab equipment.I used System.Timers.Timer() to create a timer that ticks every 10 msec, but this clock runs slow. For example 1000 ticks with an interval of 10 msec should take 10 wall-clock seconds, but it actually takes more like 20 wall-clock sec (on my PC). I am guessing this is because System.Timers.Timer() is an interval timer that is reset every time it elapses. Since it will always take some time between when the timer elapses and when it is reset (to another 10msec) the clock will run slow. This probably fine if the interval is large (seconds or minutes) but unacceptable for very short intervals.Is there a function on Windows that will trigger a procedure every time the system clock crosses a 10 msec (or whatever) boundary?
UPDATE: System.Timers.Timer() is extremely inaccurate for small intervals.I wrote a simple program that counted 10 seconds several ways:
Interval=1, Count=10000, Run time = 160 sec, msec per interval=16
Interval=10, Count=1000, Run time = 16 sec, msec per interval=15
Interval=100, Count=100, Run time = 11 sec, msec per interval=110
Interval=1000, Count=10, Run time = 10 sec, msec per interval=1000
It seems like System.Timers.Timer() cannot tick faster that about 15 msec, regardless of the interval setting.Note that none of these tests seemed to use any measurable CPU time, so the limit is not the CPU, just a .net limitation (bug?)For now I think I can live with an inaccurate timer that triggers a routine every 15 msec or so and the routine gets an accurate system time. Kinda strange, but...I also found a shareware product ZylTimer.NET that claims to be a much more accurate .net timer (resolution of 1-2 msec). This may be what I need. If there is one product there are likely others.
I'm creating a program (SURPRISE!), one of the features it has is a tutorial helping with learning a language which has a lot to do with the program's topic. So, I want the program to be capable of getting what the user inputs using his microphone (as a respond to a question the program asks), then analyze it and compare it to a prerecorded answer, then tell him how well he did. How to do that?
If this can't be done using VB.Net, which wouldn't be much of a surprise, then what programming language or whatever do you recommend for me to create an external .exe file which takes in the input, analyzes it, and returns the result to my program? (Isn't this the longest sentence in the English language!)Yeah, and, how can I control how accurate the program is while comparing them?
I have question to ask.
I have a dll file written for reading&writing data on USB.To use dll in VB.Net, one needs to integrate a .vb file which interface to that dll file to use its functions, properties etc..
What I need is to use this dll in a C# project. is this possible?[code]...
I just want to know whether I can use "Reflector" to disassemble a Program written in DOS and go through all the Codes of that program to learn how that program was made? If the "Reflector" is not the one for DOS Program, could you recommend a Free Disassemler for DOS Program?
View 5 RepliesI have a program written in VB 2005, the computer used to write the code was running in Windows XP and 32 bit Pentium D. Now, my boss want to buy a new computer to run the program, and he wants the one that comes with Windows 7, 64 bit. Can my program run in the new computer without any problem? Or, is there anything that I need to change for it to run there?
View 12 RepliesIs there some Firefox extension that was written in VB.NET / VB6?
Would be nice to have a template for changes.
I have to intercept the Firefox reloading of data (XML data refreshed regularly by some javascript routines).Pretty much as the extension "tamper" does it (url...)
I have never used Visual Basic before.
I have some source code for a project to look at. How can I tell whether the code has been written in VB or VB.Net?
Is there an easy way to convert a program written in VB 4 to VB 2009 Express? VB 2008 wil not open a .MAK project.
View 7 Repliesi have written a small program to set wallpaper on the desktop when i change the wallpaper then if I refresh the desktop then problem is that,wall paper is disappeared and a blue screen comes.secondly i want few changes i want to set wallpaper as Tile,Center and stretch i want to use radio buttons on the form for this purpose so how can i make these changes.
View 1 RepliesI have the below C# Lambda function and I need to convert it to a VB.Net code. I tried many times but I couldn't convert it the right way. [code]...
View 10 RepliesVS 2008 VB/I've implemented an interface to a .com program written in c++. I'm trying to access a data structure array(uNewValues) of type PLCCOMMLib.ANALOG_CONTIN. uNewValues should be a datastructure array of several elements (iSigIDCount). My problem is I only get the first array element of the datastructure.I've tried several methods and looked into marshalling but don't understand how to implement marshalling if that is the correct option.
Code below:
Public Sub AnalogContinUpdate(ByVal iSigIDCount
As Integer,
ByRef puTimeDateStampGMT As PLCCOMMLib._FILETIME,
ByRef uNewValues As PLCCOMMLib.ANALOG_CONTIN)
[code]....
I have a small program on the menu written in VB6 retrieve data from Acess run very fast and now want to switch to VBNet2008. VBNet2008 conversion is still normal, but when running the menu does not appear that waiting in line, then click on the menu bar of this menu appears, but not the font is in Unicode data is available. Expect you to help debug programs that run on VBNet2008 still running good access Menu fast as running on VB6. Also supported is Unicode font on VBNet2008 does not function for unicode font. Attach program with VB6 and VB2008.
[Code]...
'i have written the following code:
Private
Sub Combo_Mth_KeyPress(ByVal
sender As
Object,
[code]....
'even thogh it seems to clear the text and select default text yet user written 'keyword appears in the text area of combobox?
After upgrading code to VS2010, the error "MSB3134: The permission set requested by the application exceeded the permissions allowed by the Internet or Intranet zones. Select Full Trust or to continue using partial trust, define your custom permission set in the Security Page of the Project Designer. Bentley Software Loader". The same code ran fine in VS 2008
View 3 RepliesI am parsing a web page with the HTML agility pack in vb.net and it works great most of the time, but I have come across a site I need help with.
When I go to grab the web page with my http object (I am using chilkat http and it does not have a javascript engine) I get back the page which is poorly written with document.writes for basically the entire page.
I do not want to use the browser control to first render the page.
Do you know of anything that will allow me to parse this page easily with xpath... does xpath work with javascript? Is there a way for me to remove the javascript with the agility pack?
i need the codes which written in the key press events to enable me to connect barecode to my program
View 6 RepliesI know pretty much how to save information into a text file from runtime VB2005. However, I wish to be able to write the information into any kind of form of file that cannot be simply opened and read by anyone (such as text file can be). Is there anyway that VB2005 can do this?
View 3 RepliesI have VB 2008 Express installed in my PC. I downloaded a program source code written in VB6 but could not open the files. What do I need to do to get this codes displayed.
View 4 Replies why this code the number i add not expected what i want?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim com As New OleDbCommand
Dim d As Integer
Dim qty1 As Integer
[code]....
I want to build a metronome,which sounds a beep in a specified time interval.The beep has to sound exactly the right time, after all, is a metronome.I need a timer that runs events(tick event)accurately.The timer control is not for this.
[Code]...
I set the value in VBT as 1.205, but if i print that value in Immediate window it get changed to 1.20492553710938. I need to display the value, whatever i have set.
what is the problem here and the solution to get the value whatever i have set?
Every sample code I've ever found for drawing rounded rectangles using GDI+ goes something like this (lifted and slightly modified from BobPowell.net):
Private Sub Panel1_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles Panel1.Paint
e.Graphics.Clear(SystemColors.Window)
e.Graphics.SmoothingMode = SmoothingMode.None
[code]....
This produces a rounded rectangle where only the top left corner is accurate.AntiAliasing has to be turned off because it is going through a remote desktop connection, and I can't depend on it being available. Besides, I am looking for a crisp rounded rectangle.I've tried resizing the other corners and changing the pen alignments, but nothing seems to produce a simple, accurate rounded rectangle.Is there a way to draw a better rounded rectangle than this in good old winforms?
I am currently using Decimal, thus far I have not checked thoroughly if it will have any inaccuracies so I wish to know from your experiences what is the best variable type for calculations, it would mainly be for areas.
View 10 RepliesWhats with this??the result of:CDbl(csng(35.8))is:35.799999237060547
View 2 Replieslook at this class and say why it's just returning just the first row in the second query, the issue is that the Salary is showing the right value when debugging, but when deployed to IIS it's just returning the 1st row
Imports System
Imports System.Collections
Imports System.ComponentModel
[Code].....
I'm using the code below to send large strings (500kB) to a server. I'd like to show the upload speed and in order to do that, I need to calculate the amount uploaded every second.
In a Timer that fires every second I get the BytesUploaded, divide it by 1024 in order to get KiloBytes (kB/s) and show it to the user. Then I set BytesUploaded to 0 and one second later do the same process.
The uploading is done asynchronously and the size of the data is added to BytesUploaded at once. This means that BytesUploaded is not being updated in a constant flow and has a totally different value almost every second.
0
512000
0
0
[Code].....
I am a sys admin for a company and our programmer left several months ago. a program they wrote is now failing and i am struggling to work out why. the program basically pulls data from a csv file into a readable form, written in visual basic. the application works on a couple of machines but not on a couple of others. i have matched up .Net framework versions, MS Primary Interop Assembly versions, still no joy. As the app works on some pc's i am wondering what other differences could cause this?
The error output is:
see the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box.
Exception Text
CODE:
JIT Debugging
To enable just-in-time (JIT) debugging, the .config file for this application or computer (machine.config) must have the jitDebugging value set in the system.windows.forms section. The application must also be compiled with debugging enabled.
For example:
CODE:
When JIT debugging is enabled, any unhandled exception will be sent to the JIT debugger registered on the computer rather than be handled by this dialog box.
when i type the number in textbox3, why the number update to database not accurate ?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim com As New OleDbCommand
Dim qty As Integer
Dim d As Integer = 0
[code]....
I am currently creating a program to send keystokes to a program at certain intervals. I need the thread to delay between keystrokes, and i need to be able to have the user input the amount of delay from the GUI via textbox. I have it running perfect with Thread.Sleep(), but it just isn't consistent enough. How can I code it to be accurate to roughly 5ms up or down? thanks, and here is the code. This is in VB 2010 by the way.
View 2 Replies