Loop While Application Is Running?
Nov 19, 2009
I am writing a program that is connected to an rs232 port and I need it to constantly be monitoring the incoming data. I think there are a few ways of doing this like checking the buffer but I need this to be running while I am connected to the port. I have a play button and a pause button for the port. When the play button is pressed, the port is open and the button is no longer enabled until the pause button is pressed. I need to have a while loop running the entire time the play button is no enabled, or pressed. I am having a hard time knowing where to implement it in the code.
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Apr 24, 2010
I had done one application using api which send the message to given number. The working of software is very fine without any error working on windows XP SP2. I heard that vista already contain the .net frame work so didnt installed .net frame work in machine. I checked in vista it shows .net frame work is in machine. But when same code i tried to run on Vista it gives the error. Error is as follows
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at SmsSendingApplication.frmSingleMessage.InternetOpenUrl(Int64 hInternetSession, String& lpszUrl, String& lpszHeaders, Int64 dwHeadersLength, Int64 dwFlags, Int64
[Code].....
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Jun 22, 2010
If I'm running a Do... Until or a For... Next loop in a button click event, is there a way I can allow the user to click the same button while the loop is running and escape the loop?
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Sep 6, 2011
Is it possible to make a For loop which count down. Like:
For i as Interger = 5 to 0
'Do stuff
Next
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Apr 2, 2010
I am iterating through the table rows . if the row row is null I just want to remove the row.[code]....
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Sep 30, 2011
I'm developing a interface in VB.net which will control two stepper motors. Counting on your tips I managed to control them manually I mean, there're 4 buttons used to move the motors clockwise and anti-clockwise. The point is, the main part of our project is control the motors automatically. Our idea is based on two editable fields, X and Y, where the user would insert the displacement value he'd like the motor to move. After filling up both fields, the "GO" buttons would be pressed. So the loop would run depending on the displacement values in X and Y.
Attached you can find the main screen:
Below you can find the main code.
Public Class Form3
Dim velocidade As Double = 0.004
Dim X As Integer = 0
[Code]....
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Apr 20, 2011
1. load gridview from an uploaded excel file (this would probably be about 300 records or so)
2. compare manufacturer, model and serial No to my MS SQL database (about 20K records) to see if there is a match.[code]is there a better way to find a match between the two?
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Oct 4, 2011
Basically what I have are two loops, one inside the other, that will run until the given condition is met. Exactly what I want. My problem is that I want to be able to use the controls, like buttons, while a loop is going on.
I originally did not think of this until I had built this part of my program, what I want to know is if there is a way to use controls while a loop is going on or if their is an alternative.
1)I know timers can be used to meet these goals, but they did not work out as I had hoped and using two timers (1 to represent each loop) I do not believe is efficient.
2)I have considered using recursion, but have found this may not be very efficient either and am not quite sure if this will do what I want.
These loops run as long as the number the user inputted. So it could theoretically run for 100,000+ times. I am not looking for speed, but it would be good if there were a faster method that allowed me to use controls while it loops.
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Jun 4, 2011
what account for this error message in ls beta 2?'' The last change wasn't successfully persisted.Please shot down the running application.
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Mar 8, 2012
Windows Forms, VB application... Forgive me in advance for this very elementary question but I am overlooking something really simple here. I would like to have a label show the current value of a variable as the for each loop runs.. I created a very simple Button Click event to figure out where its failing. As it is right now the value does not display until after the for each loop finishes running, which it should actually display the counter value each time it runs through... I know this is possible and really simple because I did it years back but for the life of me cant figure out why I am missing the bar as it should constantly update the label to reflect that?Test Sub is as follows:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim counter As Integer = 0
For x As Integer = 1 To 200000
[code]....
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Mar 15, 2012
I've been having a bit of a problem using the while function.
Here is my code (Simplified):
Dim RandomNumber3 As Random
Dim RandomOutput3 As Integer
[CODE]..............
When running the debug, the program crashes, and when I step into the program, I find that this While statement becomes an infinite loop. This is a program that uses random number generators to assign a value to something, and this while statement is necessary so that there is never two of the same values showing (RandomOutput, RandomOutput2 & RandomOutput) Have to be different to one another.
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Aug 12, 2010
I am currently teaching myself the caveman code of Visual Basic (VB.net). Apparently I fail at If-statements or something, because I cannot get this to work...
[Code]...
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Feb 8, 2012
While a "for loop" is running in VB.net, C# or Python which method can be used to append each result to a variable?
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Oct 17, 2009
When it comes to threading. I've managed to adapt one of JMcIllhinney's backgroundworker codebank examples to somewhat suit my needs, but not completely. I have a main form, and a second form that appears while I'm running through a for loop. It informs the user what is currently happening. I set up a backgroundworker that allowed me to continue to use the main form during the for loop, but the other "status" form was completely frozen, and any labels or graphics were shown as white boxes. I am struggling to figure out how to be able to move/interact with both forms while the loop is running.
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May 17, 2010
I'd like to make a simple program where my form consists of a textbox and a button. Here's the ide in a nutshell:in form1_load I invoke the sub:
private Sub LoopingLesson()
dim i as integer=1
while true
[code]....
what I want is when i hits certain value, like let's just say i is divisible by 365, then the 'while' looping will stop, and a message box saying "target reached" appear. then after I click button1, the looping will resume until it reaches the next number divisible by 365, and so on.
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Jul 12, 2011
Which is the best way to store application and user settings of an application running with multiple instances?My problem is that using the vb's "Application Settings" one instance would overwrite the other one.I want to identify each instance with a number passed via command line argument. I could use this number to identify the appropriate settings of the running instance, but I see in a local INI o XML file a better way to handle that.
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Apr 9, 2011
Let's say 10 desktop shortcuts, all with different names/icons, point to and can start the same exe application from the same directory. Is there any means for the application to know the distinct name of the shortcut that was doubled_clicked. Also is there any means for a running application to know if it was started by command line, by a double_click on the exe, by a double_click on a shortcut that points to it, or by another process' call?
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Oct 21, 2010
I am trying to use Setup project. Want my setup to create a desktop shortcut with my application.I donot understand how to do it. Clicked on User's desktop, I created Shortcut to User's desktop, changed the properties Target and Working Folder as 'Application Folder'But it does not connect with MyApplication.exe When I ran the setup and tested Desktop short cut, it took me to the folder where application was installed, instead of running the application.How to make the application run using this shortcut?
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Aug 25, 2011
I need a small app that randomly shuffles a set of preloaded numbers. The shuffling will be visible on the screen and goes on continuously (looping) until a key is pressed and as soon as that happens it will show the winning number.Am using visual basics 2008 to develop the application but my problem is when i start the app and hit a key it will loop through my numbers on the text file and it will also display the event but if i hit a key to stop it will not stop..I was workin on the app but my problem is how to stop the loop and resume on the with a keypress. below is the app codes.
Dim Running As Boolean = False
Sub ReadAccounts()
Dim arr As New ArrayList
arr.Add("1366-665885-666-22650")[code]....
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Dec 25, 2011
I need to run an external JAR file (which is minecraft) within the window (form) of a VB.NET application, so like having the program in the center and additional text I like around it.
Is this possible, and if so, how?
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Mar 15, 2012
Is it possible to reload a form of the running application from one computer when I executed a function from my other computer with the same application? co'z I want to see the changes of data on my datagrid view?
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Mar 2, 2011
I have 2 applications, "Application A" and "Application B" In application B, there is a loop that do some work Now, from Application A, I want to control this loop, in application B, so the loop gets run once each time Application A say so Up to this point, There is no problem, I just created a Mutex that I pass from an application to the other.
The problem comes when Application A want to stop the game -If application A terminate its thread without closing the Mutex, Application B does take it and the loop goes on non stop. But what I want is to exit the loop.I can immagine 3 ways to terminate the loop, but none of them apears to be the good way to do
1) Closing the mutex in application A. This will create an exception in Application B, which I can catch to terminate the loop
2) Create a custom windows message for Application A to notify Application B that the mutex needs to be close so Application B can exit the loop and close the mutex. ( However, I am using a mutex to avoid to use this windows message pathern, I do not want the UI thread to be involve in the mecanism )
3) Create another mutex that would be own by application A and that will be blocking another thread in Application B. This way, Application A by releasing this mutex can permit this other thread to set a boolean flag telling the thread in the loop to exit the loop.
To illustrate this, I made this short code. It implement the option 1) which is using the exception to exit the loop
Application A
Public Class Form1
Dim MutexA As Threading.Mutex
[code]....
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Oct 21, 2009
I am not sure if it proper forum for this question. anyone explain how to run a easy VB.net program in a website.I know there are other programming tools for this purpose but I'd like to use VB.net.
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May 11, 2009
I have an application that provides core services for a series of other applications.When another of these applications is started, I want to check that the service application is running and if not shutdown.What is the best method to check for the existence of the other app? I'm thinking that I should be using a global mutex in the services app and checking for it's existence in the other apps. Is this the correct way to proceed?
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Apr 12, 2011
how to get the name of control on the screen that is running in a different appliation. The getwindowname only gets the title bar and controls don't have title bars. I can get the text from each control , but I can seem to find a way to get the name of it.
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Mar 21, 2009
I am using Windows XP and Visual Studio 2008. Now, i am writing an application which under testing runs fine under XP but when i try to run it under Vista, when i click on the program i keep getting an error saying:System File Intergrator has stopped working.How do i get my application to run on Vista as well as XP?
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Nov 29, 2011
I'd like to block unwanted application from running in my system, mostly setup until given access by my application. I would have a white list of allowed application.
how do i imoplemnt this in vb.net
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Jan 21, 2009
I want to be able to test if an Excel application is already running on the computer. If it is, I want to use it to create and save a new file. Excel will remain open.If no Excel application is running, I will open Excel, create and save a new file, and then close Excel.
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May 16, 2010
I am trying to delete a running application is this possible. Here is what i meanIf you have a program running you know when you try to delete it, a message pops up " this program is being used Bla Bla Bla ..." want to delete that program even if its being used.
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Aug 4, 2009
Is it possible to disable F12 key when my application is running using framwork 2.0
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