Perform "DoEvents" On A Conditional Basis?
May 31, 2010
Several months ago, I asked someone here if it was possible to perform "DoEvents" on a conditional basis. This was for a VB6 application and it worked okay. It will not work in VB2010 and I was wondering if someone could tell my why?Error Message from VB 2010:
A call to PInvoke function 'MyApp.frmMain::GetQueueStatus' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
[Code]...
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Mar 19, 2012
Is there a way to set a variable in VB.NET in an IF statement. I would like to do the following:
[Code]...
Is there some way I can get the last "ElseIf" to work? I know I can re-write it to get it to work but is there some syntax that will make it work the way it is?
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Jan 26, 2012
I have a query table like below
[code]...
I have a "bank ref id" text box and value is " yy/98"One the basis of selected row, bank ref should update on second table.
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Feb 11, 2010
I have developed a software, now i want to float in market on license basis, what i want to do is data, there should be some code which generate sever hardware key and then prompt for license key.
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Jan 4, 2011
I have been asked to create a Framework to be the basis of all our drafting toolsets. The approach I think is best is to outline all of the Classes that will be required (Text, dimensions etc), identify routines and properties required for the Classes and document in a spreadsheet.
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Sep 30, 2009
I want to create a page in asp.net website . it has to have one text box . the user enter the productcode in the textbox and click on search . when the user click search i want to display all the information about that product from product table.
[Code]...
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Sep 8, 2009
i have datagridview with rows in it and one of the col show type of product. there are row with same type. on click of button i want to select all the row where productype = 1 (for example)
do i have to go thru each row in grid and check the condition for product type and then select it or there is another quick method.
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Mar 12, 2012
i have my code as below in which i need to check the column(3) and column(4) for a condition and based on it i need to change color of the text and add some text to the value. Kindly guide for the same...
Dim sDs As DataSet
Dim sTable As DataTable
Dim sBuilder As SqlCommandBuilder
[Code].....
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Oct 2, 2009
I am developing a program in which I add the payments for my bills on a monthly basis. I have the design layout and the logic thinking, but having a little difficulty getting the database codes in place. I have 2 comboboxes that act as drop down boxes (1 lists all 12 months and the other lists the years, only 2009 for now for testing).
My access database has 3 columns (name, dates, amount). The names are pre-populated and the only columns displayed in the datagridview are name and amount.
When I choose a month and year, the datagridview should populate with the amounts entered from that month. I am having trouble debugging which lines of code are not working because there are no errors showing, just seems that it stops running at some point.
Dim Connection As OleDb.OleDbConnection = New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Documents and Settings\Administrator\My Documents\BillTracker.accdb;Jet OLEDB:Database Password=password")
[CODE]...
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Aug 25, 2010
I am trying to come up with a way to store 3 pieces of information for each employee in the company on a daily basis. So for instance:
Day 1: Joe, 8, 80
Day 2: Sam, 10, 90
Day 3: Bill, 5, 40
Day 4: Bob, 8, 40
Day 5: Sue, 2, 50
I am very new to collections and most of the applications that I build are Create, Read, Update and Delete type applications that don't really need arrays so I have almost no experience with either.
This is what I have so far.
VB
'
Dim iDays As Integer = NumberDaysPerMonth(Date.Now)
Dim DayNumber(iDays) As Integer
Dim EmployeeRecords As List(Of String) = New List(Of String)
For i = 1 To DayNumber.Count - 1
[Code] .....
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Jul 28, 2010
I have problem on my project on vb.net I'm using visual studio 2008. May I know how to do to show all my sales everyday. I have sale almost 5 items every day I want to have list for this. I'm new on vB.net..
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May 23, 2005
I am using ASP.NET and was wondering what i can use in replace of the DoEvents() in vb6?
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May 4, 2009
What's the equivalent of the VB6's DoEvents in .NET?
EDIT:I have a Sub that takes a long time to do its work. (it has a do-while) when I call it, The form turns white. in VB6 I used to put a DoEvents in the method (inside its do-while) to prevent this.
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Feb 27, 2006
I am trying to come up with a way to store 3 pieces of information for each employee in the company on a daily basis. So for instance
Day 1: Joe, 8, 80
Day 2: Sam, 10, 90
Day 3: Bill, 5, 40
Day 4: Bob, 8, 40
Day 5: Sue, 2, 50
most of the applications that I build are Create, Read, Update and Delete type applications that don't really need arrays so I have almost no experience with either.
VB
'
Dim iDays As Integer = NumberDaysPerMonth(Date.Now)
Dim DayNumber(iDays) As Integer
[code]....
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May 28, 2012
I need to create a window service that will check a Date field in the database and on the basis of that date it will send an auto generated mail.I am new in the field of Window service.
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Jun 6, 2011
Any good alternative to using DoEvents in VB.NET
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Jun 2, 2011
I have a search box that works great in WinForms, but is giving me trouble in WPF.
It works by starting a search each time a letter is pushed, similar to Google.
[Code]...
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Apr 9, 2011
I have a simple loop that "sleeps" a thread..Out of nowhere i will get this error below, it could be 1 minute, 20 seconds, 5 seconds, all at random times...how to fix it?
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Dec 22, 2010
I am re-posing this question because the prior post has gotten really full of side issues so I fear the main problems has been lost.I have a windows forms application written in VB.NET which scrapes information from serveral web pages? I am having problem with one particular site where partway through the page navigation my application hangs. When I press pause (or break) in the debugger, it stops on a call to System.Windows.Forms.Application.DoEvents.
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Mar 16, 2009
What is the command of DoEvents in VB2008?
in VB6 when I was doing a loop I wrote DoEvents in the loop to continue with other events.
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Jun 7, 2011
I have a simple 'Working' form that runs on its own thread to keep the user informed that the application hasn't died during long running operations. In order to get the working form to update I had to insert a DoEvents() call. I'm curious, will this only pump messages for the current thread I'm in, or will it do it for the whole application? I would prefer that the main window stay unresponsive till the operation finishes. Just to be clear, I'm fine with the code I have, but I would like to know how DoEvents() behaves with threads.
Below is the code for the working form.
Public Class frmWorking
''' <summary>
''' Creates and starts a new thread to handle the Working Dialog
''' </summary>
''' <returns>The thread of the Working dialog.</returns>
[Code] .....
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Dec 15, 2009
how to exit out of the Application.Do() as i am hanging in that .Here is a sample of my code.
Imports PDFCreator
Imports System.Windows.Forms
Public Class Form1
[Code]....
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Jul 25, 2009
I am not very familiar with VB.NET so I don't know if this is possible.Some code I am working on is setting the properties of a very large class. In the setter of each property an event is raised to indicate that the class data has changed. An event handler then serializes the instance of the class to a database.Obviously I do not want this to happen after each property is set, so I need to either have a delay before saving, or something else.I am keeping a large list of instances in a cache implementation already, so one option would be to only process the cache every now and then and save all unsaved instances in cache to the database.So I tried to see if I could derive a class from Application (and override DoEvents), but it is NotInheritable, so no luck there.
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Mar 8, 2009
My mdi VB.Net application performs a long operation on some data. Ideally I should use a separate thread to prevent the dreaded "Not Responding" message.My problem is if I use a separate thread users then have the ability to click on other controls in the application which can directly affect the operation my background thread is working on, creating an error.
Is there any way to prevent all the mdi windows, toolbars and other controls from receiving mouse clicks and keyboard input during my background thread's operation?
Or is there a way to clear the message que before performing a Application.DoEvents?
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Dec 11, 2009
I have a unique situation in that I've developed a VB.NET application for AutoCAD. The way this works, you build your project into a dll and utilize AutoCAD API references when designing the project. From AutoCAD, a "Netload" command will load your dll into it's namespace to run. AutoCAD then essentially takes ownership of your application from here on out. The application is ran using a command defined in a method's attribute:
<CommandMethod("CommandNameForApp")>Public Sub MyCommand()
'Code Here
End Sub
Due to the heavy load of processing loops as it evaluates AutoCAD drawing data, processes this data, and generates many, many Excel reports, I've added a boolean property called Cancelled to my Progress class. When the user cancel's the process, this is seen by the process and further evaluation is ended and everything is cleaned up nicely. In order for this to work though, I have to implement Application.DoEvents. Without it, the Cancel feature will not work at all. With it, now instead of allowing the application to stay loaded, the Command method is fully closed.I have added a go-to point and simply verify that the application isn't closing because of a user-cancellation event. Here's what it looks like now:
<CommandMethod("WireShop")> Public Sub WireShopApplication()
'Initialize Configuration File Data
'Initializes ValidBlocks, MarginDistance, WindowDistance, and HelpFileName Properties
If ConfigurationFileInitialization() = False Then Exit Sub
[code].....
In my opinion, this seems a little hokey. However, I'm not that familiar with exactly what Application.DoEvents is doing in the background to understand how to "head it off at the pass".
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Nov 9, 2009
I'm trying to automate the process of logging into twitterfeed.com, and filling in the information (the feed url and twitter username are pulled from textboxes). I had it mostly working the other day, even if it is a bit sloppy (the only way I could get one button to click is to send 50-some tabs). However, lately it seems to enter in a sort of loop. When I pause the program, Visual Studio indicates that it is the Application.DoEvents in the Private Sub "wait" that is still running even after it should be.
Public Class Form1
Private feed, username, temp As String
' Code stolen off of a website as an alternative to sleeping, or trying to do a timer + while combo like I had been doing
[Code].....
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Nov 21, 2010
I'm having trouble getting an Applications.DoEvents event to function properly. VB keeps telling me I dont have a valid argument. Can anyone look at this and explain how I would complete the expressiojn for Application.DoEvents.
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Mar 15, 2012
I wrote a small API gui to communicate over foundation fieldbus.I've used a While loop that constantly reads some parameter values from the bus. At the end of the While loop, I put Application.DoEvents()so that I can use another button to stop the reading process. It all seems good and easy.. but there's one problem: when I get the While loop running and wish to stop the process, I have to first click somewhere on the form, anywhere, before I could click any buttons(either 'stop reading' or 'reset' button mostly). That extra click makes my form seem unresponsive and lame.I wonder whether this is a problem pertaining to DoEvents() or my use of Foundation fieldbus.
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Mar 4, 2010
I'm running in to a problem that I was able to fix with Application.DoEvents, but don't want to leave that in because it might introduce all sorts of nasty problems. Background: Our app is primarily a desktop app that makes many calls to a web service. We control everything but changes to the overall system design are not going to be seriously considered. One of those calls, Calculate, is used very often, and occasionally can take a few minutes to process all the data to return valid results.
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Sep 21, 2010
I have a custom control's library. Now there's a control which looks like a panel, and when it opens up I want to animate its vertical growing like this:
For h As Single = 0 To finalHeight Step 0.5
Me.Height = CInt(h)
' HERE I WANT TO CALL DoEvents'
Next
Me.Height = finalHeight
If I don't call DoEvents in the loop then the animation is not shown, I only get the final height without a visual feedback along the way. I can call DoEvents from inside my main WinForm project, but can't inside a library. How can I do that, without drowning into the deep threads waters?
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