Handling Rapid Event Triggers?
Apr 22, 2010
I am using an activeX control to read data from an external source. This data is processed in 5 second increments. Each piece of data is passed through an event. When the event triggers I call a "decision" procedure from the event to process the data and make decisions on what to do, i.e. call other procedures, store the data, etc... This works fine when I have a small number of samples (around 10), however, when the number of samples increases to say 100, that is I am recieving 100 pieces of data every 5 seconds, the "decision" procedure does not fully run. Is it possible that the event trigger is causing the code to exit the "decision" procedure prematurely? I know that the "Decision" procedure starts since I have written data from the beginning of the procedure but not the end of it. how to handle the rapid event triggers?
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Oct 19, 2009
I use the following code in a Sub called "updateDb" to accept changes back to the Db, etc. in the .CellEndEdit event from a DataGridView:
Try
' Write changes back to actual .mdb file
' Accept changes from DataGridView object
Me.Validate()
[code]....
Which is the most appropriate event to handle for this task? Right now I'm calling the updatedDb sub when the .CellEndEdit event triggers and when the .UserAddedRows event triggers.
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Jun 28, 2009
I have a custom class. I would like to add an event that triggers when the form it is on resizes. Is there a way to do this?
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Jun 11, 2011
Anyone know how to make the return key used in a text box trigger an event?
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Nov 3, 2009
I have a datagridview which is populated from the SelectionChangeCommitted event of the combobox. The datagridview contains both bound and unbound data columns (see below).
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Jan 8, 2012
[code]I get an error that the connection to the IMAP server has disconnected because the suspend event is not triggered until the computer wakes. How do I get the trigger before the computer sleeps?
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Feb 13, 2010
I have a message box with YesNoCancel button..
Pressing Yes will do some action and close the app - works fine,
Pressing No will do nothing and close the app - (see below),
Pressing Cancel will Do nothing and keep the app open - (see below).
I'm using DialogResult.No for No button and DialogResult.Cancel for cancel button. But pressing either of them triggers DialogResult.Cancel event. Whats the problem?
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Jun 26, 2010
I'm working on a program with a fairly complex graphical interface. Due to the volume of information possible in the interface, the tooltip, or something like it, seems likely to be a fairly critical means of obtaining feedback. However, after a bit of testing, there are a few features that I am not really enamored with. First, I am changing the tooltip text dynamically based on the portion of a control that the mouse hovers over. This is done in the Hover event handler. What I am seeing is that once the hover event is raised once for a control, it appears not to be raised for that control again unless the mouse leaves the control and re-enters. Therefore, the tooltip is set based on where the mouse hovers the first time it hovers on the control, then doesn't change until the mouse has left the control.
More disturbingly, the tooltip sometimes doesn't show up at all. It appears that if I am quick enough about moving the mouse over the control, then hovering does nothing and no tooltip shows up at all. The way to get the tooltip to show up is to move the mouse smoothly, and somewhat slowly, over the control, then pause. As long as the motion is slow enough, the tooltip always shows up. However, if the mouse is then moved, the tooltip goes away, and won't return until the mouse has left the control and come back to it. So basically, First, I will look into showing something on MouseMove rather than Hover, as Hover appears to be inconsistent, at best. Yet that doesn't solve the problem that the tooltip is too inconsistent in behavior. Is there an alternative, or timing property settings for the tooltip that improves responsiveness?
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May 12, 2008
I am writing a web page, on this web page there is a txtStart and txtEnd. Next to them I have Calendar ImageButtons. I would like to code it so when the ImageButton is clicked a calendar popup appears and when they select a date on the popup it goes away and the date is populated into the txt. Format MM/DD/YYYY. Can anyone help me? I have been looking online for hours now and only find solutions for C# users or for a seperate page all together. I am writing my code in VB and I cannot make new pages. Here is my web page code:
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="PSInventoryRelease.aspx.vb" Inherits="DigeControlCenter.PSInventoryRelease" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="TC" %>
[code]....
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Nov 16, 2010
I've been searching for the answer for this all over, but I can't seem to find the solution. I have no idea how do this. A code that triggers an event after multiple command buttons are pressed in a certain order. For example: I press Command1, then Command2, then Command8, then Command5, then an event happens. It's kind of similar to entering a code to activate something.
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Feb 15, 2011
I have alot of experience in working in VBA for excel, but not so much experience in creating my own structures so it's all still a bit foggy. I'm trying to capture the event for when the F1 key is pressed, not just when the form is active, but anytime the program is running. The code below expressing the handling is automatically generated for me in VB Express... But I'd like to change the situation to encompass anytime the program is open. I guess I have to reference events that happen in windows in general, but i don't know how to do it. I think i have to create the even in a class module?
[Code]...
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Jan 16, 2009
i declared a global variable button:
Dim button1 As New Button()
Now, i dont know how to add a click event in this button since it is a variable.
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Sep 21, 2011
I'm completely confused about the event handling. I read some articles about it but after it I just get confused to write and use them in my classes.This is my class i. e.:
[Code]..
I dont have any argument passing. But I want to know how should I do it too. And I wanted to know if each instance of the Test class, run this event separately I mean each instance by themselves, This event AnEvent() will occur? Cuz I have lots of instances from my class.
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Aug 31, 2010
I am developing a COM dll library, and I have a little vb.net (vs 2005) application just to test it.I had my object declared in the application as
Private m_VarName As MyLib.CMyComClass
So far, so good.But now, I need an event to inform the application of some things, so I implemented such event in the COM dll, and changed the declaration to
Private WithEvents m_VarName As MyLib.CMyComClass
So far, so good, again. But if I add a Sub to handle my event:
Private Sub m_VarName_OnCaptureStop() Handles m_VarName.MyEvent
..
End Sub
The first time I create the object, nothing bad happens, but if I reinstantiate it
If (Not m_VarName Is Nothing) Then ReleaseComObject(m_VarName)
m_VarName= New MyLib.CMyComClass
then I get a cryptic TargetInvocationException, seemingly related to reflection (which, AFAIK, I am not using).If I remove the "Handles m_VarName.MyEvent" part, everything seems to work. In case it matters, I am not firing any event, for now.
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Nov 18, 2010
NET gurus... How would you convert this very chunk into VB?
[Code]...
When I use an online converter (Telerik), the middle line converts like this: Me.timer.Elapsed += New System.Timers.ElapsedEventHandler(ManageThreads) with 2 errors:
1- "Public eventElapsed is an event and cannot be called directly. Use raiseEvent
2- Delegate requires an Adess Of expression. Do I simply add "Address Of" ?
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Dec 1, 2011
I have an event defined and firing in class B
Public myEvent()
In class A:
Private WithEvents _b as B
Private Sub hander() Handles _b.myEvent
but, this handler does not get called.
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Dec 15, 2011
I've been trying to figure out how to get this control to work for over a week. It can be found here: A Professional Calendar/Agenda View That You Will Use - CodeProject. It's a calendar/scheduler control that was designed using c# and I'm trying to use it in my vb.net app. I've sucessfully created a dll and have referenced that dll in my project and am able to see the controls in the toolbox as well as put them on my form. My problem is that I can't get ANY of the code that I wrote in the form to fire. No event handlers will work, not even the form_load which handles the mybase.load event. Nada. f a reason that this might be? How do I sucessfully add a handler to the events? I've used <code> addhandler monthView1.SelectionChanged, addressof (and nothing I put here ever works) </code>
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Jun 15, 2009
I have come accross many scenarios of handling datagridviewcombobox events, however none seem to fit my scenario, or I may be missing something.1. I need to capture the column index that the combobox is resident in. This is because I have a complete row of comboboxes that should set the header text to the selected value.here is the code I have so far:' I also use a list of string as datasource publicly declared
Public cs As New List(Of String)
'to insert the combo's into the grid
Dim row As New DataGridViewRow
cs.add("Book")
cd.Add("Author")
[code]....
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May 27, 2011
how to write below in vb.net??
Me.connection = New RAPI
connection.ActiveSync.Active += new ActiveHandler(ActiveSyncActive);
Private Sub ActiveSyncActive()
..................
End Sub
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May 7, 2009
I can come up with, if I understood the solution better, I could probably phrase a better subject line.[code]...
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Apr 18, 2010
Is it possible to handle a mouseDown event in VB.Net (2008) regardless of the control firing the mouseDown event? Basically, I just want to catch a mouseDown event at the "form level" and don't want to program mouseDown event handlers in every control. Is there a way to do this?
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Sep 13, 2009
I have an object Order with a simple event, Public Event ErrorOccurred(ByVal msg As String)that I raise in the constructor like so when an order cannot be found (along w/setting a boolean error flag:
RaiseEvent ErrorOccurred("This order does not exist in the database.")
[Error] = True
I have a webform subscribed to the order's ErrorOccurred event:
Public WithEvents o As New Order
and I have an error handler method on the form:
Private Sub OnErrorOccurred(ByVal msg As String) Handles o.ErrorOccurred
litMsg.Text = "<p class=""error-confirm"">" & msg & "</p>"
End Sub
When a textbox is changed, it autoposts back to the page and employs the following logic:
Private Sub txtOrderID_TextChanged(ByVal sender As Object,_
ByVal e As System.EventArgs) Handles txtOrderID.TextChanged
If IsNumeric(txtOrderID.Text) Then
[code]....
When there is an error (when the Else logic is run), everything performs as expected except the event does not fire. However, since the Error flag is set to true, it means the event MUST have fired, since that line executes AFTER the RaiseEvent line. I've tried everything I can think of, but I cannot figure out what could be wrong. I have events strewn everywhere in my project and they all work well using virtually the same structure.
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Nov 16, 2009
I need to create event handler for Outlook event 'item send'. This is to capture the event before email get actually sent. I could generate this event handler in C# within seconds but having problem to do it in VB. Any translation online
C# code:
private void Form1_Load(object sender, EventArgs e)
{
[code].....
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Mar 11, 2009
I've 2 projects- one containing GUI and another a DLL project containing some implementations. I'm using Classes in DLL in my GUI. All that I wanna do is when some results are manipulated in the DLL, the final output from DLL should be made available in the RichTextBox present in the GUI project. I tried the WithEvents and also Add Handler. But its not working.In the DLL, I added...
Public Event Report(ByVal info As String)
RaiseEvent Report("The folder has been Copied.") In the GUI, I added...
Public WithEvents Log As RTAF_DLL.CServer // RTAF_DLLis the project name.
CServer is the class // in which the event has been writtenLog = New RTAF_DLL.CServer
Protected Sub Log_Report(ByVal info As String) Handles Log.ReportMsgBox(info)
// Even this is not getting printedMe.RichTextBox2.AppendText(info)End Sub
The problem here is I'm not sure whether or not the event is getting raised. But I set a breakpoint and found that the Event is not handled.I tried including Imports System.Runtime.InteropServicesBut its not working.
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Jul 6, 2010
Basically, I have a custom child form class which has events that will be passed to the parent. In the custom child form, I have a declaration of a "MustInherit" class that inherits the DevExpress User Control Class.
The reason for this, is I have many user controls that derive from this base class, and the child form can have an instance of any one of these controls, and doesnt care which. The only requirement is that the child form can handle the same events from each type of control the same way.
Some watered down code snippets(still pretty long unfortunately):
'''Inherited Class
Public Class ChildControlInheritedClass
[Code].....
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Dec 22, 2010
I'm trying to raise an event in class A and catch it in class B which does not contain class A. Is this possible? [code]
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May 22, 2011
I'm developing an application, where I want to show a video and afterwards resume working. However, It seems that the event handler isn't working proberly. The video starts to play, the way I have it expected, however after finishing no message box shows.
Private WithEvents AudioDatei As Audio
Private WithEvents VideoDatei As Video
Private Sub play_video()
[Code].....
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Jul 5, 2011
I've created a private internet explorer for personal use but when New Window Event occurs, Default Internet Explorer opens! How can I handle the URL of the New Window and use that for opening a new tab in my explorer navigated to that URL?
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Aug 8, 2009
What I'd like to do is raise an event inside a clsGateway instance running inside its own thread and have that be consumed by a clsLoader instance which is also running inside its own thread.
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Feb 24, 2012
I have a form with several buttons on it and when the user presses one of the buttons it begins a lengthy process (takes up to several seconds). What I want to happen is that any subsequent button presses that occur on any other button on the form are ignored until the process is complete from the initial button press. What actually happens is that subsequent button presses go into a queue and are executed in sequence as the processes for each complete. What I mean is, if each button executes a function that takes 2 seconds and I hit 5 buttons very quickly (in less than 2 seconds say) it leads to a sequence of events that takes 10 seconds.... what I want to happen is for it to lead to only the FIRST button press occurring and taking the 2 seconds that it's activated function takes.
I am writing software that interfaces with hardware through a USB to UART converter and am using virtual COM ports and timing is critical. I want something to occur ONLY when I press a button, not seconds later after being queued up and waiting for a previous operation to finish.
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