ALERT: Event Handling - Capture The Event For When The F1 Key Is Pressed
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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Apr 29, 2011
The image below shows a part of my Login form . The program works fine and I am able to login when I press the Enter Button. But I want to Login when I press My Enter Button (Return Button) on my Keyboard. How can I do this ?
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Jul 23, 2009
I have to handle a particular kind of KeyDown event. I have made a new virtualdesktop for my GPS Windows CE based thats launch an external program (like TomTom). I have to handle and capture event when key wheels are pressed (volume control). I know only like as "Private Sub Form1_KeyDown()" but this function works only when Form1 is focused... How can I continue to get and traps event when my TomTom is still running and focused?
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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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Apr 12, 2010
Normally I just redirect to a custom error page in on the Application_Error event, but I have a specific error for which I'd like to display an alert message while the user is still on the page which triggers the error. How can I make this happen?
I'm open to a modalpopup or any other type of error message, I just want to ensure the user stays on the page where they encounter the error.
This is in reference to this thread: [URL]
Here is the code I'm currently using:
Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
'Code that runs when an unhandled error occurs
Try
[Code]....
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Aug 20, 2011
I am running VS 2008 and building my app on a Windows 7 box. The main form/window has a KeyDown event handler as follows in it:
Private Sub Form1_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
MsgBox("control = " + e.Control.ToString + ", shift = " + e.Shift.ToString + ", e.Keycode = " + e.KeyCode.ToString)
When I build it and run it within VS it seems to run fine. The messagebox appears with the state of the control and shift keys along with the key code of the key I pressed. However, if I take the executable and run it on an XP box (both using .Net Runtime 3.5) as soon as the main form opens, the messagebox appears. Basically the "KeyDown" event seems to be firing without any keys being pressed. The messagebox comes back with: "control = False, shift = False, e.Keycode = None".
How is this possible? How can the keyDown event be fired when no keys have been pressed (as is confirmed by the output contained in the messagebox?) how I can diagnose this on the XP box since it does not have Visual Studio on it?Update I tried creating a brand new project where there is only "form1" and the only code behind this is the keyDown event handler. It just opens a blank window and pops up the message box if a key is pressed. It worked as expected on the Win 7 box but when I moved the executable to the XP box, it immediately popped open the messagebox without pressing a key.
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Jan 13, 2010
I have a tabcontrol with 3 tabs. I can't see where any event is raised when I click the small tab area (where the name of the tabpage is). I see where an event is raised when I click on the tabpage itself. What is the event for the small tab area? I am getting by with a mousemove event over the currently selected tabpage.
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Feb 10, 2009
I am creating a keydown event that when the enter key is pressed it performs the button1_click event. I have this much:
if e.keycode = keys.enter then
//code here
endif
I just need to know how to make it perform the button1_click event.
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Apr 20, 2009
I have an application that the main screen currently has all exit functionality removed by use of a class. I want a certain key combination to exit the program, but cannot figure out how to do this. I.E. Ctrl + X.
[Code]...
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Nov 7, 2011
I know the answer to this is out there somewhere, but my Google isn't being much help on this one. I am trying to make my combobox run an event when the enter key is pressed. Here is my code.
Private Sub CmbQuery_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles CmbQuery.KeyPress
If e.KeyChar = Chr(13) Then
SearchEvent()
End If
End Sub
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Apr 26, 2010
I use DirectInput to control a joystick. Now I use a timer to continuously runs a sub
Private Sub timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
UpdateUI()
End Sub
Public Sub UpdateUI()
' This function updated the UI with
' Joystick state information.
[Code] .....
The problem is this is not very efficient. Now I would like to know if its possible to trigger a sub as soon a button D-sub of analog stick is pressed/moved. I've seen the following:
[URL]
How to implement this?
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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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Jun 12, 2012
I've got a key pressed code
vb.net
Private Sub MainWindow_PreviewKeyDown(ByVal sender As Object, ByVal e As System.Windows.Input.KeyEventArgs) Handles Me.PreviewKeyDown
If Keyboard.IsKeyDown(Key.A) AndAlso Keyboard.IsKeyDown(Key.LeftCtrl) AndAlso
[Code].....
How can I call my Button1.Click event on the 3 keys being pressed???
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Oct 27, 2009
I am using vb.net and i want to fire/execute labels mousehover and other events when user pressed mouse left buttion.For Ex.: i want to execute mousehover event when user pressed left mouse buttion. Without pressing left buttion you can execute but i want to execute with press.
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Mar 12, 2012
Is there a way in VB.NET to make an event when a button is long pressed? Like one thing happens when you only click it and another thing happens when you long click it ..
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Jul 31, 2010
I've read thru Iceplug's tutorial on control arrays and got it working. I tried to add a new event by basically copying his click event code and calling it a doubleclick event. I used the proper addhandler and assigned the correct name to my sub. I have the click event changing the background color to blue and the doubleclick event changing the background color to green. The background color does not change to green. Why?
Heres the tutorial with my new code encased in asterisks ...
Code:
Imports System
Imports System.Windows.Forms
Public Class form1
[CODE]...
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May 21, 2009
i need to capture a key outside of a _Keydown event.
I need the backspace button (0X08)
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May 6, 2012
I'd like to create a WebBrowser for the purpose of taking a screenshot of a website. Once its finished it will update a thumbnail image in a ListView. I'd like the whole operation to be done in the background so the UI remains responsive.I toyed with Creating the WebBrowser in a new thread and calling Navigate. I can use a loop to watch for the ReadyState of the webbrowser before I do the screencapture. However it will only continue with the thread if I use Application.DoEvents in that loop. I've never been a huge fan of doing this and would prefer to watch for an event instead. However if I add a handles clause to the WebBrowser it doesn't fire (I tried creating the WebBrowser in the thread, and also tried by declaring it as shared within the class scope).
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Apr 29, 2010
Ok, so this is VERY simple to do IF I was working with a regular Textbox control. But of course, Microsoft does not have an "AcceptsReturn" property for a MaskedTextbox Control.
So, if the user finishes typing in the MaskedTextbox control and hits the [Enter] key.... How do I capture that key stroke with this type of control? Also, what if this MaskedTextbox is on a UserControl, not a regular WindowsForm?
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Sep 7, 2009
I have the following code to control how a form is shut down. Specifically, when they click the red x at the top of the form. My question is, how do I control the minimize button at the top of the page. I want my forms to minimize to the information bar instead. I know how to send it there if I can capture the minimize event.
Private Sub xmlTest_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
e.Cancel = True '--- will not close form
[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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May 7, 2009
I have 2 listboxes on a form. Each listbox has a few items. As you know, I am able to have 1 item selected from each listbox, therefore making it 2 selected items from different listboxes.
I want to create a keyboard + mouse shortcut so I can de-select or change the selection mode of the listbox when Alt is held down and Left button on the mouse is clicked on the selected item. Here is the code that I wrote, which does not work.
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
If Control.ModifierKeys = Keys.Alt AndAlso e.Button =
[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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