Threading - Access A Value Of A Control Within A Form Outside Of The Form Class
Jun 3, 2009
What is the best way to access a value of a control within a form outside of the form class. I have a lot of functions defined in a module, one of these functions requires a series of values from controls in my main form such as the FolderBrowserDialog.SelectedPath element. I understand that these cannot be accessed in the format form.FolderBrowserDialog1.SelectedPath and that they need to be accessed using a delegate. This is the part I am stuck with.
[Code]...
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Nov 25, 2009
I have created a calendar in VB which works fine when set to the startup form, but when I use the MdiParent form as the startup form and try to display the calendar by use of a control it just shows all the buttons and labels with no values assigned to them. Its almost as if the Calendar_Load event is not working, or not accessing the methods in my CalendarClass.
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Feb 18, 2011
I am new to .NET 4 and VS 2010. I am using VB 2010 and have made a class and need to know how i can access those functions in the class within another form. So there is a function say of XYZ in the class named classes.vb and need to get to it from form1.vb
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Oct 27, 2011
I have a few forms that have a lot of really intensive updating along with a great deal of user interface (text boxes, button clicking etc) Is it possible to open a separate form as a separate UI thread from the start up form that called it to "show" or open or whatever the new method might be?
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Oct 18, 2009
I need to be able to access a progressbar in my form from a separate class.
I tried
Dim Prog as Progressbar
Public Property Pg()
Get
[Code].....
I need to be able to access a control from a separate thread and return to the thread again.
Edit: Its just an example I gave prog a value of the object from the form and the invoke required is put in a sub so thats not my problem.
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Oct 27, 2009
I have trouble to control my form using with the class library. I am trying to set the form to maximum and set the form border to none. There is an error in come to the end of the statement next to the test.myform.[code]The error I have received is Object reference not set to an instance of an object.
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Jan 14, 2010
I want to create a library (.dll) of custom dialog forms. Which type of project do i make? Class Library, Windows Forms Control Library, other? Whats the difference between the two?
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Oct 22, 2009
I want a string and a listbox, both which are in a form to be modified by an instance of a class method. Should (could I):
1. Pass the entire form to the class method as parameter.
2. Pass the listbox and the string to the method as parameters.
What's the best approach to get access and modify this string and listbox on the form.
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Nov 10, 2011
I have a class that gets 2 label controls passed to it byRef. So, while my class is being executed I want the labels on the form to be updated. This works Most of the time, but sometimes it seems the form stops updating till the class has finished its process...below is some of the code that I am using to do this...
Public Class clsImportWWDB
Implements IDisposable
Private strSearchTag As String = "" 'Last Tagname of value scanned
Private intMeldsFound As Int32 = 0 'Number of Alarm Messages Found
Private _MyForm As Windows.Forms.Form
Private _FileName As String
[Code] .....
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Aug 26, 2011
Im Using VB 2008. I have MsgBox() statements in all Mouse & Form Click events to TEST & NOTHING FIRES during Form Load when I click on Form or Button Controls !!! The Form Load event contains code for Displaying the Label.Text control many times with changes in the Text to simmulate annimation.
[Code]...
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Jun 4, 2011
I am making a TabStrip control to hold a number of tabs just like TabControl, but only with the tabs, no page. The control has a "Tabs Collection", which stores a list of "Tab" class. "Tab" is not inherited from Control, but each tab has its events. So when the user add a "Tab" in the "Tabs Collection", each "Tab" instance should have a (Name) identifier, which user can access it in the code, and with WithEvents keyword so users can add event handlers to each "Tab". The expected out come should similar to this:
Friend TabStrip1 As TabStrip
Friend WithEvents t1 As Tab
...
Me.TabStrip1.Tabs.Add(t1)
[Code]....
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Dec 6, 2011
I have a form named VBProject It has two TextBoxes and one custom control named MyControl which is created in another project.MyControl's project has a form inside, named Form3. When My control is loaded it needs to find all controls in my VBProject and add them into a listbox which is in Form3. Then Show the Form3. In the end ListView need to shows name and text of textboxes but it shows nothing. Here are my codes:
MyControl's Load_Event:
Dim i As Integer = 0
MessageBox.Show("Control Count:" + Me.Controls.Count.ToString)
For Each MyObject In Me.Controls
If TypeOf MyObject Is TextBox Then
[code]...
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Sep 9, 2011
Is there a way to have a desktop vb application take control of an already open browser window? For example, have it mouse click certain coordinates in the window or check if the window contains certain elements.
I've looked at using Microsoft Internet Controls(shdocvw) and MSHTML(IHTMLDocument2) but I am struggling on how to access elements of the browser window (e.g. body.innnerHTML).
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Apr 9, 2010
I designed a class contains a form that have buttons. When i click any button this function runs
Public Sub BtnClick(ByVal sender As Object, ByVal e As EventArgs)
result = CType(sender, Button).Text
[CODE]...
In another project I imported this class. I called the method that shows the form in my class. I need to store the 'result' variable in another variable in the new project. How can It be done.
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Dec 4, 2009
Visual Basic Project - Student Check In Form using an Access database backend This form needs to draw information from an Access database containg tables for STUDENT, INSTRUCTOR, and SECTION. These all need to have primary keys and ids. When (the user) clicks on the drop down box that displays all the sections:
{Table Tennis 1, Table Tennis 2, Table Tennis 3, Billiards 1, Billiards 2, Billiards 3}This should populate the listbox or datagrid from the STUDENT table with the Students that have the same SECTIONID as the SECTION selected in the drop down menu above.
After the Student list has been populated (the user) clicks on a student name in the listbox/datagrid and this inserts that student into the CHECKEDIN table that has a datagrid/listbox associated with it.
This is a great project to practice connecting a database to Visual Studio 2008 .net and playing with the data that has been pulled in. You could use SQL instead of Access.
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Aug 18, 2009
I have a windows application with a main form, on which a user control is added dynamically when a device connects trough USB.
On a user control, there is a thread wich is getting data from the device trough USB and when it is finished, I want to change a progressbar that is located on the main windows form where user control reside.
This is the code that is I call on the user control thread to change the progress bar value:
Frm_Main.UpdateProgressBar(CInt((AllBytesReceived / MaxBytesInFlash) * 100))
and this is a code that is called on the main form:
Private Delegate Sub UpdateProgressBarDelegate(ByVal value As Integer)
[Code]....
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Feb 11, 2009
I want to build in the Mongoose web server into my application. My program consists of a form and a module. The module contains the Mongoose code copied from here: [URL] If I call the Main() function in the module from my form's Load event then the web server starts correctly and I can connect to it. However, that's as far as the applicaiton goes - my form doesn't load up. I guess this is because my application is only single threaded and the Mongoose code basically puts the thread into sleep mode waiting for a http request.
So, the question is how do I go about getting Mongoose into a separate thread that starts up when my application starts, but then allows my form to load and be operable?
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Aug 15, 2011
I'm upgrading some code from VB2003 to VB2010. I'm now getting an error when I try to close a form from a media player event.
[Code]...
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Oct 7, 2009
I made a UserControl with a button on it. I then added that UC to a form by dragging from the toolbox. Now I want to be able to access the click event of the button on that UC control in the form code. How do I do that?
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Jan 4, 2012
I thought Me.Close() works, but hey I'm a noob at this. Right now I'm using:
Form2.Show()
Me.Dispose()
Me.Close()
but now that I've published it, I have to pull up my task manager and do end process to actually close the app. This wasn't a problem until my office started using a public drive and everybody was using the program at once. An error popped up saying that the connection string wasn't initialized, but it worked on the computer that opened the app first. Maybe the real issue isn't properly closing the form, but that is annoying that I have to use my task manager to close my app.
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Feb 23, 2010
I'm not sure how to explain what's happening but it seems to be deadlock, i did search along the forum and actualy did find who had the same problem as i did. Unfortunatly i'm too new to this Threading and could not understand why does this deadlocks happen or how to avoid them.I'm using the following
Dim t As New Threading.Thread(AddressOf MyTestingSub)
t.Priority = Threading.ThreadPriority.BelowNormal
t.IsBackground = True
[code].....
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Feb 18, 2010
Hi
I've got a pretty general question about the best practice in passing an object reference to a Form in VB.NET. My form is a dialog and I've created an overload ShowDialog method, where I pass an Object into it ByRef.
The trouble is, I want to be able to refer to that Object throughout my dialog Class and not just in the ShowDialog method. For instance, some of my Events for controls on the form, need to reference that object.
I know I could create a local Private variable in the Class and assign it to the passed value, and then use that value. However I'm thinking this isn't very efficient because it would (I believe) create a new copy of the Object (which is a complex, large class in itself).
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Apr 15, 2010
I have put this code in the global form Inherits System.Windows.Forms.Form. And then in the form that will inherit this from the global Inherits MenuStrip. "MenuStrip" is what the global form is called. But keep getting this error: Error1Base class 'MenuStrip' specified for class 'Lesson2' cannot be different from the base class 'System.Windows.Forms.Form' of one of its other partial types.
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May 19, 2012
Two Forms 1. "SplashForm" 2. "MainForm" I want to load "MainForm" AS background Process of "SplashForm" process when "SplashForm" process end i just want to show the "MainForm" which should be already loaded code
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Jul 20, 2010
The coding that I have a problem with might make people think that I am creating some malware. So the project I am doing is associated with iTunes. iTunes allows people to have one library. There is another way, but it is very confusing to some people, and very unreliable. So my project is that I will allow people to have multiple iTunes libraries on one computer. So the problem is this. In order to have an option to choose your library, I gotta make sure that iTunes is not running.
So this is the script:
Private Sub CheckAndCloseiTunes()
retry:
'Custom class that includes the function to safely close iTunes
Dim Processes As Process() = Process.GetProcessesByName("iTunes")
[CODE]...
So when I use the Threading.Thread.Sleep(2000) code, the form becomes unresponsive.
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Oct 28, 2010
Here is the pertinent part of my code:
Public Class Form1
Inherits System.Windows.Forms.Form
Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code].....
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Mar 12, 2009
I have a basic Windows form with one Crystal Reports form veiwer control on it. When ran on the development machine it displays the report fine.After build and publish the application is now installed on a user PC. I am getting an error that the Crystal Decisions. Windows. Form version 12.0.2000.0 can not be found. All the Crystal dll's are in the install directory but none of them are being installed in the install machines GAC.Am I setting my publish output up wrong, may references wrong, or is the local GAC files the problem. The message is so criptic, it doesnt really point me in the right direction.
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Jun 18, 2011
I have 2 forms main_frm and copying_frm. In main_frm, there is a list view that is populated with file names. The user then clicks save and all the files in the list are copied to a folder that they choose using a folder browser dialog. When this happens, I do copying_frm.ShowDialog() to display the copying_frm. The copying_frm contains a progress bar and a cancel button. I can get the progress bar to indicate how much has been copied. But that freezes up the application. To get around this, I create a new thread (called copyingThread) that copies the files. When that thread runs though, it can't access the waitingList_lvw in main_frm. For example, in the function that the copyingThread executes, if I have this line of code: MsgBox(main_frm.waitingList_lvw.Items.Count.ToString()) the result is 0. Also, I don't get any errors and no files are copied. How do I access waitingList_lvw in main_frm from a thread called copyThread that was created in copying_frm?
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Jan 10, 2011
Communication between form can be done in many ways using constructor using delegates etc in .net but my question is how can i access a value that is entered into a child form from a parent form or can a two way communication is possible between windows forms.
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Sep 16, 2011
How to display contents of ms access database form on a form using vb .net...in visual studio
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