I am very new in coding. I can work myself around a working program but this is my first time creating from scratch. Here is my code, yes I know it's probably messy right now.
What I am trying to do sounds simple enough logically.
theory:
This app has multiple buttons when clicked each one will bring up a question. once answered the labels will change to ask another question. so on and so fourth until I run out. This is intended to be a user simple application for step-by-step troubleshooting some test equipment.
I can't seem to figure out why I can't just say if buttonYes=true then blah blah. I don't feel that it is complicated as it seems. I have searched around the forums but I can't seem to find anything like this.
App
Public Class Form1
Class EventHandler
Public Event buttonYes(ByVal Status As String)
Private Sub buttonYes_Click(ByVal sender As Object, ByVal e As EventArgs) Handles buttonYes.Click
RaiseEvent buttonYes("True")
End Sub
End Class
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
buttonYes.Hide()
buttonNo.Hide()
title.Hide()
question.Hide()
action.Hide()
title.Text = ""
question.Text = ""
action.Text = ""
End Sub
Private Sub buttonNo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonNo.Click
Dim ans As String
ans = "False"
End Sub
Private Sub CompButton(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles compFail.Click
buttonYes.Show()
buttonNo.Show()
title.Show()
question.Show()
action.Show()
title.Text = "Component / SAT"
question.Text = "Are all cables seated properly"
End Sub
Private Sub ComponentFail(ByVal ans)
'Dim ans As String
ans = ""
If ans = "False" Then
action.Text = "Check cable connections and retest"
End If
End Sub
Private Sub buttonYes_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
End Sub
End Class
Related
That might have sounded weird so let me explain.
I have a school assignment that has me pulling my hair out. I have to get a collection of 5 facts and have them display to a ListBox using a For Next Loop. The user would use an InputBox to input the facts.
I dont know what to put in the For Next to fetch the string from the InputBox. I'm at my wits end and am falling behind.
Here is what I have so far
Public Class frmWWIIFacts
Private Property RemoveAt As Integer
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub AddFactToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddFactToolStripMenuItem.Click
Dim intFact As Integer
Dim strInputFact As String
strInputFact = InputBox("Do you want to add a fact?", "Add a fact")
For
Next
strInputFact = InputBox("Do you want to add a fact?", "Add a fact")
End Sub
Private Sub CloseToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CloseToolStripMenuItem.Click
Application.Exit()
End Sub
Private Sub ClearListToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ClearListToolStripMenuItem.Click
lstFacts.Items.Clear()
End Sub
Private Sub RemoveFactToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RemoveFactToolStripMenuItem.Click
End Sub
I've submitted a reddit post requesting some assistance but its gotten me nowhere. https://www.reddit.com/r/learnprogramming/comments/3t614u/vb2015_using_menustrip_to_addremove_items_in_a/
I would love some help on this. Please ask questions if your confused on my method or if you need to know more.
Sounds like you're trying to do this:
Private Sub AddFactToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddFactToolStripMenuItem.Click
Dim intFact As Integer
Dim strInputFact As String
lstFacts.Items.Clear()
For intFact = 1 To 5
strInputFact = InputBox("Please enter a fact:", "Add a fact")
If Not strInputFact = "" Then
lstFacts.Items.Add(strInputFact)
End If
Next
End Sub
I am a beginner and please show me how to pass the parameter object Person to Button.Click event. I'm using vb.net. Here is my code:
Public Class Form1
Public Class MyPersonClass
Public Name As String
Public Age As Integer
Public Title As String
End Class
Public Sub DisplayPerson(ByVal person As MyPersonClass)
Label1.Text = person.Name
Label2.Text = person.Age.ToString()
Label3.Text = person.Title
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
End Sub
End Class
You don’t – Button1_Click is an event handler, you’re not supposed to call it manually. It gets called, with predefined parameters, when a certain event occurs. You cannot really adapt these parameters, simply because it doesn’t make sense: the event would no longer know how to call the handler.
You can easily write your own method and pass any object to it, of course. And you’ve done exactly that with DisplayPerson.
Private ExamplePerson As MyPerson
Private Sub Form_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ExamplePerson = New MyPersonClass 'thanks Chris Dunaway for the correction
ExamplePerson.Name = "Test Name"
ExamplePerson.Age = 36
ExamplePerson.Title = "Title Name"
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
DisplayPerson(ExamplePerson)
End Sub
I am trying to pass a value of a textbox on frmMain to a textbox on frmDepartment. I have tried the following code which I thought would work but it dosen't. I ma a new user to VB and come from a php background where it would have been a simple task of setting a seesion. Can anyone help with this? If you need to see more code, please ask. many thanks
txtDeptCustomer.Text = frmMain.txtCustomerActive.Text
In frmMain, I am getting value like this:
Dim value As Object = UserDataGridView.Rows(e.RowIndex).Cells(0).Value
txtCustomerActive.Text = CType(value, String)
Private Sub btnDepts_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDepts.Click
frmDepartment.Show()
End Sub
Which is showing in frmMain ok.
In frmDepartment I have this code
Private Sub txtDeptCustomer_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtDeptCustomer.TextChanged
'Dim customer As String
txtDeptCustomer.Text = frmMain.txtCustomerActive.Text
End Sub
instead of putting the code within the txtDeptCustomer.TextChanged sub, try putting it within the frmDepartment_load:
Private Sub frmDepartment_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
txtDeptCustomer.Text = frmMain.txtCustomerActive.Text
End Sub
or you could set the frmDepartment text box text on the frmMain button click:
Private Sub btnDepts_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDepts.Click
frmDepartment.txtDeptCustomer.Text = txtCustomerActive.Text
frmDepartment.Show()
End Sub
I would like to know how I should code my VB.net application to react to the form load event in a third-party application (also written in VB.net)
To test, I have created two basic programs, one with two forms (program A) and one (program B) that attempts to the listen to program A's appropriate form load event. I have tried using WithEvents but it does not get fired when Program's A second form loads.
Here is the code for Program A:
Public Class StartPage
Public WithEvents loadtimer As New System.Windows.Forms.Timer
Private Sub StartPage_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
loadtimer.Interval = 1000
loadtimer.Enabled = True
loadtimer.Start()
End Sub
Private Sub loadtimer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles loadtimer.Tick
loadtimer.Stop()
SystemStatus.Show()
End Sub
End Class
Public Class SystemStatus
Inherits StartPage
Private Sub StartPage_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.Label1.Text = "This is the form that I want to listen for the load event"
Me.loadtimer.Enabled = False
End Sub
End Class
Here is the code for Program B:
Imports Program_A
Public Class ListeningForm
Dim WithEvents testlisten As New Program_A.SystemStatus
Private Sub testlisten_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles testlisten.Load
Label1.Text = "SystemStatus form loaded"
End Sub
Private Sub ListeningForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Label1.Text = "Waiting for SystemStatus load event..."
End Sub
End Class
I am quite new when it comes to programming so maybe this is not even possible or I just haven't been understanding what I've been reading. In any case please enlighten me as to what my next course of action should be.
Thanks very much in advance,
theoleric
This will do what your asking.
Imports Program_A
Public Class ListeningForm
Dim WithEvents testlisten As New SystemStatus
Private Sub testlisten_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles testlisten.Load
' now this event will fire
Label1.Text = "SystemStatus form loaded"
End Sub
Private Sub ListeningForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Label1.Text = "Waiting for SystemStatus load event..."
' the load event will not fire until you call this
testlisten.Show()
End Sub
End Class
Hey all i am trying to figure out why my 2nd form is not displaying the value i recived in my first form.
The code for the first form is:
Private Sub scannerOnCom_DataReceived(ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs)
responceBack = scannerOnCom.ReadLine
Call frm1110.clickButton(responceBack)
End Sub
The second form code is this:
Public Sub clickButton(ByRef theResponse As String)
txtNumber.Text = theResponse
'Call cmdNextFinish_Click(Nothing, Nothing)
End Sub
However, when i debug it to make sure there is something stored for theResponse, there is but for some reason it does not put it into the textbox. It's blank.
Any help would be great!
David
UPDATE
Ok so Form1:
Dim tmpForm3020 As New frm3020
Private Sub cmd3020_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmd3020.Click
tmpForm3020.Show()
Me.WindowState = FormWindowState.Minimized
End Sub
Private Sub scannerOnCom_DataReceived(ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs)
responceBack = scannerOnCom.ReadLine
tmpForm3020.txtNumber.Text = responceBack
End Sub
If thats correct then i get an error on line:
xForm.txtNumber.Text = responceBack
Saying:
Cross-thread operation not valid: Control 'txtNumber' accessed from a thread other than the thread it was created on.
Are you explicitly creating an instance of your second form, or relying on the default instance? I.e. is "frm1110" the second form's class name, or an instance that you have new'd up? Make sure in either case that it is the same instance that is actually being displayed.
Dim tmpForm3020 As New frm3020
Private Sub cmd3020_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmd3020.Click
tmpForm3020.Show()
Me.WindowState = FormWindowState.Minimized
End Sub
Private Sub scannerOnCom_DataReceived(ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs)
responceBack = scannerOnCom.ReadLine
TestData(responceBack)
End Sub
Private Sub TestData(ByVal xVal As String)
If InvokeRequired Then
Me.Invoke(New MethodInvoker(AddressOf TestData))
' change Me to tmpForm3020 (if it does not work)
' tmpForm3020.Invoke(New MethodInvoker(AddressOf TestData))
Else
tmpForm3020.txtNumber.Text = xVal
End If
End Sub