[RESOLVED] *Ironic angry face* Dynamically creating methods for dynamically created buttons

[957]

Okay, I have this code.

Public Class Form1

    Dim NPB As Button
    Dim x As Integer

    Private Sub NewProgramToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NewProgramToolStripMenuItem.Click
        Dim OpePro As String
        OpenFileDialog1.ShowDialog()
        OpePro = OpenFileDialog1.FileName
        Process.Start(OpePro)
        x = x + 25
        NPB = New Button
        NPB.Text = OpePro
        NPB.Left = 5
        NPB.Top = x
        Controls.Add(NPB)
    End Sub
End Class

As you can see, when I open a program from my menu, a new button will be created with text similar to this, "C:\Program ". The button it self will not do anything. How can I create the method at the same time the button it is for is created? Also how can I change the text do that it gives me, for example, CCleaner.exe instead of the whole target path? Also, I scream like a gerbil being hit on by a donkey in Tijuana.

[dglienna]

http://social.msdn.microsoft.com/For...a-19fe87a5a920

[957]

The link does not mention how to dynamically add a new function. By the way, I think I forgot to thank you in the other thread.

[957]

Okay, I got this far

Public Class Form1

    Dim NPB As Button
    Dim x As Integer
    Dim OpePro As String

    Private Sub NewProgramToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NewProgramToolStripMenuItem.Click
        OpenFileDialog1.ShowDialog()
        OpePro = OpenFileDialog1.FileName
        Process.Start(OpePro)
        x = x + 75
        NPB = New Button
        NPB.Text = OpePro
        NPB.Width = 75
        NPB.Height = 62
        NPB.Left = x
        NPB.Top = 0
        Controls.Add(NPB)
        AddHandler NPB.Click, AddressOf Button1_Click

    End Sub

    Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Process.Start(OpePro)
    End Sub

End Class

When I create a second button this way to open a different program, the first button is overwritten

[Alsvha]

I've never done something similar to that, but my guess is that the reason your button is overwritten is that you use the same button variable

Dim NPB As Button

Therefore by assigning a new object to the variable, you loose the reference to the old one.

If you need a class variable for the button, try adding the button to a button list instead.
Something like

Dim myButtonList As List(Of Button) 
......
 Private Sub NewProgramToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NewProgramToolStripMenuItem.Click
       ....
        x = x + 75
        dim NPB = New Button
        NPB.Text = OpePro
        NPB.Width = 75
        NPB.Height = 62
        NPB.Left = x
        NPB.Top = 0
        Controls.Add(NPB)
        AddHandler NPB.Click, AddressOf Button1_Click
        myButtonList.Add(NPB) '      (remember to instantiate the list variable at one point)
    End Sub

Whether it'll work I don't know because as I say I've not tried it myself, but off the top of my head - it might.
Also you can use other collection types if you like and they serve your purpose.

[957]

That seems like I would have a redundant amount of code just to make other buttons. I was thinking more along the lines of a an array

[957]

In other words, I want to click on only one thing to create multiple buttons with separate functions.

[957]

no progress with this

Public Class Form1

    Dim OpePro(7) As String
    Dim posl As Integer
    Dim NPB As Button

    Private Sub Task_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Task.Click
        System.Diagnostics.Process.Start("taskmgr.exe")
    End Sub

    Private Sub Calc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Calc.Click
        System.Diagnostics.Process.Start("calc.exe")
    End Sub

    Private Sub Add_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Add.Click
        OpenFileDialog1.ShowDialog()
        OpePro(0) = OpenFileDialog1.FileName
        OpePro(1) = OpenFileDialog1.FileName
        OpePro(2) = OpenFileDialog1.FileName
        OpePro(3) = OpenFileDialog1.FileName
        OpePro(4) = OpenFileDialog1.FileName
        OpePro(5) = OpenFileDialog1.FileName
        OpePro(6) = OpenFileDialog1.FileName
        OpePro(7) = OpenFileDialog1.FileName

        posl = posl + 75

        NPB = New Button
        NPB.Text = OpePro(0)
        NPB.Width = 75
        NPB.Height = 62
        NPB.Left = posl
        NPB.Top = 0
        Controls.Add(NPB)
        AddHandler NPB.Click, AddressOf Button1_Click

        NPB = New Button
        NPB.Text = OpePro(1)
        NPB.Width = 75
        NPB.Height = 62
        NPB.Left = posl
        NPB.Top = 0
        Controls.Add(NPB)
        AddHandler NPB.Click, AddressOf Button2_Click



        For i = 0 To OpePro.Length - 1

        Next

    End Sub

    Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Process.Start(OpePro(0))
    End Sub

    Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Process.Start(OpePro(1))
    End Sub
End Class

[dglienna]

Something like this?

        For i = 0 To OpePro.Length - 1
          NPB = New Button
          NPB.Text = OpePro(i)
          NPB.Width = 75 i
          NPB.Height = 62 
          NPB.Left = posl + (posl * i)  ' some calcs
          NPB.Top = 0 +  (posl * i)     ' some more calcs
          Controls.Add(NPB)
          AddHandler NPB.Click, AddressOf Button2_Click
       Next

They could share the event handler

[957]

for this line

For i = 0 To OpePro.Length - 1

it says "object reference not set to an instance of an object"

[957]

how about an if statement?

[dglienna]

Make it PUBLIC instead of DIM

[957]

is this right?

Public Class Form1

    Dim OpePro As String
    Dim posl As Integer
    Dim NPB As Button
    Public i As Integer

    Private Sub Add_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Add.Click
        OpenFileDialog1.ShowDialog()
        OpePro = OpenFileDialog1.FileName
        posl = posl + 75

        For Me.i = 0 To OpePro.Length - 1
            NPB = New Button
            NPB.Text = OpePro(i)
            NPB.Width = 75
            NPB.Height = 62
            NPB.Left = posl
            NPB.Top = 0
            Controls.Add(NPB)
            AddHandler NPB.Click, AddressOf Button1_Click
        Next

    End Sub

    Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Process.Start(OpePro)
    End Sub

    Private Sub Task_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Task.Click
        System.Diagnostics.Process.Start("taskmgr.exe")
    End Sub

    Private Sub Calc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Calc.Click
        System.Diagnostics.Process.Start("calc.exe")
    End Sub
End Class

[957]

the second button overwrote the first one so I don't think that it's what you meant

[dglienna]

You need an ARRAY of buttons...

  Dim NPB(7) As Button

and a few (i)'s