Listbox text stored as decimal variable

Hi,

I am sorry ahead of time for being a first time poster and posing what might be an obviously simple question. I googled and youtubed my brains out first.

In my program I want to:

Have a listbox that says: 10 gauge , 8 gauge, 6 Gauge, etc
When a user selects "10 Gauge"
I want to assign the value .000129 to it and display it in a label (or textbox)
I ALSO want to use the value .000129 in a calculation.

So basically (ListItem = "10 Gauge" = .000129)

Does that make sense? Should I just elaborate on the whole program?

Thank you very much for your time.

My previous program incorporated radio buttons nexts to labels and I gave the value to the radio button, however I have MANY more wire sizes I would like to add and it looks silly with all the buttons.

You could use the ItemData property. However it can only accept a Long Integer value so you'd need to scale up the value and then reverse when using it

Code:

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Private Sub Form_Load()
List.AddItem "10 Gauge"
List.ItemData(List.NewIndex) = 1290
List.AddItem "8 Gague"
List.ItemData(List.NewIndex) = 641
List.AddItem "6 Gague"
List.ItemData(List.NewIndex) = 403
End Sub

Private Sub List_Click()
Dim sngOPF As Single
Text1.Text = List.ItemData(List.ListIndex) / 10000000
sngOPF = CSng(Text1.Text)
End Sub

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In the example above I've used 10 Gague = 0.000129, 8 Gague = 0.0000641 and 6 Gague = 0.0000403.

If you know the smallest possible value then you can select a multiplier to siut.

is this what you want

Code:

---

Private Sub List1_Click()
Select Case List1.List(List1.ListIndex)

  Case "10 Gauge"
      Text1 = "0.000129"
     
  Case "8 Gauge"
      Text1 = "8 Gauge"
     
  Case "6 Gauge"
      Text1 = "6 Gauge"
     
  Case "4 Gauge"
      Text1 = "4 Gauge"
End Select

'OR if you know which item is what you can do it like this

'Select Case List1.ListIndex
'  Case 0
'      Text1 = "0.000129"
'  Case 1
'      Text1 = "8 Gauge"
'  Case 2
'      Text1 = "6 Gauge"
'  Case 3
'      Text1 = "4 Gauge"
'End Select

End Sub

---

I think that will do it. I will give that a try.

Thank you for helping me Doogle.

Any more ideas are welcome. Im working on it currently.


Max, yes that is basically what I want to do.

Another method might be to hold a 'shadow' array of values representing the Gauge.

Code:

---

Private sngOPF(2) As Single

Private Sub Form_Load()
List.AddItem "10 Gauge"
sngOPF(List.NewIndex) = 0.000129
List.AddItem "8 Gague"
sngOPF(List.NewIndex) = 0.0000641
List.AddItem "6 Gague"
sngOPF(List.NewIndex) = 0.0000403
End Sub

Private Sub List_Click()
Text1.Text = sngOPF(List.ListIndex)
End Sub

---

Basically, (if youll mind the pun)


I have a program that takes a users input (#Inverters and Length of run) then provides the Voltage rise in the wire for a selected wire gauge.

I want them to select through the wires to find which wire fits their tolerance.

I have done it many times in excel and using only 4 wires as a choice and radio buttons.

The list is MUCH longer now and I want them to pick from a long "list" of wire gauges. When they select the wires gauge, they select the resistance/foot each of the wires have. I would want the program to display the resistance they have chosen and then take that number do some back ground math and produce a value that they will know how to work with.


This is my last program.

http://sphotos-b.xx.fbcdn.net/hphoto...75066222_n.jpg

I have tried a number of things to take this listbox work and now I am even more confused.

From the screenshot it seems you are using vb.net?

Its Visual Basic 2008 Express Edition

Quote:

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Originally Posted by station2station

Its Visual Basic 2008 Express Edition

---

I have moved the thread from Visual Basic 6 and Earlier to Visual Basic .NET where you will get appropriate responses :)

This is my current work in progress.

I'm just a beginner in VB2008 so this may be far more complicated than necessary but may give you a start and also encourage others with more knowledge than me to come up with something 'better'.

Code:

---

Public Class Form1
    Private Structure Wires
        Public Guage As String
        Public OpFt As Single
    End Structure

    Private myWires(2) As Wires
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        myWires(0).Guage = "10 Guage"
        myWires(0).OpFt = 0.000129
        myWires(1).Guage = "8 Guage"
        myWires(1).OpFt = 0.0000641
        myWires(2).Guage = "6 Guage"
        myWires(2).OpFt = 0.0000403
        ListBox1.Items.Add(myWires(0).Guage)
        ListBox1.Items.Add(myWires(1).Guage)
        ListBox1.Items.Add(myWires(2).Guage)

    End Sub

    Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
        Debug.Print(myWires(ListBox1.SelectedIndex).OpFt)
    End Sub
End Class

---

It's basically an 'extension' of my earlier suggestion of 'shadowing' with an array. Select an Item and the Resistance will be displayed in the Immediate Window.

Maybe something like this would work.

Code:

---

    Private Sub wire_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim dtWires As New DataTable

        With dtWires.Columns
            .Add("Display", GetType(String))
            .Add("Value", GetType(Decimal))
        End With

        dtWires.Rows.Add("10 Guage", 0.000129)
        dtWires.Rows.Add("8 Guage", 0.0000641)
        dtWires.Rows.Add("6 Guage", 0.0000403)

        ListBox1.DisplayMember = "Display"
        ListBox1.ValueMember = "Value"
        ListBox1.DataSource = dtWires


    End Sub

    Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
        Dim strDisplay As String = ListBox1.Text
        Dim decValue As Decimal = ListBox1.SelectedValue

        MsgBox(strDisplay & " - " & decValue.ToString)
    End Sub

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