VB .NET Multiple Forms PictureBox change problem


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Thread: VB .NET Multiple Forms PictureBox change problem

  1. #1
    Join Date
    Aug 2005
    Location
    Illinois
    Posts
    1

    VB .NET Multiple Forms PictureBox change problem

    Hello everyone,
    This is my first post here, so try to go easy on me. I tried searching these forums and the internet for days to no avail. Let me just first say that I'm a newbie to VB .NET.

    Ok, here's what I'm trying to do. I have a VB .NET program with two forms. I want to have three buttons on the first form. Button1 loads and displays the second form. Button 2 makes a PictureBox on Form2 'visible'. Button3 on the first form makes the same PictureBox on Form2 'not visible'.

    I am close to figuring out how to do this. I make a class called myFormLibrary that declares the two forms. I can modify and change elements in each form - things like properties for each specific form (ie, Show, hide, etc...)

    I made a Public Sub in Form2 that has the code in it to make the PictureBox viewable. I can successfully call the sub from within Form1, but nothing happens when I tell it to make the PictureBox viewable.


    Code within button click on Form1:
    Code:
    Dim Form2 As New Form2
    
    Form2.lockDoors()
    Code within lockDoors Sub in Form2:
    Code:
    PictureBoxLocked1.Visible = True
    MsgBox("Test to see if we made it in here")
    The MessageBox pops up, but the image doesn't appear. Oh, I forgot to mention that when I loaded Form2 I had it make the PictureBox.Visible = False

    This seems like something very simple, but I'm lost. I tried 10 ways to change the state of the PictureBox. What am I doing wrong? If there's any further info anyone needs to know to helpme further, please let me know.

  2. #2
    Join Date
    Nov 2003
    Location
    Portland, OR
    Posts
    8,387
    If you declare the Form2 instance inside Form1's Button1_Click event, it's not visible from the Button2- and Button3_Click events. You should declare the Form2 reference at the class level of Form1 (that is, outside any Sub or Function). Your code should look like this:
    Code:
    Option Explicit On 
    Public Class Form1
        Inherits System.Windows.Forms.Form
    
        ' Class-level reference to Form2
        Dim theForm2 As Form2
    
        Private Sub Button1_Click(ByVal sender As System.Object, _ 
            ByVal e As System.EventArgs) Handles Button1.Click
            ' Create and show new instance of Form2
            theForm2 = New Form2
            theForm2.Show()
        End Sub
    
        Private Sub Button2_Click(ByVal sender As System.Object, _ 
            ByVal e As System.EventArgs) Handles Button2.Click
            ' Show PictureBox on theForm2
            theForm2.LockDoors(True)
        End Sub
    
        Private Sub Button3_Click(ByVal sender As System.Object, _ 
            ByVal e As System.EventArgs) Handles Button3.Click
            ' Hide PictureBox on theForm2
            theForm2.LockDoors(False)
        End Sub
    End Class
    
    Option Explicit On 
    Public Class Form2
        Inherits System.Windows.Forms.Form
    
        Public Sub LockDoors(ByVal Show As Boolean)
            PictureBoxLocked1.Visible = Show
        End Sub
    End Class
    Phil Weber
    http://www.philweber.com

    Please post questions to the forums, where others may benefit.
    I do not offer free assistance by e-mail. Thank you!

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