Printing a list box - .NET Framework

NickB

Please could someone tell me what is wrong.
Ther error is:
An unhandled exception of type 'System.NullRef erenceException ' occurred in
microsoft.visua lbasic.dll

Additional information: Object variable or With block variable not set.

I am trying to print the contents of a list box on another form.

This is the sub, and the highlighted line is where it is falling over.
Private Sub PrintDoco_Print Page(ByVal sender As System.Object, ByVal e
As System.Drawing. Printing.PrintP ageEventArgs) Handles PrintDoco.Print Page

'm_CurrentPage += 1

Dim max As Integer
Dim n As Integer
max = lstData.count *************** *************** ***********
MsgBox(max, , "Test")
For n = 0 To max - 1
e.Graphics.Draw String(lstData. item.count(), New Font("arial",
12, FontStyle.Regul ar), Brushes.Black, 200, 200 + n * 45)
Next

e.HasMorePages = False

End Sub

This is the code for both forms :

Imports System.Manageme nt
Imports System.Drawing. Printing
Imports System
Imports System.Drawing. Drawing2D
Imports System.Windows. Forms
Imports System.Drawing

Public Class Print
Inherits System.Windows. Forms.Form
#Region " Windows Form Designer generated code "
#End Region
Private WithEvents PrintDoco As New PrintDocument
Private m_CurrentPage As Integer

Private Sub Print_Load(ByVa l sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load

With Me.cboPrinters
For Each s As String In PrinterSettings .InstalledPrint ers
.Items.Add(s)
Next s
If .Items.Count > 0 Then
.SelectedIndex = 0
Else
MessageBox.Show ("No printers installed, quitting!",
Application.Pro ductName, MessageBoxButto ns.OK, MessageBoxIcon. Exclamation)
Me.Close()
End If
End With
'PrintDoco.Docu mentName = "Unknown"

AddHandler PrintDoco.Print Page, AddressOf PrintDoco_Print Page
m_CurrentPage = 0
End Sub

Private Sub cboPrinters_Sel ectedIndexChang ed(ByVal sender As
System.Object, ByVal e As System.EventArg s) Handles
cboPrinters.Sel ectedIndexChang ed
If Me.cboPrinters. SelectedIndex <> -1 Then
PrintDoco.Print erSettings.Prin terName = Me.cboPrinters. Text
End If
End Sub

Private Sub PrintDoco_Print Page(ByVal sender As System.Object, ByVal e
As System.Drawing. Printing.PrintP ageEventArgs) Handles PrintDoco.Print Page

'm_CurrentPage += 1

Dim max As Integer
Dim n As Integer
max = lstData.count
MsgBox(max, , "Test")
For n = 0 To max - 1
e.Graphics.Draw String(lstData. item.count(), New Font("arial",
12, FontStyle.Regul ar), Brushes.Black, 200, 200 + n * 45)
Next

e.HasMorePages = False

End Sub

Private Sub btnPrint_Click( ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles btnPrint.Click

PrintDoco.Print ()
'lstData.Focus( )
'lstData.Select All()
'lstData.Show()
Me.Close()
End Sub

Private Sub btnPreview_Clic k(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles btnPreview.Clic k
MsgBox("Into preview")
m_CurrentPage = 0
Dim ppdlg As ExtendedPrintPr eviewDialog

With (ppdlg)
.Document = PrintDoco
.WindowState = FormWindowState .Maximized
.ShowDialog()
.Dispose()
End With
MsgBox("Out of Preview")
End Sub

Private Sub btnPrinterSetti ngs_Click(ByVal sender As System.Object,
ByVal e As System.EventArg s) Handles btnPrinterSetti ngs.Click

Dim pdlg As New PrintDialog
With pdlg
.Document = PrintDoco
.PrinterSetting s = PrintDoco.Print erSettings
.AllowPrintToFi le = False
If .ShowDialog() = DialogResult.OK Then
SelectPrinter(c boPrinters, .PrinterSetting s.PrinterName)
End If
.Dispose()
End With
End Sub

Private Sub btnPageSetup_Cl ick(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles btnPageSetup.Cl ick

Dim psdlg As New PageSetupDialog
With psdlg
.PrinterSetting s = PrintDoco.Print erSettings
.PageSettings = PrintDoco.Defau ltPageSettings
If .ShowDialog() = DialogResult.OK Then
.PageSettings.M argins =
PrinterUnitConv ert.Convert(.Pa geSettings.Marg ins,
PrinterUnit.Tho usandthsOfAnInc h, PrinterUnit.Hun dredthsOfAMilli meter)
SelectPrinter(c boPrinters, .PrinterSetting s.PrinterName)
End If
.Dispose()
End With
End Sub
'Public Shared Sub Main()
' Application.Ena bleVisualStyles ()
' Application.DoE vents()
' Application.Run (New Print)
'End Sub
Private Sub SelectPrinter(B yVal ComboBox As ComboBox, ByVal PrinterName
As String)
For i As Integer = 0 To ComboBox.Items. Count - 1
If ComboBox.Items( i).ToString() = PrinterName Then
ComboBox.Select edIndex = i
Exit For
End If
Next i
End Sub

End Class
Module Module1
Public lstData
Public PrintDoco
End Module

Public Class frmSystemInform ation
Inherits System.Windows. Forms.Form

#Region " Windows Form Designer generated code "

#End Region
Private PrintDoco As New PrintDocument

Private m_CurrentPage As Integer
Public frmPrint As Form

Private Sub cmdOperatingSys tem_Click(ByVal sender As System.Object,
ByVal e As System.EventArg s) Handles cmdOperatingSys tem.Click

Dim sClassname As String = "Win32_Operatin gSystem"
lstData.Items.C lear()
'grab the class
Dim oServices As New System.Manageme nt.ManagementCl ass(sClassname)
Dim oService As System.Manageme nt.ManagementOb ject
'loop through the instances
For Each oService In oServices.GetIn stances
'Add to the list box
lstData.Items.A dd(oService("Na me"))
lstData.Items.A dd(oService("Ma nufacturer"))
lstData.Items.A dd(oService("Ve rsion"))
lstData.Items.A dd(oService("CS DVersion"))
Next
End Sub

Private Sub cmdNetwork_Clic k(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdNetwork.Clic k
Dim mc As System.Manageme nt.ManagementCl ass
Dim objWMI As ManagementObjec t
mc = New ManagementClass ("Win32_Network AdapterConfigur ation")
lstData.Items.C lear()
Dim moc As ManagementObjec tCollection = mc.GetInstances ()
For Each objWMI In moc
If objWMI.Item("IP Enabled") = True Then
lstData.Items.A dd("MAC address is: " &
objWMI.Item("Ma cAddress").ToSt ring())
lstData.Items.A dd(objWMI("DNSH ostName"))
'lstData.Items. Add(objWMI("DNS Domain"))
lstData.Items.A dd(objWMI.Item( "MACAddress "))
lstData.Items.A dd(objWMI("Desc ription"))
End If
Next
End Sub

Private Sub cmdBIOS_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdBIOS.Click
Dim sClassname As String = "Win32_BIOS "
lstData.Items.C lear()
'grab the class
Dim objWMISet As New System.Manageme nt.ManagementCl ass(sClassname)
Dim objWMI As System.Manageme nt.ManagementOb ject
'loop through the instances
For Each objWMI In objWMISet.GetIn stances
'Add to the list box
lstData.Items.A dd(String.Forma t("{0}:{1}", "Name",
objWMI("Name")) )
lstData.Items.A dd(String.Forma t("{0}:{1}", "Manufactur er",
objWMI("Manufac turer")))
lstData.Items.A dd(String.Forma t("{0}:{1}", "Version",
objWMI("Version ")))
lstData.Items.A dd(String.Forma t("{0}:{1}", "Serial Number",
objWMI("SerialN umber")))

Next
End Sub

Private Sub cmdProcessor_Cl ick(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdProcessor.Cl ick
Dim sClassname As String = "Win32_Processo r"
lstData.Items.C lear()
'grab the class
Dim objWMISet As New System.Manageme nt.ManagementCl ass(sClassname)
Dim objWMI As System.Manageme nt.ManagementOb ject
'loop through the instances
For Each objWMI In objWMISet.GetIn stances
'Add to the list box
lstData.Items.A dd(String.Forma t("{0}:{1}", "Name",
objWMI("Name")) )
lstData.Items.A dd(String.Forma t("{0}:{1}", "Manufactur er",
objWMI("Manufac turer")))
lstData.Items.A dd(String.Forma t("{0}:{1}", "Maximum Clock
Speed", objWMI("MaxCloc kSpeed")))
Next
End Sub

Private Sub cmdDisks_Click( ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdDisks.Click
Dim sClassname As String = "Win32_LogicalD isk"
lstData.Items.C lear()
'grab the class
Dim objWMISet As New System.Manageme nt.ManagementCl ass(sClassname)
Dim objWMI As System.Manageme nt.ManagementOb ject
'loop through the instances
For Each objWMI In objWMISet.GetIn stances
'Add to the list box
lstData.Items.A dd(String.Forma t("{0}:{1}", "Name",
objWMI("Name")) )
lstData.Items.A dd(String.Forma t("{0}:{1}", "Size",
objWMI("Size")) )
lstData.Items.A dd(String.Forma t("{0}:{1}", "Free Space",
objWMI("FreeSpa ce")))
Next
End Sub

Private Sub cmdPrint_Click( ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdPrint.Click
Dim frmPrint As New Print

frmPrint.Show()
End Sub

End Class
Thanks

Jul 21 '05 #1

Subscribe Reply

2089

Cor Ligthert

Nick,

I think that when you want some help, you should first make a more simple
sample. This code you show now you can test, we miss all input, therefore
helping you is in my opinion almost impossible or there should be somebody
who has a lucky hit and than still it will be guessing in my opinion.

Probably by the way when you make that simple sample, you find the error
yourself.

Sorry could not give any help more,

Cor
"NickB" <Ni***@discussi ons.microsoft.c om>

Please could someone tell me what is wrong.
Ther error is:
An unhandled exception of type 'System.NullRef erenceException ' occurred in
microsoft.visua lbasic.dll

Additional information: Object variable or With block variable not set.

I am trying to print the contents of a list box on another form.

This is the sub, and the highlighted line is where it is falling over.
Private Sub PrintDoco_Print Page(ByVal sender As System.Object, ByVal e
As System.Drawing. Printing.PrintP ageEventArgs) Handles PrintDoco.Print Page

'm_CurrentPage += 1

Dim max As Integer
Dim n As Integer
max = lstData.count *************** *************** ***********
MsgBox(max, , "Test")
For n = 0 To max - 1
e.Graphics.Draw String(lstData. item.count(), New Font("arial",
12, FontStyle.Regul ar), Brushes.Black, 200, 200 + n * 45)
Next

e.HasMorePages = False

End Sub

This is the code for both forms :

Imports System.Manageme nt
Imports System.Drawing. Printing
Imports System
Imports System.Drawing. Drawing2D
Imports System.Windows. Forms
Imports System.Drawing

Public Class Print
Inherits System.Windows. Forms.Form
#Region " Windows Form Designer generated code "
#End Region
Private WithEvents PrintDoco As New PrintDocument
Private m_CurrentPage As Integer

Private Sub Print_Load(ByVa l sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load

With Me.cboPrinters
For Each s As String In PrinterSettings .InstalledPrint ers
.Items.Add(s)
Next s
If .Items.Count > 0 Then
.SelectedIndex = 0
Else
MessageBox.Show ("No printers installed, quitting!",
Application.Pro ductName, MessageBoxButto ns.OK, MessageBoxIcon. Exclamation)
Me.Close()
End If
End With
'PrintDoco.Docu mentName = "Unknown"

AddHandler PrintDoco.Print Page, AddressOf PrintDoco_Print Page
m_CurrentPage = 0
End Sub

Private Sub cboPrinters_Sel ectedIndexChang ed(ByVal sender As
System.Object, ByVal e As System.EventArg s) Handles
cboPrinters.Sel ectedIndexChang ed
If Me.cboPrinters. SelectedIndex <> -1 Then
PrintDoco.Print erSettings.Prin terName = Me.cboPrinters. Text
End If
End Sub

Private Sub PrintDoco_Print Page(ByVal sender As System.Object, ByVal e
As System.Drawing. Printing.PrintP ageEventArgs) Handles PrintDoco.Print Page

'm_CurrentPage += 1

Dim max As Integer
Dim n As Integer
max = lstData.count
MsgBox(max, , "Test")
For n = 0 To max - 1
e.Graphics.Draw String(lstData. item.count(), New Font("arial",
12, FontStyle.Regul ar), Brushes.Black, 200, 200 + n * 45)
Next

e.HasMorePages = False

End Sub

Private Sub btnPrint_Click( ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles btnPrint.Click

PrintDoco.Print ()
'lstData.Focus( )
'lstData.Select All()
'lstData.Show()
Me.Close()
End Sub

Private Sub btnPreview_Clic k(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles btnPreview.Clic k
MsgBox("Into preview")
m_CurrentPage = 0
Dim ppdlg As ExtendedPrintPr eviewDialog

With (ppdlg)
.Document = PrintDoco
.WindowState = FormWindowState .Maximized
.ShowDialog()
.Dispose()
End With
MsgBox("Out of Preview")
End Sub

Private Sub btnPrinterSetti ngs_Click(ByVal sender As System.Object,
ByVal e As System.EventArg s) Handles btnPrinterSetti ngs.Click

Dim pdlg As New PrintDialog
With pdlg
.Document = PrintDoco
.PrinterSetting s = PrintDoco.Print erSettings
.AllowPrintToFi le = False
If .ShowDialog() = DialogResult.OK Then
SelectPrinter(c boPrinters, .PrinterSetting s.PrinterName)
End If
.Dispose()
End With
End Sub

Private Sub btnPageSetup_Cl ick(ByVal sender As System.Object, ByVal e
As
System.EventArg s) Handles btnPageSetup.Cl ick

Dim psdlg As New PageSetupDialog
With psdlg
.PrinterSetting s = PrintDoco.Print erSettings
.PageSettings = PrintDoco.Defau ltPageSettings
If .ShowDialog() = DialogResult.OK Then
.PageSettings.M argins =
PrinterUnitConv ert.Convert(.Pa geSettings.Marg ins,
PrinterUnit.Tho usandthsOfAnInc h, PrinterUnit.Hun dredthsOfAMilli meter)
SelectPrinter(c boPrinters, .PrinterSetting s.PrinterName)
End If
.Dispose()
End With
End Sub
'Public Shared Sub Main()
' Application.Ena bleVisualStyles ()
' Application.DoE vents()
' Application.Run (New Print)
'End Sub
Private Sub SelectPrinter(B yVal ComboBox As ComboBox, ByVal PrinterName
As String)
For i As Integer = 0 To ComboBox.Items. Count - 1
If ComboBox.Items( i).ToString() = PrinterName Then
ComboBox.Select edIndex = i
Exit For
End If
Next i
End Sub

End Class
Module Module1
Public lstData
Public PrintDoco
End Module

Public Class frmSystemInform ation
Inherits System.Windows. Forms.Form

#Region " Windows Form Designer generated code "

#End Region
Private PrintDoco As New PrintDocument

Private m_CurrentPage As Integer
Public frmPrint As Form

Private Sub cmdOperatingSys tem_Click(ByVal sender As System.Object,
ByVal e As System.EventArg s) Handles cmdOperatingSys tem.Click

Dim sClassname As String = "Win32_Operatin gSystem"
lstData.Items.C lear()
'grab the class
Dim oServices As New System.Manageme nt.ManagementCl ass(sClassname)
Dim oService As System.Manageme nt.ManagementOb ject
'loop through the instances
For Each oService In oServices.GetIn stances
'Add to the list box
lstData.Items.A dd(oService("Na me"))
lstData.Items.A dd(oService("Ma nufacturer"))
lstData.Items.A dd(oService("Ve rsion"))
lstData.Items.A dd(oService("CS DVersion"))
Next
End Sub

Private Sub cmdNetwork_Clic k(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdNetwork.Clic k
Dim mc As System.Manageme nt.ManagementCl ass
Dim objWMI As ManagementObjec t
mc = New ManagementClass ("Win32_Network AdapterConfigur ation")
lstData.Items.C lear()
Dim moc As ManagementObjec tCollection = mc.GetInstances ()
For Each objWMI In moc
If objWMI.Item("IP Enabled") = True Then
lstData.Items.A dd("MAC address is: " &
objWMI.Item("Ma cAddress").ToSt ring())
lstData.Items.A dd(objWMI("DNSH ostName"))
'lstData.Items. Add(objWMI("DNS Domain"))
lstData.Items.A dd(objWMI.Item( "MACAddress "))
lstData.Items.A dd(objWMI("Desc ription"))
End If
Next
End Sub

Private Sub cmdBIOS_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdBIOS.Click
Dim sClassname As String = "Win32_BIOS "
lstData.Items.C lear()
'grab the class
Dim objWMISet As New System.Manageme nt.ManagementCl ass(sClassname)
Dim objWMI As System.Manageme nt.ManagementOb ject
'loop through the instances
For Each objWMI In objWMISet.GetIn stances
'Add to the list box
lstData.Items.A dd(String.Forma t("{0}:{1}", "Name",
objWMI("Name")) )
lstData.Items.A dd(String.Forma t("{0}:{1}", "Manufactur er",
objWMI("Manufac turer")))
lstData.Items.A dd(String.Forma t("{0}:{1}", "Version",
objWMI("Version ")))
lstData.Items.A dd(String.Forma t("{0}:{1}", "Serial Number",
objWMI("SerialN umber")))

Next
End Sub

Private Sub cmdProcessor_Cl ick(ByVal sender As System.Object, ByVal e
As
System.EventArg s) Handles cmdProcessor.Cl ick
Dim sClassname As String = "Win32_Processo r"
lstData.Items.C lear()
'grab the class
Dim objWMISet As New System.Manageme nt.ManagementCl ass(sClassname)
Dim objWMI As System.Manageme nt.ManagementOb ject
'loop through the instances
For Each objWMI In objWMISet.GetIn stances
'Add to the list box
lstData.Items.A dd(String.Forma t("{0}:{1}", "Name",
objWMI("Name")) )
lstData.Items.A dd(String.Forma t("{0}:{1}", "Manufactur er",
objWMI("Manufac turer")))
lstData.Items.A dd(String.Forma t("{0}:{1}", "Maximum Clock
Speed", objWMI("MaxCloc kSpeed")))
Next
End Sub

Private Sub cmdDisks_Click( ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdDisks.Click
Dim sClassname As String = "Win32_LogicalD isk"
lstData.Items.C lear()
'grab the class
Dim objWMISet As New System.Manageme nt.ManagementCl ass(sClassname)
Dim objWMI As System.Manageme nt.ManagementOb ject
'loop through the instances
For Each objWMI In objWMISet.GetIn stances
'Add to the list box
lstData.Items.A dd(String.Forma t("{0}:{1}", "Name",
objWMI("Name")) )
lstData.Items.A dd(String.Forma t("{0}:{1}", "Size",
objWMI("Size")) )
lstData.Items.A dd(String.Forma t("{0}:{1}", "Free Space",
objWMI("FreeSpa ce")))
Next
End Sub

Private Sub cmdPrint_Click( ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles cmdPrint.Click
Dim frmPrint As New Print

frmPrint.Show()
End Sub

End Class
Thanks

Jul 21 '05 #2

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In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

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