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 1 2092
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
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