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Docking pane error on loading
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dloring View Drop Down
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    Posted: 03 March 2007 at 5:05pm
Hi, I am new to this and I seem to be having a problem getting the docking pane set up. The code is below, but this always goes to the catch as soon as the code hits the paneA.Title with the error Object reference not set to an instance of an object. Does anyone have any idea what I am doing wrong?
 

Private arrPanes(1) As XtremeDockingPane.Pane

Private Sub FMain_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load

Try

Dim paneA As XtremeDockingPane.Pane = DockingPanelManager.CreatePane(1, 200, 120, DockingDirection.DockBottomOf, Nothing)

paneA.Title = "Supplier Totals"

Dim paneB As XtremeDockingPane.Pane = DockingPanelManager.CreatePane(2, 200, 120, DockingDirection.DockRightOf, paneA)

paneB.Title = "Controls"

'DockingPanelManager.LoadState("DA Software", "GCOrders", "DPLayout")

Catch ex As Exception

MsgBox("An error occured loading the Docking Panels: " & ex.Message, MsgBoxStyle.Information, gCST_AppTitle)

End Try

End Sub

Private Sub DockingPanelManager_AttachPaneEvent(ByVal sender As Object, ByVal e As AxXtremeDockingPane._DDockingPaneEvents_AttachPaneEvent) Handles DockingPanelManager.AttachPaneEvent

Dim nIndex As Integer = e.item.Id - 1

If arrPanes(nIndex) Is Nothing Then

Select Case nIndex

Case 0

arrPanes(nIndex) = New FPaneButtons

Case 1

arrPanes(nIndex) = New FPaneTotals

End Select

End If

e.item.Handle = arrPanes(nIndex).Handle

End Sub
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Points: 11234 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Oleg Quote  Post ReplyReply Direct Link To This Post Posted: 04 March 2007 at 4:09am
Hi,
Do you have same message with ActiveX\DockingPane\VB.NET\DockingPane  sample?
 
Please attach whole project to debug it
Oleg, Support Team
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Ohh, seems problem in arrPanes(nIndex)  line. You never get momory for arrPanes objects.
See our sample arrPanes in samples is array of child objects - not XtremeDockingPane.Pane
Oleg, Support Team
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Hi Oleg
 
I removbed the XtremeDockingPane.Pane from the declaration of arrPanes but I still get the same error message.
 
I have tried to make sure everything is as per the examples, but I can't get it to work.
 
Regards
David
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Hi Oleg,
 
I have zipped the project in case you want to have a look at it. It's 785 KB. Can I attach it in the forum, or can I email it to you?
 
Regards
David
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Hi Oleg,
 
If you need the SQL Server 2005 Express database it zips to 2 MB. Is this OK?
 
Regards
David
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Hi,
show me what you have in FMain_Load and DockingPanelManager_AttachPaneEvent now.
Oleg, Support Team
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Hi Oleg
 
Private Sub FMain_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load

Try

Me.SeasonsTableAdapter.Fill(Me.GCBTallyDataSet.Seasons)

Me.BuyingTypesTableAdapter.Fill(Me.GCBTallyDataSet.BuyingTypes)

'Open the connection for the form

cnnData.Open()

Try

Dim paneA As XtremeDockingPane.Pane = DockingPanelManager.CreatePane(1, 200, 120, DockingDirection.DockBottomOf, Nothing)

paneA.Title = "Supplier Totals"

Dim paneB As XtremeDockingPane.Pane = DockingPanelManager.CreatePane(2, 200, 120, DockingDirection.DockRightOf, paneA)

paneB.Title = "Controls"

'DockingPanelManager.LoadState("DA Software", "GCOrders", "DPLayout")

Catch ex As Exception

MsgBox("An error occured loading the Docking Panels: " & ex.Message, MsgBoxStyle.Information, gCST_AppTitle)

End Try

Catch ex As SqlClient.SqlException

MsgBox("The system has thrown an exception when opening the connection to the database." & vbCrLf & vbCrLf & ex.Message _

& "[" & ex.ErrorCode & "]", MsgBoxStyle.Exclamation, gCST_AppTitle)

Me.Close()

End Try

End Sub

Private Sub DockingPanelManager_AttachPaneEvent(ByVal sender As Object, ByVal e As AxXtremeDockingPane._DDockingPaneEvents_AttachPaneEvent) Handles DockingPanelManager.AttachPaneEvent

Dim nIndex As Integer = e.item.Id - 1

If arrPanes(nIndex) Is Nothing Then

Select Case nIndex

Case 0

arrPanes(nIndex) = New FPaneButtons

Case 1

arrPanes(nIndex) = New FPaneTotals

End Select

End If

e.item.Handle = arrPanes(nIndex).Handle

End Sub

I also tried it with:

Dim paneA = DockingPanelManager.CreatePane(1, 200, 120, DockingDirection.DockBottomOf, Nothing)

That did not wrok either
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Forgot to add:
 

Private arrPanes(1)

Changed the declaration
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try

Private arrPanes(2)

if will not help, attach whole project to debug.
Oleg, Support Team
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Hi Oleg,
 
How does one upload files?
 
David
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Hi Oleg
 
Immediately after passing through Dim paneA the 'Autos' look like this. Note the error!
 
Does this help?
 
-  DockingPanelManager {AxXtremeDockingPane.AxDockingPane} AxXtremeDockingPane.AxDockingPane
+  AccessibilityObject {System.Windows.Forms.Control.ControlAccessibleObject} System.Windows.Forms.AccessibleObject
  AccessibleDefaultActionDescription Nothing String
  AccessibleDescription Nothing String
  AccessibleName Nothing String
  AccessibleRole Default {-1} System.Windows.Forms.AccessibleRole
-  ActivePane {"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."} XtremeDockingPane.Pane
+  Data {System.Collections.ListDictionaryInternal} System.Collections.IDictionary
  HelpLink Nothing String
  InnerException Nothing System.Exception
  Message "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." String
  Source "mscorlib" String
  StackTrace "   at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData)
   at XtremeDockingPane._DDockingPane.get_ActivePane()
   at AxXtremeDockingPane.AxDockingPane.get_ActivePane()" String
+  TargetSite {System.Reflection.RuntimeMethodInfo} System.Reflection.MethodBase
  AllowDrop False Boolean
  Anchor 5 System.Windows.Forms.AnchorStyles
+  AutoScrollOffset {X = 0 Y = 0} System.Drawing.Point
  AutoSize False Boolean
+  BackColor "{Name=fffafdd2, ARGB=(255, 250, 253, 210)}" System.Drawing.Color
  BackgroundImage Nothing System.Drawing.Image
  BackgroundImageLayout Tile {1} System.Windows.Forms.ImageLayout
+  BindingContext {System.Windows.Forms.BindingContext} System.Windows.Forms.BindingContext
  Bottom 145 Integer
+  Bounds {X = 495 Y = 121 Width = 24 Height = 24} System.Drawing.Rectangle
  CanFocus False Boolean
  CanSelect False Boolean
  Capture False Boolean
  CausesValidation True Boolean
  CheckForIllegalCrossThreadCalls True Boolean
+  ClientRectangle {X = 0 Y = 0 Width = 24 Height = 24} System.Drawing.Rectangle
+  ClientSize {Width = 24 Height = 24} System.Drawing.Size
  CompanyName "AxXtremeDockingPane" String
  Container Nothing System.ComponentModel.IContainer
+  ContainingControl {GCOrders.FMain} System.Windows.Forms.ContainerControl
  ContainsFocus False Boolean
  ContextMenu Nothing System.Windows.Forms.ContextMenu
  ContextMenuStrip Nothing System.Windows.Forms.ContextMenuStrip
+  Controls {System.Windows.Forms.Control.ControlCollection} System.Windows.Forms.Control.ControlCollection
  Created False Boolean
+  Cursor {System.Windows.Forms.Cursor} System.Windows.Forms.Cursor
+  DataBindings {System.Windows.Forms.ControlBindingsCollection} System.Windows.Forms.ControlBindingsCollection
+  DefaultBackColor "{Name=Control, ARGB=(255, 236, 233, 216)}" System.Drawing.Color
+  DefaultFont {Name = "Microsoft Sans Serif" Size=8.25} System.Drawing.Font
+  DefaultForeColor "{Name=ControlText, ARGB=(255, 0, 0, 0)}" System.Drawing.Color
+  DisplayRectangle {X = 0 Y = 0 Width = 24 Height = 24} System.Drawing.Rectangle
  Disposing False Boolean
  Dock None {0} System.Windows.Forms.DockStyle
  EditMode False Boolean
  Enabled True Boolean
  Focused False Boolean
+  Font {Name = "Arial" Size=9.75} System.Drawing.Font
+  ForeColor "{Name=ControlText, ARGB=(255, 0, 0, 0)}" System.Drawing.Color
  Handle 395318 System.IntPtr
  HasAboutBox True Boolean
  HasChildren False Boolean
  Height 24 Integer
  Icons Nothing XtremeDockingPane.ImageManagerIcons
  ImageList Nothing Object
  ImeMode NoControl {0} System.Windows.Forms.ImeMode
  InvokeRequired False Boolean
  IsAccessible False Boolean
  IsDisposed False Boolean
  IsHandleCreated True Boolean
  IsMirrored False Boolean
+  LayoutEngine {System.Windows.Forms.Layout.DefaultLayout} System.Windows.Forms.Layout.LayoutEngine
  Left 495 Integer
+  Location {X = 495 Y = 121} System.Drawing.Point
+  Margin {System.Windows.Forms.Padding} System.Windows.Forms.Padding
+  MaximumSize {Width = 0 Height = 0} System.Drawing.Size
+  MinimumSize {Width = 0 Height = 0} System.Drawing.Size
  ModifierKeys None {0} System.Windows.Forms.Keys
  MouseButtons None {0} System.Windows.Forms.MouseButtons
+  MousePosition {X = 1121 Y = 534} System.Drawing.Point
  Name "DockingPanelManager" String
+  OcxState {System.Windows.Forms.AxHost.State} System.Windows.Forms.AxHost.State
+  Options {System.__ComObject} XtremeDockingPane.DockingPaneOptions
+  Padding {System.Windows.Forms.Padding} System.Windows.Forms.Padding
+  PaintManager {"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."} XtremeDockingPane.DockingPanePaintManager
+  PanelPaintManager {"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."} XtremeDockingPane.TabPaintManager
  Panes In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. XtremeDockingPane.Pane
  PanesCount 0 Integer
+  Parent {System.Windows.Forms.Panel} System.Windows.Forms.Control
+  PreferredSize {Width = 24 Height = 24} System.Drawing.Size
  ProductName "AxXtremeDockingPane" String
  ProductVersion "10.2.0.0" String
  RecreatingHandle False Boolean
  Region Nothing System.Drawing.Region
  Right 519 Integer
  RightToLeft No {0} System.Windows.Forms.RightToLeft
  ScaleMode xtpScaleAuto {0} XtremeDockingPane.XTPScaleMode
  Site Nothing System.ComponentModel.ISite
+  Size {Width = 24 Height = 24} System.Drawing.Size
  TabIndex 24 Integer
+  TabPaintManager {"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."} XtremeDockingPane.TabPaintManager
  TabStop True Boolean
  Tag Nothing Object
  Text "" String
  ToolTipContext Nothing XtremeDockingPane.ToolTipContext
  Top 121 Integer
+  TopLevelControl {GCOrders.FMDIMain} System.Windows.Forms.Control
  UseWaitCursor False Boolean
  Visible False Boolean
  VisualTheme ThemeOffice {1} XtremeDockingPane.VisualTheme
  Width 24 Integer
+  WindowTarget {System.Windows.Forms.Control.ControlNativeWindow} System.Windows.Forms.IWindowTarget
+  cnnData {System.Data.SqlClient.SqlConnection} System.Data.SqlClient.SqlConnection
  paneA Nothing XtremeDockingPane.Pane
  paneB Nothing XtremeDockingPane.Pane
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Points: 11234 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Oleg Quote  Post ReplyReply Direct Link To This Post Posted: 12 March 2007 at 2:14am
Hi,
Send project to support@codejock.com
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS
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