TreeView Crash

[VILANOR]

Hi

I found this problem on the KryptonTreeView, I'm not sure about how to reproduce the problem but it happens suddenly.
On method :
protected override void WndProc(ref Message m)

There is a switch: switch (m.Msg) with some cases, but there is no case when m.Msg it's equal to 8270, so the switch jumps to the case by default, which provokes a NullReferenceException on this line : base.WndProc(ref m);

Displaying the error message: "Object reference not set to an instance of an object."
Any idea about how to fix the issue ?
Maybe just a try catch on default case, or something special needs to be done when the message it's 8270?

Thanks.

KryptonTreeviewCrash.JPG (118.05 KiB) Viewed 596 times

[Pau]

I get a similar crash.

It occurs on closing the application. It only occurs in "release mode" (not in debugging, or from Visual Studio). It occurs always.

System.NullReferenceException: Object reference not set to an instance of an object..
en ComponentFactory.Krypton.Toolkit.PaletteRedirect.GetContentDraw(PaletteContentStyle style, PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContentInheritRedirect.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContent.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContent.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContentInheritOverride.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContentInheritNode.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.ViewDrawContent.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.ViewLayoutDocker.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.ViewComposite.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.ViewDrawSplitCanvas.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.ViewDrawButton.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.KryptonTreeView.UpdateItemHeight()
en ComponentFactory.Krypton.Toolkit.KryptonTreeView.OnNeedPaint(Object sender, NeedLayoutEventArgs e)
en ComponentFactory.Krypton.Toolkit.VisualControlBase.PerformNeedPaint(Boolean needLayout)
en ComponentFactory.Krypton.Toolkit.KryptonTreeView.OnTreeViewLostFocus(Object sender, EventArgs e)
en System.Windows.Forms.Control.OnLostFocus(EventArgs e)
en System.Windows.Forms.Control.WmKillFocus(Message& m)
en System.Windows.Forms.Control.WndProc(Message& m)
en System.Windows.Forms.TreeView.WndProc(Message& m)
en ComponentFactory.Krypton.Toolkit.KryptonTreeView.InternalTreeView.WndProc(Message& m)
en System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
en System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
en System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)



As you can see, it also occurs in WndProc (I don't know if that is relevant).

Any help is appreciated.

[Pau]

On more thing: I just replaced all TreeView in my application with KryptonTreeView.

Obviously, the bug did not occur before replacement.

[VILANOR]

What I did was put a "try catch" just where the error appeared, in the case by default of the switch inside the method WndProc of KrptonTreeView class.
It did not crash again since I put the "try catch".

Also.. I had to do the same for KryptonListBox class in the same method.. I wonder if I will need to put a "try catch" for each control.

[Pau]

Hello again,

In my case, the problem was in my code.

I could reproduce the bug in a very simple project with this code:


Private Sub Form1_FormClosed(sender As Object, e As FormClosedEventArgs) Handles Me.FormClosed
Me.KryptonTreeView1.Dispose()
End Sub

And the excepcion raise while closing the main form...

System.NullReferenceException: Object reference not set to an instance of an object..
en ComponentFactory.Krypton.Toolkit.PaletteRedirect.GetContentDraw(PaletteContentStyle style, PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContentInheritRedirect.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContent.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContent.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContentInheritOverride.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.PaletteContentInheritNode.GetContentDraw(PaletteState state)
en ComponentFactory.Krypton.Toolkit.ViewDrawContent.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.ViewLayoutDocker.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.ViewComposite.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.ViewDrawSplitCanvas.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.ViewDrawButton.GetPreferredSize(ViewLayoutContext context)
en ComponentFactory.Krypton.Toolkit.KryptonTreeView.UpdateItemHeight()
en ComponentFactory.Krypton.Toolkit.KryptonTreeView.OnNeedPaint(Object sender, NeedLayoutEventArgs e)
en ComponentFactory.Krypton.Toolkit.VisualControlBase.PerformNeedPaint(Boolean needLayout)
en ComponentFactory.Krypton.Toolkit.KryptonTreeView.OnTreeViewLostFocus(Object sender, EventArgs e)
en System.Windows.Forms.Control.OnLostFocus(EventArgs e)
en System.Windows.Forms.Control.WmKillFocus(Message& m)
en System.Windows.Forms.Control.WndProc(Message& m)
en System.Windows.Forms.TreeView.WndProc(Message& m)
en ComponentFactory.Krypton.Toolkit.KryptonTreeView.InternalTreeView.WndProc(Message& m)
en System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
en System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
en System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


My fault. (but that did not occur with regular TreeView)

[Cocotteseb]

If you have sources in KryptonTreeView.cs, just surround what's inside the method UpdateItemHeight with a

Code: Select all

if (!IsDisposed && !Disposing)