Random Crash in my .NET Program

Renzska

I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song completes
I set the selected item in the listbox. I am assuming that is has to do with
the listbox because of this line:

"at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)"

and the listbox is the only part of my program that has a scrollable control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullRefe renceException: Object reference not set to an instance of an
object.

at System.Windows. Forms.UnsafeNat iveMethods.Call WindowProc(IntP tr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows. Forms.NativeWin dow.DefWndProc( Message& m)

at System.Windows. Forms.Control.D efWndProc(Messa ge& m)

at System.Windows. Forms.Control.W mUpdateUIState( Message& m)

at System.Windows. Forms.Control.W ndProc(Message& m)

at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)

at System.Windows. Forms.Container Control.WndProc (Message& m)

at System.Windows. Forms.ParkingWi ndow.WndProc(Me ssage& m)

at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)

at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)

at System.Windows. Forms.NativeWin dow.Callback(In tPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

Jul 21 '05 #1

Subscribe Reply

1757

Sebastian Dau

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discus sions.microsoft .com> wrote in message
news:E4******** *************** ***********@mic rosoft.com...

I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song
completes
I set the selected item in the listbox. I am assuming that is has to do
with
the listbox because of this line:

"at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)"

and the listbox is the only part of my program that has a scrollable
control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullRefe renceException: Object reference not set to an instance of
an
object.

at System.Windows. Forms.UnsafeNat iveMethods.Call WindowProc(IntP tr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows. Forms.NativeWin dow.DefWndProc( Message& m)

at System.Windows. Forms.Control.D efWndProc(Messa ge& m)

at System.Windows. Forms.Control.W mUpdateUIState( Message& m)

at System.Windows. Forms.Control.W ndProc(Message& m)

at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)

at System.Windows. Forms.Container Control.WndProc (Message& m)

at System.Windows. Forms.ParkingWi ndow.WndProc(Me ssage& m)

at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)

at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)

at System.Windows. Forms.NativeWin dow.Callback(In tPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

Jul 21 '05 #2

Sebastian Dau

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discus sions.microsoft .com> wrote in message
news:E4******** *************** ***********@mic rosoft.com...

I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song
completes
I set the selected item in the listbox. I am assuming that is has to do
with
the listbox because of this line:

"at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)"

and the listbox is the only part of my program that has a scrollable
control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullRefe renceException: Object reference not set to an instance of
an
object.

at System.Windows. Forms.UnsafeNat iveMethods.Call WindowProc(IntP tr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows. Forms.NativeWin dow.DefWndProc( Message& m)

at System.Windows. Forms.Control.D efWndProc(Messa ge& m)

at System.Windows. Forms.Control.W mUpdateUIState( Message& m)

at System.Windows. Forms.Control.W ndProc(Message& m)

at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)

at System.Windows. Forms.Container Control.WndProc (Message& m)

at System.Windows. Forms.ParkingWi ndow.WndProc(Me ssage& m)

at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)

at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)

at System.Windows. Forms.NativeWin dow.Callback(In tPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

Jul 21 '05 #3

Renzska

public void setSelected(int track)
{
listFormPlayLis t.SetSelected(t rack, true);
}

That is what I am doing. But I call it in a lot of different places. Could
that be the cause of my problem?

Thanks,

Renzska

"Sebastian Dau" wrote:

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discus sions.microsoft .com> wrote in message
news:E4******** *************** ***********@mic rosoft.com...
I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song
completes
I set the selected item in the listbox. I am assuming that is has to do
with
the listbox because of this line:

"at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)"

and the listbox is the only part of my program that has a scrollable
control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullRefe renceException: Object reference not set to an instance of
an
object.

at System.Windows. Forms.UnsafeNat iveMethods.Call WindowProc(IntP tr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows. Forms.NativeWin dow.DefWndProc( Message& m)

at System.Windows. Forms.Control.D efWndProc(Messa ge& m)

at System.Windows. Forms.Control.W mUpdateUIState( Message& m)

at System.Windows. Forms.Control.W ndProc(Message& m)

at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)

at System.Windows. Forms.Container Control.WndProc (Message& m)

at System.Windows. Forms.ParkingWi ndow.WndProc(Me ssage& m)

at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)

at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)

at System.Windows. Forms.NativeWin dow.Callback(In tPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

Jul 21 '05 #4

Renzska

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discus sions.microsoft .com> wrote in message
news:E4******** *************** ***********@mic rosoft.com...
I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song
completes
I set the selected item in the listbox. I am assuming that is has to do
with
the listbox because of this line:

"at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)"

and the listbox is the only part of my program that has a scrollable
control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullRefe renceException: Object reference not set to an instance of
an
object.

at System.Windows. Forms.UnsafeNat iveMethods.Call WindowProc(IntP tr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows. Forms.NativeWin dow.DefWndProc( Message& m)

at System.Windows. Forms.Control.D efWndProc(Messa ge& m)

at System.Windows. Forms.Control.W mUpdateUIState( Message& m)

at System.Windows. Forms.Control.W ndProc(Message& m)

at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)

at System.Windows. Forms.Container Control.WndProc (Message& m)

at System.Windows. Forms.ParkingWi ndow.WndProc(Me ssage& m)

at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)

at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)

at System.Windows. Forms.NativeWin dow.Callback(In tPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

Jul 21 '05 #5

Sebastian Dau

Hello,

NullReferenceEx ceptions in this native methods mostly happen
when own code mixes something up while running inside
of the native window thread.

Are your sure that track in your method call

listFormPlayLis t.SetSelected(t rack, true);

is not set to some value out of range?
Greets, Sebastian Dau

"Renzska" <Re*****@discus sions.microsoft .com> wrote in message
news:DF******** *************** ***********@mic rosoft.com...

public void setSelected(int track)
{
listFormPlayLis t.SetSelected(t rack, true);
}

That is what I am doing. But I call it in a lot of different places.
Could
that be the cause of my problem?

Thanks,

Renzska

"Sebastian Dau" wrote:
Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discus sions.microsoft .com> wrote in message
news:E4******** *************** ***********@mic rosoft.com...
>I am getting a random crash in my program. I think it has to do with
>the
> only listbox I have. It uses the WMP to play songs and when a song
> completes
> I set the selected item in the listbox. I am assuming that is has to
> do
> with
> the listbox because of this line:
>
> "at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)"
>
> and the listbox is the only part of my program that has a scrollable
> control.
>
>
> Any help in fixing this would be greatly appreciated.
>
> Here is the debug info:
>
> See the end of this message for details on invoking
>
> just-in-time (JIT) debugging instead of this dialog box.
>
>
>
> ************** Exception Text **************
>
> System.NullRefe renceException: Object reference not set to an instance
> of
> an
> object.
>
> at System.Windows. Forms.UnsafeNat iveMethods.Call WindowProc(IntP tr
> wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
>
> at System.Windows. Forms.NativeWin dow.DefWndProc( Message& m)
>
> at System.Windows. Forms.Control.D efWndProc(Messa ge& m)
>
> at System.Windows. Forms.Control.W mUpdateUIState( Message& m)
>
> at System.Windows. Forms.Control.W ndProc(Message& m)
>
> at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)
>
> at System.Windows. Forms.Container Control.WndProc (Message& m)
>
> at System.Windows. Forms.ParkingWi ndow.WndProc(Me ssage& m)
>
> at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)
>
> at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)
>
> at System.Windows. Forms.NativeWin dow.Callback(In tPtr hWnd, Int32 msg,
> IntPtr wparam, IntPtr lparam)
>
>
> Thanks,
>
> Renzska
>

Jul 21 '05 #6

Renzska

Shouldn't be, but I'll check it out just to make sure.

Thanks,

Renzska

"Sebastian Dau" wrote:

Hello,

NullReferenceEx ceptions in this native methods mostly happen
when own code mixes something up while running inside
of the native window thread.

Are your sure that track in your method call

listFormPlayLis t.SetSelected(t rack, true);

is not set to some value out of range?
Greets, Sebastian Dau

"Renzska" <Re*****@discus sions.microsoft .com> wrote in message
news:DF******** *************** ***********@mic rosoft.com...
public void setSelected(int track)
{
listFormPlayLis t.SetSelected(t rack, true);
}

That is what I am doing. But I call it in a lot of different places.
Could
that be the cause of my problem?

Thanks,

Renzska

"Sebastian Dau" wrote:
Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discus sions.microsoft .com> wrote in message
news:E4******** *************** ***********@mic rosoft.com...
>I am getting a random crash in my program. I think it has to do with
>the
> only listbox I have. It uses the WMP to play songs and when a song
> completes
> I set the selected item in the listbox. I am assuming that is has to
> do
> with
> the listbox because of this line:
>
> "at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)"
>
> and the listbox is the only part of my program that has a scrollable
> control.
>
>
> Any help in fixing this would be greatly appreciated.
>
> Here is the debug info:
>
> See the end of this message for details on invoking
>
> just-in-time (JIT) debugging instead of this dialog box.
>
>
>
> ************** Exception Text **************
>
> System.NullRefe renceException: Object reference not set to an instance
> of
> an
> object.
>
> at System.Windows. Forms.UnsafeNat iveMethods.Call WindowProc(IntP tr
> wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
>
> at System.Windows. Forms.NativeWin dow.DefWndProc( Message& m)
>
> at System.Windows. Forms.Control.D efWndProc(Messa ge& m)
>
> at System.Windows. Forms.Control.W mUpdateUIState( Message& m)
>
> at System.Windows. Forms.Control.W ndProc(Message& m)
>
> at System.Windows. Forms.Scrollabl eControl.WndPro c(Message& m)
>
> at System.Windows. Forms.Container Control.WndProc (Message& m)
>
> at System.Windows. Forms.ParkingWi ndow.WndProc(Me ssage& m)
>
> at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)
>
> at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)
>
> at System.Windows. Forms.NativeWin dow.Callback(In tPtr hWnd, Int32 msg,
> IntPtr wparam, IntPtr lparam)
>
>
> Thanks,
>
> Renzska
>

Jul 21 '05 #7

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