Simple custom control (slider) crashes NT8

[gregid]

Attached is a sample displaying the behaviour (in the Indicator list it will be in the Samples folder)

To replicate open NinjaScript Output and add SampleSliderX01 Indicator to the chart.

On the Top Right of the chart you have small slider - move it to the left and right (it will output slider values from 1 to 6 in the output window) - if there is more stuff on the chart it will crash quickly if it is by itself move slider quicker for a crash to happen.

[NinjaTrader_Matthew]

Hi gregid,

Thanks for the report.

I added this sample to my chart but I was not able to reproduce any crash by moving the slider.

If by "more stuff on the chart" you mean other user controls, I also added a sample button to the user control collection and could not reproduce the crash either.

Here is a quick video of what I did:

http://screencast.com/t/8xZLBh3wtTz

Please let me know what I may be missing... I also attached the script I used which adds to the user control collection.

At any rate, since you were able to reproduce on your end - you may want to test again using the ChartControl.Dispatcher, rather than the NinjaScript(this).Dispatcher()

Please let me know if that helps/does not.

Is there an exception thrown when it crashes? If so, do you have any messages or inner exception messages you can pass along if you attached you custom project to a visual studio debugger?

[gregid]

Hmm... On my end what you were doing would definitely result in a crash. There is no exception and trace log is clear, just crash (and it happens every time). I'll come back to you tomorrow hopefully with some some more info.

[gregid]

I managed to get the exception in the debug mode this time in VS:

System.AccessViolationException was unhandled
Message: An unhandled exception of type 'System.AccessViolationException' occurred in PresentationCore.dll
Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

[gregid]

If it is of any value - I am running NT8 on Windows 10. Changing dispatcher didn't help.

I also tried adding DispatcherTimer (with 1 second interval) to decrease the number of time the events are executing changes - it helped a bit but after some more tries it also crashed.

[NinjaTrader_Matthew]

Ok, thanks - I'm on Win7 myself, I'll check with a colleague who uses Win10.

[NinjaTrader_Matthew]

Ok, thanks - I'm on Win7 myself, I'll check with a colleague who uses Win10.

Unfortunately - he reported the same as me...

What version of VS are you debugging in? What version of .NET is installed on your system?

[gregid]

Unfortunately - he reported the same as me...

What version of VS are you debugging in? What version of .NET is installed on your system?

Microsoft Visual Studio Community 2015
Version 14.0.23107.0 D14REL
Microsoft .NET Framework
Version 4.6.00079

Installed Version: Community

[gregid]

Trying the obvious

I decided to try the obvious and restarted my machine and ... Voila!
Trying hard to crash it but it seems it works fine now!