System.AccessViolationException

Question

System.AccessViolationException

Strong, Brandon J 1

Hello!

I am having this error message:
System.AccessViolationException
HResult=0x80004003
Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source=<Cannot evaluate the exception source>
StackTrace:
<Cannot evaluate the exception stack trace>

About the error:
I am using C# on .NET Framework 4.8. The error is very inconsistent, it can happen within a few seconds, or in 10 minuets. This error appears both in release, and debug mode. It seems to happen faster when it's in release mode.
These are the packages that I'm using
- ClosedXML (0.96.0)
- AForge (2.2.5)
- AForge.Imaging (2.2.5)
- AForge.Math (2.2.5)
- Emgu.CV (4.3.0.3890)
- Emgu.CV.runtime.windows (4.3.0.3890)
- ExcelNumberFormat (1.1.0)
- ZedGraph (5.1.7)
- Microsoft.CSharp (4.7.0)
- DocumentFormat.OpenXml (2.16.0)

This is where it happens in the code:

Here is an image of the quick watch:

I have looked at quite a few different threads and I can't seem to figure out how to fix this issue.

These are the things that I've tried so far:

Changing solution platforms to be x64, x86, or AnyCPU (I cleaned and rebuilt the solution after each of these changes)
Enabled native code debugging
"Suppress JIT optimization on module load" in: Tools menu ->Options -> Debugging -> General
Switching Emgu.cv to EmguCV
Removing non-essential NuGet packages
Changing the version of the NuGet packages

From here I'm not really sure what else to try, would appreciate any feedback.

Thanks in advance! :)

Jack J Jun 25,296 Reputation points

2022-08-18T09:26:35.823+00:00

@Strong, Brandon J , Welcome to Microsoft Q&A, how do you transfer the Bitmap object? If you changed the source for the Bitmap, is it still occur the exception?
Strong, Brandon J 1 Reputation point

2022-08-18T13:38:32.313+00:00

The IdentifyContours function where the error happens, is called from the function FindDots:

That function is called from a timerTick function. FinalThreshBitmap is the Bitmap being passed in. The Bitmap is declared in the MainWindow class so all the functions in that class have access to the variable. The Bitmap gets set from another Bitmap.

TimerTick:

Bitmap set:

I have passed the bitmap in as a reference before, didn't solve the problem. The program has different Bitmaps I did use one of the other ones and it still had the error. I will create a new bitmap with a static image and let you know how it goes.

1 answer

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Jack J Jun 25,296 Reputation points

2022-08-18T09:26:35.823+00:00

@Strong, Brandon J , Welcome to Microsoft Q&A, how do you transfer the Bitmap object? If you changed the source for the Bitmap, is it still occur the exception?
Strong, Brandon J 1 Reputation point

2022-08-18T13:38:32.313+00:00

The IdentifyContours function where the error happens, is called from the function FindDots:

That function is called from a timerTick function. FinalThreshBitmap is the Bitmap being passed in. The Bitmap is declared in the MainWindow class so all the functions in that class have access to the variable. The Bitmap gets set from another Bitmap.

TimerTick:

Bitmap set:

I have passed the bitmap in as a reference before, didn't solve the problem. The program has different Bitmaps I did use one of the other ones and it still had the error. I will create a new bitmap with a static image and let you know how it goes.

Answer 1

Strong, Brandon J 1

I figured out the issue.

The issue was that the function that was being called to do the thresholding was a form event. The Timer was calling that function. Switching thresholding to be a normal function fixed the issue.

Original function:

Original Call:

New function:

New Call:

Thanks for the help! :)

Have a great day.

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System.AccessViolationException

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