Error : 'System.AccessViolationException' occurred in InteropRuntimeImplementer.TessApiSignaturesInstance

[satishreddy81]

While trying to run Samples with attached image. i am getting following error:

An unhandled exception of type 'System.AccessViolationException' occurred in InteropRuntimeImplementer.TessApiSignaturesInstance

Could please help me? Screen shot attached

Thanks,
Satish

[charlesw]

Opps I forgot to update the Samples to the new Tesseract release (3.0). I'll have a look at doing this tomorrow.

[charlesw]

If you've upgraded to 3.0, then it could be due to issue #232. I'll try and put together a fix tomorrow morning.

[YoungjaeKim]

The AccessViolationException occurs not only x64, but also x86 version in 3.0.0 when I perform AnalyzeLayout(); method in 50% probability. @charlesw did you figure it out also?

[charlesw]

Yes, I have noticed that some of the time I'm getting AccessViolationException as well. I'll have a look but for the meantime I'd strongly suggest using version 2.4.1 instead.

[YoungjaeKim]

Always appreciate your effort. thanks.

[charlesw]

Just rebuilt the native tesseract libraries and re-added them (ab4d506). Seems to be working for me now however would appreciate it if someone else could also verify that it's working for them too.

[charlesw]

Note to use the samples in dev you'll need to build local copy of the Tesseract nuget package (3.0.1) and place it in your nuget package path:

1. Execute build.bat to build the nuget package and copy it to `C:\Nuget packages`` (or wherever you want to store your local nuget packages
2. From VS 2015 (note its a similar process in older versions):
   1. Click Tools -> Options
   2. Select Nuget Package Manager -> Package Sources
   3. Click the Add button to add a new source and C:\Nuget packages for the source and a meaningful name and click Update
3. VS should now be able to find your copy of the Tesseract nuget package

Note: You can skip step 2 if you've already got this setup of course.

[ermGit]

Did this ever get solved? I am using 3.0.1 from NuGet package install. I am receiving the same error: System.AccessViolationException' occurred in InteropRuntimeImplementer.TessApiSignaturesInstance
when GetText() is called.

What version should I use if I build my own nuget package?

[charlesw]

I'm guessing that the answer is no as you're still getting the error. I think that something is wrong with the native build of the tesseract library. Not sure what though.

[Rodbourn]

I'm having the same problem as well.

[charlesw]

I've split of the samples into the own repo (https://github.com/charlesw/tessseract-samples) to make it easier to maintain and so they can be improved independently of this wrapper.

I've also had a quick further look at this bug and unfortunately I cannot reliably reproduce it (just ran the console sample 20+ times and it didn't occur once). Can anyone else check this out and ideally provide an example more info on how to reproduce this?

[Rodbourn]

@charlesw, I get the error every time without fail in the same way as @satishreddy81. I started down the path of building all of the dependencies from scratch, but it didn't help. This happens when I run any number of inputs, not just the samples not just on occasion.

I tried version 3.0.0 specifically as I had tried 3.0.1, both fail in the same way.

[Rodbourn]

Note, if I force the x86 platform it's intermittent.