PdfTools.GetConversionResult doesn't frees memory about wkhtmltopdf-dotnet

[HakanL]

I'm pretty sure we shouldn't call Marshal.FreeHGlobal on GetConversionResult since the buffer is allocated in the native library, vs the other places where Marshal.Copy is used where we allocate memory with Marshal.AllocHGlobal. It sounds more like your issue is that you're not using the SynchronizedConverter.

[SavoFortech]

hi, thank you for reply, im instantiate it in startup.cs for my DI with:
services.AddSingleton(typeof(IConverter), new SynchronizedConverter(new PdfTools()));

But we face with the problem very very rarely, normally it works well. For this reason we are thinking in a sort of race condition

[HakanL]

Ok, yeah that is correct. I don't have any other ideas on what may cause your issue, since this is just a wrapper around the native library, it is possible there is an issue in the native library, or an issue with the interop.