KeyNotFoundException when running sample

[CapCap]

using(var engine = new TesseractEngine( "./tessdata", "eng", EngineMode.Default ))
causes error:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictio
nary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at InteropDotNet.LibraryLoader.LoadLibrary(String fileName, String platformName)
   at InteropRuntimeImplementer.LeptonicaApiSignaturesInstance.LeptonicaApiSignaturesImplementation..ctor(LibraryLoader loader)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark)
   at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Activator.CreateInstance(Type type, Object[] args)
   at InteropDotNet.InteropRuntimeImplementer.CreateInstance[T]()
   at Tesseract.Interop.LeptonicaApi.Initialize()
   at Tesseract.Interop.TessApi.Initialize()
   at Tesseract.Interop.TessApi.get_Native()
   at Tesseract.TesseractEngine..ctor(String datapath, String language, EngineMode engineMode, IEnumerable`1 configFiles)
   at Tesseract.TesseractEngine..ctor(String datapath, String language, EngineMode engineMode)
   at EDMarketOCR.Program.Main(String[] args) in c:\Users\NoOne\Desktop\ED\EDMarketOCR\EDMarketOCR\Program.cs:line 60
Unexpected Error: Exception has been thrown by the target of an invocation.

[charlesw]

Thanks for the bug report, will be fixed in the next release.

Note: That this was occurring because it failed to find the dlls might be worth turning on tracing for the 'Tesseract' source to work out where it's looking:

<system.diagnostics>
    <sources>
      <source name="Tesseract" switchValue="Information">
        <listeners>
          <add name="configConsoleListener" type="System.Diagnostics.ConsoleTraceListener" />
        </listeners>
      </source>
    </sources>
</system.diagnostics>

As the 'fix' just throws a more explicit error it won't resolve the underlying issue.

[lreading]

I'm experiencing the same exception with the same line of code.

There is an inner Exception that says "The given key was not present in the dictionary."

I did not have this problem when I used the nuget package in a WCF application project, but when I created a class library then referenced the class library from a different WCF project it started happening.

Hopefully that helps, and thank you for maintaining this code! Please let me know if there's anything I can do to help.

[xcud]

I ran into this when distributing a class library to a fresh machine. I turned on verbose logging to discover that the library it was unable to load was the MS Visual C++ Redistributable. Installing this resolved the issue: http://www.microsoft.com/en-us/download/details.aspx?id=30679#

[lreading]

I'll double check to make sure I have the C++ redistributables installed tomorrow.

I was using the same machine the entire time... Interesting that it works in the WCF service and not the class library.... I will update tomorrow, thank you!!

[xcud]

Grab the dependency walker (http://www.dependencywalker.com/) and use that to open up the lib files in the platform (x86 or x64 depending on your machine). That'll tell you if a dependency, MSVCRT*.dll or something else, is missing.

[charlesw]

Also double check the native tesseract dlls (x86 and x64) are being
distributed. If your taking a reference on a class library these may NOT be
being copied to your program's bin file.

On Tue, Jan 27, 2015 at 2:49 PM, Leo notifications@github.com wrote:

I'll double check to make sure I have the C++ redistributables installed
tomorrow.

I was using the same machine the entire time... Interesting that it works
in the WCF service and not the class library.... I will update tomorrow,
thank you!!

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