Extracting JPEG files from Adobe Lightroom previews

I need to figure out how to extract previews from Adobe Lightroom as JPEG files.  I am trying to develop an external app that will read Lightroom's plugins - I need to do it in either C++, C# or Java.  So far all examples I found were in Lua.  Any help/code examples would be greatly appreciated.

I think he is looking for C/Java code, not a script/plugin.
In any case, anybody looking to recover previews should be aware that most plugins or external apps DO NOT assign a proper ICC profile to the extracted previews. The extracted previews are *usually*, meaning NOT ALWAYS AdobeRGB, but untagged: will be interpreted as sRGB. Yeah, that's why they will look different than the original.
I don't know about JF's plugin.
(Adobe's recovery script does NOT handle ICC profiles correctly).
PreviewExporter is the only plugin I know of that handles ICC profiles properly - if anybody knows how JF's plugin handles ICC profiles - do tell.
Note: PreviewExporter includes source code - it should be straight-forward to translate to C/Java.
Rob

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