/// <summary>
/// Uses parallel processing to perform OCR on the mailing address region of the pdf files.
/// Calls other methods to update the pdf files with that OCR information and builds a
/// dictionary for file paths with associated page counts.
/// </summary>
/// <param name="inputFiles">List of files to be processed.</param>
/// <param name="currentFolder">Active input directory.</param>
/// <returns>Dictionary of file paths and associated page counts.</returns>
internal static Dictionary <string, int> Process(IEnumerable <string> inputFiles, KeyValuePair <string, string> currentFolder)
{
var filePageCounts = new ConcurrentDictionary <string, int>();
SetupOcrWorkingDirectory();
Parallel.ForEach(inputFiles, file =>
{
string returnedText;
using (var document = new PDFDocument(file))
{
filePageCounts.TryAdd(file.ToString(), document.Pages.Count);
using (var ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false))
{
ocrEngine.Startup(null, null, OcrWorkingDir, OcrAdvantageRuntimeDir);
ocrEngine.SpellCheckManager.SpellCheckEngine = OcrSpellCheckEngine.None;
returnedText = GetAddressBlockText(ocrEngine, document);
ocrEngine.Shutdown();
}
}
PdfUtility.OverlayOcrText(returnedText, file, currentFolder);
}
);
var returnDictionary = filePageCounts.ToDictionary(kvp => kvp.Key,
kvp => kvp.Value);
return(returnDictionary);
}
