public delegate void PageRequestCallback(PageRequestCallbackData data)
data
An instance of the PageRequestCallbackData interface containing the requested image information.
This delegate is useful when the number of form pages is not known before recognizing the form or when the users does not want to load all image pages in the memory or load them via network while he needs to process few of them. So the user loads the first page of the form and uses it for recognition, then for processing he will be asked to provide only the pages that have processing fields.
using Leadtools;using Leadtools.Codecs;using Leadtools.Forms.Common;using Leadtools.Forms.Auto;using Leadtools.Document;using Leadtools.Ocr;using Leadtools.Forms.Recognition;using Leadtools.Forms.Processing;using Leadtools.Barcode;using Leadtools.Forms;public RasterCodecs Codecs;public string FormFileName;public void MyPageRequestCallback(PageRequestCallbackData data){data.Page = Codecs.Load(FormFileName, 1, CodecsLoadByteOrder.Bgr, data.FormPageNumber, data.FormPageNumber);}public void AutoFormRunAutomatic(){string root = Path.Combine(LEAD_VARS.ImagesDir, @"Forms\FormsDemo\OCR_Test");RasterCodecs codecs = new RasterCodecs();//create repositoryDiskMasterFormsRepository repository = new DiskMasterFormsRepository(codecs, root);using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)){ocrEngine.Startup(null, null, null, LEAD_VARS.OcrLEADRuntimeDir);BarcodeEngine barcodeEngine = new BarcodeEngine();//create AutoForm EngineAutoFormsEngine autoEngine = new AutoFormsEngine(repository, ocrEngine, barcodeEngine);//set the flag to process the first page onlyautoEngine.RecognizeFirstPageOnly = true;autoEngine.MinimumConfidenceKnownForm = 40;//calculate the minimum confidence recognized form according to the correlation between the master forms in the repositoryautoEngine.MinimumConfidenceRecognized = autoEngine.GetMinimumRecognizedConfidenceForm();Codecs = codecs;FormFileName = Path.Combine(LEAD_VARS.ImagesDir, @"Forms\Forms to be Recognized\OCR\FCC-107_OCR_Filled.tif");//load the first page of the imageRasterImage form = codecs.Load(FormFileName, 1, CodecsLoadByteOrder.Bgr, 1, 1);//recognize and process the formAutoFormsRunResult result = autoEngine.Run(form, MyPageRequestCallback, null, null);if (result == null)return;}}static class LEAD_VARS{public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images";public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS23\Bin\Common\OcrLEADRuntime";}