HOW-TO: Splitting an Existing File into Multiple Files using Patch Codes

      public static void SplitPatchDocument(string inputFile)
      {
         RasterCodecs codecs = new RasterCodecs();

         codecs.Options.Load.AllPages = true;

         BarcodeReader reader = new BarcodeEngine().Reader;

         RasterImage image = codecs.Load(inputFile);

         int startPage = 1;
         int sectionNumber = 1;

         // iterate over each page in the document
         for (int i = 0; i < image.PageCount; i++)
         {
            image.Page = i + 1;

            // check the page for patch codes
            BarcodeData[] data = reader.ReadBarcodes(image, LeadRect.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.PatchCode });

            // if a patch code is here, save out this portion of the document
            if (data.Length > 0)
            {
               string filename = string.Format("split_{0}.tif", sectionNumber);
               codecs.Save(image, filename, RasterImageFormat.Tif, 0, startPage, image.Page, 1, CodecsSavePageMode.Overwrite);

               // set the page to start the next document section on to be the next page after the patch page to prevent doubles
               startPage = image.Page + 1;

               // increment the iterator for the divided files
               sectionNumber++;
            }
         }

         // finally, save the pages from the last patch page detected to the end of the document
         if (startPage <= image.PageCount)
         {
            string filename = string.Format("split_{0}.tif", sectionNumber);
            codecs.Save(image, filename, RasterImageFormat.Tif, 0, startPage, image.PageCount, 1, CodecsSavePageMode.Overwrite);
         }
      }