private void OnPageTextRequested(object sender, PageTextRequestedEventArgs pageTextRequestedEventArgs)
{
var serverPath = HttpContext.Current.Server.MapPath(pageTextRequestedEventArgs.FilePath);
if (File.Exists(serverPath))
{
using (var stream = File.OpenRead(serverPath))
{
try
{
var decoder = RegisteredDecoders.GetDecoder(stream) as ITextFormatDecoder;
if (decoder != null)
{
using (var extractor = new SegmentedTextTranslator(decoder.GetTextDocument(stream)))
{
// for documents that have comlicated structure, i.e. consist from the isolated pieces of text, or table structure
// it's possible to configure nearby text blocks are combined into text segments(text containers that provide
// selection isolated from other document content)
extractor.RegionDetection = TextRegionDetectionMode.BlockDetection;
// each block boundaries inflated to one average character width and two average character height
// and all intersecting blocks are combined into single segment.
// Having vertical ratio bigger then horizontal behaves better on column-layout documents.
extractor.BlockDetectionDistance = new System.Drawing.SizeF(1, 2);
pageTextRequestedEventArgs.Page = extractor.ExtractPageText(pageTextRequestedEventArgs.Index);
}
}
}
catch (ImageReadException imagingException)
{
Debug.WriteLine("Text extraction: image type is not recognized. {0}", imagingException);
}
}
}
}
protected override void OnPageTextRequested(PageTextRequestedEventArgs e)
{
base.OnPageTextRequested(e);
}
