Hi,
We make an intensive use of the Aspose barcode reader, we use it to read barcodes from like 3000 document/day.
The library fails to read barcodes ( or gives wrong value ) in some cases, where the codebare is clear and other libraries (
http://demo.leadtools.com/OnlineRecognitionDemo/default.aspx ) give the expected value very fast ( 22ms, but this is more due to the native code speed ).Please find attached 34 samples of those documents :
Guid.jpeg => Aspose BarCode couldn’t extract the barcode
Guid
#barcode => it did but the barcode value is wrongThe barcode is a 128Code and should be something like : “00100 PER000184412050614003897971”. They all must start with "00100 ".
Here is our code :
public static IEnumerable ReadBarCodesFromPdf(string filePath, int barcodePerPage = 1, float relativeX = 0, float relativeY = 0, float relativeWidth = 1, float relativeHeight = 1, BarCodeReadType codeType = BarCodeReadType.AllSupportedTypes)
{
if (System.IO.Path.GetExtension(filePath).ToLower() != “.pdf”)
yield break;
using (var pdf = new Aspose.Pdf.Document(filePath))
for (int i = 0; i < pdf.Pages.Count; ++i)
{
var abs = new ImagePlacementAbsorber();
pdf.Pages[i + 1].Accept(abs);
foreach( ImagePlacement imagePlacement in abs.ImagePlacements)
{
var xImage = imagePlacement.Image;
using (var memStream = new MemoryStream())
{
var barCode = default(string);
var barCodeRegion = default(BarCodeRegion);
xImage.Save(memStream);
var strbuilder = new StringBuilder();
using (var bitmap = new Bitmap(memStream))
{
var imguid = Guid.NewGuid();
bitmap.Save(string.Format(“e:\{0}.jpeg”, imguid));
using (var barcodeReader = new BarCodeReader(bitmap, new System.Drawing.Rectangle((int)(bitmap.Width * relativeX), (int)(bitmap.Height * relativeY), (int)(bitmap.Width * relativeWidth), (int)(bitmap.Height * relativeHeight)), codeType))
{
barcodeReader.ExpectedBarCodeCount = barcodePerPage;
barcodeReader.Timeout = 30000;
var nb = barcodePerPage;
while (nb-- > 0)
{
try
{
var readValue = false;
Thread taskThread = null;
var task = Task.Factory.StartNew(() => {taskThread = Thread.CurrentThread; readValue = barcodeReader.Read(); }, TaskCreationOptions.LongRunning);
Task.WaitAll(new Task[] { task }, 35000);
//try
//{
// if (!task.IsCompleted && taskThread != null)
// taskThread.Abort();
//}
//catch(NullReferenceException ex) // il peut devenir null entre temps
//{ }
// GC.Collect();
if (!readValue)
break;
}
catch (Exception ex)
{
_log.Error(string.Format(“Error when trying to extract from file {0} | page : {1}”, filePath, i), ex);
break;
}
var region = barcodeReader.GetRegion();
if (region != null)
{
barCode = barcodeReader.GetCodeText();
bitmap.Save(string.Format(“e:\{0} #{1}.jpeg”, imguid, barCode));
barCodeRegion = region;
yield return new BarCode(i + 1, barCodeRegion, barCode);
_log.InfoFormat(“BarCode : {0}”, barCode);
break;
}
}
}
}
}
}
}
}
We use the version 6.0.0, we haven’t seen a resolved ticket in the new versions that could solve this.
Thanks in advance,