Hello Aspose Team,
This one took me awhile to figure out. ;-)
When I generate a aspose barcode with the checksum enabled and the value of "P2D" or "P20D" aspose sets the checksum character as a period ("."). However this is not correct and when I read the barcode with checksum = true it fails on the checksum check. The appropriate check character for the above codes is "1".
Here's the math.
P=25, 2=2, 0=0, D=13
40 / 43 = 0 with a remainder of 40
40 corresponds to a "/" not a ".".
See the attached pdf genertated with aspose for more info.
Here is the code used to generate. May barcode lib version is 18.104.22.168.
MemoryStream f = new MemoryStream();
BarCodeWebControl bc = new Aspose.BarCode.Web.UI.BarCodeWebControl(_barcode, Symbology.Code39Standard);
bc.GraphicsUnit = System.Drawing.GraphicsUnit.Point;
bc.Resolution = new Resolution(_resolution, _resolution, ResolutionMode.Graphics);
bc.AutoSize = true;
bc.ImageQuality = ImageQualityMode.AntiAlias;
bc.xDimension = _barWidth;
bc.BarHeight = _barHeight;
bc.EnableChecksum = true;
bc.CodeTextFont = new System.Drawing.Font(System.Drawing.FontFamily.GenericMonospace, _labelFont);
bc.CodeText = "P" + checkedNode.Value.Trim() + "D";
bc.Margins.Left = 0;
bc.Margins.Top = 0;
bc.Margins.Bottom = 0;
bc.Margins.Right = 0;
byte barcodeImage = f.ToArray();
Also please email me with the any responses. gravest ppsc.com