public Exception Error { get; }
@property (nonatomic, strong, readonly, nullable) NSError* error;
public RuntimeException getError()
public:
property Exception^ Error {
Exception^ get();
}
Error # get (BarcodeReadSymbologyEventArgs)
An Exception object that contains any error that may have occurred during the read operation. Otherwise (no errors occurred), it will be null (Nothing in VB).
If an error occurs during the read operation and Error contains a valid exception object, then depending on the value of BarcodeReader.ErrorMode, the BarcodeReader object may throw this exception after the event handler returns. This is determined as follows:
Value | Action |
---|---|
BarcodeReaderErrorMode.Default |
(Default behavior). The BarcodeReader will throw the error after the event handler returns. You must catch this exception in your application. |
BarcodeReaderErrorMode.IgnoreAll |
The Exception object is still in Error, but the BarcodeReader will not throw the exception when the event handler returns. It is up to you to decide if and when to throw the exception and how to handle it. The C# and VB Barcode Main Demo shows the errors (if any) in a list after the read operation is completed. |
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Barcode;
using Leadtools.ImageProcessing;
public void BarcodeReader_ReadSymbologyExample()
{
string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "Barcode1.tif");
// Create a Barcode engine
BarcodeEngine engine = new BarcodeEngine();
// Get the Barcode reader instance
BarcodeReader reader = engine.Reader;
// Load the image
using (RasterCodecs codecs = new RasterCodecs())
{
using (RasterImage image = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1))
{
// Subscribe to the ReadSymbology event
reader.ReadSymbology += new EventHandler<BarcodeReadSymbologyEventArgs>(reader_ReadSymbology);
// Read all barcodes in the image
reader.ReadBarcodes(image, LeadRect.Empty, 0, null);
reader.ReadSymbology -= new EventHandler<BarcodeReadSymbologyEventArgs>(reader_ReadSymbology);
}
}
}
private void reader_ReadSymbology(object sender, BarcodeReadSymbologyEventArgs e)
{
if (e.Operation == BarcodeReadSymbologyOperation.PreRead)
{
// Before reading, show the symbologies the engine is going to try to read
Console.WriteLine("Trying to read the following symbologies:");
BarcodeSymbology[] symbologies = e.GetSymbologies();
for (int i = 0; i < symbologies.Length; i++)
{
Console.Write(symbologies[i]);
if (i != (symbologies.Length - 1))
{
Console.Write(", ");
Console.WriteLine(e.Options.FriendlyName);
}
else
{
Console.WriteLine();
}
}
}
else if (e.Operation == BarcodeReadSymbologyOperation.PostRead)
{
if (e.Error == null)
{
// No errors
BarcodeData barcode = e.Data;
if (barcode != null)
{
// Found a barcode, show it
Console.WriteLine(" {0} at {1} with data {2}", barcode.Symbology, barcode.Bounds, barcode.Value);
}
else
{
Console.WriteLine(" No barcodes found");
}
}
else
{
// Show the error
Console.WriteLine("Error: {0}", e.Error.Message);
// Tell the reader top stop reading barcodes
e.Status = BarcodeReadSymbologyStatus.Abort;
}
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}
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