Leadtools.Barcode Namespace > BarcodeReader Class > ReadBarcode Method : ReadBarcode(RasterImage,LogicalRectangle,BarcodeSymbology) Method |
public BarcodeData ReadBarcode( RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology symbology )
'Declaration Public Overloads Function ReadBarcode( _ ByVal image As RasterImage, _ ByVal searchBounds As LogicalRectangle, _ ByVal symbology As BarcodeSymbology _ ) As BarcodeData
'Usage Dim instance As BarcodeReader Dim image As RasterImage Dim searchBounds As LogicalRectangle Dim symbology As BarcodeSymbology Dim value As BarcodeData value = instance.ReadBarcode(image, searchBounds, symbology)
public BarcodeData ReadBarcode( RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology symbology )
ObjectiveC Syntax
function Leadtools.Barcode.BarcodeReader.ReadBarcode(RasterImage,LogicalRectangle,BarcodeSymbology)( image , searchBounds , symbology )
public: BarcodeData^ ReadBarcode( RasterImage^ image, LogicalRectangle searchBounds, BarcodeSymbology symbology )
Use these methods if you want to read a single barcode from the image, for example, a QR symbol by specifying BarcodeSymbology.QR or if you want to read any barcode found regardless of its type by using BarcodeSymbology.Unknown.
For more information on barcode reading, refer to BarcodeReader.
This method will use the default read options set in this BarcodeReader that correspond to symbology. If the value of this parameter is BarcodeSymbology.Unknown, then all the default read options might be used.
LEADTOOLS barcode read engine is optimized for speed and can search for multiple similar symbologies at the same time. This method simply returns the first barcode that is detected correctly using the symbology and current options.
The ReadSymbology event will occur before and after attempting to read any symbology. The read options being used whether the default or specified will be set in the BarcodeReadSymbologyEventArgs.Options property of the event data.
The BarcodeReader provides the following barcode read methods:
Method | Description |
---|---|
ReadBarcode(RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology symbology) and ReadBarcode(RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology symbology, BarcodeReadOptions options) |
Read one barcode from an image with specified symbology and default or specific options. Use these methods if you want to read a single barcode from the image, for example, a QR symbol by specifying BarcodeSymbology.QR or if you want to read any barcode found regardless of its type by using BarcodeSymbology.Unknown. |
ReadBarcode(RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology[] symbologies) and ReadBarcode(RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology[] symbologies, BarcodeReadOptions[] options) |
Read one barcode from an image with a symbology from a specified group and default or specific options. Use these methods if you want to read a single barcode from a known group. For example, to read a barcode that can be of any UPC type, pass an array of BarcodeSymbology.UPCA and BarcodeSymbology.UPCE. |
ReadBarcodes(RasterImage image, LogicalRectangle searchBounds, int maximumBarcodes, BarcodeSymbology[] symbologies) and ReadBarcodes(RasterImage image, LogicalRectangle searchBounds, int maximumBarcodes, BarcodeSymbology[] symbologies, BarcodeReadOptions[] options) |
Read multiple barcodes from an image with symbologies from a specified group and and default or specific options. Use these methods if you want to read multiple barcodes of the same or multiple symbologies. |
Public Sub BarcodeReader_ReadBarcodeExample1() Dim imageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Barcode2.tif") ' Create a Barcode engine Dim engine As New BarcodeEngine() ' Get the Barcode reader instance Dim reader As BarcodeReader = engine.Reader ' Load the image Using codecs As New RasterCodecs() Using image As RasterImage = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1) ' Read the QR barcode from this image Dim barcode As BarcodeData = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR) ' Show its location and data if found If Not IsNothing(barcode) Then Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value) Else Console.WriteLine("Not found") End If End Using End Using End Sub Public NotInheritable Class LEAD_VARS Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" End Class
public void BarcodeReader_ReadBarcodeExample1() { string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "Barcode2.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)) { // Read the QR barcode from this image BarcodeData barcode = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR); // Show its location and data if found if(barcode != null) { Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value); } else { Console.WriteLine("Not found"); } } } } static class LEAD_VARS { public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; }
public void BarcodeReader_ReadBarcodeExample1(RasterImage image) { // Create a Barcode engine BarcodeEngine engine = new BarcodeEngine(); // Get the Barcode reader instance BarcodeReader reader = engine.Reader; // Load the image RasterCodecs codecs = new RasterCodecs(); // Read the QR barcode from this image BarcodeData barcode = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR); // Show its location and data if found if(barcode != null) { Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value); } else { Console.WriteLine("Not found"); } }
Public Sub BarcodeReader_ReadBarcodeExample1(ByVal image As RasterImage) ' Create a Barcode engine Dim engine As BarcodeEngine = New BarcodeEngine() ' Get the Barcode reader instance Dim reader As BarcodeReader = engine.Reader ' Load the image Dim codecs As RasterCodecs = New RasterCodecs() ' Read the QR barcode from this image Dim barcode As BarcodeData = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR) ' Show its location and data if found If Not barcode Is Nothing Then Console.WriteLine("Found at {0}, data:" & Constants.vbLf & "{1}", barcode.Bounds, barcode.Value) Else Console.WriteLine("Not found") End If End Sub
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
BarcodeReader Class
BarcodeReader Members
Overload List
ReadBarcode(RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology symbology, BarcodeReadOptions options)
ReadBarcode(RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology[] symbologies)
ReadBarcode(RasterImage image, LogicalRectangle searchBounds, BarcodeSymbology[] symbologies, BarcodeReadOptions[] options)
ReadBarcodes(RasterImage image, LogicalRectangle searchBounds, int maximumBarcodes, BarcodeSymbology[] symbologies)
ReadBarcodes(RasterImage image, LogicalRectangle searchBounds, int maximumBarcodes, BarcodeSymbology[] symbologies, BarcodeReadOptions[] options)
Programming with LEADTOOLS Barcode
Supported Barcode Symbologies
Unlocking Barcode Support
Reading Barcodes Tutorial