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ReadBarcode(RasterImage,LogicalRectangle,BarcodeSymbology,BarcodeReadOptions) Method

Summary

Read one barcode from an image with specified symbology and options.

Syntax

Java

Objective-C

WinRT C#

C++

public BarcodeData ReadBarcode( 
   RasterImage image, 
   LogicalRectangle searchBounds, 
   BarcodeSymbology symbology, 
   BarcodeReadOptions options 
)

Public Overloads Function ReadBarcode( _ 
   ByVal image As Leadtools.RasterImage, _ 
   ByVal searchBounds As Leadtools.Forms.LogicalRectangle, _ 
   ByVal symbology As Leadtools.Barcode.BarcodeSymbology, _ 
   ByVal options As Leadtools.Barcode.BarcodeReadOptions _ 
) As Leadtools.Barcode.BarcodeData

public Leadtools.Barcode.BarcodeData ReadBarcode(  
   Leadtools.RasterImage image, 
   Leadtools.Forms.LogicalRectangle searchBounds, 
   Leadtools.Barcode.BarcodeSymbology symbology, 
   Leadtools.Barcode.BarcodeReadOptions options 
)

- (nullable LTBarcodeData *)readBarcode:(LTRasterImage *)image 
                           searchBounds:(LeadRect)searchBounds 
                              symbology:(LTBarcodeSymbology)symbology 
                                options:(nullable LTBarcodeReadOptions *)options 
                                  error:(NSError **)error

public BarcodeData readBarcode( 
  RasterImage image,  
  LeadRect searchBounds,  
  BarcodeSymbology symbology,  
  BarcodeReadOptions options 
)

 function Leadtools.Barcode.BarcodeReader.ReadBarcode(RasterImage,LogicalRectangle,BarcodeSymbology,BarcodeReadOptions)(  
   image , 
   searchBounds , 
   symbology , 
   options  
)

public: 
Leadtools.Barcode.BarcodeData^ ReadBarcode(  
   Leadtools.RasterImage^ image, 
   Leadtools.Forms.LogicalRectangle searchBounds, 
   Leadtools.Barcode.BarcodeSymbology symbology, 
   Leadtools.Barcode.BarcodeReadOptions^ options 
)

Parameters

image
A RasterImage object that contains the image data. Must not be null (Nothing in VB).

searchBounds
A LogicalRectangle that specifies the region of interest area in the image where the barcode search and detection is performed. You can specify LogicalRectangle.Empty to indicate that the search must be performed on the whole image.

symbology
An BarcodeSymbology enumeration member that specifies the barcode symbology (type) to search for. You can pass BarcodeSymbology.Unknown to search for all available symbologies in this BarcodeReader.

options
An instance of a BarcodeReadOptions derived class that specifies the options to use.

Return Value

An instance of BarcodeData or one of its derived classes that contains the symbology, data, location, and any rotation angle of the barcode found. If no barcodes can be found, then this method will return null (Nothing in VB).

Remarks

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.

This method will use the options in options when reading the barcode. If this parameter is null (Nothing in VB), then the default options for symbology (or all default options if BarcodeSymbology.Unknown is specified) will be used instead.

If options is not null (Nothing in VB) and symbology is not BarcodeSymbology.Unknown, then it must contain a derived class of BarcodeReadOptions that supports symbology.

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 default or specific options. Use these methods if you want to read multiple barcodes of the same or multiple symbologies.