ReadBarcode(RasterImage,LeadRect,BarcodeSymbology[]) Method

C#
Visual Basic
WinRT C#
Java
Objective-C
WinRT JavaScript
C++

public BarcodeData ReadBarcode( 
   RasterImage image,
   LeadRect searchBounds,
   BarcodeSymbology[] symbologies
)

'Declaration

Public Overloads Function ReadBarcode( _
   ByVal image As RasterImage, _
   ByVal searchBounds As LeadRect, _
   ByVal symbologies() As BarcodeSymbology _
) As BarcodeData

'Usage

Dim instance As BarcodeReader
Dim image As RasterImage
Dim searchBounds As LeadRect
Dim symbologies() As BarcodeSymbology
Dim value As BarcodeData
 
value = instance.ReadBarcode(image, searchBounds, symbologies)

public BarcodeData ReadBarcode( 
   RasterImage image,
   LeadRect searchBounds,
   BarcodeSymbology[] symbologies
)

 function Leadtools.Barcode.BarcodeReader.ReadBarcode(RasterImage,LeadRect,BarcodeSymbology[])( 
   image ,
   searchBounds ,
   symbologies 
)

public:
BarcodeData^ ReadBarcode( 
   RasterImage^ image,
   LeadRect searchBounds,
   array<BarcodeSymbology>^ symbologies
)

Parameters

image: A RasterImage object that contains the image data. Must not be null.
searchBounds: A LeadRect that specifies the region of interest area in the image where the barcode search and detection is performed. Specify empty rectangle to indicate that the search must be performed on the whole image.
symbologies: An array of BarcodeSymbology enumeration members that specifies the barcode symbologies (types) to search for.

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.

Note: In LEADTOOLS for .NET, the equivalent to LeadRect is LogicalRectangle.

This example shows how to use this method to read any UPC barcode used to identify products from an image.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Barcode;
using Leadtools.ImageProcessing;

      
public async Task BarcodeReader_ReadBarcodeExample3()
{
   string imageFileName = @"Assets\Barcode1.tif";
   // Create a Barcode engine
   BarcodeEngine engine = new BarcodeEngine();

   // Get the Barcode reader instance
   BarcodeReader reader = engine.Reader;

   using(RasterCodecs codecs = new RasterCodecs())
   {
      StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(imageFileName);
      using(RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)))
      {
         // In the US, UPC barcodes are used to identity products. So, create an array of UPC symbologies
         BarcodeSymbology[] upcSymbologies =
         {
            BarcodeSymbology.UPCA,
            BarcodeSymbology.UPCE
         };

         // Read the first UPC barcode from the image
         BarcodeData barcode = reader.ReadBarcode(image, LeadRectHelper.Empty, upcSymbologies);

         // Show its location and data if found
         if(barcode != null)
         {
            Debug.WriteLine("Found a {0} barcode at {1}, data:\n{2}", barcode.Symbology, barcode.Bounds, barcode.Value);
         }
         else
         {
            Debug.WriteLine("Not found");
         }
      }
   }
}

Target Platforms

Reference

BarcodeReader Class
BarcodeReader Members
Overload List