ReadBarcode(RasterImage,LeadRect,BarcodeSymbology) Method

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

public BarcodeData ReadBarcode( 
   RasterImage image,
   LeadRect searchBounds,
   BarcodeSymbology symbology
)

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

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

public BarcodeData ReadBarcode( 
   RasterImage image,
   LeadRect searchBounds,
   BarcodeSymbology symbology
)

ObjectiveC Syntax

 function Leadtools.Barcode.BarcodeReader.ReadBarcode(RasterImage,LeadRect,BarcodeSymbology)( 
   image ,
   searchBounds ,
   symbology 
)

public:
BarcodeData^ ReadBarcode( 
   RasterImage^ image,
   LeadRect searchBounds,
   BarcodeSymbology symbology
)

Parameters

image: A Leadtools.RasterImage object that contains the image data. Must not be null.
searchBounds: A Leadtools.LeadRect that specifies the region of interest area in the image where the barcode search and detection is performed. You can specify empty rectangle to indicate that the search must be performed on the whole image.
symbology: A 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.

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 Visual Basic).

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

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

Copy Code

[TestMethod]
public async Task BarcodeReader_ReadBarcodeExample1()
{
   string imageFileName = @"Assets\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())
   {
      StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(imageFileName);
      using(RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)))
      {
         // Read the QR barcode from this image
         BarcodeData barcode = reader.ReadBarcode(image, LeadRectHelper.Empty, BarcodeSymbology.QR);

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

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

Reference

BarcodeReader Class
BarcodeReader Members
Overload List