VintaSoft Barcode .NET SDK v10.0
Vintasoft.WpfBarcode Namespace / BarcodeReader Class / ReadBarcodes Method / ReadBarcodes(Stream) Method
The stream that contains image.
Example




In This Topic
    ReadBarcodes(Stream) Method
    In This Topic
    Reads barcodes from the specified stream.
    Syntax
    'Declaration
     
    Public Overloads Function ReadBarcodes( _
       ByVal stream As Stream _
    ) As IBarcodeInfo()
    'Usage
     
    Dim instance As BarcodeReader
    Dim stream As Stream
    Dim value() As IBarcodeInfo
     
    value = instance.ReadBarcodes(stream)
    public IBarcodeInfo[] ReadBarcodes( 
       Stream stream
    )
    public: IBarcodeInfo*[]* ReadBarcodes( 
       Stream* stream
    ) 
    public:
    array<IBarcodeInfo^>^ ReadBarcodes( 
       Stream^ stream
    ) 

    Parameters

    stream
    The stream that contains image.

    Return Value

    An array of IBarcodeInfo objects which contains information about recognized barcodes.
    Example
    Here is a simple example that demonstrates how to detect barcodes in an image.
    Imports System.IO   
       
    Imports Vintasoft.WpfBarcode   
    Imports Vintasoft.WpfBarcode.SymbologySubsets   
       
    ''' <summary>   
    ''' Test that shows how read barcodes from image,   
    ''' which is stored in stream, using the BarcodeReader class.   
    ''' </summary>   
    Class ReadBarcodesFromStreamExample   
    	''' <summary>   
    	''' Runs the test.   
    	''' </summary>   
    	Public Shared Sub Test()   
    		' open the stream   
    		Using barcodeImageStream As Stream = New FileStream("test1.jpg", FileMode.Open, FileAccess.Read)   
    			' read barcodes from image, which is stored in stream   
    			ReadBarcodes(barcodeImageStream)   
    		End Using   
    	End Sub   
       
    	''' <summary>   
    	''' Reads barcodes from image, which is stored in stream.   
    	''' </summary>   
    	Private Shared Sub ReadBarcodes(stream As Stream)   
    		' create barcode reader   
    		Using reader As New BarcodeReader()   
    			' specify that reader must search for Code39, Code39Extended,    
    			' Code128, SSCC18 and DataMatrix barcodes    
    			reader.Settings.ScanBarcodeTypes = BarcodeType.Code39 Or BarcodeType.Code128 Or BarcodeType.DataMatrix   
    			reader.Settings.ScanBarcodeSubsets.Add(BarcodeSymbologySubsets.Code39Extended)   
    			reader.Settings.ScanBarcodeSubsets.Add(BarcodeSymbologySubsets.SSCC18)   
       
    			' specify that reader must search for horizontal and vertical barcodes only   
    			reader.Settings.ScanDirection = ScanDirection.LeftToRight Or ScanDirection.RightToLeft   
       
    			' use Automatic Recognition   
    			reader.Settings.AutomaticRecognition = True   
       
    			' read barcodes from image stored in stream   
    			Dim infos As IBarcodeInfo() = reader.ReadBarcodes(stream)   
       
    			' show barcode recognition results   
       
    			Console.WriteLine(String.Format("Recognition time {0} ms.", reader.RecognizeTime.TotalMilliseconds))   
       
    			If infos.Length = 0 Then   
    				Console.WriteLine("No barcodes found.")   
    			Else   
    				Console.WriteLine(String.Format("{0} barcodes found:", infos.Length))   
    				Console.WriteLine()   
    				For i As Integer = 0 To infos.Length - 1   
    					Dim info As IBarcodeInfo = infos(i)   
    					Console.WriteLine(String.Format("[{0}:{1}]", i, info.BarcodeType))   
    					Console.WriteLine(String.Format("Value:      {0}", info.Value))   
    					Console.WriteLine(String.Format("Confidence: {0}%", Math.Round(info.Confidence)))   
    					Console.WriteLine(String.Format("Threshold:  {0}", info.Threshold))   
    					Console.WriteLine(String.Format("Region:     {0}", info.Region))   
    					Console.WriteLine()   
    				Next   
    			End If   
    		End Using   
    	End Sub   
       
    End Class
    using System;
    using System.IO;
                
    using Vintasoft.WpfBarcode;
    using Vintasoft.WpfBarcode.SymbologySubsets;
                
    /// <summary>
    /// Test that shows how read barcodes from image,
    /// which is stored in stream, using the BarcodeReader class.
    /// </summary>
    class ReadBarcodesFromStreamExample
    {
        /// <summary>
        /// Runs the test.
        /// </summary>
        public static void Test()
        {
            // open the stream
            using (Stream barcodeImageStream = new FileStream("test1.jpg", FileMode.Open, FileAccess.Read))
            {
                // read barcodes from image, which is stored in stream
                ReadBarcodes(barcodeImageStream);
            }
        }
                
        /// <summary>
        /// Reads barcodes from image, which is stored in stream.
        /// </summary>
        static void ReadBarcodes(Stream stream)
        {
            // create barcode reader
            using (BarcodeReader reader = new BarcodeReader())
            {
                // specify that reader must search for Code39, Code39Extended, 
                // Code128, SSCC18 and DataMatrix barcodes 
                reader.Settings.ScanBarcodeTypes =
                    BarcodeType.Code39 |
                    BarcodeType.Code128 |
                    BarcodeType.DataMatrix;
                reader.Settings.ScanBarcodeSubsets.Add(BarcodeSymbologySubsets.Code39Extended);
                reader.Settings.ScanBarcodeSubsets.Add(BarcodeSymbologySubsets.SSCC18);
                
                // specify that reader must search for horizontal and vertical barcodes only
                reader.Settings.ScanDirection = ScanDirection.LeftToRight | ScanDirection.RightToLeft;
                
                // use Automatic Recognition
                reader.Settings.AutomaticRecognition = true;
                
                // read barcodes from image stored in stream
                IBarcodeInfo[] infos = reader.ReadBarcodes(stream);
                
                // show barcode recognition results
                
                Console.WriteLine(string.Format("Recognition time {0} ms.",
                    reader.RecognizeTime.TotalMilliseconds));
                
                if (infos.Length == 0)
                {
                    Console.WriteLine("No barcodes found.");
                }
                else
                {
                    Console.WriteLine(string.Format("{0} barcodes found:", infos.Length));
                    Console.WriteLine();
                    for (int i = 0; i < infos.Length; i++)
                    {
                        IBarcodeInfo info = infos[i];
                        Console.WriteLine(string.Format("[{0}:{1}]", i, info.BarcodeType));
                        Console.WriteLine(string.Format("Value:      {0}", info.Value));
                        Console.WriteLine(string.Format("Confidence: {0}%", Math.Round(info.Confidence)));
                        Console.WriteLine(string.Format("Threshold:  {0}", info.Threshold));
                        Console.WriteLine(string.Format("Region:     {0}", info.Region));
                        Console.WriteLine();
                    }
                }
            }
        }
                
    }
    Requirements

    Target Platforms: Windows 8, Windows 7, Windows Vista, Windows XP, Windows Server 2012, Windows Server 2008, Windows Server 2003

    See Also