How to Use Barcode Scanners in C# Windows Apps

using IronBarCode;

Imports IronBarCode

// Open file dialog   
OpenFileDialog open = new OpenFileDialog();
// Image filters  
open.Filter = "Image Files(*.jpg; *.png; *.jpeg; *.gif; *.bmp)|*.jpg;*.png;*.jpeg;*.gif;*.bmp";
if (open.ShowDialog() == DialogResult.OK) {  
    // Display image in PictureBox
    pictureBox1.Image = new Bitmap(open.FileName); 
    // Store image file path in class data member. Initialize it as string ImageFileName;
    ImageFileName = open.FileName; 
}

' Open file dialog   
Dim open As New OpenFileDialog()
' Image filters  
open.Filter = "Image Files(*.jpg; *.png; *.jpeg; *.gif; *.bmp)|*.jpg;*.png;*.jpeg;*.gif;*.bmp"
If open.ShowDialog() = DialogResult.OK Then
	' Display image in PictureBox
	pictureBox1.Image = New Bitmap(open.FileName)
	' Store image file path in class data member. Initialize it as string ImageFileName;
	ImageFileName = open.FileName
End If

// Read the barcode from the image file path
BarcodeResult Result = BarcodeReader.Read(ImageFileName);
// Display the decoded text in TextBox
textBox1.Text = Result.Text;

' Read the barcode from the image file path
Dim Result As BarcodeResult = BarcodeReader.Read(ImageFileName)
' Display the decoded text in TextBox
textBox1.Text = Result.Text

// Define a collection of image filters to apply
var filtersToApply = new ImageFilterCollection() {
    new SharpenFilter(),
    new InvertFilter(),
    new ContrastFilter(),
    new BrightnessFilter(),
    new AdaptiveThresholdFilter(),
    new BinaryThresholdFilter()
};

// Configure barcode reader options with specified filters
BarcodeReaderOptions myOptionsExample = new BarcodeReaderOptions() {
    ImageFilters = filtersToApply,
    ExpectBarcodeTypes = BarcodeEncoding.QRCode | BarcodeEncoding.Code128,
};

// Read the barcode/QR code with custom options and display result
BarcodeResult Result = BarcodeReader.Read(ImageFileName, myOptionsExample);
textBox1.Text = Result.Text;

' Define a collection of image filters to apply
Dim filtersToApply = New ImageFilterCollection() From {
	New SharpenFilter(),
	New InvertFilter(),
	New ContrastFilter(),
	New BrightnessFilter(),
	New AdaptiveThresholdFilter(),
	New BinaryThresholdFilter()
}

' Configure barcode reader options with specified filters
Dim myOptionsExample As New BarcodeReaderOptions() With {
	.ImageFilters = filtersToApply,
	.ExpectBarcodeTypes = BarcodeEncoding.QRCode Or BarcodeEncoding.Code128
}

' Read the barcode/QR code with custom options and display result
Dim Result As BarcodeResult = BarcodeReader.Read(ImageFileName, myOptionsExample)
textBox1.Text = Result.Text

// Scan for multiple barcodes within a PDF document
BarcodeResult[] PDFResults = BarcodeReader.ReadPdf("MultipleBarcodes.pdf");

// Work with the results found
foreach (var PageResult in PDFResults) { 
    string Value = PageResult.Value;
    int PageNum = PageResult.PageNumber;
    System.Drawing.Bitmap Img = PageResult.BarcodeImage;
    BarcodeEncoding BarcodeType = PageResult.BarcodeType;
    byte[] Binary = PageResult.BinaryValue;
    Console.WriteLine(PageResult.Value + " on page " + PageNum);
}

' Scan for multiple barcodes within a PDF document
Dim PDFResults() As BarcodeResult = BarcodeReader.ReadPdf("MultipleBarcodes.pdf")

' Work with the results found
For Each PageResult In PDFResults
	Dim Value As String = PageResult.Value
	Dim PageNum As Integer = PageResult.PageNumber
	Dim Img As System.Drawing.Bitmap = PageResult.BarcodeImage
	Dim BarcodeType As BarcodeEncoding = PageResult.BarcodeType
	Dim Binary() As Byte = PageResult.BinaryValue
	Console.WriteLine(PageResult.Value & " on page " & PageNum)
Next PageResult

// Small or 'Thumbnail' barcode images are automatically detected by IronBarCode and corrected for wherever possible even if they have much digital noise.
BarcodeResult SmallResult = BarcodeReader.Read("ThumbnailOfBarcode.gif");

' Small or 'Thumbnail' barcode images are automatically detected by IronBarCode and corrected for wherever possible even if they have much digital noise.
Dim SmallResult As BarcodeResult = BarcodeReader.Read("ThumbnailOfBarcode.gif")