Read Barcodes Asynchronously
We can read barcodes using the BarcodeReader class. The easiest method to use is the BarcodeReader.Read method. IronBarcode also has a ReadAsync method for multithreaded asynchronous programming.
Below is an example of how to use the BarcodeReader class to read a barcode from an image file. The code also demonstrates how to utilize some options from BarcodeReaderOptions to optimize the barcode reading process.
// Import the necessary namespace for IronBarcode
using IronBarCode;
using System.Threading.Tasks;// Import the necessary namespace for IronBarcode
using IronBarCode;
using System.Threading.Tasks;' Import the necessary namespace for IronBarcode
Imports IronBarCode
Imports System.Threading.Tasks$vbLabelText $csharpLabel
// Define a static class to contain our barcode reading functionality
public static class BarcodeReaderExample
{
// Synchronously read and decode a barcode from an image file
public static void ReadBarcodeFromFile(string filePath)
{
// Create a new BarcodeReader instance with default settings
BarcodeReader reader = new BarcodeReader();
// Customize reading options for better performance or accuracy
BarcodeReaderOptions options = new BarcodeReaderOptions
{
ExpectMultipleBarcodes = false, // Set to true if expecting multiple barcodes in a single image
EnhanceAccuracy = true, // Enable enhanced accuracy, may slow down reading speed
SpeedUp = false // Disable speed optimization for more accurate readings
};
// Read the barcode from the file using specified options
BarcodeResult result = reader.Read(filePath, options);
// Check if a barcode was found
if (result != null && result.Success)
{
// Output the barcode value and format to the console
Console.WriteLine($"Barcode found: {result.Text} with format {result.Format}");
}
else
{
Console.WriteLine("No barcode was detected in the image.");
}
}
// Asynchronously read and decode a barcode from an image file
public static async Task ReadBarcodeFromFileAsync(string filePath)
{
// Create a new BarcodeReader instance
BarcodeReader reader = new BarcodeReader();
// Customize reading options for the asynchronous read
BarcodeReaderOptions options = new BarcodeReaderOptions
{
ExpectMultipleBarcodes = false,
EnhanceAccuracy = true,
SpeedUp = true // Enable speed optimization for faster readings in async scenarios
};
// Asynchronously read the barcode from the file
BarcodeResult result = await reader.ReadAsync(filePath, options);
// Check if a barcode was found
if (result != null && result.Success)
{
// Output the barcode value and format to the console
Console.WriteLine($"Asynchronously found barcode: {result.Text} with format {result.Format}");
}
else
{
Console.WriteLine("No barcode was detected in the image during async reading.");
}
}
}// Define a static class to contain our barcode reading functionality
public static class BarcodeReaderExample
{
// Synchronously read and decode a barcode from an image file
public static void ReadBarcodeFromFile(string filePath)
{
// Create a new BarcodeReader instance with default settings
BarcodeReader reader = new BarcodeReader();
// Customize reading options for better performance or accuracy
BarcodeReaderOptions options = new BarcodeReaderOptions
{
ExpectMultipleBarcodes = false, // Set to true if expecting multiple barcodes in a single image
EnhanceAccuracy = true, // Enable enhanced accuracy, may slow down reading speed
SpeedUp = false // Disable speed optimization for more accurate readings
};
// Read the barcode from the file using specified options
BarcodeResult result = reader.Read(filePath, options);
// Check if a barcode was found
if (result != null && result.Success)
{
// Output the barcode value and format to the console
Console.WriteLine($"Barcode found: {result.Text} with format {result.Format}");
}
else
{
Console.WriteLine("No barcode was detected in the image.");
}
}
// Asynchronously read and decode a barcode from an image file
public static async Task ReadBarcodeFromFileAsync(string filePath)
{
// Create a new BarcodeReader instance
BarcodeReader reader = new BarcodeReader();
// Customize reading options for the asynchronous read
BarcodeReaderOptions options = new BarcodeReaderOptions
{
ExpectMultipleBarcodes = false,
EnhanceAccuracy = true,
SpeedUp = true // Enable speed optimization for faster readings in async scenarios
};
// Asynchronously read the barcode from the file
BarcodeResult result = await reader.ReadAsync(filePath, options);
// Check if a barcode was found
if (result != null && result.Success)
{
// Output the barcode value and format to the console
Console.WriteLine($"Asynchronously found barcode: {result.Text} with format {result.Format}");
}
else
{
Console.WriteLine("No barcode was detected in the image during async reading.");
}
}
}' Define a static class to contain our barcode reading functionality
Public Module BarcodeReaderExample
' Synchronously read and decode a barcode from an image file
Public Sub ReadBarcodeFromFile(ByVal filePath As String)
' Create a new BarcodeReader instance with default settings
Dim reader As New BarcodeReader()
' Customize reading options for better performance or accuracy
Dim options As New BarcodeReaderOptions With {
.ExpectMultipleBarcodes = False,
.EnhanceAccuracy = True,
.SpeedUp = False
}
' Read the barcode from the file using specified options
Dim result As BarcodeResult = reader.Read(filePath, options)
' Check if a barcode was found
If result IsNot Nothing AndAlso result.Success Then
' Output the barcode value and format to the console
Console.WriteLine($"Barcode found: {result.Text} with format {result.Format}")
Else
Console.WriteLine("No barcode was detected in the image.")
End If
End Sub
' Asynchronously read and decode a barcode from an image file
Public Async Function ReadBarcodeFromFileAsync(ByVal filePath As String) As Task
' Create a new BarcodeReader instance
Dim reader As New BarcodeReader()
' Customize reading options for the asynchronous read
Dim options As New BarcodeReaderOptions With {
.ExpectMultipleBarcodes = False,
.EnhanceAccuracy = True,
.SpeedUp = True
}
' Asynchronously read the barcode from the file
Dim result As BarcodeResult = Await reader.ReadAsync(filePath, options)
' Check if a barcode was found
If result IsNot Nothing AndAlso result.Success Then
' Output the barcode value and format to the console
Console.WriteLine($"Asynchronously found barcode: {result.Text} with format {result.Format}")
Else
Console.WriteLine("No barcode was detected in the image during async reading.")
End If
End Function
End Module$vbLabelText $csharpLabel
Key Points:
Synchronous vs Asynchronous Methods:
Readmethod is straightforward for use when immediate results are needed and is called on the main thread.ReadAsyncmethod is for asynchronous execution, allowing the program to continue with other tasks while waiting for the barcode reading to complete.
- BarcodeReaderOptions:
ExpectMultipleBarcodes: If set totrue, the reader will look for multiple barcodes in the image.EnhanceAccuracy: Improves accuracy at the cost of speed.SpeedUp: Increases reading efficiency, which might be useful for processing large numbers of images quickly. However, this might reduce accuracy if set totrue.
