Set Barcode Source
Overview
In Aspose.BarCode for .NET, a source for barcode recognition can be defined in three different ways: as an image file, as a stream, or as a bitmap. Reading barcodes from files can be done using five supported image formats: BMP, PNG, JPEG, GIF, or TIFF. The implementation details for three possible modes are provided further.
Read Barcodes from File
To set the barcode recognition source as an image file, it is necessary to specify the full or relative path to this file in the BarCodeReader constructor or call the SetBarCodeImage method to pass the path to the already existing object of BarCodeReader.
The following code snippet shows how to set the barcode reading source as a file by specifying the path to the required image.
using (BarCodeReader reader = new BarCodeReader($"{path}multiple_codes.png", DecodeType.Pdf417, DecodeType.DataMatrix, DecodeType.QR,
DecodeType.Code39Extended, DecodeType.Code128, DecodeType.RM4SCC))
{
Console.WriteLine("ReadFromFile:");
foreach (BarCodeResult result in reader.ReadBarCodes())
Console.WriteLine($"{result.CodeTypeName}:{result.CodeText}");
}
The code sample below illustrates how to define the path to the already created recognition source object.
using (BarCodeReader reader = new BarCodeReader())
{
//set path to image
reader.SetBarCodeImage($"{path}multiple_codes.png");
reader.SetBarCodeReadType(DecodeType.Pdf417, DecodeType.DataMatrix, DecodeType.QR, DecodeType.Code39Extended, DecodeType.Code128, DecodeType.RM4SCC);
Console.WriteLine("ReadSetBarCodeImageFromFile:");
foreach (BarCodeResult result in reader.ReadBarCodes())
Console.WriteLine($"{result.CodeTypeName}:{result.CodeText}");
}
Read Barcodes from Bitmap
In Aspose.BarCode for .NET, it is possible to get a barcode image for reading in the form of a graphical object, namely, a bitmap. IN the .NET framework, bitmap objects are used to process images composed of pixel data. To set the recognition source as a bitmap, it is necessary to pass the created bitmap object to the BarCodeReader constructor or the SetBarCodeImage method similarly to the case of using a raster image file.
using (Bitmap bmp = new Bitmap($"{path}multiple_codes.png"))
using (BarCodeReader reader = new BarCodeReader(bmp, DecodeType.Pdf417, DecodeType.DataMatrix, DecodeType.QR,
DecodeType.Code39Extended, DecodeType.Code128, DecodeType.RM4SCC))
{
Console.WriteLine("ReadFromBitmap:");
foreach (BarCodeResult result in reader.ReadBarCodes())
Console.WriteLine($"{result.CodeTypeName}:{result.CodeText}");
}
Read Barcodes from Stream
Aspose.BarCode for .NET enables the possibility to load the source barcode image from a stream (in a binary format) that is viewed as an abstraction of a byte sequence. In many cases, it may be convenient to set a recognition source as a stream object that is universal and can be accessed without a file system. In Aspose.BarCode for .NET, the source stream for barcode recognition can be passed to the BarCodeReader constructor or the SetBarCodeImage method.
The following code snippet explains how to set a source stream for barcode recognition.
using (Stream stream = new FileStream($"{path}multiple_codes.png", FileMode.Open, FileAccess.Read))
using (BarCodeReader reader = new BarCodeReader(stream, DecodeType.Pdf417, DecodeType.DataMatrix, DecodeType.QR,
DecodeType.Code39Extended, DecodeType.Code128, DecodeType.RM4SCC))
{
Console.WriteLine("ReadFromStream:");
foreach (BarCodeResult result in reader.ReadBarCodes())
Console.WriteLine($"{result.CodeTypeName}:{result.CodeText}");
}