Mengonversi Halaman PDF ke Gambar dan Mengenali Kode Batang

Mengonversi Halaman ke Gambar dan Mengenali Kode Batang

Menggunakan Aspose.Pdf.Facades

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void IdentifyBarcodesConverter()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_DocumentConversion();

    // Create a PdfConverter object
    var converter = new Aspose.Pdf.Facades.PdfConverter();

    // Bind PDF document
    converter.BindPdf(dataDir + "IdentifyBarcodes.pdf");

    // Specify the start page to be processed
    converter.StartPage = 1;

    // Specify the end page for processing
    converter.EndPage = 1;

    // Create a Resolution object to specify the resolution of resultant image
    converter.Resolution = new Aspose.Pdf.Devices.Resolution(300);

    // Initialize the convertion process
    converter.DoConvert();

    // Create a MemoryStream object to hold the resultant image
    using (var imageStream = new MemoryStream())
    {
        // Check if pages exist and then convert to image one by one
        while (converter.HasNextImage())
        {
            // Save the image in the given image Format
            converter.GetNextImage(imageStream, System.Drawing.Imaging.ImageFormat.Png);

            // Set the stream position to the beginning of the stream
            imageStream.Position = 0;

            // Instantiate a BarCodeReader object
            var barcodeReader = new Aspose.BarCodeRecognition.BarCodeReader(imageStream, Aspose.BarCodeRecognition.BarCodeReadType.Code39Extended);

            // String txtResult.Text = "";
            while (barcodeReader.Read())
            {
                // Get the barcode text from the barcode image
                var code = barcodeReader.GetCodeText();

                // Write the barcode text to Console output
                Console.WriteLine("BARCODE : " + code);
            }

            // Close the BarCodeReader object to release the image file
            barcodeReader.Close();
        }

        // Close the PdfConverter instance and release the resources
        converter.Close();
    }
}

Menggunakan Kelas PngDevice

Di dalam Aspose.Pdf.Devices, terdapat PngDevice. Kelas ini memungkinkan Anda mengonversi halaman dalam dokumen PDF menjadi gambar PNG.

Untuk tujuan contoh ini, muat file PDF sumber ke dalam halaman dokumen dan ubah halaman tersebut menjadi gambar PNG. Ketika gambar telah dibuat, gunakan kelas BarCodeReader di bawah Aspose.BarCodeRecognition untuk mengidentifikasi dan membaca kode batang dalam gambar.

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void IdentifyBarcodes()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_DocumentConversion();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "IdentifyBarcodes.pdf"))
    {
        // Traverse through the individual pages of the PDF file
        for (int pageCount = 1; pageCount <= document.Pages.Count; pageCount++)
        {
            using (var imageStream = new MemoryStream())
            {
                // Create a Resolution object
                var resolution = new Aspose.Pdf.Devices.Resolution(300);

                // Instantiate a PngDevice object while passing a Resolution object as an argument to its constructor
                var pngDevice = new Aspose.Pdf.Devices.PngDevice(resolution);

                // Convert a particular page and save the image to stream
                pngDevice.Process(document.Pages[pageCount], imageStream);

                // Set the stream position to the beginning of Stream
                imageStream.Position = 0;

                // Instantiate a BarCodeReader object
                var barcodeReader = new Aspose.BarCodeRecognition.BarCodeReader(imageStream, Aspose.BarCodeRecognition.BarCodeReadType.Code39Extended);

                // String txtResult.Text = "";
                while (barcodeReader.Read())
                {
                    // Get the barcode text from the barcode image
                    var code = barcodeReader.GetCodeText();

                    // Write the barcode text to Console output
                    Console.WriteLine("BARCODE : " + code);
                }

                // Close the BarCodeReader object to release the image file
                barcodeReader.Close();
            }
        }
    }
}
Ekstrak Gambar dari PDF dan mengenali BarCode