Descubra se o PDF contém imagens ou texto

Contents
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Contexto

Um arquivo PDF pode conter tanto texto quanto imagens. Às vezes, um usuário pode precisar descobrir se um arquivo PDF contém apenas texto ou se contém apenas imagens. Também podemos descobrir se contém ambos ou nenhum.

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

    // Instantiate a memoryStream object to hold the extracted text from Document
    using (var ms = new MemoryStream())
    {
        // Create the PdfExtractor
        using (var extractor = new Aspose.Pdf.Facades.PdfExtractor())
        {
            // Bind PDF document
            extractor.BindPdf(dataDir + "FilledForm.pdf");
            // Extract text from the input PDF document
            extractor.ExtractText();
            // Save the extracted text to a text file
            extractor.GetText(ms);
            // Check if the MemoryStream length is greater than or equal to 1

            bool containsText = ms.Length >= 1;

            // Extract images from the input PDF document
            extractor.ExtractImage();

            // Calling HasNextImage method in while loop. When images will finish, loop will exit
            bool containsImage = extractor.HasNextImage();

            // Now find out whether this PDF is text only or image only

            if (containsText && !containsImage)
            {
                Console.WriteLine("PDF contains text only");
            }
            else if (!containsText && containsImage)
            {
                Console.WriteLine("PDF contains image only");
            }
            else if (containsText && containsImage)
            {
                Console.WriteLine("PDF contains both text and image");
            }
            else if (!containsText && !containsImage)
            {
                Console.WriteLine("PDF contains neither text or nor image");
            }
        }
    }
}