Question

我有一个特定的要求，即从pdf文件中的特定区域中提取文本和图像。该区域可能是选定的或突出显示的，也可能来自给定的坐标集。

当我经历时，所有方法都是完全从PDF中提取图像和文本而不是在指定位置。我尝试使用iTextSharp，Syncfussion，Apose，但无法找到更好的方法。

如果有人可以帮助我，那将是非常好的。您能否分享一下如何在.net中实现这一点的想法和建议。

此致 Arun.M

Answer 1

此代码从pdf中提取图像

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Drawing.Imaging;
using System.IO;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Bytescout.PDFExtractor;

namespace ExtractAllImages
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            // This test file will be copied to the project directory on the pre-build event (see the project properties).
            String inputFile = Server.MapPath("sample1.pdf");

            // Create Bytescout.PDFExtractor.ImageExtractor instance
            ImageExtractor extractor = new ImageExtractor();
            extractor.RegistrationName = "demo";
            extractor.RegistrationKey = "demo";

            // Load sample PDF document
            extractor.LoadDocumentFromFile("sample1.pdf");

            Response.Clear();

            int i = 0;

            // Initialize image enumeration
            if (extractor.GetFirstImage())
            {
                do
                {
                    if (i == 0) // Write the fist image to the Response stream
                    {
                        string imageFileName = "image" + i + ".png";

                        Response.Write("<b>" + imageFileName + "</b>");

                        Response.ContentType = "image/png";
                        Response.AddHeader("Content-Disposition", "inline;filename=" + imageFileName);

                        // Write the image bytes into the Response output stream
                        Response.BinaryWrite(extractor.GetCurrentImageAsArrayOfBytes());
                    }

                    i++;

                } while (extractor.GetNextImage()); // Advance image enumeration
            }

            Response.End();
        }
    }
}

从选定区域或坐标中的pdf中提取文本和图像

1 个答案: