Itext7使用及Spire.OCR使用

Itext7使用

 using (PdfReader reader = new PdfReader(urlBJ))
                        {
                            using (PdfDocument pdfDocument = new PdfDocument(reader))
                            {
                                IEventListener strategy = new ImageRenderListener(imageFileName);
                                PdfCanvasProcessor parser = new PdfCanvasProcessor(strategy);
                                for (var i = 1; i <= pdfDocument.GetNumberOfPages(); i++)
                                {
                                    try
                                    {
                                        if (File.Exists(imageFileName))
                                        {
                                            File.Delete(imageFileName);
                                        }
                                        parser.ProcessPageContent(pdfDocument.GetPage(i));
                                        
                                        image.Dispose();
                                    }
                                    catch (Exception ex)
                                    {
                                        MessageBox.Show(ex.Message);
                                    }

                                }
                              

                            }
                        }

　　Spire.OCR使用

Image image = Image.FromFile(imageFileName);
                                        Bitmap bmp = new Bitmap(image);
                                        MemoryStream memoryStream = new MemoryStream();
                                        bmp.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Jpeg);
                                        OcrScanner ocrScanner = new OcrScanner();
                                        System.Diagnostics.Stopwatch stopwatch = System.Diagnostics.Stopwatch.StartNew();
                                        OCRImageFormat imageFormat;
                                        Enum.TryParse(System.Drawing.Imaging.ImageFormat.Jpeg.ToString(), true, out imageFormat);
                                        bool result = ocrScanner.Scan(memoryStream, imageFormat);
                                        if (result)
                                        {
                                            string name = ocrScanner.Text.ToString();
                                            if (ocrScanner.Text.ToString().Contains("图纸名称"))
                                            {
                                                if (string.IsNullOrEmpty(UrlPage))
                                                {
                                                    UrlPage = i.ToString()+",";
                                                }
                                                else
                                                {
                                                    UrlPage= UrlPage+i.ToString()+",";
                                                }
                                            }
                                        }
                                        image.Dispose();