C# 分隔PDF文件无损耗转图片

C# 分隔PDF文件无损耗转图片

using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using ImageMagick;
using ImageMagick.Defines;
using ImageMagick.ImageOptimizers;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace WpfApplication1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {

        }

        String OriginalDirectory = ConfigurationManager.AppSettings["OriginalDirectory"].ToString();

        String BackupDirectory = ConfigurationManager.AppSettings["BackupDirectory"].ToString();

        String TargetDirectory = ConfigurationManager.AppSettings["TargetDirectory"].ToString();

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (!Directory.Exists(OriginalDirectory))
            {
                Directory.CreateDirectory(OriginalDirectory);
            }
            if (!Directory.Exists(BackupDirectory))
            {
                Directory.CreateDirectory(BackupDirectory);
            }
            if (!Directory.Exists(TargetDirectory))
            {
                Directory.CreateDirectory(TargetDirectory);
            }
            List<String> waitFilePaths = Directory.GetFiles(OriginalDirectory,"*.pdf").ToList();
            Task<Func<List<String>, int>> t1 = new Task<Func<List<String>, int>>((paraTransferTask) =>
            {
                List<String> FilePaths = paraTransferTask as List<String>;
                for (int c = 0; c < FilePaths.Count; c++)
                { 
                    ExtractPage(FilePaths[c]);

                    System.Windows.Threading.Dispatcher dispatcher = System.Windows.Application.Current.Dispatcher;
                    dispatcher.Invoke(new System.Action(() =>
                    {
                        labPDF2Image.Content = String.Format("共{0}个文件，已转换{1}个文件.", FilePaths.Count, c+1);
                    }), System.Windows.Threading.DispatcherPriority.Background);
                }
                return new Func<List<String>, int>((y) => { return 0; });
            }
            , waitFilePaths
            , TaskCreationOptions.LongRunning);
            t1.Start();
        }

        public void ExtractPage(string sourcePdfPath)
        {
            try
            {
                PdfReader reader = new PdfReader(sourcePdfPath);
                int pages = reader.NumberOfPages;
                for (int i = 1; i <= pages; i++)
                {
                    Document document = new Document(reader.GetPageSizeWithRotation(i));
                    string pdfDir = System.IO.Path.GetDirectoryName(sourcePdfPath);
                    string pdfName = System.IO.Path.GetFileNameWithoutExtension(sourcePdfPath);
                    string ext = System.IO.Path.GetExtension(sourcePdfPath);
                    String outputPdfPath = System.IO.Path.Combine(TargetDirectory, string.Concat(pdfName, "_", i.ToString().PadLeft(3, '0'), ext));
                    PdfCopy pdfCopyProvider = new PdfCopy(document, new System.IO.FileStream(outputPdfPath, System.IO.FileMode.Create));
                    document.Open();
                    PdfImportedPage importedPage = pdfCopyProvider.GetImportedPage(reader, i);
                    pdfCopyProvider.AddPage(importedPage);
                    document.Close();
                    String targetJpg = System.IO.Path.Combine(TargetDirectory, string.Concat(pdfName, "_", i.ToString().PadLeft(3, '0'), ".jpg"));
                    MagickReadSettings settings = new MagickReadSettings();
                    settings.Density = new Density(300);
                    using (MagickImageCollection images = new MagickImageCollection())
                    {
                        images.Read(outputPdfPath, settings);
                        int xx = images.Count();
                        for (int img = 0; img < xx; img++)
                        {
                            MagickImage image = images[img];
                            image.Format = MagickFormat.Jpeg;
                            image.Quality = 100;
                            //image.Density = new Density(300);
                            image.CompressionMethod = CompressionMethod.LosslessJPEG;
                            image.Write(targetJpg);
                        }
                    }
                    File.Delete(outputPdfPath);
                }
                reader.Close();
                string backupPath = sourcePdfPath.Replace(OriginalDirectory,BackupDirectory);
                File.Copy(sourcePdfPath, backupPath);
                File.Delete(sourcePdfPath);
            }
            catch (Exception ex)
            {
                IOExtention.WriteLog("pdf2img_",ex.Message);
                throw ex;
            }
        }

        public void ExtractPages(string sourcePdfPath, string outputPdfPath, int startPage, int endPage)
        {
            PdfReader reader = null;
            Document sourceDocument = null;
            PdfCopy pdfCopyProvider = null;
            PdfImportedPage importedPage = null;
            try
            {
                // Intialize a new PdfReader instance with the contents of the source Pdf file:
                reader = new PdfReader(sourcePdfPath);
                // For simplicity, I am assuming all the pages share the same size
                // and rotation as the first page:
                sourceDocument = new Document(reader.GetPageSizeWithRotation(startPage));
                // Initialize an instance of the PdfCopyClass with the source 
                // document and an output file stream:
                pdfCopyProvider = new PdfCopy(sourceDocument,
                    new System.IO.FileStream(outputPdfPath, System.IO.FileMode.Create));
                sourceDocument.Open();
                // Walk the specified range and add the page copies to the output file:
                for (int i = startPage; i <= endPage; i++)
                {
                    importedPage = pdfCopyProvider.GetImportedPage(reader, i);
                    pdfCopyProvider.AddPage(importedPage);
                }
                sourceDocument.Close();
                reader.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public void ExtractPages(string sourcePdfPath, string outputPdfPath, int[] extractThesePages)
        {
            PdfReader reader = null;
            Document sourceDocument = null;
            PdfCopy pdfCopyProvider = null;
            PdfImportedPage importedPage = null;
            try
            {
                // Intialize a new PdfReader instance with the 
                // contents of the source Pdf file:
                reader = new PdfReader(sourcePdfPath);
                // For simplicity, I am assuming all the pages share the same size
                // and rotation as the first page:
                sourceDocument = new Document(reader.GetPageSizeWithRotation(extractThesePages[0]));
                // Initialize an instance of the PdfCopyClass with the source 
                // document and an output file stream:
                pdfCopyProvider = new PdfCopy(sourceDocument,
                    new System.IO.FileStream(outputPdfPath, System.IO.FileMode.Create));
                sourceDocument.Open();
                // Walk the array and add the page copies to the output file:
                foreach (int pageNumber in extractThesePages)
                {
                    importedPage = pdfCopyProvider.GetImportedPage(reader, pageNumber);
                    pdfCopyProvider.AddPage(importedPage);
                }
                sourceDocument.Close();
                reader.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static List<string> GetFilePaths(string path, List<string> list)
        {
            DirectoryInfo dir = new DirectoryInfo(path);
            FileInfo[] fil = dir.GetFiles();
            DirectoryInfo[] dii = dir.GetDirectories();
            foreach (FileInfo f in fil)
            {
                list.Add(f.FullName);
            }
            foreach (DirectoryInfo d in dii)
            {
                GetFilePaths(d.FullName, list);
            }
            return list;
        }
    }
}