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using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas.Parser;
using iText.Kernel.Pdf.Canvas.Parser.Listener;
using iText.Kernel.Pdf.Xobject;
using OpenCvSharp;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Forms;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Image = System.Drawing.Image;
using Path = System.IO.Path;
using Window = System.Windows.Window;
// see huggingface\ExtractPdfImage\ExportPdfImage\ExportPDFImage.xaml.cs
namespace WpfEditor
{
/// <summary>
/// Interaction logic for ExportPDFImage.xaml
/// </summary>
public partial class ExportPDFImage : Window
{
private string pdfFilePath = "";
private string outputFolderPath = "";
public ExportPDFImage()
{
InitializeComponent();
}
private void btnSelectPdf_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog()
{
Filter = "PDF文件|*.pdf",
Title = "选择PDF文件"
};
if (openFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
pdfFilePath = openFileDialog.FileName;
txtPdfPath.Text = pdfFilePath;
lblStatus.Content = "状态：已选择PDF文件";
}
}
private void btnSelectOutputFolder_Click(object sender, RoutedEventArgs e)
{
FolderBrowserDialog folderBrowserDialog = new FolderBrowserDialog()
{
Description = "选择图片输出文件夹"
};
if (folderBrowserDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
outputFolderPath = folderBrowserDialog.SelectedPath;
txtOutputPath.Text = outputFolderPath;
lblStatus.Content = "状态：已选择输出文件夹";
}
}
private async void btnExtractImages_Click(object sender, RoutedEventArgs e)
{
if (string.IsNullOrEmpty(pdfFilePath))
{
System.Windows.MessageBox.Show("请先选择PDF文件！", "提示", MessageBoxButton.OK, MessageBoxImage.Warning);
return;
}
if (string.IsNullOrEmpty(outputFolderPath))
{
System.Windows.MessageBox.Show("请先选择输出文件夹！", "提示", MessageBoxButton.OK, MessageBoxImage.Warning);
return;
}
btnExtractImages.IsEnabled = false;
listBoxImages.Items.Clear();
progressBar.Value = 0;
lblStatus.Content = "状态：正在提取图片...";
try
{
await Task.Run(() => ExtractImagesFromPdf());
lblStatus.Content = "状态：图片提取完成！";
System.Windows.MessageBox.Show("图片提取完成！", "成功", MessageBoxButton.OK, MessageBoxImage.Information);
}
catch (Exception ex)
{
lblStatus.Content = "状态：提取失败";
System.Windows.MessageBox.Show($"提取图片时发生错误：{ex.Message}", "错误", MessageBoxButton.OK, MessageBoxImage.Error);
}
finally
{
btnExtractImages.IsEnabled = true;
progressBar.Value = 0;
}
}
private void ExtractImagesFromPdf()
{
using (PdfReader reader = new PdfReader(pdfFilePath))
using (PdfDocument pdfDoc = new PdfDocument(reader))
{
int totalPages = pdfDoc.GetNumberOfPages();
int imageCount = 0;
for (int pageNumber = 1; pageNumber <= totalPages; pageNumber++)
{
Dispatcher.Invoke(() =>
{
progressBar.Value = (int)((double)pageNumber / totalPages * 100);
lblStatus.Content = $"状态：正在处理第 {pageNumber}/{totalPages} 页...";
});
PdfPage page = pdfDoc.GetPage(pageNumber);
PdfDictionary pageDict = page.GetPdfObject();
PdfDictionary resources = pageDict.GetAsDictionary(PdfName.Resources);
if (resources != null)
{
PdfDictionary xObjects = resources.GetAsDictionary(PdfName.XObject);
if (xObjects != null)
{
foreach (PdfName name in xObjects.KeySet())
{
PdfObject obj = xObjects.Get(name);
if (obj.IsStream())
{
PdfStream stream = (PdfStream)obj;
PdfObject subtype = stream.Get(PdfName.Subtype);
if (subtype != null && subtype.Equals(PdfName.Image))
{
try
{
imageCount++;
string imageName = $"{pageNumber:D4}";
string imagePath = Path.Combine(outputFolderPath, imageName);
ExtractImage(stream, imagePath);
Dispatcher.Invoke(() =>
{
listBoxImages.Items.Add($"已提取：{imageName}");
});
}
catch (Exception ex)
{
Dispatcher.Invoke(() =>
{
listBoxImages.Items.Add($"提取失败：第{pageNumber}页图片 - {ex.Message}");
});
}
}
}
}
}
}
}
Dispatcher.Invoke(() =>
{
lblStatus.Content = $"状态：完成！共提取 {imageCount} 张图片";
});
}
}
private void ExtractImage(PdfStream stream, string imagePath)
{
byte[] bts = stream.GetBytes();
Mat img = Cv2.ImDecode(bts, ImreadModes.Color);
Cv2.ImWrite(imagePath + ".jpg", img);
return;
PdfObject filter = stream.Get(PdfName.Filter);
if (filter != null)
{
if (filter.Equals(PdfName.DCTDecode)) // JPEG
{
File.WriteAllBytes(imagePath + ".jpg", stream.GetBytes());
}
else if (filter.Equals(PdfName.JPXDecode)) // JPEG2000
{
File.WriteAllBytes(imagePath + ".jp2", stream.GetBytes());
}
else
{
}
}
else
{
File.WriteAllBytes(imagePath + ".raw", stream.GetBytes());
}
}
}
} |