/// <summary>
/// Extracts text fragments from the 3rd page and highlights the glyphs in the fragment.
/// </summary>
/// <param name="document"></param>
private static void ExtractImagesAndHighlight(PDFFixedDocument document)
{
PDFPen pen = new PDFPen(new PDFRgbColor(255, 0, 192), 0.5);
PDFBrush brush = new PDFBrush(new PDFRgbColor(0, 0, 0));
PDFStandardFont helvetica = new PDFStandardFont(PDFStandardFontFace.Helvetica, 8);
PDFStringAppearanceOptions sao = new PDFStringAppearanceOptions();
sao.Brush = brush;
sao.Font = helvetica;
PDFStringLayoutOptions slo = new PDFStringLayoutOptions();
slo.Width = 1000;
PDFContentExtractor ce = new PDFContentExtractor(document.Pages[2]);
PDFVisualImageCollection eic = ce.ExtractImages(false);
for (int i = 0; i < eic.Count; i++)
{
string imageProperties = string.Format("Image ID: {0}\nPixel width: {1} pixels\nPixel height: {2} pixels\n" +
"Display width: {3} points\nDisplay height: {4} points\nHorizonal Resolution: {5} dpi\nVertical Resolution: {6} dpi",
eic[i].ImageID, eic[i].Width, eic[i].Height, eic[i].DisplayWidth, eic[i].DisplayHeight, eic[i].DpiX, eic[i].DpiY);
PDFPath boundingPath = new PDFPath();
boundingPath.StartSubpath(eic[i].ImageCorners[0].X, eic[i].ImageCorners[0].Y);
boundingPath.AddLineTo(eic[i].ImageCorners[1].X, eic[i].ImageCorners[1].Y);
boundingPath.AddLineTo(eic[i].ImageCorners[2].X, eic[i].ImageCorners[2].Y);
boundingPath.AddLineTo(eic[i].ImageCorners[3].X, eic[i].ImageCorners[3].Y);
boundingPath.CloseSubpath();
document.Pages[2].Canvas.DrawPath(pen, boundingPath);
slo.X = eic[i].ImageCorners[3].X + 1;
slo.Y = eic[i].ImageCorners[3].Y + 1;
document.Pages[2].Canvas.DrawString(imageProperties, sao, slo);
}
}
static void Main(string[] args)
{
// Load the PDF file.
//PDF4NET v5: PDFDocument doc = new PDFDocument("..\\SupportFiles\\Images.pdf");
PDFFixedDocument doc = new PDFFixedDocument("..\\..\\..\\..\\..\\SupportFiles\\content.pdf");
//for (int i = 0; i < doc.Pages.Count; i++)
//{
// Convert the pages to PDFImportedPage to get access to ExtractImages method.
//PDF4NET v5: PDFImportedPage ip = doc.Pages[i] as PDFImportedPage;
PDFContentExtractor ce = new PDFContentExtractor(doc.Pages[2]);
//PDF4NET v5: Bitmap[] images = ip.ExtractImages();
PDFVisualImageCollection images = ce.ExtractImages(true);
// Save the page images to disk, if there are any.
for (int j = 0; j < images.Count; j++)
{
//PDF4NET v5: images[j].Save("image" + i.ToString() + j.ToString() + ".png", ImageFormat.Png);
FileStream fs = File.OpenWrite("image" + j.ToString() + ".png");
images[j].Save(fs, PDFVisualImageSaveFormat.Png);
fs.Flush();
fs.Close();
}
//}
}