public void SaveImages(Document document, string filename, List<int> pageNumbers, int compressionRate)
{
string directory = System.IO.Path.GetDirectoryName(filename);
string extension = System.IO.Path.GetExtension(filename);
System.Drawing.Imaging.ImageFormat format;
switch(extension.ToUpper())
{
case ".JPG":
{
format = System.Drawing.Imaging.ImageFormat.Jpeg;
}
break;
case ".GIF":
{
format = System.Drawing.Imaging.ImageFormat.Gif;
}
break;
case ".PNG":
{
format = System.Drawing.Imaging.ImageFormat.Png;
}
break;
case ".BMP":
{
format = System.Drawing.Imaging.ImageFormat.Bmp;
}
break;
default:
{
format = null;
}
break;
}
foreach(int num in pageNumbers)
{
Page page = document.GetPage(num);
Image image = page.GetImage();
if (format == null)
{
// Since the format is not specified use the native format from the image
format = image.RawFormat;
}
string saveName = page.Name;
if(pageNumbers.Count == 1)
{
saveName = System.IO.Path.GetFileNameWithoutExtension(filename);
}
SaveImage(image, format, directory, saveName, compressionRate);
}
}
public void SaveDocument(Document document, string filename, List<int> pageNumbers, bool append,
bool compressImage,
int compressionFactor,
bool importNativePages,
ResolutionDpi exportResolution)
{
IntPtr pdfDocument = LibPdfium.CreateNewDocument();
if(append && File.Exists(filename))
{
IntPtr sourceDoc = LibPdfium.LoadDocument(filename);
for(int i = 0; i < LibPdfium.GetPageCount(sourceDoc); i++)
{
LibPdfium.CopyPage(pdfDocument, sourceDoc, i + 1);
}
LibPdfium.CloseDocument(sourceDoc);
}
foreach(int num in pageNumbers)
{
// Get the current page from document
Page page = document.GetPage(num);
Image image = null;
if(page is PageFromPdf)
{
PageFromPdf pageFromPdf = page as PageFromPdf;
if(pageFromPdf.SingleImageMode)
{
image = pageFromPdf.GetSingleImage();
}
else if(importNativePages)
{
pageFromPdf.ExportToPdfDocument(pdfDocument);
}
else
{
image = pageFromPdf.Render(exportResolution);
}
}
else
{
image = page.GetSourceImage();
}
if(image != null)
{
if(compressImage)
{
image = CompressImage(image, compressionFactor, exportResolution);
}
DrawPage(pdfDocument, page, image);
}
}
// Save the document...
LibPdfium.SaveDocument(pdfDocument, filename);
}