/// <summary>
/// Select PDF page and returns page images as single image.
/// </summary>
public static BitmapSource SelectPdfPageImage(string filename, ref int pageIndex)
{
// create PdfImageViewer
PdfImageViewer viewer;
try
{
viewer = new PdfImageViewer(filename);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
return(null);
}
try
{
// collect pages with images
List <int> pageWithImages = new List <int>();
for (int i = 0; i < viewer.PageCount; i++)
{
string[] imageNames = viewer.GetImageNames(i);
if (imageNames.Length > 0)
{
pageWithImages.Add(i);
}
}
if (pageWithImages.Count == 0)
{
MessageBox.Show("Images in PDF file are not found.", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
return(null);
}
if (pageWithImages.Count > 1)
{
// select page
SelectPdfPageWindow selectPdfPageWindow = new SelectPdfPageWindow(pageWithImages.ToArray());
selectPdfPageWindow.ShowDialog();
pageIndex = pageWithImages[selectPdfPageWindow.pagesComboBox.SelectedIndex];
}
else
{
pageIndex = pageWithImages[0];
}
return(GetPdfPageImage(viewer, pageIndex));
}
finally
{
viewer.Dispose();
}
}
/// <summary>
/// Loads image from specified file.
/// </summary>
private BitmapSource LoadImage(string filename, ref int pageIndex)
{
if (_imageFileStream != null)
{
_imageFileStream.Dispose();
_imageFileStream = null;
}
string fileExt = System.IO.Path.GetExtension(filename).ToUpper();
switch (fileExt)
{
// PDF file
case ".PDF":
if (BarcodeGlobalSettings.IsDemoVersion)
{
MessageBox.Show("Evaluation version allows to extract images only from the first page of PDF document.", "Warning", MessageBoxButton.OK, MessageBoxImage.Warning);
}
if (pageIndex == -1)
{
return(SelectPdfPageWindow.SelectPdfPageImage(filename, ref pageIndex));
}
else
{
return(SelectPdfPageWindow.GetPdfPageImage(filename, pageIndex));
}
// TIFF file
case ".TIF":
case ".TIFF":
_imageFileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);
TiffBitmapDecoder tiffDecoder = new TiffBitmapDecoder(_imageFileStream, BitmapCreateOptions.None, BitmapCacheOption.Default);
if (pageIndex == -1 && tiffDecoder.Frames.Count > 1)
{
pageIndex = SelectImageFrameWindow.SelectFrameIndex(tiffDecoder.Frames.Count);
return(tiffDecoder.Frames[pageIndex]);
}
return(tiffDecoder.Frames[0]);
// image
default:
_imageFileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);
BitmapImage image = new BitmapImage();
image.BeginInit();
image.StreamSource = _imageFileStream;
image.CacheOption = BitmapCacheOption.OnLoad;
image.EndInit();
return(image);
}
}
