When using an ImageSharp version bigger than 2.0 an exception is thrown: "MissingMethodException: 'Method not found: 'SixLabors.ImageSharp.Image SixLabors.ImageSharp.Image.Load(Byte[], SixLabors.ImageSharp.Formats.IImageFormat ByRef)'."
Workaround: Downgrade to a lower ImageSharp version or use a custom implementation of ImagePropertiesResolverBase/JpegImageConverter.
When the indirect object contains more spaces between the object number and the generation number the object content is not successfully parsed.
Expected: one space
Actual: more than one space
Hi there,
I've been researching how to use Telerik PDFProcessing to Digitally Sign a PDF. But can't find any documentation on how to incorporate it into ASP.Net AJAX (VB).
Can you please point me in the direction of where to look, or if you have a sample application that would be very helpful.
Essentially, I'm just trying to digitally sign the PDF document that I've exported with the embedded signature panel with a PKF file.
IOException when an object in the cross-reference stream has a negative offset.
"System.IO.IOException: An attempt was made to move the file pointer before the beginning of the file."
When a document contains Type1 font without Private Dict in some cases the glyphs are not rendered as expected.
I'm trying to use the PdfFormatProvider to import a pdf. I've tried to import multiple different pdfs with the code below, but they all throw an exception with "System.InvalidOperationException: 'Import not supported.'" and no other info. Is this a bug or am I not calling the correct method to import a pdf?
var providerPDF = new Telerik.Windows.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider(); providerPDF.Import(File.ReadAllBytes(@"D:\TestDocs\TestImage.pdf"));
Hello, I had many problems with version 2023.1.117, latest stable 2023.2.606 is unusable also due to issue with scanned documents etc, so I tried 2020.2.703-hotfix, but I am getting other set of issues.
Unfortunately I cannot share the documents, since they are confidential.
With some documents I am getting this error:
Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfName' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Objects.FormXObject'.
Loading Code:
PdfFormatProvider pdfFormatProvider = new();
RadFixedDocument document = pdfFormatProvider.Import(bytes);
And stack trace:
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.AppearanceConverter.ConvertFromDictionary(PostScriptReader reader, IPdfImportContext context, PdfDictionary dictionary)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.AppearanceConverter.Convert(Type type, PostScriptReader reader, IPdfImportContext context, IPdfPrimitive value)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.AppearanceConverter.ConvertFromIndirectReference(Type type, PostScriptReader reader, IPdfImportContext context, IndirectReference indirectReference)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.AppearanceConverter.Convert(Type type, PostScriptReader reader, IPdfImportContext context, IPdfPrimitive value)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.AppearancesConverter.TryImportAppearance(String key, PostScriptReader reader, IPdfImportContext context, PdfDictionary appearancesDictionary, Appearance& appearance)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.AppearancesConverter.ConvertFromDictionary(Type type, PostScriptReader reader, IPdfImportContext context, PdfDictionary dictionary)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Converters.Converter.Convert(Type type, PostScriptReader reader, IPdfImportContext context, IPdfPrimitive value)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Data.PdfPropertyBase`1.PrepareValue(PostScriptReader reader, IPdfImportContext context, IPdfPrimitive value)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Data.LoadOnDemandPropertyBase`1.GetValueFromSource(Boolean shouldDecrypt)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Data.LoadOnDemandPropertyBase`1.GetValue(Boolean shouldDecrypt)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Annotations.AnnotationObject.get_Appearances()
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.Annotations.AnnotationObject.ToAnnotation(PostScriptReader reader, IRadFixedDocumentImportContext context, Double pageHeightInDip)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.DocumentStructure.Page.<>c__DisplayClass21_0.<CopyPageAnnotationsTo>b__0()
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.ExceptionHandling.ExecutionHandler.TryHandleExecution[E](Action operation)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.DocumentStructure.Page.CopyPageAnnotationsTo(IRadFixedDocumentImportContext context, RadFixedPage fixedPage)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.DocumentStructure.DocumentCatalog.<>c__DisplayClass59_2.<CopyAllPageProperties>b__2()
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.ExceptionHandling.ExecutionHandler.TryHandleExecution[E](Action operation)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.DocumentStructure.DocumentCatalog.CopyAllPageProperties(PostScriptReader reader, IRadFixedDocumentImportContext context, List`1 contextPages, IList`1 pages)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.DocumentStructure.DocumentCatalog.CopyPagePropertiesTo(PostScriptReader reader, IRadFixedDocumentImportContext context)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Elements.DocumentStructure.DocumentCatalog.CopyPropertiesTo(PostScriptReader reader, IRadFixedDocumentImportContext context)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Import.RadFixedDocumentImportContext.BeginImportOverride()
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Import.BaseImportContext.BeginImport(Stream pdfFileStream)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Import.PdfImporter.Import(Stream input, IPdfImportContext context)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider.<>c__DisplayClass18_0.<ImportOverride>b__0()
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.ExceptionHandling.ExecutionHandler.TryHandleExecution[E](Action operation)
at Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider.ImportOverride(Stream input)
at Telerik.Windows.Documents.Common.FormatProviders.FormatProviderBase`1.Import(Stream input)
at Telerik.Windows.Documents.Common.FormatProviders.BinaryFormatProviderBase`1.Import(Byte[] input)
at Client.Wpf.Common.UserControls.PdfViewer.LoadBytesToPdfViewer(Byte[] bytes) in C:\Users\tomas.filip\source\repos\FiFi\Client.Wpf\Common\UserControls\PdfViewer.xaml.cs:line 65
at System.Reactive.AnonymousSafeObserver`1.OnNext(T value)
at System.Reactive.ObserveOnObserverNew`1.DrainStep(ConcurrentQueue`1 q)
at System.Reactive.ObserveOnObserverNew`1.DrainShortRunning(IScheduler recursiveScheduler)
at System.Reactive.Concurrency.DispatcherScheduler.<>c__DisplayClass12_0`1.<Schedule>b__0()
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
When importing specific documents and signing a predefined SignatureField leads to not successfully validated signatures in Adobe, but successfully validated in other pdf viewers (eg. Telerik WPF PdfViewer, Foxit PDF Reader).
Solution:
When signing an existing document (after the import) we must be sure the AcroForm's ViewersShouldRecalculateWidgetAppearances property is set to false, otherwise, the exported and signed PDF document could not be shown as a signed.
if (document.AcroForm.ViewersShouldRecalculateWidgetAppearances)
{
document.AcroForm.ViewersShouldRecalculateWidgetAppearances = false;
}
When exporting documents containing TrueType Postscript fonts perceived as Standard fonts the fonts should not be embedded but they actually are.
Examples of such fonts are Arial MT, TimesNewRomanPSMT, etc.
