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C# - NullReferenceException in PdfSharp.dll http://forum.pdfsharp.com/viewtopic.php?f=2&t=3903 |
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Author: | lerxx [ Sat Jan 19, 2019 5:48 pm ] |
Post subject: | C# - NullReferenceException in PdfSharp.dll |
Hello community, I have a problem with the PdfSharp.dll and exceptions. I want to merge a few pdfs to one pdf but everytime when I'm using code like this: Code: foreach (string file in files) { // Open the document to import pages from it. PdfDocument inputDocument = PdfReader.Open(file, PdfDocumentOpenMode.Import); // Iterate pages int count = inputDocument.PageCount; for (int idx = 0; idx < count; idx++) { // Get the page from the external document... PdfPage page = inputDocument.Pages[idx]; // ...and add it to the output document. outputDocument.AddPage(page); } } I am getting an NullReferenceException thrown by calling the function "outputDocument.AddPage(page)" -> "public PdfPage addPage(PdfPage page)" -> "internal PdfCatalog Catalog". Code: /// <summary> /// Gets the PdfCatalog of the current document. /// </summary> internal PdfCatalog Catalog { get { return _catalog ?? (_catalog = _trailer.Root); } } Ausnahme ausgelöst: 'System.NullReferenceException' in PdfSharp.dll ("Object reference not set to an instance of an object.") System.NullReferenceException Can anyone tell me what I could do? Thanks in advance! |
Author: | TH-Soft [ Sat Jan 19, 2019 5:55 pm ] |
Post subject: | Re: C# - NullReferenceException in PdfSharp.dll |
Hi! Maybe there's a problem with your PDF, not with your code. See also: http://forum.pdfsharp.net/viewtopic.php?f=2&t=832 |
Author: | lerxx [ Sat Jan 19, 2019 7:57 pm ] |
Post subject: | Re: C# - NullReferenceException in PdfSharp.dll |
Thanks for your fast reply! Now it seems to work but I have the problem, that the documents are empty (I can't open the "merged" pdf). Do you have an idea why? Thanks in advance. Code: PdfSharp.Pdf.PdfDocument outputDocument = new PdfSharp.Pdf.PdfDocument(); int numberOfDocs = 0; //IniFile beinhaltet Namen der Dokumente die beruecksichtigt werden sollen //string[] specifiedDocuments = documentsSpecifiedInIniFile(); foreach (string file in files) { //"-Alle_Dokumente.pdf" if (!file.Contains("-Alle_Dokumente.pdf")) { numberOfDocs++; // // Open the document to import pages from it. PdfDocument inputDocument = PdfReader.Open(file, PdfDocumentOpenMode.Import); // // Iterate pages int count = inputDocument.PageCount; for (int idx = 0; idx < count; idx++) { try { PdfPage page = inputDocument.Pages[idx]; outputDocument.AddPage(page); } catch (NullReferenceException ex) { string[] text1 = { "text" }; System.IO.File.WriteAllLines(@"C:\errorAddPage.txt", text1); } } } } // Save new file if it has pages and its more than one document int pagesoutput = 0; try { pagesoutput = outputDocument.PageCount; } catch (NullReferenceException ex) { //Error } if ( numberOfDocs > 1) { try { outputDocument.Save(fileNameComplete); } catch { using (EventLog eventLog = new EventLog("PDF_Converter")) { eventLog.Source = "PDF_Converter"; eventLog.WriteEntry("Error creating file!\n " + fileNameComplete, EventLogEntryType.Information, 101, 1); } } } } I have tested the DLL-file and some new simple code and found out, that it has nothing to do with the pdf files. This simple project: using PdfSharp.Drawing; namespace PdfSharp { class Program { static void Main(string[] args) { // Create a new PDF document PdfSharp.Pdf.PdfDocument document = new PdfSharp.Pdf.PdfDocument(); // Create an empty page PdfSharp.Pdf.PdfPage page = document.AddPage(); // Save the document... string filename = "HelloWorld.pdf"; document.Save(filename); // ...and start a viewer. //Process.Start(filename); } } } throws exactly the same exception by calling the function "AddPage". Do you have any idea what I am doing wrong? |
Author: | TH-Soft [ Sun Jan 20, 2019 10:30 am ] |
Post subject: | Re: C# - NullReferenceException in PdfSharp.dll |
Cannot reproduce. Quote: Showing source code snippets in the forum or attaching PDF files without code will often be insufficient to replicate the problem. viewtopic.php?f=2&t=832 |
Author: | lerxx [ Sun Jan 20, 2019 10:45 am ] |
Post subject: | Re: C# - NullReferenceException in PdfSharp.dll |
TH-Soft wrote: Cannot reproduce. Quote: Showing source code snippets in the forum or attaching PDF files without code will often be insufficient to replicate the problem. viewtopic.php?f=2&t=832 Hi, I have solved the problem by creating a new Pdfsharp.dll. Now it works, thanks for your help! |
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