Unable to load DLL 'pdfium' or one of its dependencies: The specified procedure could not be found. (0x8007007F)

[KlausBenislavskis]

Question

Is there a way to run this library on .net 8 windows nano server? I am getting this error

   at PDFtoImage.Internals.NativeMethods.FPDF_InitLibrary()
   at PDFtoImage.Internals.PdfLibrary.EnsureLoaded()
   at PDFtoImage.Internals.PdfFile..ctor(Stream stream, String password, Boolean disposeStream)
   at PDFtoImage.Internals.PdfDocument.Load(Stream stream, String password, Boolean disposeStream)
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
   at PDFtoImage.Conversion.ToImagesAsync(Stream pdfStream, Boolean leaveOpen, String password, RenderOptions options, CancellationToken cancellationToken)+MoveNext()
   at PDFtoZPL.Conversion.ConvertPdfAsync(Stream pdfStream, Boolean leaveOpen, String password, PdfOptions pdfOptions, ZplOptions zplOptions, CancellationToken cancellationToken)+MoveNext()
   at PDFtoZPL.Conversion.ConvertPdfAsync(Stream pdfStream, Boolean leaveOpen, String password, PdfOptions pdfOptions, ZplOptions zplOptions, CancellationToken cancellationToken)+MoveNext()
   at PDFtoZPL.Conversion.ConvertPdfAsync(Byte[] pdfAsByteArray, String password, PdfOptions pdfOptions, ZplOptions zplOptions, CancellationToken cancellationToken)+MoveNext()
   at PDFtoZPL.Conversion.ConvertPdfAsync(Byte[] pdfAsByteArray, String password, PdfOptions pdfOptions, ZplOptions zplOptions, CancellationToken cancellationToken)+MoveNext()
   at PDFtoZPL.Conversion.ConvertPdfAsync(String pdfAsBase64String, String password, PdfOptions pdfOptions, ZplOptions zplOptions, CancellationToken cancellationToken)+MoveNext()
   at PDFtoZPL.Conversion.ConvertPdfAsync(String pdfAsBase64String, String password, PdfOptions pdfOptions, ZplOptions zplOptions, CancellationToken cancellationToken)+MoveNext()

[sungaila]

Hi @KlausBenislavskis,

thanks for opening this issue! It should work because the GitHub workflow runs on windows-2019 and windows-2022 which are Windows Nano Server, I think. Or are they Windows Server Core?

I'll test this locally and I will get back to you.

[sungaila]

So I've been testing this and can confirm that this library is running on Windows Server Core, but NOT on Windows Nano Server.

I'm looking into a way to get this working ...

[sungaila]

The pdfium binaries are not linked against onecore and as such cannot be used in Nano Server directly. See chapter Reverse Forwarders.

pdfium.dll depends on the following dlls to work:

• KERNEL32.dll
• ADVAPI32.dll
• GDI32.dll
• USER32.dll

If you still wish to use this library, you will have to install the Reverse Forwarders in your Nano Server first.

[sungaila]

Please let me know if installing those reverse forwarders helped and reopen this issue.