We're sorry GroupDocs doesn't work properply without JavaScript enabled.

Free Support Forum - groupdocs.com

GroupDocsMergerException: Failed to detect file type when using a stream as input

GroupDocs.Merger Product Family
#1

Hi, I’m using GroupDocs.Merger and I’m getting this error:
GroupDocsMergerException: Failed to detect file type.

My C# code looks like this…

var tocStream = new MemoryStream();
// tocStream contains an ASCII encoded byte array of HTML
using (Merger merger = new Merger(tocStream)) // error on this line...
{
merger.Join(filePath)
...add more documents to the Merger object
}

This used to work in an older version of GroupDocs.Merger that I used on .NET5.
I have recently upgraded our codebase to .NET6 and updated our GroupDocs.Merger to Version 22.1 and now we get this error.

Can you give me any advice on what I need to do to make this work properly again?

Thank you.

#2

@alfredbr

We are investigating this issue with ticket ID MERGERNET-1204. You’ll be notified in case of any update.

#3

Hi!

Any update on this? I’ve tried a few approaches but nothing works.

-AlfredBr

#4

@alfredbr

This issue is still under investigation. We’ll inform you in case of any update.

#5

I’m using VS2022 and .NET6.0.3

I’ve done some more experimentation and I now when I call:

merger.Save(filename);

I get this error:

Could not load file or assembly ‘Aspose.PDF, Version=20.6.0.0, Culture=neutral, PublicKeyToken=f0262d67fe233d63’. General Exception (0x80131500)

This is my PackageReference from my .csproj:

<PackageReference Include="GroupDocs.Merger" Version="22.1" />
<PackageReference Include="GroupDocs.Conversion" Version="22.2.0" />
#6

Based on the text of the error:

Could not load file or assembly ‘Aspose.PDF, Version=20.6.0.0, Culture=neutral, PublicKeyToken=f0262d67fe233d63’. General Exception (0x80131500)

I decided to try to download Aspose.PDF from Nuget. Now my code runs without error, but it only renders three pages in the PDF output (when I expected dozens of pages.)

#7

@alfredbr

We are also investigating this issue with ticket ID MERGERNET-1205.

Do you get evaluation watermark in the output document? Did you apply Aspose.PDF license as well?

#8

No, I do not get the evaluation watermark in the output document.

I don’t have a license for Aspose.PDF. I purchased GroupDocs.Merger and it appears to be asking for Aspose.PDF. I only downloaded Aspose.PDF because GroupDocs.Merger seems to be asking about it (and I am desparate to get this working.)

#9

I could not get the Merger() constructor to work with a stream, so I switched to a file.

using (Merger merger = new Merger(filename) {
...merge additional files in a loop...
merger.Save(mergedFileName);
}

But I’ve noticed that the handle to the file that I pass to the constructor is not closed after exiting the using() context. This causes an error the next time I try to merge that file into another PDF.

#10

@alfredbr

This scenario is under investigation.

Could you please share the sample application with the source/problematic file(s)?

#11

I don’t think your library works under .net6.
I’ve reverted back to .net5 and it works as before.

#12

We are investigating the possibility to add .NET 6 support. Your investigation ticket ID is MERGERNET-1207. Meanwhile, you can continue with .NET 5.

#13

Please try to get .net6 support working soon. .net5 support runs out soon (i.e. May 8, 2022)

#14

Yes, we will investigate this scenario. You’ll be notified in case of any update.

#15

A post was split to a new topic: Failed to detect file type when using a stream as input