Powerpoint Interop does not work in a Windows service, but works fine in a Windows Form application

Question

I wrote an application to view a folder, and whenever a PowerPoint document falls into it, it looks at the slides inside it and generates png images of each slide. This works fine in a Windows Forms application, but I put the exact same code into a Windows service, used the same test file, and could not open it with the following error:

Error: PowerPoint could not open the file. at Microsoft.Office.Interop.PowerPoint.Presentations.Open (String FileName, MsoTriState ReadOnly, MsoTriState Untitled, MsoTriState WithWindow) -2147467259 Error Com

I found that the service starts with my own user account (with administrator privileges), so I think this would eliminate permission problems, but I can not think of anything else to try.

Any suggestions?

Answer 1

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Answer 2

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Office Windows 2008

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Answer 3

• > p > p > DCOM.
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Answer 4

Try installing the Service to interact with the desktop.