PPTX to Image conversion doesn't work on windows server 2012 production

问题

We have requirement to convert uploaded PPT or PPTX files into image files. We developed this working locally with following (POC code):

Application pptApplication = new Application();
Microsoft.Office.Interop.PowerPoint.Presentation pptPresentation = pptApplication.Presentations.Open2007(filePath, MsoTriState.msoFalse, MsoTriState.msoFalse, MsoTriState.msoFalse);
List<string> files = new List<string>();
for (int i = 1; i <= pptPresentation.Slides.Count; i++)
{
    pptPresentation.SaveCopyAs(serverPath + randomId, PpSaveAsFileType.ppSaveAsPNG, MsoTriState.msoTrue);
    files.Add(root + "Uploads/Slide" + i + ".PNG");
}
pptPresentation.Close();

Now when this code is deployed on Windows Server 2012 R2, I receive following error:

This error looks like some access permissions issue and when I googled I found several solutions which I tried with no luck, here's some of them:

1. Install office on server - not make any sense to have office on server :( well I installed and still getting same issue.

2. Install office Interop Assemblies on server - i can't find this assembly for windows server 2012, the one i found here https://www.microsoft.com/en-us/download/details.aspx?id=3508 is not supported for 2012 and when I installed it doesn't work.

3. Tried this solution https://stackoverflow.com/a/30117146 as well

4. We can't switch to paid solutions like Aspose, Spire etc

Any help on this thread is highly appreciated. Thanks.

回答1:

Here's the narrowed down solution which worked on all the servers, i'm posting this solution after 7 months mature research.

1. Installed Office and activated the product on every servers
2. Created a folder 'Desktop' at C:\Windows\SysWOW64\config\systemprofile\Desktop (64 bit OS)
3. In IIS changed ApplicationPool identity from 'ApplicationPoolIdentity' to 'LocalSystem'.

That's it and i was able to convert slides into images.

Source Code

In case you are interested in code that I was using:

Application pptApplication = new Application();
Microsoft.Office.Interop.PowerPoint.Presentation pptPresentation = pptApplication.Presentations.Open2007(Server.MapPath("~/tempslides/pptfilename.pptx"), MsoTriState.msoFalse, MsoTriState.msoFalse, MsoTriState.msoFalse);
List<string> files = new List<string>();
for (int i = 1; i <= pptPresentation.Slides.Count; i++)
{
    pptPresentation.SaveCopyAs(serverPath + randomId, PpSaveAsFileType.ppSaveAsPNG, MsoTriState.msoTrue);
    files.Add(Server.MapPath("~/tempslides") + "/slide" + i + ".PNG");
}
pptPresentation.Close();

To run above code, you need to add reference to interop lib in your project.

Hope this helps you to save your time.

来源：https://stackoverflow.com/questions/36059617/pptx-to-image-conversion-doesnt-work-on-windows-server-2012-production