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POC#: Powerpoint does not Quit?
 

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    <p>I have a script that opens Powerpoint from my application and exports all slides. After that, I need the application to be closed.</p> <p>I've tried without any luck. Could you please help?</p> <pre><code>using System; using System.Collections.Generic; using System.Text; using System.IO; using Powerpoint = Microsoft.Office.Interop.PowerPoint; using Microsoft.Office.Core; using Microsoft.Office.Interop.PowerPoint; using System.Runtime.InteropServices; namespace PresentrBuilder { class PowerpointConverter { public static void Convert(String file, String safeFile) { Powerpoint.Application PP; Powerpoint.Presentation Presentation; PP = new Powerpoint.ApplicationClass(); PP.Visible = MsoTriState.msoTrue; PP.WindowState = Microsoft.Office.Interop.PowerPoint.PpWindowState.ppWindowMinimized; Presentation = PP.Presentations.Open(file, MsoTriState.msoFalse, MsoTriState.msoTrue, MsoTriState.msoTrue); // Voor elke slide, exporteren String exportSlidesPath = Path.Combine(Properties.Settings.Default.CacheDir, @"presentatienaam1\slides"); // Kijk of de directory bestaat if (!Directory.Exists(exportSlidesPath)) { Directory.CreateDirectory(exportSlidesPath); } // Kijk of er al bestanden in de directory staan // Zo ja: verwijderen String[] files = Directory.GetFiles(exportSlidesPath, "*.png"); if (files.Length &gt; 0) { foreach (string fileName in files) { File.Delete(Path.Combine(exportSlidesPath, fileName)); } } // Elke slide exporteren foreach (Slide slide in Presentation.Slides) { slide.Export(Path.Combine(exportSlidesPath, "slide_" + slide.SlideIndex + ".png"), "PNG", 1024, 768); Marshal.ReleaseComObject(slide); } GC.Collect(); GC.WaitForPendingFinalizers(); Marshal.ReleaseComObject(PP.Presentations); Marshal.ReleaseComObject(Presentation.Slides); Presentation.Close(); Marshal.FinalReleaseComObject(Presentation); PP.Quit(); Marshal.FinalReleaseComObject(PP); } } } </code></pre>
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    1. COYou've edited your code above, but it's still not right. You call PP.Presentations (and Presentation.Slides) twice, once to use them and then once to release the reference. However it doesn't work like that - each time you invoke them, you create another reference. You need to invoke them once, and store the reference in a variable that you can then release (as per Andre's answer).
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      1. USGary McGill
    2. COpossible duplicate of [PowerPoint Launched via C# does not Quit](http://stackoverflow.com/questions/981547/powerpoint-launched-via-c-sharp-does-not-quit)
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