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POError when trying to open PowerPoint programatically
 

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    <p>I have a method that uses Microsoft.Office.Interop.PowerPoint.Application interface to convert PowerPoint presentation slides into a jpeg files. In a serivce application that runs on Windows 2008 server it works without any issues.</p> <p>Now however, I'm writing a new web application that uses the same process and the degubber chokes on the Presentation.Open call wiht an error: "PowerPoint could not open file".</p> <p>My environment is Win 7, VS 2010. I'm using impersonation with a domain account that has admin privileges. The PowePoint file I'm trying to open is in the c:\temp folder which has NTFS rights of "everyone" set to full; file is NOT read-only, I can manually opent the file using a similar account as the domain account I'm using for impersonation. I don't know what the problem is. Can someone sugest what's going on? Thanks, Risho.</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.IO; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using AjaxControlToolkit; using Microsoft.Office.Core; using Microsoft.Office.Interop.PowerPoint; using System.Threading; public partial class _Default : System.Web.UI.Page { private static int folderExtension; private static string tempSavePath, fileName; protected void Page_Load(object sender, EventArgs e) { } private void Page_Error(object sender, EventArgs e) { Random r = new Random(); int eventID = r.Next(1, 65535); Exception objErr = Server.GetLastError().GetBaseException(); string err = "\nPage_Error Event" + "\n\nError in: " + Request.Url.ToString() + "\n\nError Message:" + objErr.Message.ToString() + "\n\nStack Trace:" + objErr.StackTrace.ToString() + "\n"; uploadResult.Text = err.ToString(); } protected void AsyncFileUpload1_click(object sender, AsyncFileUploadEventArgs e) { // Temporary folder where the presentation file is uploaded. tempSavePath = @"c:\temp\"; // Checks if there is a file present for uploading. if (AsyncFileUpload1.HasFile) { fileName = AsyncFileUpload1.FileName; try { AsyncFileUpload1.SaveAs(tempSavePath + fileName); } catch (Exception ex) { throw ex; } finally { ConvertToJpegs(); } } else { uploadResult.Text = "No file to upload."; } } // Converts the presentation slides into individual jpeg files. protected void ConvertToJpegs() { Microsoft.Office.Interop.PowerPoint.Application app = new Microsoft.Office.Interop.PowerPoint.Application(); Microsoft.Office.Core.MsoTriState ofalse = Microsoft.Office.Core.MsoTriState.msoFalse; Microsoft.Office.Core.MsoTriState otrue = Microsoft.Office.Core.MsoTriState.msoTrue; Presentation pptPresentation = null; try { **&gt;&gt;&gt; It break here with the ".Open" call &lt;&lt;&lt;** pptPresentation = app.Presentations.Open(tempSavePath + fileName, ofalse, ofalse, ofalse); pptPresentation.SaveAs(tempSavePath + ".", PpSaveAsFileType.ppSaveAsJPG, ofalse); Thread.Sleep(500); } catch (Exception ex1) { throw ex1; } finally { pptPresentation.Close(); } } } </code></pre>
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