How do I convert Word files to PDF programmatically?

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Use a foreach loop instead of a for loop - it solved my problem.

int j = 0; foreach (Microsoft.Office.Interop.Word.Page p in pane.Pages) { var bits = p.EnhMetaFileBits; var target = path1 +j.ToString()+ "_image.doc"; try { using (var ms = new MemoryStream((byte[])(bits))) { var image = System.Drawing.Image.FromStream(ms); var pngTarget = Path.ChangeExtension(target, "png"); image.Save(pngTarget, System.Drawing.Imaging.ImageFormat.Png); } } catch (System.Exception ex) { MessageBox.Show(ex.Message); } j++; }

Here is a modification of a program that worked for me. It uses Word 2007 with the Save As PDF add-in installed. It searches a directory for .doc files, opens them in Word and then saves them as a PDF. Note that you'll need to add a reference to Microsoft.Office.Interop.Word to the solution.

using Microsoft.Office.Interop.Word; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; ... // Create a new Microsoft Word application object Microsoft.Office.Interop.Word.Application word = new Microsoft.Office.Interop.Word.Application(); // C# doesn't have optional arguments so we'll need a dummy value object oMissing = System.Reflection.Missing.Value; // Get list of Word files in specified directory DirectoryInfo dirInfo = new DirectoryInfo(@"\\server\folder"); FileInfo[] wordFiles = dirInfo.GetFiles("*.doc"); word.Visible = false; word.ScreenUpdating = false; foreach (FileInfo wordFile in wordFiles) { // Cast as Object for word Open method Object filename = (Object)wordFile.FullName; // Use the dummy value as a placeholder for optional arguments Document doc = word.Documents.Open(ref filename, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing); doc.Activate(); object outputFileName = wordFile.FullName.Replace(".doc", ".pdf"); object fileFormat = WdSaveFormat.wdFormatPDF; // Save document into PDF Format doc.SaveAs(ref outputFileName, ref fileFormat, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing); // Close the Word document, but leave the Word application open. // doc has to be cast to type _Document so that it will find the // correct Close method. object saveChanges = WdSaveOptions.wdDoNotSaveChanges; ((_Document)doc).Close(ref saveChanges, ref oMissing, ref oMissing); doc = null; } // word has to be cast to type _Application so that it will find // the correct Quit method. ((_Application)word).Quit(ref oMissing, ref oMissing, ref oMissing); word = null;

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