Initial Commit

PDF Duplexer.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30011.22
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PDF Duplexer", "PDF Duplexer\PDF Duplexer.csproj", "{D565CC0B-48A0-4D43-B0E3-CA87E83A6267}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{D565CC0B-48A0-4D43-B0E3-CA87E83A6267}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D565CC0B-48A0-4D43-B0E3-CA87E83A6267}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D565CC0B-48A0-4D43-B0E3-CA87E83A6267}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D565CC0B-48A0-4D43-B0E3-CA87E83A6267}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8DE1403B-7C89-41D4-9567-9BDB30EDB9E3}
+	EndGlobalSection
+EndGlobal

PDF Duplexer/App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="BouncyCastle.Crypto" publicKeyToken="0e99375e54769942" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-1.8.6.0" newVersion="1.8.6.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+</configuration>

PDF Duplexer/Main Form.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Diagnostics;
+using System.Drawing;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using iText.Kernel.Pdf;
+
+namespace PDF_Duplexer {
+    public partial class FrmMain : Form {
+        public FrmMain() {
+            InitializeComponent();
+        }
+
+        public void SendToPrinter(string filePath, int pageCount) {
+            Cursor.Current = Cursors.WaitCursor;
+            ProcessStartInfo info = new ProcessStartInfo() {
+                Verb = "print",
+                FileName = filePath,
+                CreateNoWindow = true,
+                WindowStyle = ProcessWindowStyle.Hidden
+            };
+            Process p = new Process() {
+                StartInfo = info
+            };
+            p.Start();
+            p.WaitForInputIdle();
+
+            // Wait minimum 3 seconds plus however many pages are being printed:
+            if (pageCount < 3) {
+                pageCount = 3;
+            }
+            System.Threading.Thread.Sleep(1000 * pageCount);
+
+            if (false == p.CloseMainWindow())
+                p.Kill();
+            Cursor.Current = Cursors.Default;
+        }
+
+        private void CleanUp(string path1, string path2) {
+            File.Delete(path1);
+            File.Delete(path2);
+        }
+        private void Print() {
+            // Protects accidentally deleting an existing file in Downloads:
+            Random random = new Random();
+            int randomNumber = random.Next(0, 10000);
+
+            string destinationOdd = @"C:\Users\" + Environment.UserName + @"\Downloads\odd temp" + randomNumber.ToString() + ".pdf";
+            string destinationEven = @"C:\Users\" + Environment.UserName + @"\Downloads\even temp" + randomNumber.ToString() + ".pdf";
+
+            var dir = new DirectoryInfo(@"C:\Users\" + Environment.UserName + @"\Downloads");
+            var pdfFile = (from f in dir.GetFiles()
+                           orderby f.LastWriteTime
+                           select f).Last();
+            if (pdfFile.Extension.ToLower() != ".pdf") {
+                MessageBox.Show("Please download a PDF first to print it double sided!");
+                return;
+            }
+            DialogResult dialog1 = MessageBox.Show("Would you like to print " + pdfFile.Name + " double sided?", "Print " + pdfFile.Name + " double sided?", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
+            if (dialog1 == DialogResult.Yes) {
+                PdfDocument doc = new PdfDocument(new PdfReader(pdfFile.FullName));
+
+                int numberOfPages = doc.GetNumberOfPages();
+
+                List<int> odds = new List<int>();
+                List<int> evens = new List<int>();
+                for (var i = 1; i <= numberOfPages; i++) {
+                    if (i % 2 != 0)
+                        odds.Add(i);
+                }
+                for (int i = 1; i <= numberOfPages; i++) {
+                    if (i % 2 == 0)
+                        evens.Add(i);
+                }
+                evens.Reverse();
+
+                PdfDocument oddPDFWriter = new PdfDocument(new PdfWriter(destinationOdd));
+                PdfDocument evenPDFWriter = new PdfDocument(new PdfWriter(destinationEven));
+
+                 //If odd number of pages, append blank page to beginning of even pages:
+                if (numberOfPages % 2 != 0) {
+                    evenPDFWriter.AddNewPage();
+                }
+
+                foreach (var oddPage in odds)
+                    doc.CopyPagesTo(oddPage, oddPage, oddPDFWriter);
+                foreach (var evenPage in evens)
+                    doc.CopyPagesTo(evenPage, evenPage, evenPDFWriter);
+
+                int oddPageCount = oddPDFWriter.GetNumberOfPages();
+                int evenPageCount = evenPDFWriter.GetNumberOfPages();
+
+                oddPDFWriter.Close();
+                evenPDFWriter.Close();
+
+                // Print odd side:
+                SendToPrinter(destinationOdd, oddPageCount);
+
+                DialogResult dialog2 = MessageBox.Show("Please put the papers back into the printer face down. Then press OK to continue.", "Put back into printer", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
+                if (dialog2 != DialogResult.OK) {
+                    CleanUp(destinationOdd, destinationEven);
+                    return;
+                }
+
+                // Print even side:
+                SendToPrinter(destinationEven, evenPageCount);
+
+                // Clean up:
+                CleanUp(destinationOdd, destinationEven);
+                return;
+            } else
+                return;
+        }
+        private void FrmMain_Load(object sender, EventArgs e) {
+
+        }
+
+        private void BtnPrint_Click(object sender, EventArgs e) {
+            Print();
+        }
+
+        private void BtnExit_Click(object sender, EventArgs e) {
+            Application.Exit();
+        }
+    }
+}