Implemented VirtualPrinterDriver project

Agent/VirtualPrinter.Delivery/GhostScriptRedirector.cs

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+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Printing;
+using JetBrains.Annotations;
+using VirtualPrinter.Logging;
+using VirtualPrinter.Utils;
+
+namespace VirtualPrinter.Delivery
+{
+    /// <summary>
+    /// Redirects instructions to Ghostscript
+    /// </summary>
+    public class GhostScriptRedirector
+    {
+        private const string GsWin64 = "gswin64c.exe";
+        private const string GsWin32 = "gswin32c.exe";
+
+        [NotNull]
+        private readonly PrintQueue _queue;
+
+        public GhostScriptRedirector([NotNull]PrintQueue queue)
+        {
+            if (queue == null)
+            {
+                throw new ArgumentNullException(nameof(queue));
+            }
+
+            _queue = queue;
+        }
+
+        /// <summary>
+        /// Starts the Ghostscript process for the specified <paramref name="file"/>
+        /// </summary>
+        /// <param name="file">The .redirect file located in the PrinterOutput directory</param>
+        public void Redirect([NotNull]string file)
+        {
+            if (file == null)
+            {
+                throw new ArgumentNullException(nameof(file));
+            }
+
+            var logger = new VirtualPrinterLogger<GhostScriptRedirector>();
+            var ghostScriptExe = GetGhostScriptPath();
+
+            if (ghostScriptExe == null)
+            {
+                throw new FileNotFoundException("Can not find Ghostscript.");
+            }
+
+            // More details about the arguments can be find at https://www.ghostscript.com/doc/current/Use.htm
+            var ghostScriptArguments = $"-dPrinted -dBATCH -dNOPAUSE -dNoCancel -dNOSAFER -q -dNumCopies=1 -sDEVICE=mswinpr2 -sOutputFile=\"%printer%{ _queue.FullName}\" \"{file}\"";
+            logger.Info("Try to start the process {ghostScriptExe} with the following arguments: {ghostScriptArguments}.", ghostScriptExe, ghostScriptArguments);
+
+            var processStartInfo = new ProcessStartInfo
+            {
+                FileName = ghostScriptExe,
+                Arguments = ghostScriptArguments,
+                UseShellExecute = false,
+                RedirectStandardOutput = true,
+                CreateNoWindow = false,
+                WindowStyle = ProcessWindowStyle.Hidden
+            };
+
+            try
+            {
+                using(var process = Process.Start(processStartInfo))
+                {
+                    process.WaitForExit();
+                }
+            }
+            catch (Exception exception)
+            {
+                logger.Error(exception, "Failed to start {ghostScriptExe} with the following arguments: {ghostScriptArguments}", ghostScriptExe, ghostScriptArguments);
+            }
+        }
+
+        [CanBeNull]
+        private string GetGhostScriptPath()
+        {
+            return GetGhostScriptPath(GsWin64) ?? GetGhostScriptPath(GsWin32);
+        }
+
+        [CanBeNull]
+        private string GetGhostScriptPath(string execName)
+        {
+            if (!new RegistryRepository().TryGetGhostscriptPath(out var path))
+            {
+                return null;
+            }
+
+            var ghostScriptBinPath = Path.Combine(path, "bin");
+            var fullPath = Path.Combine(ghostScriptBinPath, execName);
+
+            return File.Exists(fullPath) ? fullPath : null;
+        }
+    }
+}