Converting AutoCAD Drawings to PDF

////////////////////////////////////////////////////////////////////////////////////////////////////
// This example was designed for using in Microsoft Visual C# from 
// Microsoft Visual Studio 2003 or above.
//
// 1. Autodesk AutoCAD 2000 or above should be installed and activated on your PC.
//    Autodesk AutoCAD LT does not have COM interface and cannot be used as COM-server!
//
// 2. Universal Document Converter 5.2 or above should be installed, too.
//
// 3. Add references to "AutoCAD 2006 Type Library", "AutoCAD/ObjectDBX Common 16.0 Type Library" and 
//    "Universal Document Converter Type Library" using the Project | Add Reference menu > COM tab.
//    The version numbers in the type library names may be different depending on AutoCAD's version 
//    installed on your computer.
////////////////////////////////////////////////////////////////////////////////////////////////////
 
using System;
using System.IO;
using System.Globalization;
using UDC;
using AutoCAD = Autodesk.AutoCAD.Interop;
 
namespace AutoCADtoPDF
{
    class Program
    {
        static void PrintAutoCADtoPDF(string AutoCADFilePath)
        {
            //Create a UDC object and get its interfaces
            IUDC objUDC = new APIWrapper();
            IUDCPrinter Printer = objUDC.get_Printers("Universal Document Converter");
            IProfile Profile = Printer.Profile;
 
            //Use Universal Document Converter API to change settings of converterd drawing
            Profile.Load(@"C:\Program Files\Universal Document Converter\UDC Profiles\Drawing to PDF.xml");
 
            Profile.OutputLocation.Mode = LocationModeID.LM_PREDEFINED;
            Profile.OutputLocation.FolderPath = @"c:\UDC Output Files";
 
            Profile.PostProcessing.Mode = PostProcessingModeID.PP_OPEN_FOLDER;
 
            AutoCAD.AcadApplication App = new AutoCAD.AcadApplicationClass();
 
            double Version = double.Parse(App.Version.Substring(0, 4), new CultureInfo("en-US"));
 
            //Open drawing from file
            Object ReadOnly = false;
            Object Password = Type.Missing;
            AutoCAD.AcadDocument Doc = App.Documents.Open(AutoCADFilePath, ReadOnly, Password);
 
            //AutoCAD.Common.AcadPaperSpace ActiveSpace;
            AutoCAD.Common.AcadLayout Layout;
 
            //Change AutoCAD preferences for scaling the drawing to page
            if(Doc.ActiveSpace == 0)
                Layout = Doc.PaperSpace.Layout;
            else
                Layout = Doc.ModelSpace.Layout;
 
            Layout.PlotType = AutoCAD.Common.AcPlotType.acExtents;
            Layout.UseStandardScale = true;
            Layout.StandardScale = AutoCAD.Common.AcPlotScale.acScaleToFit;
            Layout.CenterPlot = true;
 
            Object nBACKGROUNDPLOT = 0, nFILEDIA = 0, nCMDDIA = 0;
            if(Version >= 16.1f)
            {
                nBACKGROUNDPLOT = Doc.GetVariable("BACKGROUNDPLOT");
                nFILEDIA = Doc.GetVariable("FILEDIA");
                nCMDDIA = Doc.GetVariable("CMDDIA");
 
                Object xNull = 0;
                Doc.SetVariable("BACKGROUNDPLOT", xNull);
                Doc.SetVariable("FILEDIA", xNull);
                Doc.SetVariable("CMDDIA", xNull);
            }
 
            Doc.Plot.QuietErrorMode = true;
 
            //Plot the drawing
            Doc.Plot.PlotToDevice("Universal Document Converter");
 
            if(Version >= 16.1f )
            {
                //Restore AutoCAD default preferences
                Doc.SetVariable("BACKGROUNDPLOT", nBACKGROUNDPLOT);
                Doc.SetVariable("FILEDIA", nFILEDIA);
                Doc.SetVariable("CMDDIA", nCMDDIA);
            }
 
            //Close drawing
            Object SaveChanges = false;
            Doc.Close(SaveChanges, Type.Missing);
 
            //Close Autodesk AutoCAD
            App.Quit();
        }
 
        static void Main(string[] args)
        {
            string TestFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "TestFile.dwg");
            PrintAutoCADtoPDF(TestFilePath);
        }
    }
}