HOW TO: Print to PDF using Virtual Printers

// Step 0: Setup variables
string printerName = "Print to PDF";
string outputFolder = @"C:\temp";
DocumentWriter documentWriter = new DocumentWriter();

// Step 1: Install the printer
Printer.Install(new PrinterInfo()
{
   MonitorName = printerName,
   PortName = printerName,
   ProductName = printerName,
   Password = null, // No password
   RegistryKey = $@"SOFTWARE\LEAD Technologies, Inc.\20\Printer\{printerName}",
   RootDir = @"C:\LEADTOOLS 20\Bin\Common\PrinterDriver",
   Url = "https://www.leadtools.com",
   PrinterExe = new Uri(Assembly.GetExecutingAssembly().GetName().CodeBase).LocalPath,
   AboutString = "LEADTOOLS Printer",
   AboutIcon = @"C:\LEADTOOLS 20\Examples\Resources\RasterPro.ico"
});

// Step 2: Listen for print events
Printer printer = new Printer(printerName);
printer.EmfEvent += Printer_EmfEvent;
printer.JobEvent += Printer_JobEvent;

// Step 3: Handle the print jobs
void Printer_EmfEvent(object sender, EmfEventArgs e)
{
   // Load the data stream into a System.Drawing.Imaging.Metafile object
   using (Metafile metaFile = new Metafile(e.Stream))
      // Add to the current document
      documentWriter.AddPage(new DocumentWriterEmfPage()
      {
         EmfHandle = metaFile.GetHenhmetafile()
      };
}
void Printer_JobEvent(object sender, JobEventArgs e)
{
   switch (e.JobEventState)
   {
      case EventState.JobStart:
         // Begin writing to a new file
         documentWriter.BeginDocument(
            Path.Combine(outputFolder, $"{e.JobID}.pdf"), DocumentFormat.Pdf
         );
         break;
      case EventState.JobEnd:
         // Finished with file
         documentWriter.EndDocument();
         break;
   }
}