问如何在不同dpi的打印机上使用相同的ZPL代码

EN

... 
using System.Printing;
...

var ps = new PrintServer();
var queues = ps.GetPrintQueues(
new[] { EnumeratedPrintQueueTypes.Local, EnumeratedPrintQueueTypes.Connections });

var bool Is200dpi = false;
var bool Is300dpi = false;
var int  ActualDPI = 203; // just some default    
foreach (var queue in queues)
{
   if (queue.Name.Trim().Equals( "ThePrinterOnYourMachine" ))
   {
      var pt = queue.DefaultPrintTicket;
      if (pt.PageResolution.X >= 200 && pt.PageResolution.X <= 203)
         Is200dpi = true;
      else if (pt.PageResolution.X >= 300 && pt.PageResolution.X <= 303)
         Is300dpi = true;

      ActualDPI = pt.PageResolution.X;

      // done, don't need to look at any other printers
      break;
   }
}