Перевести принтер в режим Duplex

{ 
You typically switch a printer to duplex mode by changing its 
TDeviceMode(API: DEVMODE)record .But first you should test whether 
the installed printer driver supports this: 
}
 uses

   printers, winspool;

 function
 PrinterSupportsDuplex: Boolean;
 var

   Device, Driver, Port: array
[0..255] of
 Char;
   hDevMode: THandle;
 begin

   Printer.GetPrinter(Device, Driver, Port, hDevmode);
   Result :=
     WinSpool.DeviceCapabilities(Device, Port, DC_DUPLEX, nil
, nil
) <>
     0;
 end
;

 {if it does you can try to switch the duplex mode on before you call 
 richedit.print:}


 var

   Device, Driver, Port: array
[0..80] of
 Char;
   DevMode: THandle;
   pDevmode: PDeviceMode;
   begin

      // Get printer device mode handle. 
    Printer.GetPrinter(Device, Driver, Port, DevMode);
     if
 Devmode <> 0 then
 begin

        // lock it to get pointer to DEVMODE record 
      pDevMode := GlobalLock(Devmode);
       if
 pDevmode <> nil
 then

       try

         with
 pDevmode^ do
 begin

           dmDuplex := DMDUP_VERTICAL;
           dmFields := dmFields or
 DM_DUPLEX;
         end
;
       finally

         // unlock devmode handle. 
        GlobalUnlock(Devmode);
       end
;
     end
; { If }
   end
;

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