چاپ دوطرفه با پرینترهای دو طرفه

سلام به همه اساتید حرفه ای
چطوری میتونیم در پرینترهایی که قابلیت چاپ دوطرفه را دارن پرینت دو طرفه انجام بدیم.
البته در صورت امکان بدون استفاده از ابزار های گزارش گیری.

{ 

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 ;