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Ich nutz dazu folgenden Code... Einfach die Eigenschaft SetDefaultPrinterName setzen und lesen.

Delphi-Quellcode:

unit PrinterSettings;

interface
uses windows, sysutils, classes, messages ;

function GetDefaultPrinterA(prnName : PAnsiChar; var bufSize : DWORD ) : BOOL; stdcall;
       external 'winspool.drv' name 'GetDefaultPrinterA';

type
 TPrinterSettings = class
  private
    function getDefaultPrinterName: string;
    procedure SetDefaultPrinterName(const Value: string);
 public
    property DefaultPrinterName : string read GetDefaultPrinterName write SetDefaultPrinterName ;
 end ;

var
 PS : TPrinterSettings ;

implementation
uses printers ;

function TPrinterSettings.getDefaultPrinterName:string;
begin
     try
        Result := Printer.Printers[Printers.Printer.PrinterIndex] ;
     except
        Result := '' ;
     end ;
end;

procedure TPrinterSettings.SetDefaultPrinterName(const Value: string);
var
  Device: array[0..255] of char; 
  Driver: array[0..255] of char; 
  Port: array[0..255] of char; 
  hDeviceMode: THandle; 
begin
  if Printer.Printers.IndexOf (Value) >= 0 then begin
      Printer.PrinterIndex :=  Printer.Printers.IndexOf (Value) ;
      Printer.GetPrinter(Device, Driver, Port, hDeviceMode);
      StrCat( Device, ',');
      StrCat( Device, Driver );
      StrCat( Device, ',');
      StrCat( Device, Port );
      WriteProfileString( 'windows', 'device', Device );
      StrCopy( Device, 'windows' );
      SendMessage( HWND_BROADCAST, WM_WININICHANGE, 0, longint( @Device ));
      sleep (300) ;
  end else begin

  end ;
end;



initialization
   PS := TPrinterSettings.create ;
finalization
   PS.free ;
end.