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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    ComboBox1: TComboBox;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses
  Printers;

function GetDefaultPrinter: string;
var
  ResStr: array[0..255] of Char;
begin
  GetProfileString('Windows', 'device', '', ResStr, 255);
  Result := StrPas(ResStr);
end;

procedure SetDefaultPrinter(PrinterName: string);
var
  I: Integer;
  Device: PChar;
  Driver: PChar;
  Port: PChar;
  HdeviceMode: THandle;
  aPrinter: TPrinter;
begin
  Printer.PrinterIndex := -1;
  GetMem(Device, 255);
  GetMem(Driver, 255);
  GetMem(Port, 255);
  aPrinter := TPrinter.Create;
  try
    for I := 0 to Printer.Printers.Count - 1 do
    begin
      if Printer.Printers[i] = PrinterName then
      begin
        aprinter.PrinterIndex := i;
        aPrinter.getprinter(device, driver, port, HdeviceMode);
        StrCat(Device, ',');
        StrCat(Device, Driver);
        StrCat(Device, Port);
        WriteProfileString('windows', 'device', Device);
        StrCopy(Device, 'windows');
        SendMessage(HWND_BROADCAST, WM_WININICHANGE,
          0, Longint(@Device));
      end;
    end;
  finally
    aPrinter.Free;
  end;
  FreeMem(Device, 255);
  FreeMem(Driver, 255);
  FreeMem(Port, 255);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  SetDefaultPrinter(Combobox1.Text);
end;


procedure TForm1.FormCreate(Sender: TObject);
begin
  Combobox1.Items.Clear;
  Combobox1.Items.AddStrings(Printer.Printers);
  Combobox1.Text:=GetDefaultPrinter;
end;

end.