Tips dan Trik Delphi - Printing

uses WinSpool;
... 
procedure TForm1.Button1Click(Sender: TObject);
var
  NewDevMode: TDeviceModeA;
  MyDir: PChar;
  Int: Integer;
begin
  GetMem(MyDir, 500);
  GetPrinterDriverDirectory(nil, nil, 1, MyDir, 200, Int);
  Label1.Caption:=StrPas(MyDir);
  FreeMem(MyDir);
end;

                                        

uses
  Printers;

function GetPixelsPerInchX: Integer;
begin
  Result := GetDeviceCaps(Printer.Handle, LOGPIXELSX)
end;

function GetPixelsPerInchY: Integer;
begin
  Result := GetDeviceCaps(Printer.Handle, LOGPIXELSY)
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  Caption := Format('x: %d y: %d DPI (dots per inch)',
                   [GetPixelsPerInchX, GetPixelsPerInchY]);
end;

uses
  Printers, Messages;

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

procedure SetDefaultPrinter1(NewDefPrinter: string);
var
  ResStr: array[0..255] of Char;
begin
  StrPCopy(ResStr, NewdefPrinter);
  WriteProfileString('windows', 'device', ResStr);
  StrCopy(ResStr, 'windows');
  SendMessage(HWND_BROADCAST, WM_WININICHANGE, 0, Longint(@ResStr));
end;

procedure SetDefaultPrinter2(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 = 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
  label1.Caption := GetDefaultPrinter2;
end;

//Fill the combobox with all available printers
procedure TForm1.FormCreate(Sender: TObject);
begin
  Combobox1.Items.Clear;
  Combobox1.Items.AddStrings(Printer.Printers);
end;

//Set the selected printer in the combobox as default printer
procedure TForm1.Button2Click(Sender: TObject);
begin
  SetDefaultPrinter(Combobox1.Text);
end;

uses QRPrntr;

procedure SaveQuickReportToStream(AQuickReport: TQuickRep; AStream: TStream);
var
  PL: TQRPageList;
  I: Integer;
begin
  PL := nil;
  try
    PL := TQRPageList.Create;
    PL.Stream := TQRStream.Create(100000);
    AQuickReport.Prepare;
    PL.LockList;
    try
      for I := 1 to AQuickReport.QRPrinter.PageCount do
        PL.AddPage(AQuickReport.QRPrinter.GetPage(I));
      PL.Finish;
    finally
      PL.UnlockList;
    end;
    PL.Stream.SaveToStream(AStream);
  finally
    FreeAndNil(PL);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  stream: TFileStream;
begin
  stream := TFileStream.Create('c:\quickreport.dat', fmCreate);
  QuickReportToStream(QuickRep1, stream);
  stream.Free;
end;