Print a canvas

uses
  Printers;

procedure PrintCanvas(TextToPrint: string);
begin
  with Printer do
  begin
    BeginDoc;
    Canvas.TextOut(5, 50, TexttoPrint);
    EndDoc;
  end;
end;

Detect Printer status

function TestPrinterStatus(LPTPort: Word): Byte;
var
  Status: byte;
  CheckLPT: word;
begin
  Status := 0;
  if (LPTPort >= 1) and (LPTPort <= 3) then
  begin
    CheckLPT := LPTPort - 1;
    asm
      mov dx, CheckLPT;
      mov al, 0;
      mov ah, 2;
      int 17h;
      mov &Status, ah;
    end;
  end;
  Result := Status;
end;


{
  Pass in the LPT port number you want to check & get the following back:
  01h - Timeout
  08h - I/O Error
  10h - Printer selected
  20h - Out of paper
  40h - Printer acknowledgement
  80h - Printer not busy (0 if busy)

  Note:
  This function doesn't work under NT, it gives an access violation
  from the DOS interrupt call.
}

Autor: Colombo Gianluca
Homepage: http://www.digitstudios.com

Get the available printers

uses
printers;

ComboBox1.Items.Assign(Printer.Printers);

List print-jobs in a printer-queue

uses
  Winspool, Printers;

function GetCurrentPrinterHandle: THandle;
var
  Device, Driver, Port: array[0..255] of Char;
  hDeviceMode: THandle;
begin
  Printer.GetPrinter(Device, Driver, Port, hDeviceMode);
  if not OpenPrinter(@Device, Result, nil) then
    RaiseLastWin32Error;
end;

function SavePChar(p: PChar): PChar;
const
  error: PChar = 'Nil';
begin
  if not Assigned(p) then
    Result := error
  else
    Result := p;
end;

procedure TForm1.Button1Click(Sender: TObject);
type
  TJobs  = array [0..1000] of JOB_INFO_1;
  PJobs = ^TJobs;
var
  hPrinter: THandle;
  bytesNeeded, numJobs, i: Cardinal;
  pJ: PJobs;
begin
  hPrinter := GetCurrentPrinterHandle;
  try
    EnumJobs(hPrinter, 0, 1000, 1, nil, 0, bytesNeeded,
      numJobs);
    pJ := AllocMem(bytesNeeded);
    if not EnumJobs(hPrinter, 0, 1000, 1, pJ, bytesNeeded,
      bytesNeeded, numJobs) then
      RaiseLastWin32Error;

    memo1.Clear;
    if numJobs = 0 then
      memo1.Lines.Add('No jobs in queue')
    else
      for i := 0 to Pred(numJobs) do
        memo1.Lines.Add(Format('Printer %s, Job %s, Status (%d): %s',
          [SavePChar(pJ^[i].pPrinterName), SavePChar(pJ^[i].pDocument),
          pJ^[i].Status, SavePChar(pJ^[i].pStatus)]));
  finally
    ClosePrinter(hPrinter);
  end;
end;

Autor: P. Below
Homepage: http://www.teamb.com

Check, if the current printer prints in color

uses
  Printers, WinSpool;

procedure TForm1.Button1Click(Sender: TObject);
var
  Dev, Drv, Prt: array[0..255] of Char;
  DM1: PDeviceMode;
  DM2: PDeviceMode;
  Sz: Integer;
  DevM: THandle;
begin
  Printer.PrinterIndex := -1;
  Printer.GetPrinter(Dev, Drv, Prt, DevM);
  DM1 := nil;
  DM2 := nil;
  Sz  := DocumentProperties(0, 0, Dev, DM1^, DM2^, 0);
  GetMem(DM1, Sz);
  DocumentProperties(0, 0, Dev, DM1^, DM2^, DM_OUT_BUFFER);
  if DM1^.dmColor > 1 then
    label1.Caption := Dev + ': Color'
  else
    label1.Caption := Dev + ': Black and White';
  if DM1^.dmFields and DM_Color <> 0 then
    Label2.Caption := 'Printer supports color printing'
  else
    Label2.Caption := 'Printer does not support color printing';
  FreeMem(DM1);
end;

Autor: Michael Winter

Determine the minimum margins for a printer

uses
  Printers;

type
  TMargins = record
    Left,
    Top,
    Right,
    Bottom: Double
end;

procedure GetPrinterMargins(var Margins: TMargins);
var
  PixelsPerInch: TPoint;
  PhysPageSize: TPoint;
  OffsetStart: TPoint;
  PageRes: TPoint;
begin
  PixelsPerInch.y := GetDeviceCaps(Printer.Handle, LOGPIXELSY);
  PixelsPerInch.x := GetDeviceCaps(Printer.Handle, LOGPIXELSX);
  Escape(Printer.Handle, GETPHYSPAGESIZE, 0, nil, @PhysPageSize);
  Escape(Printer.Handle, GETPRINTINGOFFSET, 0, nil, @OffsetStart);
  PageRes.y := GetDeviceCaps(Printer.Handle, VERTRES);
  PageRes.x := GetDeviceCaps(Printer.Handle, HORZRES);
  // Top Margin
  Margins.Top := OffsetStart.y / PixelsPerInch.y;
  // Left Margin
  Margins.Left := OffsetStart.x / PixelsPerInch.x;
  // Bottom Margin
  Margins.Bottom := ((PhysPageSize.y - PageRes.y) / PixelsPerInch.y) -
    (OffsetStart.y / PixelsPerInch.y);
  // Right Margin
  Margins.Right := ((PhysPageSize.x - PageRes.x) / PixelsPerInch.x) -
    (OffsetStart.x / PixelsPerInch.x);
end;

function InchToCm(Pixel: Single): Single;
// Convert inch to Centimeter
begin
  Result := Pixel * 2.54
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  Margins: TMargins;
begin
 GetPrinterMargins(Margins);
 ShowMessage(Format('Margins: (Left: %1.3f, Top: %1.3f, Right: %1.3f, Bottom: %1.3f)',
  [InchToCm(Margins.Left),
   InchToCm(Margins.Top),
   InchToCm(Margins.Right),
   InchToCm(Margins.Bottom)]));
end;

Autor: Thomas Stutz

Implement Print/Page Setup/etc ... with TWebBrowser

TWebBrowser can use native IE API to print and do other things.
Implement on a Form a TWebBrowser component, and a button to print.
The code attached to this button is as follow :

procedure TForm.OnClickPrint(Sender: TObject);
begin
  WebBrowser.ExecWB(OLECMDID_PRINT, OLECMDEXECOPT_PROMPTUSER);
end;

You can replace "OLECMDID_PRINT" by other possibilities :

OLECMDID_OPEN OLECMDID_NEW OLECMDID_SAVE
OLECMDID_SAVEAS OLECMDID_SAVECOPYAS OLECMDID_PRINT
OLECMDID_PRINTPREVIEW OLECMDID_PAGESETUP OLECMDID_SPELL
OLECMDID_PROPERTIES OLECMDID_CUT OLECMDID_COPY
OLECMDID_PASTE OLECMDID_PASTESPECIAL OLECMDID_UNDO
OLECMDID_REDO OLECMDID_SELECTALL OLECMDID_CLEARSELECTION
OLECMDID_ZOOM OLECMDID_GETZOOMRANGE OLECMDID_UPDATECOMMANDS

OLECMDID_REFRESH OLECMDID_STOP OLECMDID_HIDETOOLBARS
OLECMDID_SETPROGRESSMAX OLECMDID_SETPROGRESSPOS
OLECMDID_SETPROGRESSTEXT

OLECMDID_SETTITLE OLECMDID_SETDOWNLOADSTATE OLECMDID_STOPDOWNLOAD

OLECMDID_FIND OLECMDID_ONTOOLBARACTIVATED OLECMDID_DELETE

OLECMDID_HTTPEQUIV OLECMDID_ENABLE_INTERACTION OLECMDID_HTTPEQUIV_DONE

OLECMDID_ONUNLOAD OLECMDID_PROPERTYBAG2 OLECMDID_PREREFRESH



Autor: Franck BRUNET
Homepage: http://beastcorp.free.fr

Find the port of a named printer device

{You need this Code to get the Port for a Printer.}

uses registry;

function Get_Printerport(Printername: String): string;
var
  Reg: TRegistry;
begin
  Reg := TRegistry.Create;
  with Reg do
  begin
    RootKey := HKEY_LOCAL_MACHINE;
     if OpenKey('\System\CurrentControlSet\Control\Print\printers\' + Printername + '\', True) then
       if ValueExists('port') then
       Result := Readstring('port');
      CloseKey;
  end;
end;

Determine printers port and name

{ .... }

TYPE
   TPrinterDevice = CLASS {type definition NOT interfaced by Printers.pas}
      Driver, Device, Port: STRING;
   END;

{ .... }

USES Printers;

{ .... }

FUNCTION GetCurrentPrinterPort: STRING;
BEGIN
   Result := TPrinterDevice(Printer.Printers.Objects[Printer.PrinterIndex]).Port;
END;

{The exact printer's name known to Windows for use in API calls can be obtained by:}

FUNCTION GetCurrentPrinterName: STRING;
BEGIN
   Result := TPrinterDevice(Printer.Printers.Objects[Printer.PrinterIndex]).Device;
END;


// Example:

PROCEDURE TForm1.Button1Click(Sender: TObject);
BEGIN
   Label1.Caption := GetCurrentPrinterPort;
   Label2.Caption := GetCurrentPrinterName;
END;

Autor: Mad Byte

Get the name of the default printer

UNIT printers;


BEGIN
  //...
   Printer.PrinterIndex := -1;
   DefaultPrnName := Printer.Printers.Strings[Printer.PrinterIndex];
  //...
END;