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PRINTERS.INT
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1996-05-08
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{*******************************************************}
{ }
{ Delphi Visual Component Library }
{ }
{ Copyright (c) 1995,96 Borland International }
{ }
{*******************************************************}
unit Printers;
{$R-}
interface
uses Windows, WinSpool, SysUtils, Classes, Graphics, Forms;
type
EPrinter = class(Exception);
{ TPrinter }
{ The printer object encapsulates the printer interface of Windows. A print
job is started whenever any redering is done either through a Text variable
or the printers canvas. This job will stay open until EndDoc is called or
the Text variable is closed. The title displayed in the Print Manager (and
on network header pages) is determined by the Title property.
EndDoc - Terminates the print job (and closes the currently open Text).
The print job will being printing on the printer after a call to EndDoc.
NewPage - Starts a new page and increments the PageNumber property. The
pen position of the Canvas is put back at (0, 0).
Canvas - Represents the surface of the currently printing page. Note that
some printer do not support drawing pictures and the Draw, StretchDraw,
and CopyRect methods might fail.
Fonts - The list of fonts supported by the printer. Note that TrueType
fonts appear in this list even if the font is not supported natively on
the printer since GDI can render them accurately for the printer.
PageHeight - The height, in pixels, of the page.
PageWidth - The width, in pixels, of the page.
PageNumber - The current page number being printed. This is incremented
when ever the NewPage method is called. (Note: This property can also be
incremented when a Text variable is written, a CR is encounted on the
last line of the page).
PrinterIndex - Specifies which printer in the TPrinters list that is
currently selected for printing. Setting this property to -1 will cause
the default printer to be selected. If this value is changed EndDoc is
called automatically.
Printers - A list of the printers installed in Windows.
Title - The title used by Windows in the Print Manager and for network
title pages. }
TPrinterState = (psNoHandle, psHandleIC, psHandleDC);
TPrinterOrientation = (poPortrait, poLandscape);
TPrinterCapability = (pcCopies, pcOrientation, pcCollation);
TPrinterCapabilities = set of TPrinterCapability;
TPrinter = class(TObject)
public
constructor Create;
destructor Destroy; override;
procedure Abort;
procedure BeginDoc;
procedure EndDoc;
procedure NewPage;
procedure GetPrinter(ADevice, ADriver, APort: PChar; var ADeviceMode: THandle);
procedure SetPrinter(ADevice, ADriver, APort: PChar; ADeviceMode: THandle);
property Aborted: Boolean;
property Canvas: TCanvas;
property Capabilities: TPrinterCapabilities;
property Copies: Integer;
property Fonts: TStrings;
property Handle: HDC;
property Orientation: TPrinterOrientation;
property PageHeight: Integer;
property PageWidth: Integer;
property PageNumber: Integer;
property PrinterIndex: Integer;
property Printing: Boolean;
property Printers: TStrings;
property Title: string;
end;
{ Printer function - Replaces the Printer global variable of previous versions,
to improve smart linking (reduce exe size by 2.5k in projects that don't use
the printer). Code which assigned to the Printer global variable
must call SetPrinter instead. SetPrinter returns current printer object
and makes the new printer object the current printer. It is the caller's
responsibility to free the old printer, if appropriate. (This allows
toggling between different printer objects without destroying configuration
settings.) }
function Printer: TPrinter;
function SetPrinter(NewPrinter: TPrinter): TPrinter;
{ AssignPrn - Assigns a Text variable to the currently selected printer. Any
Write or Writeln's going to that file variable will be written on the
printer using the Canvas property's font. A new page is automatically
started if a CR is encountered on (or a Writeln is written to) the last
line on the page. Closing the text file will imply a call to the
Printer.EndDoc method. Note: only one Text variable can be open on the
printer at a time. Opening a second will cause an exception.}
procedure AssignPrn(var F: Text);
implementation