unit1.~pas

Delphi实效编程百例的随书源代码 这是其中的操作系统部分

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    PrintDialog1: TPrintDialog;
    Memo1: TMemo;
//    procedure FormCreate(Sender: TObject);
  //  procedure FormClick(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

//获取打印页边距


uses Printers;

procedure TForm1.Button1Click(Sender: TObject);
var
EscapeCode : integer;
Margin : TPoint;
begin
if PrintDialog1.Execute then begin
{$IFDEF WIN32}
Margin.x :=GetDeviceCaps(Printer.Handle, PHYSICALOFFSETX);
Margin.y :=GetDeviceCaps(Printer.Handle, PHYSICALOFFSETY);
{$ELSE}
EscapeCode := GETPRINTINGOFFSET;
if Escape(Printer.Handle,
QUERYESCSUPPORT,
sizeof(EscapeCode),
@EscapeCode,
nil) <> 0 then
if Escape(Printer.Handle,
GETPRINTINGOFFSET,
0,
nil,
@Margin) < 1 then begin
EscapeCode := GETPHYSPAGESIZE;
if Escape(Printer.Handle,
QUERYESCSUPPORT,
sizeof(EscapeCode),
@EscapeCode,
nil) <> 0 then
if Escape(Printer.Handle,
GETPHYSPAGESIZE,
0,
nil,
@Margin) > 0 then begin
Margin.x := (Margin.x -
GetDeviceCaps(Printer.Handle, HorzRes)) div 2;
Margin.y := (Margin.y -
GetDeviceCaps(Printer.Handle, VertRes)) div 2;
end else begin
Margin.x := 0;
Margin.y := 0;
end;
end;
{$ENDIF}
Memo1.Lines.Add(IntToStr(Margin.x));
Memo1.Lines.Add(IntToStr(Margin.y));
end;
end;







end.