unit1.pas

在delphi中实现windows核心编程.原书光盘代码核心编程.原书光盘代码

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  hDeviceHandle: Thandle;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
const
  BytesPerSector=512;
  SectorCount=1;
  SectorStart=0;
  drive='\\.\C:';
var
  str:string;
  p:pchar;
  i:Cardinal;
begin
  hDeviceHandle := CreateFile(drive, GENERIC_ALL,  //如果只是读扇区,可以用GENERIC_READ
    FILE_SHARE_READ or FILE_SHARE_WRITE, nil, OPEN_EXISTING,0, 0);
  if (hDeviceHandle <> INVALID_HANDLE_VALUE) then
  begin
    p:=allocmem(SectorCount*BytesPerSector);

    FileSeek(hDevicehandle,SectorStart*BytesPerSector,0);
    if FileRead(hDevicehandle,p[0],SectorCount*BytesPerSector)<>SectorCount*BytesPerSector then
       raise exception.create('Read错误');

    str:='';
    for i:=0 to 512-1 do
    begin
      str:=str+format('%.2x',[integer(p[i])]);
      if i mod 16=15 then str:=str+#13;
    end;
    showmessage(str);

    FileSeek(hDevicehandle,SectorStart*BytesPerSector,0);
    if FileWrite(hDevicehandle,p[0],SectorCount*BytesPerSector)<>SectorCount*BytesPerSector then
       raise exception.create('Write错误%d');

    freemem(p,SectorCount*BytesPerSector);
    closehandle(hDeviceHandle);
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
const
  BytesPerSector=512;
  SectorCount=1;
  SectorStart=0;
  drive='\\.\PHYSICALDRIVE0';
var
  str:string;
  p:pchar;
  i:Cardinal;
begin
  hDeviceHandle := CreateFile(drive, GENERIC_ALL,  //如果只是读扇区,可以用GENERIC_READ
    FILE_SHARE_READ or FILE_SHARE_WRITE, nil, OPEN_EXISTING,0, 0);
  if (hDeviceHandle <> INVALID_HANDLE_VALUE) then
  begin
    p:=allocmem(SectorCount*BytesPerSector);

    FileSeek(hDevicehandle,SectorStart*BytesPerSector,0);
    if FileRead(hDevicehandle,p[0],SectorCount*BytesPerSector)<>SectorCount*BytesPerSector then
       raise exception.create('Read错误');

    str:='';
    for i:=0 to 512-1 do
    begin
      str:=str+format('%.2x',[integer(p[i])]);
      if i mod 16=15 then str:=str+#13;
    end;
    showmessage(str);

    FileSeek(hDevicehandle,SectorStart*BytesPerSector,0);
    if FileWrite(hDevicehandle,p[0],SectorCount*BytesPerSector)<>SectorCount*BytesPerSector then
       raise exception.create('Write错误%d');

    freemem(p,SectorCount*BytesPerSector);
    closehandle(hDeviceHandle);
  end;
end;

end.