Delphi写内存补丁如何写成偏移补丁,求大牛指点下啊

源程序如下:
unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
var
NewData : array[0..1] of byte = ($90,$90);
Bytesread : DWORD;
procedure TForm1.Button1Click(Sender: TObject);
var
hwin, pid: DWORD;
hprocess: DWORD;
begin
hwin := FindWindow(nil,'CM Test');
GetWindowThreadProcessId(hwin, pid);
hprocess := OpenProcess(PROCESS_ALL_ACCESS, False, pid);
if WriteProcessMemory(hProcess ,Pointer($004566EE),@newdata,2 ,BytesRead ) then        //指定地址004566EE
begin
CloseHandle(hProcess);
label1.Caption:='      指定目标已经K.O了　';
end
else
begin
CloseHandle(hProcess);
label1.Caption:=' 指定目标不知道为啥失败了　';
end;
end;
end.

按照上面的方法只能写固定的内存补丁,请问下有哪位大牛知道怎么取模块地址写偏移补丁吗