function fun_FastOpenFileClear(const str_param_FilePath:string;
                               const dword_param_Size:DWORD):Boolean ;
var
  handle_File, handle_MapFile : THandle ;

  file_Point : Pointer ;

begin
  Result := False ;

  handle_File := CreateFile(PChar(str_param_FilePath),
                            GENERIC_WRITE or GENERIC_READ,
                            FILE_SHARE_READ,
                            nil,
                            OPEN_EXISTING,
                            FILE_ATTRIBUTE_NORMAL,
                            0) ;
  if handle_File = INVALID_HANDLE_VALUE then
  begin
    Exit ;
  end;

  handle_MapFile := CreateFileMapping(handle_File,
                                     nil,
                                     PAGE_READWRITE,
                                     0,
                                     dword_param_Size,
                                     nil) ;
  if handle_MapFile = 0 then
  begin
    CloseHandle(handle_File) ;
    Exit ;
  end;

  // 映射并清0
  file_Point := MapViewOfFile(handle_MapFile,
                              FILE_MAP_READ or FILE_MAP_WRITE,
                              0,
                              0,
                              0) ;
  ZeroMemory(file_Point, dword_param_Size) ;

  // 释放资源
  UnmapViewOfFile(file_Point) ;
  CloseHandle(handle_MapFile) ;
  CloseHandle(handle_File)    ;

  Result := True ;

end;// End fun_FastOpenFileClear()

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