Von C++ nach Delphi (Union + Struct)

[omata]

Zweiter Vorschlag:

Delphi-Quellcode:

type
  TBMRecContent = record
    Recipient: Byte;
    Reserved: Byte;
    _Type: Byte;
    Dir: Byte;
  end;

  TBMRec = record
    data : Byte;
  end;

  _BM_REQUEST_TYPE = packed record
    case Byte of
      0 : (_BM: TBMRec);
      1 : (B: Byte);
  end;

:

implementation

:

function getBMRecContent(BM_REQUEST_TYPE:_BM_REQUEST_TYPE): TBMRecContent;
begin
  Result.Recipient:= (BM_REQUEST_TYPE._BM.data shr 6) and 3;
  Result.Reserved:= (BM_REQUEST_TYPE._BM.data shr 3) and 7;
  Result._Type:= (BM_REQUEST_TYPE._BM.data shr 1) and 3;
  Result.Dir:= (BM_REQUEST_TYPE._BM.data and 1);
end;

procedure TForm.ButtonClick(Sender: TObject);
var BM_REQUEST_TYPE: _BM_REQUEST_TYPE;
begin
  BM_REQUEST_TYPE._BM.data:=3;
  ShowMessage(Format(
    'Recipient = %d, Reserved = %d, Type = %d, Dir = %d',
    [getBMRecContent(BM_REQUEST_TYPE).Recipient,
     getBMRecContent(BM_REQUEST_TYPE).Reserved,
     getBMRecContent(BM_REQUEST_TYPE)._Type,
     getBMRecContent(BM_REQUEST_TYPE).Dir]
  ));
end;