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Asked: 2026-05-26T08:30:27+00:00

How would I recode this to compile on 64-bit for Delphi XE2? On the

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How would I recode this to compile on 64-bit for Delphi XE2?

On the first code I get an error size is too large over 2gb.

On the second, Invalid Typecast on: if int64(TMethod(FOnChangeOO[i1])) = int64(TMethod(changeEvent)) then

1)
TExtBool = (no, yes, other);

  TAByte          = array [0..maxInt      -1] of byte;
  TAShortInt      = array [0..maxInt      -1] of shortInt;
  TAChar          = array [0..maxInt div sizeOf(Char)-1] of Char;
  TAAnsiChar      = array [0..maxInt      -1] of AnsiChar;
  TAWideChar      = array [0..maxInt shr 1-1] of WideChar;
  TABoolean       = array [0..maxInt      -1] of boolean;
  TAExtBool       = array [0..maxInt      -1] of TExtBool;
  TAWord          = array [0..maxInt shr 1-1] of word;
  TASmallInt      = array [0..maxInt shr 1-1] of smallInt;
  TACardinal      = array [0..maxInt shr 2-1] of cardinal;
  TAInteger       = array [0..maxInt shr 2-1] of integer;
  TAPointer       = array [0..maxInt shr 2-1] of pointer;
  TAString        = array [0..maxInt shr 2-1] of string;
  TAAnsiString    = array [0..maxInt shr 2-1] of AnsiString;
  TAWideString    = array [0..maxInt shr 2-1] of WideString;
  TAUnicodeString = array [0..maxInt shr 2-1] of UnicodeString;
  TAIUnknown      = array [0..maxInt shr 2-1] of IUnknown;
  TAInt64         = array [0..maxInt shr 3-1] of int64;

2)

TMethod = record code, data: pointer; end;
  TIListChangeEventOO = procedure (const list: ICustomBasicList; const item: IBasic;
                                   beforeChange: boolean;
                                   changeType: TChangeType; oldIndex, index: integer) of object;
  ICustomBasicList = interface (IList) ['{EE6D35A0-5F85-11D3-A52D-00005A180D69}']
  TChangeType = (lctUnchanged, lctChanged, lctNew, lctDeleted);
 IBasic = interface ['{53F8CE42-2C8A-11D3-A52D-00005A180D69}']


procedure TICustomBasicList.RegisterChangeEvent(changeEvent: TIListChangeEventOO);
var i1 : integer;
begin
  FSection.Enter;
  try
    if CheckValid then begin
      for i1 := 0 to high(FOnChangeOO) do
        if int64(TMethod(FOnChangeOO[i1])) = int64(TMethod(changeEvent)) then
          exit;
      i1 := Length(FOnChangeOO);
      SetLength(FOnChangeOO, i1 + 1);
      FOnChangeOO[i1] := changeEvent;
    end;
  finally FSection.Leave end;
end;

function TICustomBasicList.UnregisterChangeEvent(changeEvent: TIListChangeEvent) : boolean;
var i1, i2 : integer;
begin
  result := false;
  FSection.Enter;
  try
    i2 := high(FOnChange);
    for i1 := i2 downto 0 do
      if @FOnChange[i1] = @changeEvent then begin
        FOnChange[i1] := FOnChange[i2];
        dec(i2);
        result := true;
        FSuccess := true;
      end;
    if result then SetLength(FOnChange, i2 + 1)
    else           SetLastError(ERROR_FILE_NOT_FOUND);
  finally FSection.Leave end;
end;
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1 Answer

  1. Editorial Team

    1) Instead of “shr 1/2/3” you should always use SizeOf(T) because “shr 2 = div 4” is not equal to “div SizeOf(Pointer)” in 64 bit. The same for UnicodeString, WideString, IUnknown, …

    2) TMethod is a record with two pointers. In 32 bit, the two pointers need 8 bytes (32bit * 2). In 64 bit, the two pointers need 16 bytes (64bit * 2). And an Int64 can’t hold 128 bit. So you now have to compare the two fields directly instead of casting it.

    if (TMethod(FOnChangeOO[i1]).Data = TMethod(changeEvent).Data) and
   (TMethod(FOnChangeOO[i1]).Code = TMethod(changeEvent).Code) then
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