Type

  // Types needed to make this work. These should be moved to the system unit.
  
  currency            = int64;
  HRESULT             = Longint;
  PSmallInt           = ^Smallint;
  PLongint            = ^Longint;
  PSingle             = ^Single;
  PDouble             = ^Double;    
  PCurrency           = ^Currency;
  TDateTime           = Double;
  PDate               = ^TDateTime;
  PPWideChar          = ^PWideChar;    
  Error               = Longint;  
  PError              = ^Error;
  PWordBool           = ^WordBool;
  PByte               = ^Byte;
 
  EVarianterror = Class(Exception)
    ErrCode : longint;
    Constructor CreateCode(Code : Longint);
  end;
  
  TVarArrayBound = packed record
    ElementCount: Longint;
    LowBound: Longint;
  end;
  TVarArrayBoundArray = Array [0..0] of TVarArrayBound;
  PVarArrayBoundArray = ^TVarArrayBoundArray;
  TVarArrayCoorArray  = Array [0..0] of Longint;
  PVarArrayCoorArray  = ^TVarArrayCoorArray;

  PVarArray = ^TVarArray;
  TVarArray = packed record
    DimCount: Word;
    Flags: Word;
    ElementSize: Longint;
  LockCount: Integer;
    Data: Pointer;
    Bounds: TVarArrayBoundArray;
  end;
      
  TVarType = Word;
  PVarData = ^TVarData;
  TVarData = packed record
    VType: TVarType;
    case Integer of
      0: (Reserved1: Word;
          case Integer of
            0: (Reserved2, Reserved3: Word;
                case Integer of
                  varSmallInt: (VSmallInt: SmallInt);
                  varInteger:  (VInteger: Longint);
                  varSingle:   (VSingle: Single);
                  varDouble:   (VDouble: Double);
                  varCurrency: (VCurrency: Currency);
                  varDate:     (VDate: Double);
                  varOleStr:   (VOleStr: PWideChar);
                  varDispatch: (VDispatch: Pointer);
                  varError:    (VError: LongWord);
                  varBoolean:  (VBoolean: WordBool);
                  varUnknown:  (VUnknown: Pointer);
                  varByte:     (VByte: Byte);
                  varString:   (VString: Pointer);
                  varAny:      (VAny: Pointer);
                  varArray:    (VArray: PVarArray);
                  varByRef:    (VPointer: Pointer);
         );
            1: (VLongs: array[0..2] of LongInt);
         );
      2: (VWords: array [0..6] of Word);
      3: (VBytes: array [0..13] of Byte);
  end;
  Variant = TVarData;
  PVariant = ^Variant;

{ Variant functions }  

function VariantChangeTypeEx(var VargDest: TVarData; const VargSrc: TVarData; LCID: Integer; Flags: Word; VarType: Word): HRESULT; stdcall;
function VariantClear(var Varg: TVarData): HRESULT; stdcall;
function VariantCopy(var VargDest: TVarData; const VargSrc: TVarData): HRESULT; stdcall;
function VariantCopyInd(var VargDest: TVarData;  const VargSrc: TVarData): HRESULT; stdcall;
function VariantInit(var Varg: TVarData): HRESULT; stdcall;

{  Variant array functions }

function SafeArrayAccessData(psa: PVarArray; var ppvdata: Pointer): HRESULT; stdcall;
function SafeArrayAllocData(psa: PVarArray): HRESULT; stdcall;
function SafeArrayAllocDescriptor(DimCount: Integer; var psa: PVarArray): HRESULT; stdcall;
function SafeArrayCopy(psa: PVarArray; var psaout: PVarArray): HRESULT; stdcall;
function SafeArrayCopyData(psa, psaOut: PVarArray): HRESULT; stdcall;
function SafeArrayCreate(VarType, Dim: Integer; const Bounds: TVarArrayBoundArray): PVarArray; stdcall;
function SafeArrayDestroy(psa: PVarArray): HRESULT; stdcall;
function SafeArrayDestroyData(psa: PVarArray): HRESULT; stdcall;
function SafeArrayDestroyDescriptor(psa: PVarArray): HRESULT; stdcall;
function SafeArrayGetDim(psa: PVarArray): Integer; stdcall;
function SafeArrayGetElemSize(psa: PVarArray): LongWord; stdcall;
function SafeArrayGetElement(psa: PVarArray; Indices: PVarArrayCoorArray;  Data: Pointer): HRESULT; stdcall;
function SafeArrayGetLBound(psa: PVarArray; Dim: Integer;  var LBound: Integer): HRESULT; stdcall;
function SafeArrayGetUBound(psa: PVarArray; Dim: Integer;  var UBound: Integer): HRESULT; stdcall;
function SafeArrayLock(psa: PVarArray): HRESULT; stdcall;
function SafeArrayPtrOfIndex(psa: PVarArray; Indices: PVarArrayCoorArray;  var Address: Pointer): HRESULT; stdcall;
function SafeArrayPutElement(psa: PVarArray; Indices: PVarArrayCoorArray;  const Data: Pointer): HRESULT; stdcall;
function SafeArrayRedim(psa: PVarArray; const NewBound: TVarArrayBound): HRESULT; stdcall;
function SafeArrayUnaccessData(psa: PVarArray): HRESULT; stdcall;
function SafeArrayUnlock(psa: PVarArray): HRESULT; stdcall;

{ Conversion routines NOT in windows oleaut }

Function VariantToSmallInt(Const VargSrc : TVarData) : SmallInt;
Function VariantToLongint(Const VargSrc : TVarData) : Longint;
Function VariantToSingle(Const VargSrc : TVarData) : Single;
Function VariantToDouble(Const VargSrc : TVarData) : Double;
Function VariantToCurrency(Const VargSrc : TVarData) : Currency;
Function VariantToDate(Const VargSrc : TVarData) : TDateTime;
Function VariantToBoolean(Const VargSrc : TVarData) : Boolean;
Function VariantToByte(Const VargSrc : TVarData) : Byte;


// Names match the ones in Borland varutils unit.

const
  VAR_OK            = HRESULT($00000000); 
  VAR_TYPEMISMATCH  = HRESULT($80020005); 
  VAR_BADVARTYPE    = HRESULT($80020008); 
  VAR_EXCEPTION     = HRESULT($80020009); 
  VAR_OVERFLOW      = HRESULT($8002000A); 
  VAR_BADINDEX      = HRESULT($8002000B); 
  VAR_ARRAYISLOCKED = HRESULT($8002000D); 
  VAR_NOTIMPL       = HRESULT($80004001); 
  VAR_OUTOFMEMORY   = HRESULT($8007000E); 
  VAR_INVALIDARG    = HRESULT($80070057); 
  VAR_UNEXPECTED    = HRESULT($8000FFFF); 

  ARR_NONE          = $0000;  
  ARR_FIXEDSIZE     = $0010;  
  ARR_OLESTR        = $0100;
  ARR_UNKNOWN       = $0200; 
  ARR_DISPATCH      = $0400;
  ARR_VARIANT       = $0800;