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Variant variables

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Variant variables

 

thinBasic supports VARIANT variables. You can think of a VARIANT as a kind of container, which can hold a variable of most any data type, numeric, string.

You can use a VARIANT variable like all other variables. thinBasic will take care of all needed internal data conversions.

You may determine the type of data a VARIANT variable contains with the VARIANTVT and VARIANTVT$ functions.

 

The following table summarizes the predefined (built-in) equates that can be used to examine a Variant:

 

Result

Equate

Meaning

0

%VT_EMPTY

0 or Empty string

1

%VT_NULL

Null string

2

%VT_I2

Integer

3

%VT_I4

Long-integer

4

%VT_R4

Single

5

%VT_R8

Double

6

%VT_CY

Currency

7

%VT_DATE

Date

8

%VT_BSTR

Dynamic string

9

%VT_DISPATCH

Interface reference

10

%VT_ERROR

Error code

11

%VT_BOOL

Boolean

12

%VT_VARIANT

Variant

13

%VT_UNKNOWN


16

%VT_I1

Byte

17

%VT_UI1

Byte

18

%VT_UI2

Word

19

%VT_UI4

DWORD

20

%VT_I8

Quad (signed)

21

%VT_UI8

Quad (unsigned)

22

%VT_INT

Integer

23

%VT_UINT

Word

24

%VT_VOID


25

%VT_HRESULT

COM result code

26

%VT_PTR

Pointer

27

%VT_SAFEARRAY

VB Array

28

%VT_CARRAY


29

%VT_USERDEFINED


30

%VT_LPSTR

ANSI string

31

%VT_LPWSTR

Unicode string

64

%VT_FILETIME


65

%VT_BLOB


66

%VT_STREAM


67

%VT_STORAGE


68

%VT_STREAMED_OBJECT


69

%VT_STORED_OBJECT


70

%VT_BLOB_OBJECT


71

%VT_CF


72

%VT_CLSID

Class ID

&H1000

%VT_VECTOR


&H2000

%VT_ARRAY

Array

&H4000

%VT_BYREF


 

Internally, a VARIANT is always 16-bytes in size, and may be passed as either a BYVAL or a BYREF parameter to functions.