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Determine Data Types by Charles
Carroll
VBScript, unlike many languages, does not require or allow
you to specify data types. It is possible to examine a variables data type.
The TYPENAME function allows you to determine what type of
data a variable is and the types supported includes: Boolean, Byte, Currency, Date,
Decimal, Double, Empty, Error, Integer, Long, Nothing, Null, Object*, Single, String and
Unknown.
* TYPENAME also returns specific object types like recordset,
command, etc. It only returns Object when confronted with a generic object.
VARTYPE returns a number corresponding to the type of value
stored in a variable.
The VarType function returns the following values:
| Constant |
Value |
Description |
| vbEmpty |
0 |
Empty (uninitialized) |
| vbNull |
1 |
Null (no valid data) |
| vbInteger |
2 |
Integer |
| vbLong |
3 |
Long integer |
| vbSingle |
4 |
Single-precision floating-point number |
| vbDouble |
5 |
Double-precision floating-point number |
| vbCurrency |
6 |
Currency |
| vbDate |
7 |
Date |
| vbString |
8 |
String |
| vbObject |
9 |
Automation object |
| vbError |
10 |
Error |
| vbBoolean |
11 |
Boolean |
| vbVariant |
12 |
Variant (used only with arrays of Variants) |
| vbDataObject |
13 |
A data-access object |
| vbByte |
17 |
Byte |
| vbArray |
8192 |
Array |
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