You can use the numbers listed or you can use also the VBScript
internally defined constants (if your application is in VBScript) or
use the constants defined in the ASP
include files supplied with ActiveX Pack1. We suggest using named
constants in larger applications as it will make them more readable.
| Value |
VBS constant |
Include file constant |
Type |
Supported by SFRecord, SFField,
SFFilter |
Comments |
| 0 |
vbEmpty |
cvtEmpty |
Empty value |
no* |
Used to indicate empty
variables/values |
| 1 |
vbNull |
|
NULL value |
no |
May be returned as indicator
for NULL (invalid pointer). |
| 2 |
vbInteger |
cvtInteger |
2 byte signed integer |
yes |
|
| 3 |
vbLong |
cvtLong |
4 byte signed integer |
yes |
|
| 4 |
vbSingle |
cvtFloat |
4 byte floating point |
yes |
|
| 5 |
vbDouble |
cvtDouble |
8 byte floating point |
yes |
|
| 6 |
vbCurrency |
cvtCurrency |
Currency (8 byte integer) |
yes |
Currency is in fact 64 bit
signed integer treated as fixed point value (2 digits after the
dot) |
| 7 |
vbDate |
cvtDate |
OLE Date (8 byte) |
yes |
OLE date is recorded in 8 byte
floating point numbers physically. |
| 8 |
vbString |
cvtString |
String 2 x n bytes + 2 |
yes |
Strings require size to be
specified when used as fields or read/written directly through
SFFilter. |
| 9 |
vbObject |
|
Object pointer |
no |
Indicates that an object
pointer is contained. By itself it caries no information what
kind of value can be extracted from the object. |
| 10 |
vbError |
|
Error value |
no |
Used to hold error values |
| 11 |
vbBoolean |
cvtBoolean |
2 byte Boolean |
yes |
Booleans can be used in
conditional expressions directly (in all the scripting
languages) |
| 12 |
vbVariant |
|
Variant (can be resolved further) |
no |
Used to indicate that a VARIANT
value contains another VARIANT value (a kind of recursion).
Therefore it does not indicate particular type and cannot be
used in fields/records. |
| 13 |
vbDataObject |
|
Data object |
no |
Special value indicating COM
data transfer object. |
| 14 |
vbDecimal |
|
Decimal sequence of bytes |
no |
Special type (not supported in
records as it has no fixed size defined) |
| 16 |
|
cvtSByte |
Signed byte |
yes |
Signed byte |
| 17 |
vbByte |
cvtByte |
Unsigned byte |
yes |
Unsigned byte (usually this
type represents the minimal piece of binary data) |
| 18 |
|
cvtUInteger |
Unsigned 2 byte integer |
yes |
|
| 19 |
|
cvtULong |
Unsigned 4 byte integer |
yes |
|
| 8192 |
vbArray |
|
Array flag (used in combination with others) |
no** |
Combined using a bit wise OR
operation with other types it designates an array of that type.
The arrays in the scripting languages (if they are supported
over the standard COM features - VBScript for example) are
arrays of variants by default. |
* - Supported as "non-set" meaning. Empty values cannot be
written/read.