All Cadcorp SIS API Methods

Evaluate Method

Description

Evaluates an expression.

Syntax

Public Function Evaluate( _
   ByVal objectType As Integer, _
   ByVal nObject As Long, _
   ByVal formula As String _
) As Variant

Parameters

objectType

 

SIS_OT_COMMAND	Changes the properties/mode of the current command.
SIS_OT_CURITEM	The current open Item.
SIS_OT_DEFITEM	The default Item.
SIS_OT_DATASET	Datasets.
SIS_OT_OVERLAY	Overlays.
SIS_OT_WINDOW	The window.
SIS_OT_NOL	Named Object Libraries.
SIS_OT_FTABLE	The current Feature Table.
SIS_OT_SCHEMA	The current Schema.
SIS_OT_SCHEMACOLUMN	A column in the current Schema.
SIS_OT_THEME	The current Theme.
SIS_OT_THEMECOMPONENT	A component in the current Theme.
SIS_OT_PRINTER	Printer.
SIS_OT_SYSTEM	System variables.
SIS_OT_OPTION	System wide Boolean options.

 

nObject

The index of the object type.

 

formula

The expression to evaluate. See Property Expression Syntax for details.

Return Type

The evaluated value of the given expression.

Remarks

The following expression function enables you to find out what data type an attribute is.

VarType(...)

which returns an enumeration, e.g. VarType(‘my_date@’) returns 7. Use it as part of Sis.Evaluate (for @ datatypes) and Sis.EvaluateInt (for $&# datatypes).

The following expression translates these numbers into descriptive types:

Choose(VarType('attr@'),'Null','Short','Long (&)','Float','Double(#)','Currency','Date','String($)','','','Boolean','','','Decimal','Byte'.'Unsigned Byte','Unsigned Short','Unsigned Long','Long Long Integer','Unsigned Long Long')

Substitute attr@ for your attribute name (including the $&#@ suffix).

VarType({...}) will also work with any lambda expression inside the {}.

For example:

VarType({DATE@})

The returned value will determine the data type for the queried column:

Available: GEO D OD OM OV SISpy

Group:

• Property Methods

Example

sis.Evaluate ( SIS_OT_CURITEM , 0, "Area@" )