When a command has output arguments but does not explicitly specify a return value, it actually returns a special collection called an ISIVTCollection which implements the following methods and properties:
Methods
Name
Parameters
Description
Add
key
Adds an item to the collection as a value associated with a key (String). For example:
vtcol.Add("Native", false);
value
Remove
key
Removes an item identified by key (String) from the collection. For example:
vtcol.Remove("Native");
supports __NewEnum
--
Provides support for standard collection enumeration. For example:
var eArg = new Enumerator(vtcol);
for ( ; !eArg.atEnd(); eArg.moveNext() ) {
var myArg = eArg.item();
Application.LogMessage( myArg == null );
}
Properties
Name
Parameters
Description
Item
key or index
Returns or sets the value for an item identified by key (String) or index (Long). Since this the default property for the
ISIVTCollection, you can omit the Item when accessing it. For example:
// explicitly calling the Item property
var oldVal = vtcol.Item("CurveKind");
vtcol.Item("CurveKind") = 15;
// omitting the Item when calling the property
var oldVal = vtcol(0);
vtcol(0) = true;
Count
--
Returns the total number of items in the collection. For example:
Application.LogMessage( vtcol.Count );
Value
key
Returns or sets the value for an item identified by key (String) only. For example:
var oldVal = vtcol.Value("CurveKind");
vtcol.Value("CurveKind") = 15;
Examples
The following examples demonstrate the use of the ISIVTCollection:
