ArcGIS Engine Developer Guide

INTERFACES AND MEMBERS
Set statement linking it to the existing Editor object.
Public Sub SetEvents()
Dim pID as New UID
pID = "esriEditor.Editor"
Set m_pEditor = Application.FindExtensionByCLSID(pID)
Set EditEvents = m_pEditor
Secondary outbound interfaces (nondefault)
IActiveViewEvents
IAttributeTransfer-
Type
IEditEvents
(EditEvents2)
IEditEvents2
(EditEvents3)
IEditEvents3
IEdit Layers
Editor class contains several outbound interfaces
Interface key
Property Get
Property Put
Property Get/Put
Property Put by Reference
Function
Event function
Editor
Properties and their symbols
When a class implements more than one outbound event, the secondary interface
name is preceded by a classname, (EditEvents2)IEditEvents2 for example, where
the classname indicates the name of a Helper class. The Helper class is an artificial
coclass that solves the Visual Basic problem with multiple outbound interfaces
on an object. When working with a nondefault outbound interface for
EditEvents2 in Visual Basic 6, declare the variable as follows:
Private WithEvents pEditEvents2 as EditEvents2
INTERFACE MEMBERS
The members of an interface include its properties, which specify the state of an
object, and its methods, which perform some action.
Properties are designated as read-only (get), write-only (put), or read–write (get/
put). Additionally, the value of a property may be a simple data type, a long for
the x-value of a point object, or another class, such as a coordinate system class
(GeographicCoordinateSystem, for example) for the SpatialReference property.
Each property on the diagram is listed with the data type required or returned.
The symbolization and syntax of properties that can be set with an object will
vary based on whether the property is put by value (put) or put by reference. If
ObjectG is assigned to a property by value on ObjectM, then ObjectG is contained
within ObjectM. When an object is passed by reference, an association is
formed between the two objects. This is advantageous because an object can be
reused in many associations, using less memory space.
Dim psphere As ISphere
Set psphere = New Sphere
Dim ppoint As IPoint
Set ppoint = New point
psphere.Center = ppoint
Dim pspatref As ISpatialReference
Set pspatref = New GeographicCoordinateSystem
'This won't compile
'psphere.SpatialReference = pspatref
Set psphere.SpatialReference = pspatref
448 • ArcGIS Engine Developer Guide