Kofax DM API Instrukcja Użytkownika Pobierz pdf (Strona 51)

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AN OVERVIEW OF THE DM API 31

Early and Late Binding

PCDSQL

PCDTrusteeList

Early and Late Binding

You can create objects in the DM API using either early binding or late

binding. Examples shown in this document will sometimes use early

binding, and other times will use late binding. In custom applications

you implement, you can usually use either, but there are a few instances

where the text will indicate that one should be used in preference to the

other.

Early Binding With early binding you create an object in a single step when you first

dimension it. This may be the most appropriate way to create an object

if you are going to use it immediately.

Early binding uses the New keyword within the Dim statement when

the object is first dimensioned. For example:

Dim pDoc As New PCDClient.PCDPutDoc

The New operator must be used on Visual Basic objects that have

Private or PublicNotCreatable instancing properties.

Late Binding With late binding you first dimension the item you want to create, often

dimensioning it as a generic object. Later, when you are ready to use the

object, you use the

Set statement to instantiate the object in memory.

For example:

Dim pObj As Object

...

Set pObj = CreateObject(“PCDClient.PCDLookup”)

If your application uses the Microsoft Transaction Server, you must

create objects using late binding with the

CreateObject method. The

Transaction Server cannot see instances of externally created objects

that you generate with the

New operator.

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