_Narrow

Description

Converts a CORBA object reference from a general supertype to a more specific subtype.

This function is used by PowerBuilder clients connecting to EAServer.

Applies to

CORBAObject objects

Syntax

corbaobject._Narrow ( newremoteobject, classname )

Argument	Description
corbaobject	An object of type CORBAObject that you want to convert
newremoteobject	A variable that will contain the converted object reference
classname	The class name of the subtype to which you want to narrow the object reference

Returns

Long. Returns 0 if it succeeds and a negative number if an error occurs.

Usage

The _Narrow function allows you to narrow proxy objects in a CORBA-compatible client that connects to EAServer. For additional examples, see the functions on the See also list.

Examples

Example 1

The following example narrows a CORBA object reference to the n_Bank_Account interface:

CORBAObject my_corbaobj

n_Bank_Account my_account

...

...

my_corbaobj._narrow(my_account,"Bank/n_Bank_Account")

my_account.withdraw(100.0)

Example 2

In this example, the component is an EJB component that resides in a separate domain in EAServer. In this case, the SimpleBean component’s classes are in the ../classes/adomain/asimplepackage subdirectory:

CORBAObject my_corbaobj

SimpleBean my_simplebean

SimpleBeanHome my_simplebeanhome

...

my_corbaobj._narrow(my_simplebeanhome, 
  "adomain/asimplepackage/SimpleBeanHome")