Using Caché Objects - InterSystems Documentation

Using Objects with Caché ObjectScript
Do rc.PurgeAll()
where rc is the OREF of a ReportCard object.
Similarly, you can execute the Exists class method of the %File class using the following
code:
Set exists = file.Exists("\temp\file.txt")
where exists is the return value and file is the OREF of any %File object.
10.1.5 Error Conditions
When invoking a class or instance method, a runtime error can occur under the following
conditions:
• If you attempt to invoke a private method from outside of the object (that is, not from
one of its other methods).
• If you invoke a method that is not defined for a class or an object instance.
• If you attempt to invoke a method for a class does not exist.
10.2 Creating New Objects
The general syntax for creating new object instances is to use the class method %New:
Set oref = ##class(Classname).%New()
where oref is the OREF of the new object and Classname is the name of the class to create.
Classname is case sensitive and may contain a package name.
For example, to create a new Person object, use the following code:
Set person = ##class(MyApp.Person).%New()
where person is the OREF of the new Person object.
You can pass an optional argument to the %New method. If present, this argument is passed
to the object's %OnNew method. The use of this argument depends on the implementation
of the specific class you are using.
70 Using Caché Objects