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  • Retrieving the definition
  • Limits
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Stored procedures
Retrieves the definition of element type.
Example
PROCEDURE Proc(x)
// Retrieves the definition of x type
MyDefinition is Definition
MyDefinition = GetDefinition(x)
Syntax
<Result> = GetDefinition(<Element>)
<Result>: Definition
Definition variable.
<Element>: Variable or class member
Element for which the definition will be retrieved.
Remarks

Retrieving the definition

GetDefinition is used to retrieve the definition of content type (and not the definition of variable type).
Example:
If two classes "DerivedClasse" and "BaseClass" derive from each other. If the instances of "DerivedClass" and "BaseClass" are handled by a "dynamic BaseClass" variable, GetDefinition returns the definition of real class of instance.
po is dynamic BaseClass
d is Definition
 
po = new BaseClass
d = GetDefinition(po)
Trace(d.Name)
 
po = new DerivedClass
d = GetDefinition(po)
Trace(d.Name)
If the type of the element is not supported, GetDefinition returns a Null definition with a non-fatal error ("Invalid definition").
If the element is not allocated, GetDefinition returns a Null definition with a non-fatal error ("Element not allocated").
The error cases can be processed:
  • by comparing the description to Null.
  • by checking the value of the ErrorOccurred variable.
The following types of elements are supported:
  • native variables and members
  • advanced variables and members
  • variables and members of type class
  • variables and members of type structure
The following types of elements are not supported:
  • variables and members of .NET type
  • windows, reports, pages, controls, etc.
  • HFSQL files, queries, items, etc.

Limits

  • In a project, you cannot retrieve the definition of an instance coming from:
    • an external component.
    • an internal component.
  • In an external component, you cannot retrieve the definition of an instance coming from the host project.
Component: wd270vm.dll
Minimum version required
  • Version 16
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