IVarInvokeable

[Properties (by Name)][Methods (by Name)][Events (by Name)]

Interface needed for custom variants that need to implement dynamic properties and methods

Declaration

Source position: variants.pp line 214

Type
  IVarInvokeable = interface ['{1CB65C52-BBCB-41A6-9E58-7FB916BEEB2D}']
    function DoFunction(var Dest: tvardata; const V: tvardata; 
                       const Name: string; const Arguments: TVarDataArray)
                        : Boolean;
    function DoProcedure(const V: tvardata; const Name: string; 
                        const Arguments: TVarDataArray) : Boolean;
    function GetProperty(var Dest: tvardata; const V: tvardata; 
                        const Name: string) : Boolean;
    function SetProperty(var V: tvardata; const Name: string; 
                        const Value: tvardata) : Boolean;
  end
  ;

Description

IVarInvokeable must be implemented by the TCustomVariantType descendent if the custom variant needs to implement dynamic properties and methods.

IVarInvokeable has four functions that must be implemented. Any of these functions can be called whenever a custom variant's method is invoked or a property of the variant is read or written using DispInvoke.

The TCustomVariantType descendent TInvokeableVariantType implements the needed DispInvoke to call the IVarInvokeable interface, so you can descend from that type instead when creating a new custom variant type and override the needed functions.

Members

Member	Type	Visibility	Description
DoFunction	Method	default	Called for methods that return a result (functions)
DoProcedure	Method	default	Called for methods that do not return a result (procedures)
GetProperty	Method	default	Called when a property must be read
SetProperty	Method	default	Called when a property must be set

Inheritance

Class	Description
IVarInvokeable	Interface needed for custom variants that need to implement dynamic properties and methods

See also

Name	Description
TCustomVariantType	Base class for a custom variant type
TInvokeableVariantType	TCustomVariantType descendent that implements DispInvoke