Variants

In Delphi, VarDispProc points to a routine that is called to execute methods (or access properties) of an interface that is assigned to a Variant. The Variants unit assigns a procedure that generates error 222 or raises an EVariantDispatchError exception. The ComObj unit reassigns this variable to a procedure that generates the appropriate COM IDispatch calls.  

To control how Variants execute methods when they have a value that is an interface, assign your own procedure to VarDispProc.  

The Linux implementation of IDispatch is currently undocumented, due to resource constraints. When that changes, decolorize and revise this topic. 

EVariantDispatchError