How to pass interface type/GUID reference to an automation method in Delphi
- by Alan Clark
In Delphi you can pass class references around to compare the types of objects, and to instantiate them. Can you do the same with interface references being passed to a COM automation server?
For example, you can define a method taking a GUID parameter using the type library editor:
function ChildNodesOfType(NodeType: TGUID): IMBNode; safecall;
In this function I would like to return automation types that support the interface specified by NodeType, e.g.
if Supports(SomeNode, NodeType) then
result := SomeNode;
But the Supports call always fails, I tried passing in the Guids defined in the type library but none of the different types (Ixxx, Class_xxxx, IId_Ixxxx) seem to work.
