Question

Have some .net assembly, calling it in delphi through COM.

var
   intf: ITest;

...
   intf:= CreateComObject(CLASS_TEST) as ITest;
   ...
   //here comes some stuff
   ...

Must i do something to destruct it to free memory. Or not?

Answer 1

You should better release the memory with

       intf := nil;

When you don’t need it any more. Better with a try...finally intf := nil; block, or in the Destroy overriden method if intf is defined as fIntf, i.e. as a class property.

If intf is defined on stack, it will we freed automatically at the end of the method. There is an hidden try...finally intf := nil; end block generated by the compiler to free the intf instance.