Hello,

Just to be sure, when using an interface from COM, can I just ignore it and the compiler will release it when it's scope ends, or do I need to manually set the variable to nil?

var
  d3d: IDirect3D9 = nil; // Direct3D interface
begin
  // create the Direct3D interface
  d3d := Direct3DCreate9(D3D_SDK_VERSION);

  // ... use the interface here

  d3d := nil; // necessary or not?
end;

thanks,

When it goes out of scope it gets freed. But I do vaguely remember something in the lines of you are not guaranteed when it gets freed. But with my testing it gets freed pretty quickly.

I use interfaces for logging (entering & exiting procedures) and for reseting the mouse cursor when a method exits.

Regards,
- Graeme -

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var   d3d: IDirect3D9 = nil; // Direct3D interface

no need in this.
any interface type variable is always initialized with 'nil' value.