Com, DCOM, COM+

Hallo all

I know this is not a direct question for a problem, but does anyone know how to use them, how to create them? Any information will be appreciated!

Thanx

[Joacim Andersson]

You can create five types of COM objects in VB.[*]ÀctiveX DLL[*]ActiveX EXE[*]ActiveX Control[*]ActiveX Document DLL[*]ActiveX Document EXE

You're actually using COM components when you put a control on a form, or when you create an object with CreateObject or the New keyword.
COM (=Component Object Model) is simply a model for how different types of objects communicate.
DCOM (=Distributed COM) is how objects communicate over a network.

[André]

DCOM components are exe components only.

COM+ is the next generation of MTS, (that is microsoft transaction server)

COM+ is a better name since MTS does so much for you than just act as a transaction server.

With COM+ you can amongst other things:

Configure components to be transactional or Queued.
Get connection pooling, for database ressource sharing.
Security at interface level.
Object pooling.
etc...

If you come from a Java world then you must have heard of EJB's, enterprise java beans, this specification is a copy of MTS 2.0, so you know.


André