Differences and contact between COM and DCOM
In fact, this kind of legislation is not scientific.
DCOM itself is a expression of COM
But because everyone heard COM usually regards it as a COM executed locally.
And DCOM is of course distributed COM
Execute on another computer on the network. So the difference between this COM and DCOM is born.
the difference:
COM has two forms of presence
Dynamic connection library and executable
But DCOM must be an executable program. Because DCOM is not possible to run in the customer program
So can't be a dynamic connection library.
COM (Dynamic Connection Form) You can communicate with RPC
And DCOM must use RPC remote calls.
COM (Dynamic Connection Library Form) Cooperate with customers in the same memory space
Call speed fast
The speed of DCOM is only one tenth of COM.
COM (dynamic connection library form) is not high
Customer program can cause service COM errors
DCOM security
The reason is also caused by COM and customer programs sharing memory space.
COM program configuration is simple
DCOM is more complicated. After all, DCOM involves network and security.
contact:
Customer programs don't have to know the existence form of COM
Uniform interface call mode
Customer programs don't even know where COM objects
May be on the same computer
You can also in the other side of the earth;
Since DCOM itself is a form of COM
Has a lot of common.
