问题
I implemented an out-of-proc COM server (implemented in a Service). I don't want other applications to access all the functionality in the COM server, so I developed an in-proc server (DLL) which would talk to the out-of-proc server.
Because I don't want the interfaces in the out-of-proc COM server to be accessed directly, I don't embed the type library with the Service so I thought I could use #import and have access to the COM server through the TLB. However, when I try in my in-proc-server to create an instance of a class implemented in the service, I get an E_NOINTERFACE back. I guess this is due to marshalling, but I couldn't figure out how to overcome this.
Any idea on how to communicate from the in-proc-server with my out-of-proc server without exposing the interface details of the out-of-proc server?
回答1:
I'm not sure about how this will help to conseal the interfaces, but there're three ways to make marshalling working and typelib is one of them. The other quite easy way is a proxy/stub - a bunch of code in a separate in-proc COM server that will automagically do the marshalling once it has been registered in Windows registry. Again, I'm not sure how this will help conseal the interface, but it looks more covert then a type library that just exposes teh interface to anyone with OLEView.
来源：https://stackoverflow.com/questions/4308656/exporting-a-subset-of-a-out-of-proc-com-server-by-using-an-in-proc-server