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So, is it true that we can't expose a subset of interfaces of the inner object? -S.Kannan

When we aggregate an object is it possible to expose only certain interfaces(as opposed to all interfaces) of the inner component? Consider this scenario: The inner component has interfaces I1 and I2. The outer component wants to expose only I1(in addition to its own interfaces). But once I...

To be more specific, the DEF file should contain an entry for the exported function

I tried the following code and it worked. All I did is to add a DEF file to the dll project. *************************************************************** // DLL part void __declspec(dllexport)__stdcall doIt() { AfxMessageBox("doIt"); }...

When you call the the function you should call it like this: (*doIt)(); because doIt is a pointer to a function. -S.Kannan

If we passed only the pointer we can't change the value of thepointer(we can only change the contents pointed to by the pointer). So we pass the address of the (interface) pointer. so we need another level of indirection. CoCreateInstance() takes a void** parameter. So we need to type cast the...

Exactly. But if you are totally new to COM, only the first two chapters of that book will be of help to you. -S.Kannan

You can refer Chapter Two: IUnknown and IClassFactory in "Inside Distributed COM" by Guy Eddon and Henry Eddon Microsoft Press. There is a complete listing for a simple self-registering COM Component there. -S.Kannan

There are a few situations where it is necessary to use new. For e.g., suppose we create a linked list with the following node structure. struct node{ int data; node* next; }; If you are create the linked list in one function(where you will assign value to next) and use the linked...