How can i implement list of objects in COM

[jack]

In MFC programming, i use link list to implement dynamic allocated objects.


However in COM, how can i implement that ?? for example, if i'm writing an

application for handling employee's details.


Should i write a COM for holding things about an employee and expose interface

for handling the details ??


How do i implement a collection objects of employees ?? Should i call

CoCreateInstance multiple times for employees, and store interface pointers

for every employee ??

[Eddie]

There is an standard interface ( I can´t remember now its name ) wich implements generic collections in COM. If it doesn´t match what you need, you can always make a simple interface wich provides iteration throught a list of interface pointers. I think it´s the standard way for managing collections in COM.

[Julius Ivanyi]

Hi

I would try to write a COM for employee list, with an [out] interface for a long

that would give you the number of employees and a [out] pointer to an employee

array, the number of items of which are defined in the long variable. The server

could look up the list, create the array and send back to the client.

HTH

Julius

[Dimarzio]

Build a simple COM component that internally uses std::vector or something, give the components interface members like Next, Back, GetAt, etc.. that act on that internal vector member. You could use ATL's CSimpleMap or CSimpleArray in place of vector. Any list type container would work. You then pass the interface to the client and it can iterate across the array via the "wrapper" members.

[jack]

How about if I want to implement "invoice" ??? there should be many things in an

invoice, and functions to deal with calculation. Should i implement each invoice

as a conventional class object, and wrapped the collection with COM ?? or each

invoice is a COM ??

[Dave Lorde]

When you are creating multiple instances, it is more efficient to obtain a pointer to the class object's IClassFactory interface and use the CoGetClassObject function.


Dave