Howard Hansen,
I believe what galatyphoon was referring to is COM must support 'IUnknown'
capability if it is going to be a "COM" component. within IUnknown the
function "QueryInterface()" can be called to determine what interface(s) the
COM component supports and can obtain a pointer to the interface.
Unfortunately, I have not reviewed the files to be able to answer the
question at this time.
steve tharp
Howard Hansen <[EMAIL PROTECTED]> wrote:
galatyphoon wrote:
>
> Hi;
>
> I've checked all sample codes in Developer's Kit and "DjTrader's Un-
> Official Developer's Document" but i've found nothing about the Query
> class in the COM library. Looking at the members of this class, i guess
> that this class lets developers to query QP3 databases. But since i've
> no idea about the internal structure about the databases (table names,
> column names etc.) i couldn't make it work so far.
>
> And a second question, how can i list the components of a certain index
> (let's say SP500) with QP3 COM library? Symbols class list symbols only
> according to exchange memberships or types (futures, stocks etc.)?
>
What do you mean by the Query class? I have occasionally used COM to
access the Quotes Plus database and I don't remember seeing a class
called Query. There are no Quote Plus COM methods for listing the
components of the SP 500 index.
Howard
>
>
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