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From: bcw@rti.rti.org (Bruce Wright)
Newsgroups: comp.windows.ms
Subject: Re: Space for pens, brushes, and other objects
Summary: Objects &c
Message-ID: <4101@rtifs1.UUCP>
Date: 26 Sep 90 04:29:21 GMT
References: <4941@hsv3.UUCP> <4942@hsv3.UUCP>
Organization: Research Triangle Institute, RTP, NC
Lines: 37

In article <4942@hsv3.UUCP>, jls@hsv3.UUCP (James Seidman) writes:
> 
> Where in memory are objects stored?  I'd most like to know if they're
> handled in such a way that they are automatically disposed when an application
> terminates, or if they always need to be explicitly removed with
> DeleteObject().

I haven't tried this on Windows 3, but under Windows 2 objects are
definitely NOT disposed of when the application terminates.  I was
writing an application once that created LOTS of pens and brushes,
but there was a minor bug in the algorithm that ran around and
deleted the old ones after it was through with them.  After a while 
things got VERY strange ... all sorts of odd things would start to 
happen (not just in that program, and even after the program had exited).

I'd be sort of surprised if Windows 3 added this sort of resource
management - it's going to take significant space on the smaller
machines, and Win3 just doesn't take up all that much more space
in memory (some of the mini-apps distributed with it are a different
story, but they're not the basic system itself).  But I haven't
really been interested in putting this to the test.

> On a similar note, do you have to use DeleteObject() to remove an object
> obtained with GetStockObject()?  (In fact, is it even considered valid
> to do so?)

It is not valid to do a DeleteObject on objects you obtain with
GetStockObject.  Also, be sure that any objects you delete aren't
selected into the current Device Context (or they won't be deleted).

Windows doesn't do much resource management for programs - you need
to explicitly delete anything you create (device contexts, pens,
brushes, timers, etc), though of course they are created and deleted
in different ways.  But not keeping track of them properly is one
of the easiest ways to wedge the system -

						Bruce C. Wright