Jim:
The objects are effectively "lost", because only the latest remains
available. For instance, consider the following example:
hVV = Create_VV( REAL , 0); // hVV = 0x009fb17c (a pointer
// to an object in memory)
hVV = Create_VV( REAL , 0); // hVV = 0x009fb20e (another
pointer
// to another object in
memory)
hVV = Create_VV( REAL , 0); // hVV = 0x009fb241 (yet another
// pointer to another object
in memory)
Here, the first two objects still exist and are still being "maintained"
inside Oasis montaj, but they are lost to the user, because the hVV pointer
refers just to the third one.
Now the GX compiler works by creating a list of all the objects, and when a
GX exits it goes through to see which objects are still around, and calls
the Destroy functions automatically, but programmers should not rely on this
capability (although Microsoft, in its ".NET" is actually promoting this
under the term "garbage collecting").
Stephen
_______________
Geosoft Inc.
Stephen Cheesman
[EMAIL PROTECTED]
(905) 315-8207
Software and services for effective earth science decision-making.
Free Oasis montaj interface now available at http://www.geosoft.com
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: December 21, 2001 12:49 PM
To: [EMAIL PROTECTED]
Subject: [gxnet]: Trend2_VVU - autodestroy question
Hi Stephen,
hLine = FirstSelLine_DB(hDB);
while (iIsLineValid_DB(hDB,hLine))
{
..... (other code).
hVV = Create_VV( REAL , 0); // create object inside the loop
...... (other code)
// --- Advance to Next hLine ---
hLine = NextSelLine_DB( hDB , hLine );
}
> The problem is that the object is re-created over and over again for each
> new line. While the GX compiler is set up to keep track of each object as
it
> is made, and automatically destroys them afterward, hopefully preventing
> what is known as a "memory leak", this certainly stresses the system,
> especially if there are a lot of objects and a lot of lines.
Could you elaborate on this a little?
What actually happens in this case? Do all the hVV's point to the same
memory?
Seems to me I remember that it doesn't. Does the system keep track of
objects
in some way that is independent of the symbols that are attached to them?
Does automatic destruction of objects occure at any time other than GX
termination?
Thanks,
---
Jim Roy voice 541 757 7231
Sys. Admin. fax 541 757 7331
NW Geophysical Assoc. http://www.nga.com
Corvallis Or. US
---
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