I've run into a particularly strange error. I've got this thing acting as a webserver, and if I go into firefox and hold down the key for refresh for 30 seconds or so, it'll crash the webserver-like-program ("D_SpaceSim.exe has encountered a problem and needs to close. blah blah" in a dialog box.) Nothing about that was printed in the console window for the program, etc.

So I hit debug and it VCPP6SE says "Unhandled exception in D_SpaceSim.exe: 0xC00000005: Access Violation." and then shows me this block of code:
------------------------------------------------------------
foreach (int i, SolarSystem ss; systems) {
	if (ss!==null) {
		if (ss.planets!==null) {
			if (ss.sun!==null) {
				s.writeString(`<li>`
				~EncodeURL(
					`System: planets(`~
-->					.toString(ss.planets.length)
					~`) coords(`~
					.toString(ss.x)
					~`,`~
					.toString(ss.y)
					~`) (Sun: `~
					.toString(SunStagesStr[ss.sun.stage])
					~` (Mass: `~
					.toString(ss.sun.mass)
					~`))`
				
					,Pages.Galaxy,ss.uid)
				~`</li>`);
			} else {
				Report("ss.sun is null!");
			}
		} else {
			Report("ss.planets is null!");
		}
	} else {
		Report("ss is null!");
	}
}
------------------------------------------------------------
The --> in there is where VCPP6SE had its little yellow arrow which marks the line that is currently being executed.

Right now, I can't think think of any reason why this should be crashing, and I'm starting to miss the "Access Violation" errors I got before. :P

Also, at the beginning of this function is 'synchronized(galaxy) {'
so that it can't get messed up if something else is using galaxy (The main loop in the other thread also does synchronized(galaxy) before doing every cycle, and does msleep(30) outside the synchronized block.

Also, I changed the code a little while ago so that it only listens to one client thread at a time (as opposed to being able to listen to several), so there are really only two threads, one for the web-server and one for the rest of the program (which does stuff with planets, etc).

The crashes are always at that same point in the code, and they don't seem to happen during normal use of the program - only when I hold down the refresh key for a good amount of time.

Now... One last thing. Since I couldn't find this problem, I added a try/catch(Error)/finally in doRead, around the code which calls handleRequest, which can call various other functions, including displayGalaxyPage, which is the function the code I quoted above is in.

-----------
protected synchronized void doRead(StreamSocket s) {
	try {
		blah blah blah
	} catch (WriteError) {
	} catch (Error) {
	} finally {
		try {
			s.disconnect();
		} catch (Error) {
		}
	}
}
-----------

But it doesn't seem to catch the exception/error/crashy-thing.

-SL

"SL" <shadowlord13@users.sourceforge.net> wrote in message news:c422jd$92j$1@digitaldaemon.com...
> Now... One last thing. Since I couldn't find this problem, I added a try/catch(Error)/finally in doRead, around the code which calls handleRequest, which can call various other functions, including displayGalaxyPage, which is the function the code I quoted above is in.
>
> -----------
> protected synchronized void doRead(StreamSocket s) {
> try {
> blah blah blah
> } catch (WriteError) {
> } catch (Error) {
> } finally {
> try {
> s.disconnect();
> } catch (Error) {
> }
> }
> }
> -----------
>
> But it doesn't seem to catch the exception/error/crashy-thing.

catch (Object) should catch it.