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another bug : getItemAtSlot(30) | JoinUO Forums

another bug : getItemAtSlot(30)

The UO "Demo" is a slightly modified OSI UO Server and Client which was bundled on the Ultima Online Second Age retail CD. This forum seeks to reveal it's mysteries.

Site Admin
Posts: 372
Joined: Wed Apr 08, 2009 6:35 am
PostPosted: Sat Nov 24, 2012 7:36 pm
Today I found a new OSI bug in the demo.

I've documented the getItemAtSlot function at our wiki : . While documenting I realized there was something not right.

I've used Python (using uodmp ) to verify this bug. I do not believe the bug can be triggered through normal gameplay.

UO Demo getItemAtSlot.png
getItemAtSlot crash bug
UO Demo getItemAtSlot.png (28.38 KiB) Viewed 20262 times
<Derrick> RunUO AI is kind of a functional prototype, which i have hacked into something resembling OSI behavior, but only by complitcating everything

Site Admin
Posts: 65
Joined: Thu Sep 24, 2009 1:43 pm
Location: Was Russia,Moscow; Currently Germany,Berlin
PostPosted: Sat Nov 24, 2012 7:53 pm
Interesting that in my packet guide, layer 30 (0x1E) is listed as "Shop Max".
I'll try to dig where was the source of this information.

Maybe it functions different when applied to the vendor mobile instead of the player mobile, but they have forgot to check that object is not player when layer is 30?

Site Admin
Posts: 372
Joined: Wed Apr 08, 2009 6:35 am
PostPosted: Sun Nov 25, 2012 10:28 am
<Derrick> RunUO AI is kind of a functional prototype, which i have hacked into something resembling OSI behavior, but only by complitcating everything

Site Admin
Posts: 65
Joined: Thu Sep 24, 2009 1:43 pm
Location: Was Russia,Moscow; Currently Germany,Berlin
PostPosted: Sun Nov 25, 2012 10:54 am
Classic range check typo then.
Haven't found source of my information.
In all runuo versions I have, 0x1D (Bank) is the last valid one. (so it was not the source)

Site Admin
Posts: 372
Joined: Wed Apr 08, 2009 6:35 am
PostPosted: Sun Nov 25, 2012 11:25 am
Attachments
EQPOS_SHOP_MAX.png
EQPOS_SHOP_MAX
EQPOS_SHOP_MAX.png (10.94 KiB) Viewed 20249 times
<Derrick> RunUO AI is kind of a functional prototype, which i have hacked into something resembling OSI behavior, but only by complitcating everything

Site Admin
Posts: 65
Joined: Thu Sep 24, 2009 1:43 pm
Location: Was Russia,Moscow; Currently Germany,Berlin
PostPosted: Sun Nov 25, 2012 11:33 am
Just found it too =)

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