[Scummvm-tracker] [ScummVM] #10778: QFG4 floppy: Crashes on the first fortune teller visit

[Vhati]

#10778: QFG4 floppy: Crashes on the first fortune teller visit
--------------------------------+-------------------------
  Reporter:  Vhati              |      Owner:  (none)
      Type:  defect             |     Status:  new
  Priority:  high               |  Component:  Engine: SCI
Resolution:                     |   Keywords:  SCI32
      Game:  Quest for Glory 4  |
--------------------------------+-------------------------

Comment (by Vhati):

 OFF-TOPIC

 @digitall:
 I'm not at a place where the specs can help me yet.

 I did find this article '''particularly''' helpful, demonstrating
 backtrace (bt) and breakpoints (bp_method) in SCI (Island of Dr. Brain).
 Wish there were more like that!
 https://moral.net.au/writing/2017/09/23/sierra_bug/

 Plus the subtle hint that "view_object 0013:1aa9" can be written as
 "view_object hero". And further, that one can drill down into attributes
 with "view_object hero plane", etc.
 \\
 \\
 The ''send'' command sounds like it could open up cheaty fun, invoking
 stuff on the fly, if I had a clue how to wield it... *clickety-click*

 {{{
 visible_plane_list
 # Hm.
 visible_plane_items statusPlane
 # Hmm.

 send statMana hide
 go
 # Looks at the absent mana bar.
 send statMana show
 go
 # Heh heh.
 }}}
 {{{
 # Experiments with listing inventory icons that way and calling their
 loseItem.
 # No get(). Those NumInvItem View objects must be downstream of the real
 # inventory management.
 # Hrm. "send hero get theOil" crashes.
 }}}
 {{{
 # Peeks at the cave arch script for properly getting the Dark One Sign
 item.
 view_object hero
 send hero drop 25
 go
 # Checks inventory.
 send hero get 25
 go
 # It's back.
 # 1, 2, 3...
 send hero get 15
 # Struck oil!

 send hero has 15
 # Message completed. Value returned 0000:0002.
 send hero get 15
 send hero has 15
 # Message completed. Value returned 0000:0003.
 }}}

 *evil grin*
 \\
 \\
 Aw. Looking at script 28 where the hero class is defined... takeDamage
 method might be using negative args to heal. Debugger can't pass 'em
 because its parser chokes on the minus sign.

 Maybe I'll post questions on the forum sometime: pagination/redirection
 for long text, setting attribute values on objects, passing negative args,
 etc.

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Ticket URL: <https://bugs.scummvm.org/ticket/10778#comment:5>
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