[Rubycocoa-talk] copyWithZone

[Eloy D. <elo...@gm...>]

Hello,

I'm trying to write my own custom NSCell for a tableview.
However, the table view tries to call #copyWithZone on my objects,
which are subclasses of NSObject. So I was trying to create a working
#copyWithZone, but no matter what I do it always crashes immediately.
For instance I have the following, but it doesn't even write to the
console:

def copyWithZone(zone)
  puts 'COPY!'
  copy = Download.allocWithZone(zone).init
  self.instance_variables.each do |iv|
    copy.instance_variable_set iv, self.instance_variable_get(iv)
  end
  return copy
end

Backtrace:

#0  0x90a594c0 in objc_msgSend ()
#1  0xbfffc21c in ?? ()
#2  0x0002b850 in ocid_to_rbobj ()
#3  0x0002df10 in ocdata_to_rbobj ()
#4  0x0003051a in ovmix_register_ruby_method ()
#5  0x00031a98 in rbobj_call_ruby ()
#6  0x00031075 in ovmix_register_ruby_method ()
#7  0x0002f8b9 in init_ovmix ()
#8  0x927fa468 in -[NSObject(NSForwardInvocation) forward::] ()
#9  0x90a5ccc1 in _objc_msgForward ()
#10 0x932aed02 in -[NSCell _setContents:] ()
#11 0x932aec95 in -[NSCell setObjectValue:] ()
#12 0x9353abaa in -[_NSPlaceholderTextFieldPlugin showValue:inObject:] ()
#13 0x93511593 in -[NSValueBinder showValue:inObject:] ()
#14 0x93510938 in -[NSValueBinder
_adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState:]
()
#15 0x9353a287 in -[NSValueBinder
updateTableColumnDataCell:forDisplayAtIndex:] ()
#16 0x9353a9ef in -[NSTextValueBinder
updateTableColumnDataCell:forDisplayAtIndex:] ()
#17 0x9353a1d6 in -[_NSBindingAdaptor tableColumn:willDisplayCell:row:] ()
#18 0x93402a9d in -[NSTableView _sendDelegateWillDisplayCell:forColumn:row:] ()
#19 0x933ea065 in -[NSTableView _drawContentsAtRow:column:clipRect:] ()
#20 0x933e902b in -[NSTableView drawRow:clipRect:] ()
#21 0x933e67ce in -[NSTableView drawRowIndexes:clipRect:] ()
#22 0x933e56a4 in -[NSTableView drawRect:] ()
#23 0x933113b1 in -[NSView _drawRect:clip:] ()
#24 0x9331040b in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] ()
#25 0x9330f473 in -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
()
#26 0x93310041 in -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
()
#27 0x93310041 in -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
()
#28 0x93310041 in -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
()
#29 0x93310041 in -[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
()
#30 0x9330eb78 in -[NSThemeFrame
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
()
#31 0x9330e362 in -[NSView
_displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:]
()
#32 0x9330dc8e in -[NSView displayIfNeeded] ()
#33 0x9330da32 in -[NSWindow displayIfNeeded] ()
#34 0x9335dd6c in _handleWindowNeedsDisplay ()
#35 0x9082dd6e in __CFRunLoopDoObservers ()
#36 0x9082ce10 in CFRunLoopRunSpecific ()
#37 0x9082cace in CFRunLoopRunInMode ()
#38 0x92dec8d8 in RunCurrentEventLoopInMode ()
#39 0x92debfe2 in ReceiveNextEventCommon ()
#40 0x92debe39 in BlockUntilNextEventMatchingListInMode ()
#41 0x93292465 in _DPSNextEvent ()
#42 0x93292056 in -[NSApplication
nextEventMatchingMask:untilDate:inMode:dequeue:] ()
#43 0x9328bddb in -[NSApplication run] ()
#44 0x9327fd2f in NSApplicationMain ()
#45 0x0003fc0d in ffi_call_SYSV ()
#46 0x0003fbae in ffi_call ()
#47 0x0003cfa0 in rb_ffi_dispatch ()
#48 0x00035ca0 in find_bs_boxed_by_encoding ()
#49 0x00221e09 in call_cfunc ()
#50 0x002214f2 in rb_call0 ()
#51 0x00222489 in rb_call ()
#52 0x0021c34a in rb_eval ()
#53 0x00217d9c in eval_node ()
#54 0x00218369 in ruby_exec_internal ()
#55 0x002183b3 in ruby_exec ()
#56 0x002183dd in ruby_run ()
#57 0x00033474 in RBApplicationMain ()
#58 0x00002886 in main ()

So does somebody know of a good way of implementing this with RubyCocoa?

Cheers,
Eloy

PS: I'm on svn rev 1983