Hi all,
I'm getting a crash report from one user who has experienced the
following crash more than once. No other user is reporting this so
far. The crash is down in the text editing engine and I'm not sure
what I should be looking at in my usage of this code that could be
causing it. Suggestions welcome.
My first instinct is that the text view has been released and that I'm
messaging a stale pointer, but if that's the case I can't see how the
code could have made it as far as it has. Besides, the text view is
retained by another object for as long as it lives - it's only
released in -dealloc. I've checked that there are no other releases or
autoreleases on it.
0 libobjc.A.dylib 0x9561991b objc_msgSend + 27
1 libobjc.A.dylib 0x956213b2 prepareForMethodLookup +
85
2 libobjc.A.dylib 0x95622657 lookUpMethod + 86
3 libobjc.A.dylib 0x95619da7
_class_lookupMethodAndLoadCache + 40
4 libobjc.A.dylib 0x95619953 objc_msgSend + 83
5 com.apple.AppKit 0x94b6f2e1 -[NSTextView(NSSharing)
setSelectedRange:] + 64
6 com.apple.AppKit 0x94b6bd62 -[NSLayoutManager
textStorage:edited:range:changeInLength:invalidatedRange:] + 445
7 com.apple.AppKit 0x94b38100 -[NSTextStorage
_notifyEdited:range:changeInLength:invalidatedRange:] + 132
8 com.apple.AppKit 0x94b37921 -[NSTextStorage
processEditing] + 218
9 com.apple.AppKit 0x94b3781e -[NSTextStorage
edited:range:changeInLength:] + 272
10 com.apple.Foundation 0x95d8063c -
[NSConcreteMutableAttributedString
replaceCharactersInRange:withAttributedString:] + 413
11 com.apple.AppKit 0x94bd14c7 -[NSConcreteTextStorage
replaceCharactersInRange:withAttributedString:] + 102
0 libobjc.A.dylib 0x9561992c objc_msgSend + 44
1 com.apple.AppKit 0x94b6f2e1 -[NSTextView(NSSharing)
setSelectedRange:] + 64
2 com.apple.AppKit 0x94b6bd62 -[NSLayoutManager
textStorage:edited:range:changeInLength:invalidatedRange:] + 445
3 com.apple.AppKit 0x94b38100 -[NSTextStorage
_notifyEdited:range:changeInLength:invalidatedRange:] + 132
4 com.apple.AppKit 0x94b37921 -[NSTextStorage
processEditing] + 218
5 com.apple.AppKit 0x94b3781e -[NSTextStorage
edited:range:changeInLength:] + 272
6 com.apple.Foundation 0x95d8063c -
[NSConcreteMutableAttributedString
replaceCharactersInRange:withAttributedString:] + 413
7 com.apple.AppKit 0x94bd14c7 -[NSConcreteTextStorage
replaceCharactersInRange:withAttributedString:] + 102
The code here looks like this:
- (NSTextView*) editText:(NSTextStorage*) text inRect:(NSRect) rect
delegate:(id) del drawsBackground:(BOOL) drawBkGnd
{
NSAssert( text != nil, @"text was nil when trying to start a text
editing operation");
NSAssert( rect.size.width > 0, @"editing rect has 0 or -ve width");
NSAssert( rect.size.height > 0, @"editing rect has 0 or -ve height");
if ([self isTextBeingEdited])
[self endTextEditing];
// editor's frame is expanded by five points to ensure all characters
are visible when not using screen fonts
// container text inset is later set to compensate for this.
NSRect editorFrame = NSInsetRect( rect, -5, -5 );
if( m_textEditViewRef == nil )
m_textEditViewRef = [[[[self class] classForTextEditor] alloc]
initWithFrame:editorFrame];
else
[m_textEditViewRef setFrame:editorFrame];
[m_textEditViewRef setAllowsUndo:NO];
NSRange textRange = NSMakeRange( 0, [[m_textEditViewRef textStorage]
length]);
[[m_textEditViewRef textStorage] replaceCharactersInRange:textRange
withAttributedString:text];
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