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POtextView:shouldChangeTextInRanges:replacementStrings: method crashes when NSTextStorage is edited
 

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  1. POtextView:shouldChangeTextInRanges:replacementStrings: method crashes when NSTextStorage is edited
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    <p>I'm new to Cocoa programming under OSX Lion, so this is a question I cannot find answer to. I need to modify an attributed string which is entered by the user through the <code>NSTextView</code>. Editing may include replacement of some portion(s) of the string inside the <code>NSTextStorage</code> and addition of <code>NSTextAttachment</code> objects. I implemented the protocol and provided it for <code>NSTextView</code> instance as delegate. I also implemented the method <code>textView:shouldChangeTextInRanges:replacementStrings:</code> in the next manner:</p> <pre><code>- (BOOL)textView:(NSTextView *)textView shouldChangeTextInRanges:(NSArray *)affectedRanges replacementStrings:(NSArray *)replacementStrings{ NSTextStorage* ts=[textView textStorage]; [ts beginEditing]; NSMutableString* buf=[ts mutableString]; //make some completions NSRange rng; rng.location=0; rng.length=[buf length]; [buf replaceOccurrencesOfString:@"(." withString:@"(0." options:0 range:rng]; rng.location=0; rng.length=[buf length]; [buf replaceOccurrencesOfString:@"-+" withString:@"-" options:0 range:rng]; rng.location=0; rng.length=[buf length]; [buf replaceOccurrencesOfString:@"+-" withString:@"-" options:0 range:rng]; [ts endEditing]; return YES; } </code></pre> <p>Thus I try the next scenario: when the application is up, the user types inside the <code>NSTextView</code> some text. If he types "(." everything is going well. But when he types "-+ " (minus, plus, whitespace) - the method crashes producing this dump:</p> <pre><code>[NSConcreteTextStorage attributesAtIndex:effectiveRange:]: Range or index out of bounds ( 0 CoreFoundation 0x00007fff95963286 __exceptionPreprocess + 198 1 libobjc.A.dylib 0x00007fff8c32bd5e objc_exception_throw + 43 2 CoreFoundation 0x00007fff959630ba +[NSException raise:format:arguments:] + 106 3 CoreFoundation 0x00007fff95963044 +[NSException raise:format:] + 116 4 AppKit 0x00007fff90acb5bd -[NSConcreteTextStorage attributesAtIndex:effectiveRange:] + 121 5 AppKit 0x00007fff90f4cde6 -[NSTextView insertText:replacementRange:] + 840 6 AppKit 0x00007fff910fc891 -[NSTextInputContext handleTSMEvent:] + 2289 7 AppKit 0x00007fff910fe4fe _NSTSMEventHandler + 165 8 HIToolbox 0x00007fff89745308 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1263 9 HIToolbox 0x00007fff89744914 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 446 10 HIToolbox 0x00007fff8975b6c7 SendEventToEventTarget + 76 11 HIToolbox 0x00007fff89930a4d SendTSMEvent + 35 12 HIToolbox 0x00007fff89930dd4 SendUnicodeTextAEToUnicodeDoc + 452 13 HIToolbox 0x00007fff8993095e TSMKeyEvent + 629 14 HIToolbox 0x00007fff8976f81a TSMProcessRawKeyEvent + 2350 15 AppKit 0x00007fff910fbade -[NSTextInputContext handleEvent:] + 639 16 AppKit 0x00007fff90fc7eaf -[NSView interpretKeyEvents:] + 248 17 AppKit 0x00007fff90f40c65 -[NSTextView keyDown:] + 691 18 AppKit 0x00007fff90a20544 -[NSWindow sendEvent:] + 7430 19 AppKit 0x00007fff909b868f -[NSApplication sendEvent:] + 5593 20 AppKit 0x00007fff9094e682 -[NSApplication run] + 555 21 AppKit 0x00007fff90bcd80c NSApplicationMain + 867 22 myapp 0x0000000100001302 main + 34 23 myapp 0x00000001000012d4 start + 52 </code></pre> <p>It seems that shortened string causes some out-of-bounds spill.</p> <p>What am I doing wrong and how can I fix this issue? Please help.</p>
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    1. COSomehow I also have problems with this kind of issue: I am trying to add attributes asynchronously but it produces the same error. I'm really wondering where this error comes from.
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