10-14-2003, 04:37 PM | #1 (permalink) |
Banned
Location: 'bout 2 feet from my iMac
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long shot, but... any Obj-C coders use CoreFoundation and can help me out?
ok, well... I'm TRYING to use the CoreFoundation XML parser under OS X. right now I'm hitting a problem where it SIGBUS's when I call any inherited functions... code below. any hints, lemme know!
Code:
#import "xml.h" @implementation xml +(void)parseXML: (NSString *)path { NSLog(@"I am here!"); CFXMLTreeRef cfXMLTree; CFDataRef xmlData; CFURLRef pathURL = CFURLCreateFromFileSystemRepresentation ( kCFAllocatorDefault, [path cString], [path cStringLength], NO); // Load the XML data using its URL. NSLog(@"about to load the XML file"); CFURLCreateDataAndPropertiesFromResource(kCFAllocatorDefault, pathURL, &xmlData, NULL, NULL, NULL); // Parse the XML and get the CFXMLTree. NSLog(@"loaded XML, about to parse it!"); cfXMLTree = CFXMLTreeCreateFromData(kCFAllocatorDefault, xmlData, pathURL, kCFXMLParserSkipWhitespace, kCFXMLNodeCurrentVersion); NSLog(@"finished parsing"); //int childCount = CFTreeGetChildCount(cfXMLTree); THIS CRASHES IT. NSLog(@"childcount"); int index; CFXMLTreeRef xmlTreeNode; CFXMLNodeRef xmlNode; NSLog(@"about to for-loop"); for (index = 0; index < 2; index++) { NSLog(@"just about to call CFTree"); xmlTreeNode = CFTreeGetChildAtIndex(cfXMLTree, index); //SO DOES THIS. NSLog(@"called CFTree, calling CFXML"); xmlNode = CFXMLTreeGetNode(xmlTreeNode); CFShow(CFXMLNodeGetString(xmlNode)); //NSLog("%s\n",CFXMLNodeGetString(xmlNode)); } } @end 2003-10-14 17:28:24.799 experiment[13414] about to load the XML file 2003-10-14 17:28:24.807 experiment[13414] loaded XML, about to parse it! 2003-10-14 17:28:24.816 experiment[13414] finished parsing 2003-10-14 17:28:24.824 experiment[13414] childcount 2003-10-14 17:28:24.832 experiment[13414] about to for-loop 2003-10-14 17:28:24.840 experiment[13414] just about to call CFTree experiment has exited due to signal 10 (SIGBUS). note that it dies when it calls the CFTree function with a CFXMLTree object (XMLTree is a subclass of Tree, btw). I'm baffled... |
10-14-2003, 07:55 PM | #2 (permalink) |
Quadrature Amplitude Modulator
Location: Denver
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Don't worry, you'll find the bug eventually.
Seems to me that knowledge of the API would be most useful... and since I've never done ObjC I've never seen this API. Although I'd just as soon point out I've seen SIGBUS occur due to hardware issues.
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"There are finer fish in the sea than have ever been caught." -- Irish proverb |
10-14-2003, 08:04 PM | #4 (permalink) |
Banned
Location: 'bout 2 feet from my iMac
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don't see why they shouldn't be, but I'll give 'er a run through the debugger see what I get...
*edit* eats words... ok, now WHY is my treereference pointing at memory location 0x0 is hte question thanks for the shove in the right direction! Last edited by cheerios; 10-14-2003 at 09:17 PM.. |
10-21-2003, 10:50 PM | #6 (permalink) |
Quadrature Amplitude Modulator
Location: Denver
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Library bugs waste a lot of programmer time. That's why it's so important not to fall in the NIH syndrome. Because every rewrite will lose the bugfixes.
There was a good article about how Mozilla wasted so much by rewriting the source. Unfortunately I can't seem to find it at the moment, but it sure convinced me...
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"There are finer fish in the sea than have ever been caught." -- Irish proverb |
10-22-2003, 06:23 PM | #8 (permalink) |
WARNING: FLAMMABLE
Location: Ask Acetylene
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http://www.wikipedia.org/wiki/Not_Invented_Here
"Not Invented Here (or NIH) refers to the problem when people in companies continue to ignore existing solutions to problems because it was not created in-house. It is endemic to the computer industry. In many cases NIH occurs as a result of simple ignorance, as many companies simply never do the research to know if a solution already exists. But equally common are deliberate cases where the engineering staff rejects a solution, typically because they believe they can do better. Many millions of manhours and billions of dollars have been wasted as a result of NIH. "
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10-22-2003, 07:31 PM | #9 (permalink) |
Quadrature Amplitude Modulator
Location: Denver
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kel answered your question succinctly. It is indeed a very big problem in the computer industry.
It's one of the problems that open source software may help solve, but for now, that remains to be seen.
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"There are finer fish in the sea than have ever been caught." -- Irish proverb |
Tags |
coders, corefoundation, long, objc, shot |
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