MRo Blog

Having a validating parser in place can reduce the required code to parse XML a lot – you know very well what you actually get. As mentioned in my last post about RELAX NG & trang, I prefer RELAX NG over W3C XML Schema – which doesn’t matter anyway because Apple’s suggested XML parser doesn’t [...]

as the iPhone SDK comes with a rather dysfunctional NSURLCache — Apple suggests to implement it from scratch yourself in the code examples about caching — I went for just this. Until I came across the [NSKeyedUnarchiver unarchiveObjectWithData:...] not restoring userInfo, storagePolicy and data of NSCachedURLResponse. Couldn’t believe it and spent almost the whole day verifying [...]

After upgrading to Snow Leopard and XCode 3.2.1 I’ve seen such console output CAUnderRetain(32139,0xa0391500) malloc: *** error for object 0×3838000: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug when rotating the iPhone Simulator in a project with base SDK 3.0. This can be reproduced as follows: Create a fresh [...]

Though NSDateFormatter behaves slightly different than documented, the following might even be correct, as strange as it might look (mind the last two lines): -(void)testNSDateFormatterTrap { NSDateFormatter *lower = [[[NSDateFormatter alloc] init] autorelease]; lower.dateFormat = @"yyyy-MM-dd HH:mm:SS ZZZ";   NSDateFormatter *upper = [[[NSDateFormatter alloc] init] autorelease]; upper.dateFormat = @"YYYY-MM-dd HH:mm:SS ZZZ";   lower.timeZone = upper.timeZone [...]

Strange enough there’s no regular expression class in the iPhone SDK. Update: iOS 4 brings NSRegularExpression. My simple wrapper around the regex.h C API is not safe for unicode matching patterns but does the job e.g. for parsing URLs. If you need more, have a look at RegexKitLite. My simple wrapper has the interface: