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SHA-256 digests in Ruby on Leopard

wzph — Sun, 13 Dec 2009 02:35:13 +0000

http://railsforum.com/viewtopic.php?id=35600

Advent2009

wzph — Tue, 01 Dec 2009 00:57:30 +0000

It’s been a while since I posted here! I’ve got a couple of iPhone apps in the app store now. So that’s fun. Here’s a link to the more timely of the two: http://advent2009app.com (iTunes App Store Link is here).

It’s an advent calendar, for each day from December 1 through December 25, 2009. Casson Demmon of The Make Studio and I put it together, and we’re really excited about the results. Take a look!

SQLitePersistentObjects and SQLPOTests

wzph — Thu, 12 Mar 2009 07:05:09 +0000

I’ve been using Jeff LaMarche’s SQLitePersistentObjects library for sqlite access on the iPhone. It’s a very young, but very promising library.

Some discussion on the mailing list prompted me to create SQLPOTests, a sample app that allows you to play with three different backings for a UITableView. I think there are more entries in the sample db than a typical iPhone app will likely sport (i.e., there are 6000 rows in 3 tables), but I’m amazed at the performance gain on scrolling when using the +pairedArrays method instead of loading full objects.

First SBiPhoneDev Meeting

wzph — Thu, 19 Feb 2009 05:25:50 +0000

Tonight was the inaugural SBiPhoneDev meeting. It was a fantastic group. We even had a celebrity–Andrew Duncan!

Here are notes, with a link to the slides and code we went over.

If you couldn’t make it tonight, come join us March 18!

STAssertEmpty & STAssertNotEmpty

wzph — Thu, 05 Feb 2009 22:55:16 +0000

Update 2009-02-05 15:56: Evaluating the a1s.

Google's iPhone enhancements to the SenTestingFramework are great. But sometimes you just need a little more syntactic sugar.

Below are a couple of macros you can add to your GTMSenTestCase.h file. Each takes an object that responds to -count. You can figure the rest out.

PLAIN TEXT

// Generates a failure when [a1 count]> 0
// Args:
// a1: Something that responds to -count
// description: A format string as in the printf() function. Can be nil or
// an empty string but must be present.
// ...: A variable number of arguments to the format string. Can be absent.
#define STAssertEmpty(a1, description, ...) \
do { \
id a1Value = ( a1 ); \
if ( [a1Value respondsToSelector:@selector( count ) ] ) { \
int _count = ([a1Value count]);\
NSString *_expression = [NSString stringWithFormat:@"Expected an empty %@, count is %d.", [a1Value className], _count]; \
if (description) { \
_expression = [NSString stringWithFormat:@"%@: %@", _expression, STComposeString(description, ##__VA_ARGS__)]; \
} \
STAssertEquals( 0, _count, _expression );\
}\
else {\
NSString *_expression = [NSString stringWithFormat:@"%@ Does not respond to -count.", [a1Value className]]; \
[self failWithException:[NSException failureInFile:[NSString stringWithUTF8String:__FILE__] \
atLine:__LINE__ \
withDescription:_expression]]; \
}\
} while (0)
// Generates a failure when [a1 count] <1
// Args:
// a1: Something that responds to -count
// description: A format string as in the printf() function. Can be nil or
// an empty string but must be present.
// ...: A variable number of arguments to the format string. Can be absent.
#define STAssertNotEmpty(a1, description, ...) \
do { \
id a1Value = ( a1 ); \
if ( [a1Value respondsToSelector:@selector( count ) ] ) { \
int _count = ([a1Value count]);\
NSString *_not_empty_expression = [NSString stringWithFormat:@"Expected a non-empty %@, count is %d.", [a1Value className], _count]; \
if (description) { \
_not_empty_expression = [NSString stringWithFormat:@"%@: %@", _not_empty_expression, STComposeString(description, ##__VA_ARGS__)]; \
} \
STAssertLessThan( 0, _count, _not_empty_expression );\
}\
else {\
NSString *_expression = [NSString stringWithFormat:@"%@ Does not respond to -count.", [a1Value className]]; \
[self failWithException:[NSException failureInFile:[NSString stringWithUTF8String:__FILE__] \
atLine:__LINE__ \
withDescription:_expression]]; \
}\
} while (0)

malloc: unable to create stack log directory /tmp/stack-logs.

wzph — Tue, 27 Jan 2009 07:30:05 +0000

Getting errors like the one above when switching from the iPhone Simulator to an actual device?

Turn off MallocStackLogging.

Inserting, deleting, inserting rows in a UITableView

wzph — Fri, 23 Jan 2009 21:06:33 +0000

I've been working on a piece of an iPhone app that populates a UITableView with the results of a web service call. There's a button to load the data, and you can reload the data once it's loaded a first time. The reload makes another call to the web service—this is useful because the data may have changed.

I was initially using UITableView's

- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation

and

- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation

methods to handle this. It worked great, until the second request to the web service, when the simulator would drop into gdb, and I couldn't figure anything out.

This discussion suggested using

reloadData

instead. It works, but it's less than ideal. You lose the fancy animation when the data are removed. I can still use

insertRowsAtIndexPaths:withRowAnimation:

but the delete method is unusable. Too bad.

3 months?!

wzph — Thu, 22 Jan 2009 21:41:38 +0000

Wow, that's quite a hiatus. The holidays have come and gone. The Obaminauguration has come and gone. And here we are, hip deep in recession.

I've been making quite a bit of progress in learning the iPhone SDK. More on that later. I thought for now I'd link to an interesting story about the exemption from federal privacy rules that Obama is giving YouTube.

I guess loyalty has its rewards. (Search for Schmidt, Mayer, Page, Costolo, Drummond, and Hurley from Google, which owns YouTube.)

Political Roasts

wzph — Fri, 17 Oct 2008 03:57:51 +0000

Good stuff from Obama (1, 2) and McCain (1, 2).

Where am I?

wzph — Thu, 11 Sep 2008 04:41:27 +0000

Working with the CoreLocation API in the iPhone simulator, I logged my latitude, longitude to the console:

<+37.33168900, -122.03073100> +/- 100.00m

Hmm, that doesn't look quite like Santa Barbara. Where could it be?

View Larger Map

1 Infinite Loop. Zoom in to see the Apple campus.