> On 11 Feb 2016, at 20:44, Dan Lau wrote:
>
> If a file has its contents mapped using NSData's
> initWithContentsOfFile + NSDataReadingMappedIfSafe,
> deleting it doesn't appear to affect reading it's mapped contents. Does
> anyone know if NSData uses mmap(2) under the hood to ensure that this
Hi Chris,
Let me start with what I'm trying to accomplish. I have an app that
is constantly running an animation, which's attributes are
determined after downloading and parsing some XML.
How large are the XML files? Does each contain multiple animation
steps or just one?
The XML is
On Mar 2, 2010, at 10:18 PM, Jeff Johnson wrote:
> My question is, how do I use NSXMLDocument safely on a non-main thread? I
> need to do this for performance reasons, otherwise my app can pinwheel during
> XML parsing.
Maybe you need faster XML parsing?
Marcel
__
On Apr 9, 2010, at 10:35 , McLaughlin, Michael P. wrote:
> My main thread has an NSArray of Subtasks and sends data to each via
>
> Npending = numProcessors;
> for (k = 0;k < numProcessors;k++) {
> Subtask *aTask = [myTask objectAtIndex:k];
> [aTask sendData:&theData numBytes:sz ta
Hi Andrew,
On Jan 13, 2012, at 6:57 , Andrew wrote:
> The result of this is that the UI updates really frequently and the
> estimated time to complete and the download rate jump around a lot. I
> would love it if I could tell cocoa to only update the UI once per
> second instead of immediately wh
On Jan 13, 2012, at 15:23 , Eric E. Dolecki wrote:
> I have XML like this:
>
>
>
>
>
>
>
>
Don't know much about TBXML, but with MAX, the following code parses the file
(including model classes and scaffolding):
-- snip
#import
@interface User:NSObjec
Hi Kyle,
On Jan 14, 2012, at 18:37 , Kyle Sluder wrote:
> On Jan 14, 2012, at 2:53 AM, Marcel Weiher wrote:
>> You shouldn't push updates to the UI, the UI should query the model, and it
>> should do it at "human speed", not at whatever speed the machine can
On Jan 19, 2012, at 1:33 , Ken Thomases wrote:
> On Jan 18, 2012, at 6:12 PM, Marcel Weiher wrote:
>> On Jan 14, 2012, at 18:37 , Kyle Sluder wrote:
>>
>>> Breaking this pattern should be a conscious decision.
>>
>> I'd say that the opposite is tr
Hi Ian,
well, in a sense the lack of examples *is* illustrating the best practices
concerning setup wizards :-)
Cheers,
Marcel
On Jan 13, 2010, at 9:54 , Ian Piper wrote:
> For one of my applications I want to do a check at startup to see whether a
> profile and password has been set for th
On Jun 24, 2009, at 11:00 , Bill Bumgarner wrote:
On Jun 24, 2009, at 12:51 PM, Quincey Morris wrote:
In a nutshell, for folks like me who regularly use CFCreate …
CFRelease in loops, what are the benefits of GC?
If CFCreate/CFRelease is precisely what you want to do, there are
no benefit
On Jun 24, 2009, at 22:49 , Greg Titus wrote:
...whereas this part talks specifically about the collector. Is
there a downside in SnowLeopard to CFRetain/CFRelease when not
using the collector?
There's no _new_ downside to CFRetain/CFRelease. It's just the
existing downside (collected
On Jun 25, 2009, at 0:54 , Peter Duniho wrote:
Furthermore, it is more typical that there _is_ space already
available on the heap to satisfy an allocation request, and in a
typical GC system allocations are much faster than for the alloc/
free paradigm. I admit, I don't know the specific
MPWDrawingContext is a light-weight Objective-C wrapper around CoreGraphics
CGContextRef and corresponding functions.
Code is on Github:https://github.com/mpw/MPWDrawingContext
Infrequently Asked Questions:
Why would anyone need an Objective-C drawing context?
In short, while CoreGraphics
More specifically, CGContextBeginTransparencyLayer() and
CGContextEndTransparencyLayer() will do what you need, in case you can't use a
single bezier path.
You set the global alpha to the transparency you want, start the transparency
layer, draw *without the alpha*, end the transparency layer.
On Sep 11, 2012, at 4:28 , Charles Srstka wrote:
> On Sep 10, 2012, at 9:23 PM, Quincey Morris
> wrote:
>
>> It doesn't need "all the extra scaffolding". KVC will peer quite happily
>> into your instance variables by default. What you don't get for free, in
>> that case, is KVO compliance
ng-context.html
Hope this is useful.
Marcel
On Jun 16, 2012, at 21:37 , Marcel Weiher wrote:
> MPWDrawingContext is a light-weight Objective-C wrapper around CoreGraphics
> CGContextRef and corresponding functions.
>
> Code is on Github:https://github.com/mpw/MPWDrawingCont
On Mar 19, 2013, at 1:19 , Jens Alfke wrote:
>
> On Mar 18, 2013, at 5:14 PM, Rick Mann wrote:
>
>> NSArchiver calls look like -setValue:forKey:, so it seems reasonable that
>> the protocol could be usurped to write out fairly clean user defaults plists.
>
> There’s a lot of other gunk the
On Mar 22, 2013, at 23:27 , Quincey Morris
wrote:
> The reason for this is not much about performance. ('atomic' is slower, but
> not by much.)
On my machine, the difference is around 4x for the read accessor, 3 ns
nonatomic vs. 13ns atomic.
Cheers,
Marcel
___
> So I was looking for a graphics library in the Developer Docs that serves
> both Mac-Apps and iOS-Apps.
>
> I found references to polylines in a MapKit.
> There is of course Quartz2D and OpenGL.
>
> So which of these libraries or perhaps there is another I have not heard of
> yet is best at
Hi Jens,
On Apr 25, 2013, at 18:10 , Jens Alfke wrote:
> On Apr 25, 2013, at 1:20 AM, Oleg Krupnov wrote:
>
>> This breaks encapsulation of objects with block properties (e.g.
>> MyAnimation.completionBlock)
>
> I understand the problem you're describing (and yes, I've had a couple of
> memo
On Jul 8, 2013, at 18:04 , Jens Alfke wrote:
>
> On Jul 7, 2013, at 1:37 PM, Frederick Bartram wrote:
>
>> Have you tried using NSData to store C-arrays?
>
> Or alternatively use NSPointerValue to wrap a pointer to a malloc’ed C array
> as an object.
It seems to me that an array of float
On Aug 16, 2013, at 19:04 , Kyle Sluder wrote:
> On Aug 16, 2013, at 12:41 PM, "Gerriet M. Denkmann"
> wrote:
>> On 16 Aug 2013, at 22:59, Kyle Sluder wrote:
>>> Xcode does know this. But if you're building for 32-bit OS X, it will
>>> correctly complain.
>>
>> When I build for Mac OS X CGR
On Aug 16, 2013, at 19:04 , Kyle Sluder wrote:
> On Aug 16, 2013, at 12:41 PM, "Gerriet M. Denkmann"
> wrote:
>> On 16 Aug 2013, at 22:59, Kyle Sluder wrote:
>>> Xcode does know this. But if you're building for 32-bit OS X, it will
>>> correctly complain.
>>
>> When I build for Mac OS X CGR
On Aug 17, 2013, at 18:03 , Maxthon Chan wrote:
> On Aug 17, 2013, at 23:52, Marcel Weiher wrote:
>> On Aug 16, 2013, at 19:04 , Kyle Sluder wrote:
>>
>>> Stop using NSRect in your method prototypes and just use CGRect.
>>
>> This is c
On Aug 17, 2013, at 19:01 , Jean-Daniel Dupas wrote:
> Le 17 août 2013 à 17:55, Marcel Weiher a écrit :
>> However…if you care as much about dependency management as I do (and chances
>> are you don’t), and don’t have a direct dependency on CoreGraphics in that
>> code (a
On Aug 18, 2013, at 15:06 , Kyle Sluder wrote:
> On Aug 18, 2013, at 6:28 AM, Marcel Weiher wrote:
>> On Aug 17, 2013, at 19:01 , Jean-Daniel Dupas wrote:
>>
>>> You don't have to add explicit dependency to anything as NSGeometry.h
>>> already does that
Hi Gerriet,
On Aug 18, 2013, at 17:16 , Gerriet M. Denkmann wrote:
>> [Tom Davie]
>> Uhh sorry, my bad, I meant CG*Bitmap*ContextCreate…
>>
>> http://developer.apple.com/library/ios/documentation/graphicsimaging/Reference/CGBitmapContext/Reference/reference.html
>
> Ah, now I found lots of inf
On Aug 20, 2013, at 18:02 , Uli Kusterer wrote:
> On Aug 20, 2013, at 12:36 PM, Gerriet M. Denkmann
> wrote:
>> Well that much I know. And I also know that many NS/UI-things (which use
>> Objective-C) often have a CF-counterpart, which uses plain C and often these
>> are toll-free bridged. T
On Aug 21, 2013, at 17:24 , Jeff Kelley wrote:
>
> *** Terminating app due to uncaught exception 'NSInvalidArgumentException',
>> reason: '+[NSMethodSignature signatureWithObjCTypes:]: unsupported type
>> encoding spec '(' in '(_GLKMatrix4={?=}[16f])8@12''
>
>
> I’m not too fa
Hi Diederik,
On Aug 22, 2013, at 1:44 , Diederik Meijer | Ten Horses
wrote:
> The content is quite large, about 1MB, it is the full text of a law.
Hmm…that isn’t really that large, we have GHz computing buzz-saws!
> The web service returns the list lightning fast, but in order to get the
>
On Aug 22, 2013, at 19:43 , Steve Mills wrote:
> On Aug 22, 2013, at 12:31:55, Thomas Wetmore
> wrote:
>
>> Pre-allocation doesn't really matter as long as the re-allocations, whenever
>> they occur, respect the capacity argument.
>
> Sure they do. If you don't preallocate, but instead keep
On Aug 24, 2013, at 22:09 , Andreas Grosam wrote:
> What's the purpose of NSValue's class method
>
> + (NSValue *)valueWithBytes:(const void *)value objCType:(const char *)type; ?
>
> It seems, NSValue will simply memcpy the content of value, and "somehow"
> determine the size in bytes from
On Aug 21, 2013, at 18:18 , Erwin Namal wrote:
> Hi,
>
> My app's menu extra icon should reflect meaningful information to the user.
> However, there are too many cases to draw icons beforehand. It would be
> easier to programatically prepare the icon on the fly.
> What would be the best way
On Aug 27, 2013, at 14:46 , Graham Cox wrote:
> Parsing a PDF, I need to handle the Tf (set font) operator. The font
> situation in PDF files is inordinately complicated, and reading the spec
> alone is not really leading to the light-bulb moment.
Yes, there are many dark tunnels ahead...
>
Hi folks,
does anyone have practical experience with the forward/backward compatibility
aspect of keyed archiving? That is define a file format using keyed archiving
where backward and forward compatibility was both desirable and achieved?
Thanks!
Marcel
Hi Uli,
thanks for your in-depth response!
On Aug 28, 2013, at 20:38 , Uli Kusterer wrote:
> On Aug 28, 2013, at 4:53 PM, Marcel Weiher wrote:
>> does anyone have practical experience with the forward/backward
>> compatibility aspect of keyed archiving? That is define a fi
On Aug 28, 2013, at 16:02 , Graham Cox wrote:
> It seems overall that I was right in that once you can get to a stream (font
> file) or a name, you're home and dry.
"Home and dry" might be overstating things a bit :-) You’re at the starting
line.
> CGFontCreateWithDataProvider obviously im
Hi Graham,
thanks for sharing your experience, that’s really helpful!
On Sep 1, 2013, at 11:54 , Graham Cox wrote:
> On 31/08/2013, at 6:48 PM, Marcel Weiher wrote:
>> So you’ve had good practical experience with forward/backward compatible
>> designs?
>
> Yes.
>
On Sep 1, 2013, at 18:26 , Uli Kusterer wrote:
> Honestly, I wouldn’t use non-keyed archiving anymore these days. Either you
> need performance so badly that you create your own file format (or use
> something specialized for a particular need, like sqlite), or you use keyed
> archiving. It’s
On Sep 4, 2013, at 10:56 , Jonathan Taylor
wrote:
> On 3 Sep 2013, at 19:49, Marcel Weiher wrote:
>> Unless there is some dire reason not to do this, I would make a copy on the
>> main thread every time the UI changes, and stash that copy somewhere the
>> worker thread
On Sep 3, 2013, at 12:52 , Jonathan Taylor
wrote:
> I have an objective c object which contains a number of properties that serve
> as parameters for an algorithm. They are bound to UI elements. I would like
> to take a snapshot copy of the object that will be used for one whole run of
> the
[this seems to have bounced earlier]
Hi Kyle, Izak,
On Aug 16, 2013, at 19:18 , Kyle Sluder wrote:
> As Ken Ferry described in his Auto Layout session at WWDC 2011, the specific
> solver used by Apple is based on the Cassowary constraint engine.
Yes, the algorithm involved is a variant of the
On Sep 9, 2013, at 9:44 , Kyle Sluder wrote:
> Thirded.
Countered. :-)
> I thought I wouldn't like it.
I thought I would LOVE it, and when I actually used it was “meh”. Not just the
additional rules/complexity when dealing with the C side of things (which I do
quite a bit), but more import
On Sep 9, 2013, at 11:33 , Tom Davie wrote:
>> On 9 Sep 2013, at 10:18, Jean-Daniel Dupas wrote:
>>
>> And does the profiler explicitly shows that ARC runtime code is the culprit
>> ?
>
> Yes, it does.
Isn’t it strange how when someone says “oh, and ARC is faster”, without
measurements, t
On Sep 3, 2013, at 16:54 , Fritz Anderson wrote:
> On 2 Sep 2013, at 12:47 AM, Marcel Weiher wrote:
>
>> This gets (mis-)quoted out of context way too much (my emphasis):
>>
>> "We should forget about small efficiencies, say about 97% of the time:
>>
Hi Jens,
Premature optimization is the root of all evil!
Er, I misspelled: “very cool, nice job!”
On Sep 9, 2013, at 18:11 , Jens Alfke wrote:
> [..]
> [fg160,160,160;16:34:40.488| [fg0,128,0;[;NSDateFormatter took 26.97 µsec
> [fg160,160,160;16:34:48.649| [fg0,128,0;[;CBLParseDate
On Sep 9, 2013, at 19:05 , Jean-Daniel Dupas wrote:
>
> Le 9 sept. 2013 à 18:11, Jens Alfke a écrit :
>
>> [fg160,160,160;16:34:40.488| [fg0,128,0;[;NSDateFormatter took 26.97
>> µsec
>> [fg160,160,160;16:34:48.649| [fg0,128,0;[;CBLParseDatetook 0.47
>> µsec (58x)
>
> Isn't
On Sep 9, 2013, at 19:20 , Tito Ciuro wrote:
>> On Sep 9, 2013, at 10:14 AM, Marcel Weiher wrote:
>> Premature optimization is the root of all evil!
> What's premature about it?
Nothing:
>> Er, I misspelled: “very coo
On Sep 9, 2013, at 19:35 , Jens Alfke wrote:
>
> On Sep 9, 2013, at 10:14 AM, Marcel Weiher wrote:
>
>> Premature optimization is the root of all evil!
>
> I’m not sure if you meant that ironically, but it’s absolutely not premature.
Absolutely! On both counts. It
Just to add a tiny wrinkle:
On Sep 9, 2013, at 20:27 , Jens Alfke wrote:
> On Sep 9, 2013, at 10:48 AM, Jeffrey Oleander wrote:
>> [..] Some do, but the dread of customer rebellion is strong, and they want
>> to enter them in the slap-dash, hurried, harried ways they're used to
>> writing them
On Sep 10, 2013, at 21:52 , Ken Thomases wrote:
> On Sep 9, 2013, at 3:49 AM, Marcel Weiher wrote:
>
>> The pattern I adopted long ago to avoid that sort of situation is to have an
>> instance variable for my temps, in which case the code becomes:
>>
>>
Hi John!
On Sep 10, 2013, at 19:26 , John McCall wrote:
> On Sep 9, 2013, at 4:15 AM, Marcel Weiher wrote:
>> [Optimizations in ARC are there to mitigate pessimizations]
>
> For what it’s worth, the autorelease optimization was planned; the
> performance problem it so
On Jun 15, 2008, at 10:09 , Philip Lee Bridson wrote:
Firstly I need a function to automatically run from a class used in
MainMenu.nib when the main.m calls NSApplicationMain();
The NSApplication object provides this facility:
http://developer.apple.com/documentation/Cocoa/Reference/Applica
Some minor factual corrections:
On Jul 2, 2008, at 18:33 , Michael Ash wrote:
In Cocoa you do lots of retaining and releasing. These operations
aren't free. They involve a lookup into a global hash table and some
sort of atomic increment/decrement operation.
The hash table is only used by NS
On Jul 10, 2008, at 9:50 , Michael Ash wrote:
On Thu, Jul 10, 2008 at 12:17 PM, Marcel Weiher <[EMAIL PROTECTED]
> wrote:
[hash tables not generally used + internal refcounts]
Atomic updates are still a pretty big hit on a multiprocessor system
(all of them, these days),
Yes, t
There are several ways to share the implementation:
1. Do nothing, CF and Foundation already do it for most of their
objects
(and they share their implementation...probably
unreasonably...)
This, obviously, doesn't work for your own classes.
But a lot of the objects you will use
On Jul 10, 2008, at 20:16 , Graham Cox wrote:
I'm using NSBitMapImageRep's -representationUsingType:properties:
method to convert data to JPEG, TIFF, etc. I'd like to be able to
specify the DPI of the image. I can calculate the right number of
pixels needed for a given DPI OK, but the imag
On Jul 11, 2008, at 8:59 , Michael Ash wrote:
The cost of a single refcounting op is negligible compared to the
cost of
object allocation, so these two are quite irrelevant.
A quick test of this claim would appear to disprove it. On my Mac Pro,
an alloc/init/release cycle of NSObject costs
On Jul 11, 2008, at 12:53 , Michael Ash wrote:
Seems that NSString and NSMutableString are just faster at everything.
In all cases, the cost of an extra retain/release for them is still
roughly 50% of the cost of an alloc/init/retain. Here are my raw
numbers, times in nanoseconds:
[timings sn
On Jul 12, 2008, at 8:25 AM, Michael Ash wrote:
On Sat, Jul 12, 2008 at 2:25 AM, Marcel Weiher <[EMAIL PROTECTED]
> wrote:
So as I said: (a) object allocation slowest (b) out-of-band
retain count
slow (c) inline retain count much faster than either.
Well that all makes sense,
On Jul 12, 2008, at 13:42 , Michael Ash wrote:
http://www.opensource.apple.com/darwinsource/projects/apsl/CF-476.10/CFRuntime.h
typedef struct __CFRuntimeBase {
uintptr_t _cfisa;
uint8_t _cfinfo[4];
#if __LP64__
uint32_t _rc;
#endif
} CFRuntimeBase;
I guess this isn't the right one,
On Jul 17, 2008, at 14:11 , Philip Mötteli wrote:
What I'm asking is, if you can
identify everything that is not a too-many relationship, find them
via
a process of elimination (if it's not something I can identify, then
it must be a too-many).
But I can't make this analysis every-time an
On Jul 18, 2008, at 14:22 , Ivan wrote:
Since NSXMLDocument is no longer (or never had really been) part of
the iPhone SDK, now I find my app can't be run on my iPhone. So, I
wonder if is there any way I could take to keep on with my
development. Just found tidylib at sourceforge, but don
On Jul 19, 2008, at 18:34 , Ian Joyner wrote:
On 19/07/2008, at 11:36 PM, Michael Ash wrote:
The universe of programming languages extends far beyond this little
island of ALGOL-lookalikes. Objective-C messaging syntax is utterly
mundane compared to many common, useful syntaxes used in practi
On Jul 21, 2008, at 13:03 , Philippe Mougin wrote:
Le 21 juil. 08 à 20:50, Markus Spoettl a écrit :
I'm wondering if there is a general rule or mechanism that suggests
what to do in such a case. For instance, how are delegates
implemented in AppKit, are they retained? If so, when are they
On Jul 22, 2008, at 9:21 , Jonathon Mah wrote:
Are Xcode build settings exposed as pre-processor variables? I know
they're available when pre-processing Info.plists, but can't find a
way to use them in source code files (.m).
It's not Xcode build settings, but gcc does have predefined macr
On Jul 22, 2008, at 11:52 , Philippe Mougin wrote:
Le 22 juil. 08 à 06:21, Marcel Weiher a écrit :
http://portal.acm.org/citation.cfm?id=1035292.1028982
There are also interesting bits in their conclusion:
"This explains why highly optimized tracing and reference counting
collectors
On Aug 2, 2008, at 14:19 , Jacob Bandes-Storch wrote:
I'm trying to use my application icon (icns) in a custom view to be
draw in the background of a window, like Installer.app does. I can
do all this just fine, but when I draw the image using -
drawInRect:fromRect:operation:fraction:, it c
On Aug 5, 2008, at 2:57 , Uli Kusterer wrote:
You may fire off observer methods too, which is probably undesirable.
Lucky then, that I adopted GNUstep-style ASSIGN() and DESTROY()
macros for these purposes, and since most of my code still needs to
be 10.4-compatible, I've mostly been usin
On Aug 5, 2008, at 15:28 , Uli Kusterer wrote:
On 05.08.2008, at 22:24, Marcel Weiher wrote:
On Aug 5, 2008, at 2:57 , Uli Kusterer wrote:
Lucky then, that I adopted GNUstep-style ASSIGN() and DESTROY()
macros for these purposes, and since most of my code still needs
to be 10.4
On Aug 17, 2008, at 4:41 , Roland King wrote:
I started building a Cocoa app then decided that I wanted to build
myself a little command-line tool to test the classes I'm writing.
Perhaps it should be a Unit test but I thought perhaps I'd learn
those another day. So I added a command-line
On Aug 20, 2008, at 6:14 PM, John C. Randolph wrote:
On Aug 20, 2008, at 5:04 PM, j o a r wrote:
On Aug 20, 2008, at 4:56 PM, John C. Randolph wrote:
Personally, I prefer "if (!foo)" over "if (foo == nil)", because
the latter has the hazard of a typo that compiles. You can lose a
fair bit
On Aug 19, 2008, at 6:33 AM, Carmen Cerino Jr. wrote:
if ([_delegate respondsToSelector:
@selector(SGDecompDataProc:)]){
[_delegate SGDecompDataProc:pixelBuffer
trackingFlags:decompressionTrackingFlags
disp
On Sep 5, 2008, at 4:52 , Michael Ash wrote:
But at run time they are the same type. If you disagree, just create
an NSArray and a CFArray (with the standard CFType callbacks) and try
to tell the difference between them!
This is true for NSArray, because it will create an NSCFArray under
t
On Sep 19, 2008, at 14:15 , Jordon Hirshon wrote:
How can I read a file a line at a time (i.e. getline)? I'm trying
to do this in a Cocoa Framework.
You could just use the POSIX fgets() call...
Marcel
___
Cocoa-dev mailing list (Cocoa-dev@lis
Just a quick note that I have just released version 4.3 of Objective-
XML, an efficient and convenient XML framework for Cocoa (Touch):
http://www.metaobject.com/downloads/Objective-C/Objective-XML-4.3.tgz
From the Readme:
Objective-XML is an XML processing framework for Objective-C.
On Oct 29, 2008, at 1:46 PM, Joel Norvell wrote:
First, I wanted to thank Aki Inoue and Rob Keniger for pointing out
the problem with my NSData->NSString->NSData approach.
As an alternative, would it be fruitful to use a Directory Wrapper
to represent the data as two files; one the metada
On Mar 12, 2009, at 8:39 AM, Bill Bumgarner wrote:
On Mar 12, 2009, at 6:04 AM, John Engelhart wrote:
[ way too many words deleted ... please try to succinctly
state issues in the future ]
You have created a micro benchmark that demonstrates a significant
bit of overhead from
On Mar 12, 2009, at 10:54 AM, Bill Bumgarner wrote:
On Mar 12, 2009, at 10:29 AM, John Engelhart wrote:
Actually, this isn't a "micro-benchmark".
If you aren't displaying the results, responding to user events,
keeping an application state up to date and otherwise doing all of
the things
On Mar 14, 2009, at 3:29 , Paul Sanders wrote:
How about perl instead? (I don't think egrep is a fair test, it
doesn't have to 'do anything' with the results, like create a new
string from them). This is a rough perl equivalent of my original
problem:
I guess that's the point I was trying to
On Mar 23, 2009, at 19:53 , Development wrote:
I'm using an an NSXMLParser to parse a document. some of the
elements are as follows: Some Thingelement>
The problem is that I cannot seem to come up with the element's
property. During the parse which callback is going to give me the
property
On Mar 23, 2009, at 20:13 , Dave Geering wrote:
On Tue, Mar 24, 2009 at 1:53 PM, Development
wrote:
I'm using an an NSXMLParser to parse a document. some of the
elements are as
follows: Some Thing
The problem is that I cannot seem to come up with the element's
property.
During the parse w
If you like that type of higher-level, more Objective-C-like approach,
you might want to have a look at Objective-XML, and more specifically
the MAX parser ( MAX = Message oriented API for XML):
http://www.metaobject.com/blog/2009/01/iphone-xml-performance.html
http://www.met
On Apr 1, 2009, at 21:44 , Michael Ash wrote:
On Thu, Apr 2, 2009 at 12:33 AM, Ryan Joseph
[distinguishing between NSArray and CFArray]
The test cannot be performed, because the question does not make any
sense.
While this answer is mostly true for what the original poster is
trying to ac
On Apr 2, 2009, at 13:54 , Michael Ash wrote:
On Thu, Apr 2, 2009 at 3:20 PM, Marcel Weiher
wrote:
On Apr 1, 2009, at 21:44 , Michael Ash wrote:
On Thu, Apr 2, 2009 at 12:33 AM, Ryan Joseph
[distinguishing between NSArray and CFArray]
The test cannot be performed, because the question
NSArray
/ \
NSCFArrayMYNSArray
From the Objective-C perspective, there is no such thing as NSArray;
Sure there is.
it is a class cluster,
So apart from being a class cluster (which is also "something" and not
"no thing") it is also an actual c
[On Apr 2, 2009, at 15:24 , Michael Ash wrote:
yes/no/yes/no/yes/no...]
Your answer is correct if and only if the NSArray in question is a
NSCFArray. If the NSArray in question is not a NSCFArray, the
question is
valid (thought possibly not what the original author intended) and
the tes
On Apr 2, 2009, at 16:43 , Chris Suter wrote:
On Fri, Apr 3, 2009 at 10:37 AM, Marcel Weiher > wrote:
So the compiler also disagrees with you that these are the same
type. You
can *cast* them to be compatible, but they are not the same type.
Right, but the original question was ab
On Apr 2, 2009, at 17:06 , Marcel Weiher wrote:
As I explained, it is trivially possible, because the only Objective-
C class that is the same as its underlying CFType is NSCFArray.
That is, of course, nonsense. All the other bridged class are as well,
but NSArray itself or other direct
On Apr 2, 2009, at 17:54 , Chris Suter wrote:
On Fri, Apr 3, 2009 at 11:06 AM, Marcel Weiher > wrote:
As I explained,
Did you?
Yes.
it is trivially possible, because the only Objective-C class
that is the same as its underlying CFType is NSCFArray. So a
simple test
would be [obj
On Apr 2, 2009, at 18:44 , Michael Ash wrote:
On Thu, Apr 2, 2009 at 7:37 PM, Marcel Weiher
wrote:
It can be
distinguished from an array created using CFArrayCreate, just as it
can be distinguished from an array created using [NSArray array],
Glad that you agree that the test can be
On Apr 2, 2009, at 23:22 , Chris Suter wrote:
Hi Marcel,
[snip]
However, that does not mean that they are the same.
They are the effectively the same and I couldn't see anything in your
e-mail that proves otherwise.
I have said from the very beginning "while the anser is mostly true
for
On Apr 3, 2009, at 9:06 , Michael Ash wrote:
Of *course* I mean NSArray itself. What did you *think* I meant?
Whenever I say NSArray I mean, hello, NSArray.
That's what I thought, thanks for clarifying! I was getting worried
there for a bit...
And it is *not* pointless. Every instance o
On Apr 4, 2009, at 5:01 , Graham Cox wrote:
One problem I've had occasional reports of is that the expiry is
prematurely detected, and it seems to be on systems with system
language set other than English. I need to store and check the dates
in a way that is not sensitive to this. I though
On Apr 3, 2009, at 14:18 , Mark Bateman wrote:
Hi
I have a csv file I want to use as a source for a searchable list
The csv has 16 fields. I have managed to read the csv line by line
into an array
You don't necessarily need to read the lines into an array, you can
just process them one-b
On Apr 1, 2009, at 19:04 , Sam Krishna wrote:
Does anyone here know of any Obj-C functional equivalent to Python
generator functions? These are *categorically* different that the
Spotlight API generator functions.
http://is.gd/qcYt
There is no direct equivalent at the language level, beca
On Apr 4, 2009, at 9:02 , George King wrote:
I hit a stumbling block when passing large files (multi-GB) to
NSXMLParser.
Are you doing this in 64 bit?
It appears that NSXMLParser's initWithContentsOfURL: method loads
the contents of the entire file into memory, which is causing
virtual
On Apr 5, 2009, at 8:15 , Michael Ash wrote:
Note that, as far as I know, there is no guarantee that -hash will
return the same value for the same object across runs of your program.
And in fact this has changed in the past.
Marcel
___
Cocoa-dev
On Apr 5, 2009, at 9:35 , George King wrote:
Yes, probably. Have you tried initializing it with a memory-mapped
NSData instead of an NSURL?
Thank you for the suggestion; I was unaware of
initWithContentsOfMappedFile:. This worked to a certain extent, in
that it kept memory consumption to
On Apr 7, 2009, at 20:34 , Daqi Pei wrote:
Hi everyone. I'm new to Objective-C but I've been working with C++ for
years. I'm trying to understand how the selector mechanism works.
I think the best reference for that would be Brad Cox's original book
on Objective-C.
In short: selectors *a
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