Re: Persistent User Defaults

[Nathan Day]

Thats not completely correct modifying the preferences file directly or 
deleting it can take a while for the user defaults process to pick up the 
change, but you can force the user defaults process to pick up the changes with

killall cfprefsd

it can be a little bit complicated sometimes and the process can write out 
changes before you kill it, so sometime you have to kill make you change and 
then kill again.



> On 25 Apr 2018, at 3:42 am, Richard Charles  wrote:
> 
> On macOS an applications user defaults are stored in a preference plist file 
> located in ~/Library/Preferences.
> 
> If this file is deleted, user preferences for the application still persist 
> until the machine is rebooted. In other words if you want to start with a 
> clean set of user preferences not only must you delete the preference plist 
> file but you must also restart the machine.

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Re: NSTimer not firing when computer is inactive for a while.

[Nathan Day]

I should make it clear, this is a Mac OS X application.

Nathan Day

On 14 Nov, 2017, at 01:43 PM, Nathan Day <nathan_...@mac.com> wrote:

I have a background process that uses an NSTimer that is set to fire every 
minute, but when the computer is inactive for a while it will stop firing, its 
not until someone interacts with the computer the timer will start firing 
again. The timer is added to the main NSRunLoop, maybe the NSRunLoop needs to 
be kept active by user interaction, the background app has a status menu bar 
item to provide feedback when its active and provide a simple menu for basic 
user control.

I have checked "Prevent computer from sleeping automatically when the display is off" in 
Energy Saver, I have also tried setting "Turn display off after" to never but it doesn't 
make a difference, these are things we can control on the users machines because it runs on company 
computers.

The background app is kept alive by launchd as a User Agent and looks for new 
resources to be downloaded periodically, it needs to start downloading these 
resources not to long after they are available, they can take hours to download 
in some case, and they need to be available when the user returns to their 
computer. There is also a foreground app that talks to the background app to 
display the downloaded resources, a bit like iTunes and iTunes Helper.

Nathan Day
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NSTimer not firing when computer is inactive for a while.

[Nathan Day]

I have a background process that uses an NSTimer that is set to fire every 
minute, but when the computer is inactive for a while it will stop firing, its 
not until someone interacts with the computer the timer will start firing 
again. The timer is added to the main NSRunLoop, maybe the NSRunLoop needs to 
be kept active by user interaction, the background app has a status menu bar 
item to provide feedback when its active and provide a simple menu for basic 
user control.

I have checked "Prevent computer from sleeping automatically when the display is off" in 
Energy Saver, I have also tried setting "Turn display off after" to never but it doesn't 
make a difference, these are things we can control on the users machines because it runs on company 
computers.

The background app is kept alive by launchd as a User Agent and looks for new 
resources to be downloaded periodically, it needs to start downloading these 
resources not to long after they are available, they can take hours to download 
in some case, and they need to be available when the user returns to their 
computer. There is also a foreground app that talks to the background app to 
display the downloaded resources, a bit like iTunes and iTunes Helper.

Nathan Day
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iOS4.3 simulator with Xcode 4.4

[Nathan Day]

Does anybody know how to get the iOS4.3 simulator to work with Xcode 4.4, we 
need to support iOS 4 up. I did a google search and found a way to do it with 
earlier Xcode 4's, but when I try it with Xcode 4.4 the simulator complains it 
can not find the SDK.

Nathan Day
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Re: iOS4.3 simulator with Xcode 4.4

[Nathan Day]

Sorry this really belongs on the Xcode mailing list

Nathan Day

On 27/07/2012, at 11:53 AM, Nathan Day nathan_...@mac.com wrote:

 Does anybody know how to get the iOS4.3 simulator to work with Xcode 4.4, we 
 need to support iOS 4 up. I did a google search and found a way to do it with 
 earlier Xcode 4's, but when I try it with Xcode 4.4 the simulator complains 
 it can not find the SDK.
 
 Nathan Day

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Re: Write Finder plugin

[Nathan Day]

You can do this with Services if you are willing to have it in the services 
menu of the contextual menu, the user has to enable your service by going to 
System Preferences  Keyboard  Keyboard Shortcuts, you may be able to 
AppleScript that. If you are just writing scripts for you own use that you want 
to use from the Contextual Menu, do a google search for Mac Services 
AppleScripts. I think there is at least 1 app that lets you run scripts as 
services.

Doing it in Cocoa is pretty straight forward.

On 13/07/2012, at 3:45 PM, Rakesh Singhal rakesh.sing...@gmail.com wrote:

 Hi Eric,
 
 Thanks. I am trying to do it using Services but I couldn't find any sample
 code.  Can I do it in python?
 
 Regards,
 Rakesh Singhal
 
 On Tue, Jul 3, 2012 at 12:09 AM, Eric Schlegel eri...@apple.com wrote:
 
 
 On Jul 2, 2012, at 9:53 AM, Rakesh Singhal rakesh.sing...@gmail.com
 wrote:
 
 There are applications (eg. dropbox) which are able to create items in
 finder's contextual menu, not service. There should be some way to do it.
 
 There is no supported way to do this. Dropbox uses various hacks to make
 its way into the Finder process. Frequently, the current version of Dropbox
 is incompatible with a new release of Mac OS X and has to be disabled.
 Don't use them as a model.
 
 -eric
 
 
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Re: Crash when calling va_arg()

[Nathan Day]

For function you can write a macro version of your function which calls, you 
function and appends a NULL to the VA_ARG macro. I don't normally do this but I 
have done something similar where I wanted macros to add meta data to a class, 
that expanded out into compete class method implementations.

On 05/07/2012, at 11:09 AM, r...@rols.org wrote:

 I prefer the NULL sentinel too. You might like to check if
 __attribute__((sentinel(0,1))) added to your function header gets the
 compiler to warn you if you forget it, very useful that.
 
 Hi Fritz and Jens,
 
 It makes total sense now. Out of the two options (NULL sentinel vs a
 number to indicate the number of args), I would choose NULL because out of
 the two, it's more foolproof. Is there a consensus about which option is
 considered best practice?
 
 Thanks again,
 
 -- Tito
 
 On Jul 4, 2012, at 4:43 PM, Fritz Anderson fri...@manoverboard.org
 wrote:
 
 On 4 Jul 2012, at 6:30 PM, Tito Ciuro wrote:
 
 void blockStep(fooBlock firstBlock, ...)
 {
  va_list args;
  va_start(args, firstBlock);
  id result = nil;
 
  do {
  result = firstBlock(result, nil);
  NSLog(@%@, result);
  } while (nil != (firstBlock = va_arg(args, fooBlock)));
 
  va_end(args);
 }
 
 The output looks like this:
 
 2012-07-04 16:18:40.000 BlockStep[12418:303] One!
 2012-07-04 16:18:56.533 BlockStep[12418:303] One!, Two!
 
 I've eliminated the crash by adding a nil sentinel in blockStep():
 
  blockStep (
 ^ (id result, NSError **error) {
 NSMutableString *value = [NSMutableString new];
 [value appendString:@One!];
 return value;
 },
 ^ (id result, NSError **error) {
 NSMutableString *value = [NSMutableString new];
 if (nil != result) {
 [value appendString:result];
 [value appendString:@, ];
 }
 [value appendString:@Two!];
 return value;
 },
 nil
  );
 
 
 This allows it to work without crashing, but I'd like if possible to
 avoid having to place the sentinel. Any ideas?
 
 Not possible.
 
 Notionally, all parameters are passed to C functions in memory on a
 stack, which is unformatted and could contain anything. A function has
 no way of knowing how many parameters have been pushed onto the stack,
 or where the memory trails off into saved processor state and the like,
 or the types, or the amounts of memory they subtend….
 
 Most variadic functions require sentinels (usually NULL) to tell them to
 stop looking for parameters. The best-known exceptions are
 printf()-family functions, which know what to find on the stack because
 the format string tells them.
 
 — F
 
 --
 Fritz Anderson
 Xcode 4 Unleashed: Don't bring your bathroom copy into the kitchen —
 were you raised in a barn?
 http://x4u.manoverboard.org/
 
 
 
 
 
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Re: NSInteger vs int vs int32_t

[Nathan Day]

You are saying that the CPU read two 32bit int from the cache at the same time, 
and then does some bit manipulation to get the high or low 32bit word into a 
64bit register.

On 03/07/2012, at 11:00 AM, Scott Ribe scott_r...@elevated-dev.com wrote:

 On Jul 2, 2012, at 5:42 PM, David Duncan wrote:
 
 I suspect you are both talking past each other.
 
 Jens' assertion is that if you had a 128 byte cache, you could store either 
 8 64-bit integers or 16 32-bit integers in it. Whereas Kyle is asserting 
 that the CPU need only read 32-bits at a time (or less) from the cache for 
 opcodes that deal with 32-bits (or less) of data at a time.
 
 I don't think so; I think Kyle was asserting that for a 32-bit integer on a 
 64-bit machine, the CPU would read 64 bits from the cache.
 
 -- 
 Scott Ribe
 scott_r...@elevated-dev.com
 http://www.elevated-dev.com/
 (303) 722-0567 voice
 
 
 
 
 
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Re: NSInteger vs int vs int32_t

[Nathan Day]

It must if 64bits is read in that mean you have just read in two 32bit words. 
So to put a 32bit word in a 64bit register some bit must be ditched, in some 
way, and if the CPU is optimise to only work with 64bit word alignment (don't 
know how intel does it), then to get 32 bit aligned words it must do some bit 
shift.


On 05/07/2012, at 3:33 PM, Scott Ribe scott_r...@elevated-dev.com wrote:

 On Jul 4, 2012, at 11:28 PM, Nathan Day wrote:
 
 You are saying that the CPU read two 32bit int from the cache at the same 
 time, and then does some bit manipulation to get the high or low 32bit word 
 into a 64bit register.
 
 No, I'm not saying that at all.
 
 -- 
 Scott Ribe
 scott_r...@elevated-dev.com
 http://www.elevated-dev.com/
 (303) 722-0567 voice
 
 
 
 

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Re: Caching Streaming video

[Nathan Day]

OK here is a more detailed explanation of what I am doing

I start downloading the video file with a NSURLConnection

I then implement the received data delegate method like the following.

- (void)connection:(NSURLConnection *)aConnection didReceiveData:(NSData *)aData
{
bytesFetched += aData.length;
if( bytesFetched  kBytesRequiredBeforeStart  !hasCachedData )
// kBytesRequiredBeforeStart = 16
{
[[NSNotificationCenter defaultCenter] 
postNotificationName:kVideoURLCacheHasDataNotification object:self];
hasCachedData = YES;
}
[self.fileHandle writeData:aData];  // this file 
handle is not closed until after the video has finished downloading
}

The fileHandle is created like this

- (NSFileHandle *)fileHandle
{
if( fileHandle == nil )
{
NSError * theError = nil;
cachedURL = [[NSURL fileURLWithPath:[NSTemporaryDirectory() 
stringByAppendingFormat:@/%@, kTempFileName]] retain];
[[NSFileManager defaultManager] 
createFileAtPath:[self.cachedURL path] contents:nil attributes:nil];
fileHandle = [[NSFileHandle 
fileHandleForWritingToURL:self.cachedURL error:theError] retain];
if( fileHandle == nil )
[[NSNotificationCenter defaultCenter] 
postNotificationName:kVideoURLCacheErrorOccuredNotification object:self];
}
return fileHandle;
}

I also have a did finish delegate handling method like this

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
if( hasCachedData == NO )
{
[[NSNotificationCenter defaultCenter] 
postNotificationName:kVideoURLCacheHasDataNotification object:self];
hasCachedData = YES;
}
hasFinishedCaching = YES;
[[NSNotificationCenter defaultCenter] 
postNotificationName:kVideoURLCacheDidFinishLoadingNotification object:self];
}

I then have a method to observer the notification like the following

- (void)videoURLCacheHasDataNotification:(NSNotification *)aNotification
{
[self.videoController play];
}

where the videoController is an instance of MPMoviePlayerController created 
like below, cachedURL is the same one defined above.

- (MPMoviePlayerController *)videoController
{
if( videoController == nil )
{
NSURL   * theURL = self.videoURLCache.cachedURL;
NSLog( @Video URL = '%@', theURL );
videoController = [[MPMoviePlayerController alloc] 
initWithContentURL:theURL];
videoController.shouldAutoplay = NO;
[videoController setFullscreen:NO animated:NO];
videoController.view.autoresizingMask = 
UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin|UIViewAutoresizingFlexibleHeight;
videoController.repeatMode = MPMovieRepeatModeOne;
videoController.controlStyle = MPMovieControlStyleEmbedded;
videoController.view.frame = self.videoView.bounds;
[videoView addSubview:self.videoController.view];
}
NSParameterAssert(videoController != nil);
return videoController;
}


Now this work fine in the iPhone simulator but on my actually iPodTouch it 
stops at what I am assuming is 16, (I haven't check this). To get the 
entire video to play on my iPodTouch I have to move the [self.videoController 
play]; to a notification observer for the video did finish loading notification.


On 26/06/2011, at 8:05 PM, Nathan Day wrote:

 I am trying to playback video in my iOS app while I am loading and caching it 
 at the same time. I fetch the video using a NSURLConnection and then store it 
 in a local file, I start video playback of the local video file after a 
 certain number of bytes are received. I have it working great in the 
 simulator, I can start playing the video before I have received all of it, 
 but when I go to run my app on my iPodTouch, I can only seem to play up to 
 the number of bytes I had already received before I started playback. I can 
 only play the entire video if I wait until I have receive the entire file 
 before I start playback. I can also get the video to play completely if I 
 stop the failed attempt with a [video stop] message and then start playing it 
 again, pausing the video only doesn't work.
 
 Has anybody got this working, is it possible.
 
 
 Nathan Day
 Software Engineer
 home page:http://homepage.mac.com/nathan_day/

Nathan Day
Software Engineer
home page:  http://homepage.mac.com/nathan_day/







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http

Caching Streaming video

[Nathan Day]

I am trying to playback video in my iOS app while I am loading and caching it 
at the same time. I fetch the video using a NSURLConnection and then store it 
in a local file, I start video playback of the local video file after a certain 
number of bytes are received. I have it working great in the simulator, I can 
start playing the video before I have received all of it, but when I go to run 
my app on my iPodTouch, I can only seem to play up to the number of bytes I had 
already received before I started playback. I can only play the entire video if 
I wait until I have receive the entire file before I start playback. I can also 
get the video to play completely if I stop the failed attempt with a [video 
stop] message and then start playing it again, pausing the video only doesn't 
work.

Has anybody got this working, is it possible.


Nathan Day
Software Engineer
mobile: +61 (0)4 3863 2407
home page:  http://homepage.mac.com/nathan_day/







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Re: NSTimer not working in a multithreaded application

[Nathan Day]

NSTimers rely on there being an NSRunLoop for the current thread, so if you are 
creating a timer in a thread without a run loop it will not work, because the 
is no run loop to add the timer to. From the sounds of it you also want the 
timer to be executed in the main thread, in which case you will have to use one 
of the perform in main thread methods so the creation of you timer can happen 
in the main thread. You may alternatively be able to create a time and manually 
add it to the main runloop if the methods for that are thread safe, but I don't 
think they are. 

Sent from my iPad

On 03/09/2010, at 12:37, Abhijeet Singh abhi_...@in.com wrote:

 Hi,I am working on a multithreaded software that runs on a medical 
 instrument. The software has 2 parts. GUI and worker threads (worker threads 
 sends commands to instrument). The GUI is developed using ObjectiveC and 
 Cocoa. Worker threads are all in C and Carbon.It is a Cocoa application.I am 
 working on GUI of the software.When the application starts it first creates 
 worker threads ( that initializes the hardware/instrument). Once the threads 
 are created one of the thread sends a message back to main thread. My problem 
 isi need to start a timer when the main thread receives a message from worker 
 thread. I am starting a timer as follows:timer = [[NSTimer 
 scheduledTimerWithTimeInterval:10.0 target:self 
 selector:@selector(turnOffLight:) userInfo:nil repeats:NO] retain];But it 
 does not work. I debugged it and found that the timer is created but 
 turnOffLight is never executed.Then I created the timer just before worker 
 threads creation and it worked. Can anybody help me in res
 ol
 ving this problem.Thanks  RegardsAbhijeetGet Yourself a cool, short @in.com 
 Email ID now!Report spam
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Non full screen video on iPhone

[Nathan Day]

Is it possible to have none full screen video on the iPhone, I have try to just 
get a demo app going at the moment, I tried using a UIWebView with a video tag 
that that doesn't start playing until it becomes full screen. Any sample 
projects would be appreciated.

Nathan Day
Software Engineer
mobile: +61 (0)4 3863 2407
home page:  http://homepage.mac.com/nathan_day/







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Re: NSCoding between iOS and Mac OS X

[Nathan Day]

What about binary property lists, they should be interchangeable between iOS 
and Mac OS X?

On 26/08/2010, at 1:29 AM, Ricky Sharp wrote:

 A similar question came up recently. 
 
 While some objects (e.g. NSNumber) things should be binary compatible. But 
 you may run into issues.
 
 Also depends upon what objects you are coding. Mac OS X uses NSColor whereas 
 iOS uses UIColor. 
 
 I would recommend using an intermediate normalized format instead. Then write 
 independent code for each platform. 
 
 If archiving colors, capture normalized values like color mode (ARGB, HSL), 
 color components, etc. Then, rebuild up objects as needed. 
 
 For text data, I would use UTF-8 with the original text being normalized. 
 
 Sent from my iPhone
 
 On Aug 25, 2010, at 8:43 AM, Nathan Day nathan_...@mac.com wrote:
 
 Does anybody know whether NSCoding can be used to transfer data between iOS 
 and Mac OS X. Is this documented as guaranteed to work. I have tried to do a 
 google search but I got nothing, probably searching for the wrong thing.
 
 Nathan Day
 http://homepage.mac.com/nathan_day/
 
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NSCoding between iOS and Mac OS X

[Nathan Day]

Does anybody know whether NSCoding can be used to transfer data between iOS and 
Mac OS X. Is this documented as guaranteed to work. I have tried to do a google 
search but I got nothing, probably searching for the wrong thing.

Nathan Day
http://homepage.mac.com/nathan_day/

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NSXMLElement and namespaces

[Nathan Day]

Can anybody help me understand how namespaces works with NSXMLNode etc. There 
is the method

+ [NSXMLNode elementWithName:(NSString *)name URI:(NSString *)URI]


 Which takes an namespace URI, but doesn't seem to use it. I have seems an 
example from google where they pass the namespace URI and then use a name which 
uses the namespace prefix as part of the name, for exmaple

[NSXMLNode elementWithName:@xsl:value-of 
URI:@http://www.w3.org/1999/XSL/Transform;];

If you have to add the prefix to the name then what is the point of the URI 
argument.

Nathan Day
http://homepage.mac.com/nathan_day/

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Re: MyDocument.xib v MainMenu.xib

[Nathan Day]

If you have an application delegate you can add a IB instance variable to that.
Though what I usually do in your situation is to create a separate NIB and 
window controller for the inspector panel, I then have a showInspector method 
in my application delegate which will create the window controller if 
necessary, and then use notifications and notification observing to keep the 
inspector up to date with changes to the main window/document and changes in 
content.

On 30/12/2009, at 4:23 PM, David Blanton wrote:

 In a document based app I want to have some 'inspectors that reflect what i 
 sgoing on in the document.  These inspectors should float.
 
 If I make NSPanel's for the inspector in MyDocument.xib then each instance of 
 a document gets its own set of inspectors.
 
 I would like to have just one set of inspectors whose contents change as 
 different documents are activated.
 
 Putting the inspectors in MainMenu.xib will let me make just 'one set' for 
 all documents but I am unsure as to how to get a reference from the inspector 
 to the document given different xib's.
 
 Suggestion please.
 
 db
 
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Re: passing a method name?

[Nathan Day]

You can pass the hidden parameter _cmd which is of type SEL you can then use 
@selector(selector_name) to do your test, this whole thing you are doing 
sounds really strange, it would be good to see what you are doing to find a 
better approach. based on what little information your are giving us I would be 
sending an enum with each enum describing then option.

On 21/12/2009, at 12:18 AM, Chunk 1978 wrote:

 i have a bunch of methods that will call one method.  currently, i'm
 passing a string object so the called method will know which method
 had called it, and complete the proper task based on the method that
 called it.
 
 instead of creating strings and passing them, is it possible to pass
 the method name?
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Beach balling on mach_msg_trap

[Nathan Day]

I am getting a beach balling in an application I am working on, I  
would of investigated more but I have noticed that some other apps on  
my computer seem to be doing the same thing.


If I move my applications window it free up the block allowing an  
event to be processed), but the instantly freezes on the next event,  
this is why I think other applications have the same problem because  
they exhibit the same behaviour, this includes the Applications Safari  
when playing a movie, Quick Time Player but the sound keeps playing  
and a Third party app called Opacity. s this a known issues.


It doesn't affect my MacBook Pro only my iMac and the issue occurred  
in 10.5 and 10.6, I am using an NSOperationQue which may have  
something to do with it.


One thing that is different between my MacBook Pro and iMac is that my  
iMac is nearly always doing something in the background, without may  
app running there is about 15% to 20% cpu usage and about 500 thread,  
another difference between my iMac and my MacBook Pro is that my iMac  
has only 37% of 1TB hard disk space, I have heard there can be some  
issues with disk fragmentation at 30% or less hard disk space.


(gdb) where
#0  0x00010011ad7a in mach_msg_trap ()
#1  0x00010011b3ed in mach_msg ()
#2  0x00010047fce2 in __CFRunLoopRun ()
#3  0x00010047f03f in CFRunLoopRunSpecific ()
#4  0x00010242ac4e in RunCurrentEventLoopInMode ()
#5  0x00010242aa53 in ReceiveNextEventCommon ()
#6  0x00010242a90c in BlockUntilNextEventMatchingListInMode ()
#7  0x000100fc1520 in _DPSNextEvent ()
#8  0x000100fc0e89 in -[NSApplication  
nextEventMatchingMask:untilDate:inMode:dequeue:] ()

#9  0x000100f86a7d in -[NSApplication run] ()
#10 0x000100f7f798 in NSApplicationMain ()
#11 0x000134ba in main (argc=1, argv=0x7fff5fbff3c8) at  
XX


Nathan Day
Software Engineer
mobile: +61 (0)4 3863 2407
home page:  http://homepage.mac.com/nathan_day/







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Re: Hiding tab view items

[Nathan Day]

In general hiding bit of you interface depending on the state/ 
selection of you app is considered bad because it can confuse the  
user, if you disable elements then you are tell the user that the  
element is not available for the current state/selection etc., if you  
you hide elements then the user may think they have forgotten how to  
get to a particular feature and become frustrated as they try to find  
it. Also hiding elements can in some cases cause the remaining  
elements to move around which can allow confuse users (menu items for  
example), I am not saying you are wrong to do this in your case, only  
you can decided that.


On 13/10/2009, at 1:53 AM, BareFeet wrote:

I have a hierarchical list of objects, like the typical iTunes or  
XCode left pane. When the user selects a node in this hierarchy, I  
display detail of that node in the pane on the right. This right  
pane is divided into tab view items. Only some of the tab view items  
are relevant to each type of node, so I'd like to hide the tab view  
items that are not relevant. How can I do this?


Nathan Day
http://homepage.mac.com/nathan_day/

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Re: How can we draw a horizontal line with embossing effect?

[Nathan Day]

You could also try one of the draw bezel functions

NSDrawDarkBezel
NSDrawGrayBezel
NSDrawLightBezel
NSDrawWhiteBezel

with a height of 2, and a y value with a .5 decimal

On 11/09/2009, at 12:12 AM, Steven Degutis wrote:


Arun,
It's just two lines drawn on top of one another, with the top one  
darker
than the background and the bottom one lighter. I use it in my  
Preference

panels all the time.

--
Steven Degutis
http://www.thoughtfultree.com/
http://www.degutis.org/

On Thu, Sep 10, 2009 at 4:15 AM, Arun arun...@gmail.com wrote:


Hi All
How can we draw a horizontal line with embossing effect?  The  
attached

picture describes more clearly.

Thanks
Arun KA

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Re: document-based application

[Nathan Day]

That is the way I do it, I don't see why it wouldn't work 100% of the  
time, it would be nice if Apple had a way to insert a template  
chooser, but I would describe the way you have done it as 'an ugly  
hack'.


On 07/09/2009, at 3:24 PM, Oftenwrong Soong wrote:


Hi All,

In my doc-based app, I need to initially display a startup window  
instead of a new empty document. Its function would be somewhat akin  
to that of the Template Chooser that comes up when you launch Pages.


I've scoured the texts about the document architecture but cannot  
find pointers on how to do this.


So far this is the best idea I could come up with:

Implement NSApplication delegate applicationShouldOpenUntitledFile:,  
returning NO, and implement applicationDidFinishLaunching:, in which  
the startup window is launched. Then I manually call  
makeUntitledDocumentOfType:error.


It seems an ugly hack and I have a feeling it won't work 100% right.  
Is there a better way to implement an initial window in a doc-based  
app?


Thanks,
Soong





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Re: Creating table rows from XML

[Nathan Day]

What happens when you run it in the debugger, you say this is your  
first iPhone application if you are new to using a debugger then you  
really need to learn how to use that, it will make finding bugs like  
this a lot easier, for example you can break just before you add an  
object to you array (pages) and type 'po pages' in the terminal to see  
what pages is, if I have miss read you and you are familiar with the  
debugger then just ignore everything I have said.


On 20/04/2009, at 4:30 PM, Phil Dokas wrote:

Hello all, I'm writing my first iPhone application and I've run into  
a problem I can't seem to get a grasp on.


In short I want to parse an XML file and display a UITableView with  
data from a set of XML elements. I've got all the code written for  
this but whenever I try to access my array of data inside of - 
tableView:cellForRowAtIndexPath: I crash without an error message in  
console.




Here are the two relevant classes:

@interface PDPagesViewController : UITableViewController {
 NSData* received_data;
 NSMutableArray* pages;
}
- (void)beginParsing;
@end

@interface PDPage : NSObject {
 NSNumber* page_id;
 NSString* title;
}
@property(nonatomic,retain) NSNumber* page_id;
@property(nonatomic,copy) NSString* title;
-(id)init;
-(id)initWithID:(int)in_id andTitle:(NSString*)in_title;
@end



I init my PDPagesViewController as follows:

- (id)init {
 if (self = [super init]) {
   pages = [[NSMutableArray alloc] init];
   [self beginParsing];
 }
 return self;
}

I construct my NSURLRequest and setup my parser inside of  
beginParsing. Here is the delegate method which then builds my array:


- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
 namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName
   attributes:(NSDictionary *)attributeDict
{
 // Handle page elements
 if ([elementName isEqualToString:@page]) {
   NSString *titleAttr = [attributeDict objectForKey:@title];
   NSString *idAttr = [attributeDict objectForKey:@id];
   if (titleAttr  idAttr) {
 PDPage* newPage = [[PDPage alloc] initWithID:[idAttr intValue]  
andTitle:titleAttr];

 [pages addObject:newPage];
 [newPage release];
   }
   return;
 }
}

Insofar as I can tell, everything is ok so far. The problem occurs  
in this table delegate method (again, part of  
PDPagesViewController), with crashing lines and received output  
listed in comments:


- (UITableViewCell *)tableView:(UITableView *)tableView  
cellForRowAtIndexPath:(NSIndexPath *)indexPath

{
 static NSString *CellIdentifier = @Cell;

 UITableViewCell *cell = [tableView  
dequeueReusableCellWithIdentifier:CellIdentifier];

 if (cell == nil) {
   cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero  
reuseIdentifier:CellIdentifier] autorelease];

 }

 // Set up the cell...
 NSLog(@Setting up table cell %d, [indexPath row]);  // Setting  
up table cell: 8
 NSLog(@retain count: %d, [pages retainCount]);  // retain count:  
1

 NSLog(@array count: %d, [pages count]);  // array count: 16
 NSLog(@page retain count: %d, [(PDPage*)[pages objectAtIndex: 
[indexPath row]] retainCount]);  // page retain count: 1
 NSLog(@title: %@, [(PDPage*)[pages objectAtIndex:[indexPath row]]  
title]);  // This line causes a crash
 NSLog(@pages array right now: %@, pages);  // This line causes a  
crash
 cell.text = [[pages objectAtIndex:[indexPath row]] title];  // This  
line causes a crash

 return cell;
}


It seems to me that whenever I try to interact with my  
NSMutableArray as such in this method it crashes, but when I use  
only its NSObject methods it's fine. And yet, it and its contents  
have the right retain count. I feel like I must be missing something  
basic, so any insight would be much appreciated. Thank you!


--
Phil Dokas -//- p...@jetless.org

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Re: Multithreading and Mach ports

[Nathan Day]

NSPort represents both ends of the communication channel you only  
create one NSPort.


On 11/12/2008, at 4:58 AM, John Love wrote:


Reference:

http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/RunLoopManagement/chapter_6_section_5.html#/ 
/apple_ref/doc/uid/1057i-CH16-SW7




While I'm trying to piece your replies together, I have a quick  
question .. reference Listing 5-15 and, in particular, the comment:


// Create and configure the worker thread port.

It appears that the passed (NSPort*)outPort is also the worker, or  
background, thread port.  If true, then are we sending from a  
background port to another background port???


Thanks for this in-between request.

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Re: Countdown With NSTimer - Hours, Minutes, Seconds Remaining?

[Nathan Day]

You need something like

NSLog(@%.2d Hours, %.2d Minutes and %2d Seconds Remaining,
	hoursSelected-seconds/3600, (hoursSelected*60-seconds/60)%60,  
(hoursSelected*3600-seconds)%60 );



On 11/12/2008, at 11:03 , Chunk 1978 wrote:


i believe i painted myself into a corner here... i have a
NSPopUpButton with 3 items.  1 Hour, 2 Hours, 3 Hours.  each item has
respected tag numbers 1, 2 and 3.  i'm attempting to print out time
remaining but i can only get as far as displaying seconds remaining
with this:  NSLog(@%.2d Seconds Remaining, (hoursSelected -
second));  but i would like for the log to output @%.2d Hours, %.2d
Minutes and %2d Seconds Remaining;  i can't wrap my head around it,
and i fear that my trying to be as if/else statementless as possible
by using the tag numbers of the PopUp Menu is causing me problems.

-=-=-=-=-

-(int)timeMenuSelection
{
return [[menu selectedItem] tag];
}

- (IBAction)startTimer:(id)sender
{
startTime = [NSDate timeIntervalSinceReferenceDate];

[killTimer invalidate];
[killTimer release];
killTimer = nil;

killTimer = [[NSTimer scheduledTimerWithTimeInterval:1 target:self
selector:@selector(updateTime:) userInfo:nil repeats:YES] retain];
}

- (void)updateTime:(NSTimer *)theTimer
{
NSTimeInterval now = [NSDate timeIntervalSinceReferenceDate];
NSTimeInterval interval = now - startTime;
int second = (int)interval;

//Tag #1 x 3600 Seconds = 3600 Seconds = 2 Hours.
//Tag #2 x 3600 Seconds = 7200 Seconds = 2 Hours.
//Tag #3 x 3600 Seconds = 10800 Seconds = 3 Hours.

int hoursSelected = ([self timeMenuSelection] * 3600);

if (second = hoursSelected)
{
NSLog(@%.2d Seconds Remaining, (hoursSelected - second));
}
else
{
NSLog(@TIME'S UP!);
[killTimer invalidate];
[killTimer release];
killTimer = nil;
}
}

-=-=-=-=-
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Re: How to use NSWorkspace?

[Nathan Day]

You probable do not have AppKit include into you command line tool  
(under the 'External Frameworks and Libraries' folder) either add it  
to your project or look at LaunchServices which is easy to use, I have  
an example/wrapper on my web site.


On 08/12/2008, at 11:07 , John Velman wrote:



I'm missing something obvious, but I don't know what.

I want to use NSWorkspace to open an application from a command line
Foundation Tool.

When I try to build the simplest thing, I get

--

Undefined symbols:
 .objc_class_name_NSWorkspace, referenced from:
 [EMAIL PROTECTED]@[EMAIL PROTECTED] in LaunchMyMail.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
  .objc_class_name_NSWorkspace, referenced from:
  [EMAIL PROTECTED]@[EMAIL PROTECTED] in LaunchMyMail.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

---

This happens whatever combination of the following imports I use:
#import Foundation/Foundation.h
#import ApplicationServices/ApplicationServices.h
#import cocoa/Cocoa.h
#import AppKit/AppKit.h

This also happens for
 [[NSWorkspace sharedWorkspace] openFile:@SomeFile  
withApplication:@someApp];



Examples I find, don't seem to have any problem, but when I copy  
them onto

my machine, they don't work.


Thanks,

John V.
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Nathan Day
Software Engineer
home:   +61 (0)2 9356 4874
work:   +61 (0)2 8207 8241
mobile: +61 (0)4 3863 2407



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Re: Multithreading and Mach ports

[Nathan Day]

On 10/12/2008, at 07:36 , John Love wrote:


Reference:

http://developer.apple.com/documentation/Cocoa/Conceptual/Multithreading/RunLoopManagement/chapter_6_section_5.html#/ 
/apple_ref/doc/uid/1057i-CH16-SW7


I've got several questions since I'm just starting to investigate  
Mach Ports.


1) Why is +LaunchThreadWithPort: so designated, ie, a class method.   
It seems to me that as far as the specific code listings presented,  
a class method is not required?  For example, [workerObj  
sendCheckinMessage:distantPort] could be replaced with [self  
sendCheckinMessage:distantPort] if LaunchThreadWithPort would be  
changed to an instance method.




2) Maybe the real question #1 is:  What exactly is the object in the  
background thread, named workerObj ??


Class object can be used as any other object, it means they don't have  
to create an instance.
It is the Class/Factory object MyWorkerClass you can treat them the  
same as any other object they are just created automatically for you.
When you send a message you do not disquish between class objects and  
instance objects it is only when defining the class you use the +/-  
syntax to say which object(s) the method is for, the single class  
object or the multiple instance objects.


I don't know if this helps but if you where to implement this kind of  
thing in C, then each class would have two struct definitions one for  
the class object and one for the instances that would contain a  
pointer to the class object.





3) I've saved my most general question to last, at least for this  
trip:  currently when I enter my method to start up my background  
thread or threads, I simply call (several times if I have multiple  
threads:


[NSThread detachNewThreadSelector:@selector(bgCalcThread:)  
toTarget:self withObject:nil]


If I have multiple background threads, I can use a  
NSMutableDictionary with multiple keys for inter-thread communication


As long as you use a lock yes, the point of this example is NSRunLoop  
and using NSPort, doing it this way mean you can have a thread wait  
for to be triggered on mutliple inputs source one of which is data  
through your port you could not do this with just passing data  
directly between two threads and using locks.


One use for this prior to 10.4? is that you could use this to invoke  
methods in the main thread, my NDRunLoopMessager class did this and  
there was another on the net somewhere, there is now an NSObject  
method to do this for you, it probable uses this technique. You could  
not do this with a straight locks very well because you either have to  
use I timer so the runloop can keep polling until there is data for it  
to handle or it waits on a lock until the data is ready, holding up  
the GUI thread.



So, what do Mach Ports give me that the above doesn't?


John Love
Touch the Future! Teach!



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Re: Design patterns: MVC, MVP, Passive View... where is Apple heading???

[Nathan Day]

I have seen that version of the MVC pattern a lot where the View and  
Model are directly connected sometimes only one way, never really  
understood how it was supposed to work, my understanding is that with  
cocoa the model and view where never directly connected to each and it  
was the purpose of the controller classes act as an interface between  
the two, I guess the controller acts as a presenter and a controller.


On 10/12/2008, at 00:36 , Karan, Cem (Civ, ARL/CISD) wrote:

To lay the groundwork for this question, I'm going to state that I'm  
getting my definitions for MVC, MVP, and Passive View from the  
following:


http://en.wikipedia.org/wiki/Model-view-controller
http://en.wikipedia.org/wiki/Model_View_Presenter
http://www.martinfowler.com/eaaDev/PassiveScreen.html

Apple has always stated that it uses the MVC design pattern, but I  
noticed in OS X 10.5 we've gotten NSViewController, KVO, bindings,  
etc.,  objects that seem to behave more like the Passive View design  
pattern.  Is this where Apple wants us to head?  I want to plan out  
my code in a manner that plays as well as possible with Apple's  
chosen design patterns, which is why I want to know where Apple is  
headed.


Thanks,
Cem Karan
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Re: Asynchronous timers (without a run loop)

[Nathan Day]

NSRunLoop use to be based on the function select() (it was in GnuStep  
anyway), it waits for inputs but also has a single timeout value also,  
NSRunLoop works out how long the timeout value should be for the  
shortest NSTimer. If you want to wait on multiple timers without using  
run NSRunLoop then you will have to implement this kind of  
functionality yourself. You can then just use sleep() to make your  
thread wait.


On 04/12/2008, at 9:32 PM, Påhl Melin wrote:


I need to use timers in a low level library where I need to specify
asynchronous callbacks to a timer function. I will not have any run
loop so I cannot use NSTimer. Are there any low level timer API to use
instead? I haven't found anything useful (yet) on google nor ADC. I
assume there must exist some Mach or BSD level API:s that can be used?

Any suggestions?

/ Påhl
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Re: How To Deal With Rounding Errors

[Nathan Day]

The way floats work the round will always be to the same number of  
bits no matter what the order of magnitude (ignoring the extreme  
values  2^-1023 for doubles). Check that you haven't let any integers  
into you calculations.


On 04/12/2008, at 7:08 PM, Bridger Maxwell wrote:


Hey,
Short version of my question: I believe I am having rounding errors  
because
I am working with really, really small values. Would it help if I  
multiplied
these values by a scalar (say, 1,000), did math with them, and then  
divided
them by the scalar? I remember learning how IEEE floating point  
numbers are
stored, but I can't remember enough about it to know if this would  
have any
effect on precision. If not, what is a good way to get better  
precision? I

am already using doubles instead of floats.


Long explanation of my question:
In my project, I have users clicking and dragging to adjust values.  
I would

like to map values from the left-most of the view being zero, and the
right-most of the view to be one. This is fairly simple. However, it  
feels a
little unnatural if the value initially jumps to match where the  
mouse
clicks before dragging. For example, if the initial value is 0.3,  
and they
click in the middle of the view, the value jumps to 0.5. To take  
care of
this I construct a polynomial which maps 0 to 0, the right-most of  
the view
to 1, and the initial click location (middle) to the initial value  
(0.3).
This works very well, and feels natural. However, when any of the  
values
near the edges (the user clicks just off the left of the view), the  
values
go crazy. I believe this is because of a rounding error. The same  
question
still stands, would multiplying (and later dividing) everything by a  
scalar

help me get greater precision?

Thank You,
Bridger Maxwell
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Re: self = [super init];

[Nathan Day]

Usually self does not change, when the instance returned is different  
to the initially self then it is because the super init has decided  
that the initial self is not what it whats so it releases the  
initially self and returns a different object.


This can happen for singltons or cluster object or perhaps in a  
suation where the object represents some resource and if there is  
already an object for that resource the new instance is released and a  
retained version of the original instance is returned in its place.


On 04/12/2008, at 06:14 , EVS wrote:


self = [super init];

Why does the above  line of code not cause a memory leak or memory  
fault?


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Re: Correct location to store application data.

[Nathan Day]

If the data in the dictionary is simple you could perhaps look at  
NSUserDefaults, you could use your dictionary file to initialise  
NSUserDefaults, alternatively you could create a separate file in  
preferences. Be warned that you can only stick property list types in  
NSUserDefaults.



On 03/12/2008, at 21:20 , Jacob Rhoden wrote:

I have an application which contains a dictionary file of sorts.  
Users can add/alter/and remove entries from a dictionary. I assume I  
will have the default dictionary stored as part of the application  
bundle somehow, and I should be saving a copy of some sort in a  
second hidden location, ie it doesnt make sense to store it in the  
Documents folder.


Best regards,
Jacob
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Re: Converting from HTML

[Nathan Day]

Try this

http://www.thinkmac.co.uk/blog/2005/05/removing-entities-from-html-in-cocoa.html 



On 17/10/2008, at 13:17 , Drarok Ithaqua wrote:

Hi all, i'm trying to find a way to convert an HTML-originated URL  
into one I can use in cocoa.


Example input: link type=application/rss+xml rel=alternate  
href=/search/uniqueamp;stuffamp;here /


I know the URL that this data is fetched from, so I can prefix that  
to achieve a full URL again, but I need to convert the amp;
into plain ampersands, but there could be all kinds of HTML  
characters in there. Is there a category on NSString out there I could

use for this?

I read somewhere that I could use an NSAttributedString and  
initWithHTML, but that leaves me with an empty string. I'm guessing  
because it's

inside a head tag? Not sure.

I'm also open to using something more intelligent than my current  
method of searching the string for link  to find the rss feed, if  
there's perhaps an
easier way that would also convert the HTML characters for me. Maybe  
webkit has something for me?


I look forward to your replies, and you have my thanks in advance.

- Drarok
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Nathan Day
[EMAIL PROTECTED]
http://homepage.mac.com/nathan_day/

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Re: Objective 2.0 properties

[Nathan Day]

And because they are immutable types, if they are mutable then retain  
is probable the appropriate behaviour. Copy will become retain for  
truly immutable objects and if you get a subclass that is mutable then  
you don't want that changing under you so copy gives you a new  
immutable version.


Assign really is not the right thing to do in this situation, what is  
to stop lessonDuration from disappearing underneath you. If you are  
trying to stop circular retains then assign is what you use, for  
example a container object retains its children, the children should  
not retain the parent.


On 17/10/2008, at 14:02 , Charles Steinman wrote:


@property (nonatomic, retain) NSString* lessonTitle;
@property (nonatomic, retain) NSDate *referDate;
@property (assign) NSNumber * lessonDuration;


Why is lessonDuration assign? That's begging for a crash. All three  
of these should be copy since the classes all conform to NSCopying.


Nathan Day
[EMAIL PROTECTED]
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