Re: While running our iPhone app, the screen sometimes goes white and locks up. Any idea why?
Good info. Thanks, guys! ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Changing Album Name property of the audio book track, does not affect the title of Audiobook on iOS5 device.
Hi All, I am transferring audiobook from Mac OS X to iOS device using iTunes (during transfer the audiobook is not copied to iTunes). For the transfer I am using apple script (with Cocoa). I found that if the album name of audiobook is not set, after transfer on iOS device (iPhone, iPad..)the audio book is found to be under the title Unknown in 'Audiobooks' section . Before iOS5 i used to set the Album Name property of the tracks on the device to the Audiobook title using apple script. On non iOS5 devices, value for album name property of the track is set as title for Audiobook on device. But for iOS 5 device though the Album Name property is set successfully, the tracks are still with the title Unknown. Then I tried, copy the audiobook to iTunes, set the Album Name property of tracks and then copied these audiobook tracks to the iOS5 device. This time I noticed that the title for same Audiobook was set which was Unknown last time ( when copied the tracks directly to device and then changed the Album Name). Is it like that changing the Album Name property of track on device does not affect? It would be grate to find any help regarding setting title of audiobook on iOS5 device from Unknown to desired value. Thanks DISCLAIMER == This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSOpenPanel problem
On Jan 23, 2012, at 5:17 AM, Ken Thomases wrote:
On Jan 22, 2012, at 1:24 PM, Jan E. Schotsman wrote:
Suppose I want to display a modeless choose file dialog with the
beginWithCompletionHandler method.
How can I pass some context info to the handler?
Blocks capture whatever local variables you reference within them.
If you reference instance variables, they capture self and then
access the ivars from that. Just use whatever value you want,
directly. That's the great thing about blocks.
That's great indeed, but I need the block to work with a method
parameter (an NSString object). Do I need to copy the NSString to an
ivar?
-method:(NSString *)someString
{
(void)(^handler)(NSInteger result) = { uses someString };
[openPanel beginWithCompletionHandler: handler];
}
I have a related question for the old beginForDirectory method:
if I try to pass on someString in a C struct (contextInfo) then the
compiler complains that ARC doesn't like object pointers in C structs.
I could serialize and unserialize the string. Or is there a better way?
Jan E.
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Re: NSOpenPanel problem
(Re-post on list.) On 1/23/12 1:41 AM, Jan E. Schotsman wrote: That's great indeed, but I need the block to work with a method parameter (an NSString object). Do I need to copy the NSString to an ivar? No, you just use it directly. As Ken mentioned, any variable you reference in a block is automatically captured by the block and remains available for the duration of its existence - even outside the scope of the original variable declaration. (If you need to *write* to an outside variable inside a block, the variable's declaration must include a __block modifier; this and other quirks are noted in the documentation.) You *really* need to read the docs on blocks and GCD since they are the modern way of writing threaded code, implementing callbacks, etc. I'd start with the Short Practical Guide to Blocks - http://developer.apple.com/library/ios/#featuredarticles/Short_Practical_Guide_Blocks/_index.html. There are a plethora of WWDC videos from beginning to advanced on these topics, too. if I try to pass on someString in a C struct (contextInfo) then the compiler complains that ARC doesn't like object pointers in C structs. I could serialize and unserialize the string. Or is there a better way? Just use the NSString * right in the block - no need for structs, serialization, or anything. That's why blocks are so useful. -- Conrad Shultz Synthetiq Solutions www.synthetiqsolutions.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Cocoa-dev Digest, Vol 9, Issue 39
Re: Versions, -windowWillClose: (Martin Hewitson) 2. Re: NSSlider and arrangedObjects (Ken Thomases) 3. Re: NSXMLParser, streams, multiple threads, and crashing (Jens Alfke) 4. Re: NSXMLParser, streams, multiple threads, and crashing (Thomas Davie) 5. Re: NSTextView : Scroll top when bound-to string changes (Ken Thomases) 6. Re: While running our iPhone app,the screen sometimes goes white and locks up. Any idea why? (Greg Parker) 7. NSOpenPanel problem (Jan E. Schotsman) 8. Re: NSOpenPanel problem (Ken Thomases) 9. Re: Cocoa-dev Digest, Vol 9, Issue 38 (lpeng...@gmail.com) 10. Re: While running our iPhone app,the screen sometimes goes white and locks up. Any idea why? (G S) 11. Changing Album Name property of the audio book track,does Jim Lin 在 2012-1-23，17:18，cocoa-dev-requ...@lists.apple.com 写道： Re: Versions, -windowWillClose: (Martin Hewitson) 2. Re: NSSlider and arrangedObjects (Ken Thomases) 3. Re: NSXMLParser, streams, multiple threads, and crashing (Jens Alfke) 4. Re: NSXMLParser, streams, multiple threads, and crashing (Thomas Davie) 5. Re: NSTextView : Scroll top when bound-to string changes (Ken Thomases) 6. Re: While running our iPhone app,the screen sometimes goes white and locks up. Any idea why? (Greg Parker) 7. NSOpenPanel problem (Jan E. Schotsman) 8. Re: NSOpenPanel problem (Ken Thomases) 9. Re: Cocoa-dev Digest, Vol 9, Issue 38 (lpeng...@gmail.com) 10. Re: While running our iPhone app,the screen sometimes goes white and locks up. Any idea why? (G S) 11. Changing Album Name property of the audio book track,does ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSOpenPanel problem
On Jan 23, 2012, at 11:37 AM, Conrad Shultz wrote: You *really* need to read the docs on blocks and GCD since they are the modern way of writing threaded code, implementing callbacks, etc. I'd start with the Short Practical Guide to Blocks - http://developer.apple.com/library/ios/#featuredarticles/ Short_Practical_Guide_Blocks/_index.html. OK, will do that. if I try to pass on someString in a C struct (contextInfo) then the compiler complains that ARC doesn't like object pointers in C structs. I could serialize and unserialize the string. Or is there a better way? Just use the NSString * right in the block - no need for structs, serialization, or anything. That's why blocks are so useful. I still need an alternative because I want to support Leopard where blocks aren't available. I've written some code using NSPropertyListSerialization which should do the trick. Jan E. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSOpenPanel problem
On Jan 23, 2012, at 9:16 AM, Jan E. Schotsman wrote: On Jan 23, 2012, at 11:37 AM, Conrad Shultz wrote: if I try to pass on someString in a C struct (contextInfo) then the compiler complains that ARC doesn't like object pointers in C structs. I could serialize and unserialize the string. Or is there a better way? Just use the NSString * right in the block - no need for structs, serialization, or anything. That's why blocks are so useful. I still need an alternative because I want to support Leopard where blocks aren't available. I've written some code using NSPropertyListSerialization which should do the trick. If you're supporting Leopard, then you can't use ARC and the original problem goes away. Also, serializing a string doesn't help because you still have a Cocoa object -- an NSData now instead of an NSString -- and you have to manage its memory just the same. Regards, Ken ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSOpenPanel problem
On Jan 23, 2012, at 5:08 PM, Ken Thomases wrote: If you're supporting Leopard, then you can't use ARC and the original problem goes away. ??? I have set development target = 10.7 SDK, deployment target = 10.5 and ARC is on. The compiler doesn't complain. I have clicked the validate settings button and no problems are reported. Latest Mac OS, latest Xcode. Also, serializing a string doesn't help because you still have a Cocoa object -- an NSData now instead of an NSString -- and you have to manage its memory just the same. That's what [data getBytes:length:] is for. Jan E. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
What causes a UITableViewCell to be deallocated?
Hello.
I'm trying to track a crash in our app where we have a custom UITableView cell
that contains a UITextView because we need the ability to display and open
links that might be in the text we're displaying in the text view.
The problem is that somehow, the cell is deallocated and WebKit complains that
it's been unable to obtain the web lock from a thread other than the main
thread or the web thread when it's deallocated. I have reviewed the code and
checked all the reload… message we might send to the table view that could
cause the deallocation of its cells but all of those calls are executed from
the main thread using [[NSOperationQueue mainQueue] addOperationWithBlock:^{…}]
so I'm stumped. Are there any other situations where UITableView cells would be
deallocated? The view displays and the view isn't unloaded due to memory
warning or any other situation.
-Laurent.
--
Laurent Daudelin
AIM/iChat/Skype:LaurentDaudelin
http://www.nemesys-soft.com/
Logiciels Nemesys Software
laur...@nemesys-soft.com
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vForce Performance
I recently posted a query on the Xcode-Users list but with no reply so far. I hopes of accelerating some standard C functions, I've run a few timing experiments to assess vForce.h function performance. The results are disappointing. - Comparing the time to run vvsqrt( ) on a 1 point data file to a simple for( ) loop, i.e., for( ii=0; ii1; ii++ ) yy[ii] = sqrt[ii] , shows a very slight improvement ( ~23 nsec per input data pt. for vvsqrt vice ~24 nsec for the loop), - Comparing the time to run vvsin( ) in similar fashion actually shows the loop to be better-- ( ~39 nsec per data pt. for vvsin vice ~21 nsec for the loop). (FYI, tests were run under Xcode 3.2.3 on a MacPro w Dual-Core, 3 GHz Xeon processor.) My questions are: - Are these timing results consistent with expected vForce performance? - If not, what does one need to do to get the expected performance? - And, regardless, are there other considerations that would favor use of the vForce functions? Don Thompson ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSOpenPanel problem
On Jan 23, 2012, at 12:22 PM, Jan E. Schotsman wrote: On Jan 23, 2012, at 5:08 PM, Ken Thomases wrote: If you're supporting Leopard, then you can't use ARC and the original problem goes away. ??? I have set development target = 10.7 SDK, deployment target = 10.5 and ARC is on. The compiler doesn't complain. I have clicked the validate settings button and no problems are reported. Latest Mac OS, latest Xcode. I don't know about complaints from the compiler, but I'm certain that ARC can't be used with code deployed to Leopard. ARC requires support from the runtime libraries and that support was never released for Leopard. For example, the Transitioning to ARC Release Notes say, ARC is supported in Xcode 4.2 for Mac OS X v10.6 and v10.7 (64-bit applications). http://developer.apple.com/library/mac/#releasenotes/ObjectiveC/RN-TransitioningToARC/_index.html Also, serializing a string doesn't help because you still have a Cocoa object -- an NSData now instead of an NSString -- and you have to manage its memory just the same. That's what [data getBytes:length:] is for. I can't imagine that allocating a heap buffer for a serialized string is the best way to get data into the handler. If you are using ARC (which I believe you can't), then try CFBridgingRetain() balanced later with a CFRelease() or CFBridgingRelease(). Regards, Ken ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: What causes a UITableViewCell to be deallocated?
Think about it simply. A cell gets deallocated just like any other object -
when its retain count goes to zero. If you're looking for a cell getting
deallocated on a non-main thread, you're looking for a place release is being
called on a non-main thread. I would think you could just override the dealloc
method to help you track this situation in the debugger. Perhaps add an
NSAssert([NSThread isMainThread], @wups); in there.
Luke
On Jan 23, 2012, at 11:38 AM, Laurent Daudelin wrote:
Hello.
I'm trying to track a crash in our app where we have a custom UITableView
cell that contains a UITextView because we need the ability to display and
open links that might be in the text we're displaying in the text view.
The problem is that somehow, the cell is deallocated and WebKit complains
that it's been unable to obtain the web lock from a thread other than the
main thread or the web thread when it's deallocated. I have reviewed the code
and checked all the reload… message we might send to the table view that
could cause the deallocation of its cells but all of those calls are executed
from the main thread using [[NSOperationQueue mainQueue]
addOperationWithBlock:^{…}] so I'm stumped. Are there any other situations
where UITableView cells would be deallocated? The view displays and the view
isn't unloaded due to memory warning or any other situation.
-Laurent.
--
Laurent Daudelin
AIM/iChat/Skype:LaurentDaudelin
http://www.nemesys-soft.com/
Logiciels Nemesys Software
laur...@nemesys-soft.com
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Re: What causes a UITableViewCell to be deallocated?
It seems that the deallocation happens when a block is being deallocated. Is it
possible that a block ran on the main queue of an NSOperationQueue could be
deallocated in another thread?
-Laurent.
--
Laurent Daudelin
AIM/iChat/Skype:LaurentDaudelin
http://www.nemesys-soft.com/
Logiciels Nemesys Software
laur...@nemesys-soft.com
On Jan 23, 2012, at 13:49, Laurent Daudelin wrote:
Hello Luke.
Well, I already checked that. The cell is being deallocated from a secondary
thread but there is nothing in the thread that indicates what triggered it.
It looks like a performSelector:withObject:afterDelay: or something like it
but we don't have any of those in the table view controller that controls the
table view. Like I said in my original message, I've looked for any flavor of
UITableView reload… and the only calls we have are reloadData but they are
all executed on the main thread using [[NSOperationQueue] mainQueue]
addOperationWithBlock: so I'm stumped as to where this deallocation is
triggered. I've checked all the other running threads and I can't find any
code that you reload the table view which could cause its cells to be
deallocated.
-Laurent.
--
Laurent Daudelin
AIM/iChat/Skype:LaurentDaudelin
http://www.nemesys-soft.com/
Logiciels Nemesys Software
laur...@nemesys-soft.com
On Jan 23, 2012, at 13:38, Luke Hiesterman wrote:
Think about it simply. A cell gets deallocated just like any other object -
when its retain count goes to zero. If you're looking for a cell getting
deallocated on a non-main thread, you're looking for a place release is
being called on a non-main thread. I would think you could just override the
dealloc method to help you track this situation in the debugger. Perhaps add
an NSAssert([NSThread isMainThread], @wups); in there.
Luke
On Jan 23, 2012, at 11:38 AM, Laurent Daudelin wrote:
Hello.
I'm trying to track a crash in our app where we have a custom UITableView
cell that contains a UITextView because we need the ability to display and
open links that might be in the text we're displaying in the text view.
The problem is that somehow, the cell is deallocated and WebKit complains
that it's been unable to obtain the web lock from a thread other than the
main thread or the web thread when it's deallocated. I have reviewed the
code and checked all the reload… message we might send to the table view
that could cause the deallocation of its cells but all of those calls are
executed from the main thread using [[NSOperationQueue mainQueue]
addOperationWithBlock:^{…}] so I'm stumped. Are there any other situations
where UITableView cells would be deallocated? The view displays and the
view isn't unloaded due to memory warning or any other situation.
-Laurent.
--
Laurent Daudelin
AIM/iChat/Skype:LaurentDaudelin
http://www.nemesys-soft.com/
Logiciels Nemesys Software
laur...@nemesys-soft.com
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Re: What causes a UITableViewCell to be deallocated?
A UITableViewCell could be deallocated as soon as its row scrolls out of view.
UITableView will reuse cells if you specify a reuse identifier, but I don't
believe that the docs actually specify the number of cells that are reused.
I'm assuming that the web view is displayed when the user taps a link in the
UITextView. If so, when does the crash occur relative to the appearance of the
web view?
On Jan 23, 2012, at 11:38 AM, Laurent Daudelin wrote:
I'm trying to track a crash in our app where we have a custom UITableView
cell that contains a UITextView because we need the ability to display and
open links that might be in the text we're displaying in the text view.
The problem is that somehow, the cell is deallocated and WebKit complains
that it's been unable to obtain the web lock from a thread other than the
main thread or the web thread when it's deallocated. I have reviewed the code
and checked all the reload… message we might send to the table view that
could cause the deallocation of its cells but all of those calls are executed
from the main thread using [[NSOperationQueue mainQueue]
addOperationWithBlock:^{…}] so I'm stumped. Are there any other situations
where UITableView cells would be deallocated? The view displays and the view
isn't unloaded due to memory warning or any other situation.
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Re: What causes a UITableViewCell to be deallocated?
Steve,
There are no web views. Because we're using a UITextView, it loads the WebKit
behind the scene (I guess to support links that could appear in the text in the
UITextView) and when that UITextView is deallocated from another thread than
the main thread or the webkit thread, it raises an exception that crashes the
app. This happens only in iOS 4.3.5. I'm not sure if all my UITableView
operations are run on the main thread why when that block is deallocated, it
would be on a secondary thread. That seems to be the problem.
-Laurent.
--
Laurent Daudelin
AIM/iChat/Skype:LaurentDaudelin
http://www.nemesys-soft.com/
Logiciels Nemesys Software
laur...@nemesys-soft.com
On Jan 23, 2012, at 15:49, Steve Christensen wrote:
A UITableViewCell could be deallocated as soon as its row scrolls out of
view. UITableView will reuse cells if you specify a reuse identifier, but I
don't believe that the docs actually specify the number of cells that are
reused.
I'm assuming that the web view is displayed when the user taps a link in the
UITextView. If so, when does the crash occur relative to the appearance of
the web view?
On Jan 23, 2012, at 11:38 AM, Laurent Daudelin wrote:
I'm trying to track a crash in our app where we have a custom UITableView
cell that contains a UITextView because we need the ability to display and
open links that might be in the text we're displaying in the text view.
The problem is that somehow, the cell is deallocated and WebKit complains
that it's been unable to obtain the web lock from a thread other than the
main thread or the web thread when it's deallocated. I have reviewed the
code and checked all the reload… message we might send to the table view
that could cause the deallocation of its cells but all of those calls are
executed from the main thread using [[NSOperationQueue mainQueue]
addOperationWithBlock:^{…}] so I'm stumped. Are there any other situations
where UITableView cells would be deallocated? The view displays and the view
isn't unloaded due to memory warning or any other situation.
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