Re: TableView crash with Delegate

[Gerriet M. Denkmann]

> On 13 Jun 2016, at 21:43, Alastair Houghton  
> wrote:
> 
> On 12 Jun 2016, at 10:10, Gerriet M. Denkmann  wrote:
>> 
>> OS X 10.11.5, Xcode Version 7.3.1 (7D1014).
>> 
>> App with TableView (View based). Works fine. 
>> But when I give the TableView a delegate (even without implementing any 
>> NSTableViewDelegate methods) it crashes (see below).
>> 
>> How to debug this?
>> Tried a symbolic breakpoint in  -[__NSArrayM objectAtIndex:] - but it 
>> crashes before reaching breakpoint.
> 
> Set it to break on exceptions (or put a breakpoint on objc_exception_throw), 
> then go back up the call stack?

This ultimately let me to the root of the problem:

My app has only one TableView, which is bound to Array Controller.
Array Controller binds its Content Array to AppDelegate with Model Key Path 
self.someUniqueObject.aMutableArray.
When the app starts a unique someUniqueObject gets created.

But I had:
- (void)awakeFromNib 
{
self.someUniqueObject = [ [ UniqueObject alloc ] init ];
}

The problem: awakeFromNib gets called twice: once before 
applicationDidFinishLaunching:, once after.
This obviously created a total mess.

Solution: move the creation of someUniqueObject to 
applicationDidFinishLaunching:


Thanks for your help!

Kind regards,

Gerriet.


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Re: KERN_INVALID_ADDRESS

[Jens Alfke]

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Re: Tick marks on scroll bars

[Jens Alfke]

> On Jun 13, 2016, at 9:18 AM, じょいすじょん  
> wrote:
> 
> Did you do run into any issues with rubberbanding and responsive/momentum 
> scrolling?

Why would I? I just overrode the method that draws the background.

—Jens
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Re: KERN_INVALID_ADDRESS

[Raglan T. Tiger]

Or , how can an address held in a variable be checked for validity?

-rags



> On Jun 13, 2016, at 1:08 PM, Raglan T. Tiger  wrote:
> 
> 
> How can one find the variable containing the KERN_INVALID_ADDRESS s indicated 
> by
> 
> Exception Codes:   KERN_INVALID_ADDRESS at 0x01a9
> 
> from a crash report?
> 
> -rags
> 
> 
> 
> 
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KERN_INVALID_ADDRESS

[Raglan T. Tiger]

How can one find the variable containing the KERN_INVALID_ADDRESS s indicated by

Exception Codes:   KERN_INVALID_ADDRESS at 0x01a9

from a crash report?

-rags




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Re: Tick marks on scroll bars

[じょいすじょん]

Did you do run into any issues with rubberbanding and responsive/momentum 
scrolling?

> On Jun 14, 2016, at 1:03 AM, Jens Alfke  wrote:
> 
> I've done it by subclassing NSScroller. (The code's not open-source, though.)
> As far as I know, that's the only way to do it. It's fairly easy.
> 
> —Jens
> 
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Re: Tick marks on scroll bars

[Jens Alfke]

I've done it by subclassing NSScroller. (The code's not open-source, though.)
As far as I know, that's the only way to do it. It's fairly easy.

—Jens

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Re: TableView crash with Delegate

[Alastair Houghton]

On 12 Jun 2016, at 10:10, Gerriet M. Denkmann  wrote:
> 
> OS X 10.11.5, Xcode Version 7.3.1 (7D1014).
> 
> App with TableView (View based). Works fine. 
> But when I give the TableView a delegate (even without implementing any 
> NSTableViewDelegate methods) it crashes (see below).
> 
> How to debug this?
> Tried a symbolic breakpoint in  -[__NSArrayM objectAtIndex:] - but it crashes 
> before reaching breakpoint.

Set it to break on exceptions (or put a breakpoint on objc_exception_throw), 
then go back up the call stack?

Alternatively, if that isn’t helpful (and it might well not be), I’d start 
looking to see whether I was doing anything I shouldn’t; for instance, changing 
the number of items in the table view from a data source or delegate method 
where doing that isn't safe.  Not sure how much of that is documented; some of 
it might be assumed to be “obvious”.  Pretty sure I’ve crashed NSTableView 
before that way, and with an index beyond bounds error at that.

Kind regards,

Alastair.

--
http://alastairs-place.net
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CGWindowList Documentation bug?

[Dave]

Hi All,

I got this from CGWindow Reference manual:

Window List Option Constants
Specifies which windows in the current user session to include in a generated 
list.

enum
{
   
kCGWindowListOptionAll
 = 0,
   
kCGWindowListOptionOnScreenOnly
= (1 << 0),
   
kCGWindowListOptionOnScreenAboveWindow
 = (1 << 1),
   
kCGWindowListOptionOnScreenBelowWindow
 = (1 << 2),
   
kCGWindowListOptionIncludingWindow
 = (1 << 3),
   
kCGWindowListExcludeDesktopElements
= (1 << 4)
}

Constants
kCGWindowListOptionAll
List all windows, including both onscreen and offscreen windows. When 
retrieving a list with this option, the relativeToWindow parameter should be 
set to kCGNullWindowID.
kCGWindowListOptionOnScreenOnly
List all windows that are currently onscreen. Windows are returned in order 
from front to back. When retrieving a list with this option, the 
relativeToWindow parameter should be set to kCGNullWindowID.
kCGWindowListOptionOnScreenAboveWindow
List all windows that are currently onscreen and in front of the window 
specified in the relativeToWindow parameter. Windows are returned in order from 
front to back. 
kCGWindowListOptionOnScreenBelowWindow
List all windows that are currently onscreen and in behind the window specified 
in the relativeToWindow parameter. Windows are returned in order from front to 
back. 
kCGWindowListOptionIncludingWindow
Include the specified window (from the relativeToWindow parameter) in the 
returned list. You must combine this option with the 
kCGWindowListOptionOnScreenAboveWindow or 
kCGWindowListOptionOnScreenBelowWindow option to retrieve meaningful results. 
kCGWindowListExcludeDesktopElements
Exclude any windows from the list that are elements of the desktop, including 
the background picture and desktop icons. You may combine this option with the 
other options. 
Discussion
The kCGWindowListOptionIncludingWindow and kCGWindowListExcludeDesktopElements 
constants may be combined with the other constants by adding (or ORing) them 
together and passing the resulting value to the appropriate function.
These constants let you retrieve windows in the current user session only. You 
cannot use them to retrieve windows from other active user sessions running on 
the system. 

Note this:

kCGWindowListOptionIncludingWindow
Include the specified window (from the relativeToWindow parameter) in the 
returned list. You must combine this option with the 
kCGWindowListOptionOnScreenAboveWindow or 
kCGWindowListOptionOnScreenBelowWindow option to retrieve meaningful results. 

Reading the above led me to believe that I had to specify 
kCGWindowListOptionOnScreenAboveWindow or 
kCGWindowListOptionOnScreenBelowWindow in order to retrieve the *one* window I 
was interested in. From experimenting it seems that THIS IS NOT THE CASE, as:

myWindowListOptions = kCGWindowListExcludeDesktopElements | 
kCGWindowListOptionIncludingWindow;
myWindowArray = (NSArray*) 
CFBridgingRelease(CGWindowListCopyWindowInfo(myWindowListOptions,theWindowID));
myWindowInfoDictionary = [myWindowArray lastObject];

Returns the *ONE* info dictionary for the *ONE* window specified by 
“theWindowID”. 

I’ve tested this and it works on 10.10.5 and 10.11 and it works ok. Is this a 
Bug in the documentation? I’m wondering if I should rely on this, if not I’m at 
a loss how to retrieve the Info for the one window I want? When I include the 
Above or Below option, it returns a while load of window info dictionaries I 
don’t care about and this is enough to slow it down so as to cause a 
“juddering” effect.

Any suggestions or help on the would be greatly appreciated.

All the Best
Dave




















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Tick marks on scroll bars

[Jonathan Taylor]

Hi all,

Does anyone know a way of implementing "tick marks" on a scroll bar, in the way 
that Xcode does to mark code lines where there is an error/warning? From 
reading header files, I can't see any obvious built-in API to implement this 
feature, but perhaps somebody knows of a custom class that somebody has written 
to implement this functionality? It's something I would like to use, and would 
do if it was comparatively simple to do so, but it's not crucial enough that it 
would be worth my time to write a custom subclass from scratch to do it I 
suspect (I have no experience of customizing controls, even if to an expert it 
might be comparatively simple!).

Thanks for any suggestions...
Jonny
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