Question about power surges and stuff like that.
Ok so I have a question so… Today i was at home and i had a lot of stuff on by on i want to say that i had a lot of electronics using power and my fuze went off buy went off i mean it like shut off some of the electronics and my iMac was in Sleep mode and i was wondering if any damage was inflicted to my iMac everything is running good on it right now I'm using it but i just want to be shire I'm not an expert by any means.
Thanks for your time.
And also Happy Holidays
If that, or other power problems, happen very often, consider geting a U.P.S. (Uninterruptible Power Supply, aka Battery Backup) for your Mac. You can now get ones that will run your Mac for several minutes for $80 or so.
See Using a U.P.S. System with a Mac.
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Hi Jillianfromny!
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Questions about Objects, pointers, and the memory that loves them
Hey,
This is all just a theoretical discussion so do understand that the code itself is not germane to the topic.
I have been mulling over the whole object release/retain/copy thing and need to understand a bit more the real inner workings of the beast. The catalyst for this is the repetitional fervor that most books on the subject of Objective C have employed. Yet they all seem to fail in a complete explanation of the whys and wherefores so that one can determine on her own the correct implementation of this.
Let's say I have an Object. For the fun of it it is an instance of NSObject and we'll call it myObject.
When I "create" this object thusly:
NSObject *myObject = [[NSObject alloc] init];
What I, in fact get back is a pointer to the object in question, yes?
So when I "seemingly" add this object to an array like:
NSArray *myArray = [[NSArray alloc] initWithObject:myObject];
What is actually placed in the array? is it another pointer to the original object created by myObject or is it a pointer to the pointer of myObject?
The reason I ask this is because I have run into a situation where some previous instructions on the subject have caused errors. I was told that if I did something like this and then passed the array to a calling method that I could release this array and it would then be the responsibility of the calling method to handle the memory. Further more if I place an object into an array and then copy it into another object of the same type as the original then I could release the array and still have the reference to the first object in the second object. When I have done this I get unpredictable results, sometimes the original object is there and sometimes it isn't
At what point should I release the array, after it is passed to the calling method (with the use of an autorelease) or when the class that it is encapsulated in is done?
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MMetresoft,
Thanks for the detailed reply. I wish I could say that I wasn't still a bit confused by this. I thought I had this down after going through the lessons. It seems to not be working in practice the way that it works in theory.
My current project is an example
In a class I have declared a couple of ivars thusly:
NSMutableString *source;
NSMutableString *destination;
@property (nonatomic, retain) NSMutableString *source;
@property (nonatomic, retain) NSMutableString *destination;
This is followed by the appropriate @synthesize directives.
in the init method for my class I have the following:
source = [[NSMutableString alloc] initWithString:@"customer"];
destination = [[NSMutableString alloc] initWithString:@"home"];
in a method triggered by a button click I have the following:
if (sender == sourcePop){
source = [sourcePop titleOfSelectedItem];
}else{
destination = [destinationPop titleOfSelectedItem];
NSLog(@"SOURCE-%@", source);
NSLog(@"DESTINATION-%@", destination);
When I run the code and change the source selection the console reads the correct value for what is in the source popupbutton and "home" for the destination. If I then change the destination popupbutton I get a crash and nothing written to the console.
Placing a breakpoint at the beginning of the "if" and running shows me that just before the crash the source ivar is reported as "out of scope." There are no release or autorelease statements for this ivar anywhere in the class. Yet if I change the line that sets the ivar to the value of the popupbutton to this:
[source = [sourcePop titleOfSelectedItem] retain];
The debugger will have the correct value for the ivar and when run normally there is no crash.
I would assume that the problem is that the ivar is being released but I am not the one releasing it. Why does this behavior happen? Shouldn't the retain count still be 1 since the @property directive has it and there is no release in the code? Or is it that the statement that sets the ivar to the value of the popup really just setting it to the pointer and it is the popup that is somehow being released?
Is there something else that I should be doing?
MM -
I think that apple should make their ios devices customizable like a jailbroken one. For an example, users could be able to change themes, or change what kind of passcode they have.
Yes, this is a very wide debate, but there are many reasons why apple doesn't do that aswell. Apple does its best to match the ios to its hardware and you can only have that many features on your device before it crashes down. Jail broken devices currently use cydia, and that a very open source that lets nearly anyone post a lot of things that could be bad for your device, if apple had some sort of built in software like that, they would have to fix every problem that comes up which would cost the way too much money. That's why jail breaking your device voids it's warranty.
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Make an appointment at the Genius Bar of an Apple store..
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Hello Greg.
You can uninstall unwanted extensions by going into Tools > Add-ons > Extensions.
You can select which toolbars to see by going into View > Toolbars. Also, you can reset your interface by going into View > Toolbars > Customize... > Restore default set. -
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Also works on older used Mac's running OS X 10.6
https://www.adobe.com/downloads/cs2_downloads/index.html
If it's right for you then by all means pull the trigger on the new MacBook Pro and buy CS6. -
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Process: Disk Utility [371]
Path: /Applications/Utilities/Disk Utility.app/Contents/MacOS/Disk Utility
Identifier: com.apple.DiskUtility
Version: 11.5.2 (298.4)
Build Info: DiskUtility-2980400~60
Code Type: X86-64 (Native)
Parent Process: launchd [86]
Date/Time: 2013-11-05 03:29:41.247 -0500
OS Version: Mac OS X 10.6.8 (10K549)
Report Version: 6
Interval Since Last Report: 9522 sec
Crashes Since Last Report: 29
Per-App Interval Since Last Report: 981 sec
Per-App Crashes Since Last Report: 25
Anonymous UUID: F6B8E263-76C8-4C7D-AA58-48134BF4BA78
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
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Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
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2 libobjc.A.dylib 0x0000000100c62761 map_images + 115
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5 dyld 0x00007fff5fc04d54 dyld::link(ImageLoader*, bool, ImageLoader::RPathChain const&) + 118
6 dyld 0x00007fff5fc08f7c dlopen + 490
7 libSystem.B.dylib 0x0000000100a14e40 dlopen + 61
8 com.apple.CoreFoundation 0x0000000100d78ef7 _CFBundleDlfcnLoadBundle + 231
9 com.apple.CoreFoundation 0x0000000100d77e97 _CFBundleLoadExecutableAndReturnError + 1191
10 com.apple.Foundation 0x0000000101008355 _NSBundleLoadCode + 638
11 com.apple.Foundation 0x0000000101007c78 -[NSBundle loadAndReturnError:] + 742
12 com.apple.Foundation 0x000000010101960c -[NSBundle principalClass] + 38
13 com.apple.framework.DUSupport 0x0000000100082080 -[DUModuleManager(_private) findDUModules:] + 405
14 com.apple.framework.DUSupport 0x0000000100081ed9 -[DUModuleManager orderedModuleListOfModules] + 40
15 com.apple.DiskUtility 0x0000000100006082 0x100000000 + 24706
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20 com.apple.AppKit 0x00000001015c7c5c -[NSDocument showWindows] + 98
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22 com.apple.AppKit 0x00000001014f7b44 -[NSDocumentController(NSInternal) _openUntitled] + 111
23 com.apple.AppKit 0x00000001014f79ab -[NSApplication _doOpenUntitled] + 257
24 com.apple.AppKit 0x00000001014f733b -[NSApplication(NSAppleEventHandling) _handleAEOpen:] + 185
25 com.apple.AppKit 0x00000001014f6fd9 -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 77
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29 com.apple.AE 0x0000000104d73224 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 32
30 com.apple.AE 0x0000000104d7312b aeProcessAppleEvent + 210
31 com.apple.HIToolbox 0x00000001028a0619 AEProcessAppleEvent + 48
32 com.apple.AppKit 0x00000001013fc095 _DPSNextEvent + 1191
33 com.apple.AppKit 0x00000001013fb801 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155
34 com.apple.AppKit 0x00000001013c168f -[NSApplication run] + 395
35 com.apple.AppKit 0x00000001013ba3b0 NSApplicationMain + 364
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37 com.apple.DiskUtility 0x0000000100001db8 0x100000000 + 7608
Thread 1: Dispatch queue: com.apple.libdispatch-manager
0 libSystem.B.dylib 0x0000000100a27c0a kevent + 10
1 libSystem.B.dylib 0x0000000100a29add _dispatch_mgr_invoke + 154
2 libSystem.B.dylib 0x0000000100a297b4 _dispatch_queue_invoke + 185
3 libSystem.B.dylib 0x0000000100a292de _dispatch_worker_thread2 + 252
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AND MORE TOO MUCH TO COPY N PASTE HELP PLEASE!!!!!Reset the PRAM
Reinstall the operating system from the dvd (you will not loose your data) -
A few questions about the ka790gx and dka790gx
i have a few questions about the ka790gx and dka790gx , how much better is the dka790gx compaired to the ka790gx ? . how much difference does the ACC function make to overclocking etc , i plan on getting a phenom II 940BE or 720BE . i already have the ka790gx so would it be worth building another system using the dka790gx mobo , or should i keep what i already have and just change the cpu ?
It's largely irrelevant what other boards had VRM issues other than the KA790GX - the fact is it died at stock settings. Since there is little cost difference between the more robust DKA790GX (or Platinum if you really need 1394) why bother with the proven weakling? There are other examples around of the KA not having a robust power section. There's no way I would use even a 95W TDP CPU in the KA and absolutely not O/C.....!
As for the credentials of Custom PC, I have generally found their reviews accurate and balanced, and echo my own findings where applicable. If a little too infrequent.
The fact that the KA has such a huge VRM heatsink leads me to my other comments on the Forum, particularly regarding the "fudge" aspect:
"""Henry is spot on - the notion that adding a heatsink to the top of the D2PAK or whatever MOSFETS is effective is virtually worthless. The device's die thermal junction is the tab on the device back - which is always against the PCB pad. The majority of heat is therefore dissipated in to the board, and the fact that the epoxy plastic encapsulation gets hot is simply due to the inability of the heat to be conducted away from the device die via the tab. Not sure when Epoxy become an effective conductor of heat.... Good practice is to increase the size of the PCB pad (or "land" in American) such that the enlarged PCB copper area acts as an adequate heatsink. This is still not as effective as clamping a power device tab to an actual piece of ali or copper, but since the devices used are SMD devices, this is not possible. However, the surface area required to provide sufficient PCB copper area to act as a heatsink for several devices isn't available in the current motherboard layouts. Where industrial SBC designs differ in this respect is to place the VRM MOSFETs on the back of the PCB on very enlarged PCB pads - where real estate for components is not an issue.
Gigabyte's UD3 2oz copper mainboards sound like a good idea, on the face of it. However, without knowing how they have connected the device tabs to where and what remains a mystery. I suspect it is more hype than solution, although there will be some positive effect. From an electrical perspective, having lower resistance connecting whatever to whatever (probably just a 0V plane) is no bad thing.
The way the likes of ASUS sort of get round the problem is to increase the sheer number of MOSFET devices and effectively spread the heat dissipation over a larger physical area. This works to a degree, there is the same amount of heat being dissipated, but over several more square inches. The other advantage of this is that each leg of the VRM circuit passes less current and therefore localised heat is reduced. Remember that as well as absolute peak operating temperature causing reduced component life, thermal cycling stresses the mechanical aspects of components (die wire bonds for example) as well as the solder joints on the board. Keeping components at a relatively constant temperature, even if this is high (but within operating temperature limits), is a means of promoting longevity.
For myself, the first thing I do with a seperate VRM heatsink is take it off and use a quiet fan to blow air on to the VRM area of the PCB - this is where the heat is. This has the added benefit of actively cooling the inductors and capacitors too....
Cooling the epoxy component body is a fudge. If the epoxy (and thus any heatsink plonked on top of it) is running at 60C, the component die is way above that.....
It's better than nothing, but only just."""
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