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UUID (Universally Unique Identifier): A sequence of 128 bits that can guarantee uniqueness across space and time, defined by [RFC 4122][rfc4122].
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GUID (Globally Unique Identifier): Microsoft's implementation of the UUID specification; often used interchangeably with UUID.
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UDID _(Unique Device Identifier)): A sequence of 40 hexadecimal characters that uniquely identify an iOS device (the device's Social Security Number, if you will). This value can be retrieved through iTunes, or found using UIDevice -uniqueIdentifier. Derived from hardware details like MAC address.
Felipe Kellermann felipek
steipete
/ UIKitLegacyDetector.m
Last active
May 21, 2025 10:07
A simple way to detect at runtime if we're running in UIKit legacy mode or the new "flat" variant. Written for our PDF iOS SDK (http://pspdfkit.com), where the precompiled binary needs to detect at runtime in what variant it's running. Want more stuff like that? Follow me on Twitter: http://twitter.com/steipete
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| // Taken from http://PSPDFKit.com. This snippet is under public domain. | |
| #define UIKitVersionNumber_iOS_7_0 0xB57 | |
| BOOL PSPDFIsUIKitFlatMode(void) { | |
| static BOOL isUIKitFlatMode = NO; | |
| static dispatch_once_t onceToken; | |
| dispatch_once(&onceToken, ^{ | |
| // We get the modern UIKit if system is running >= iOS 7 and we were linked with >= SDK 7. | |
| if (kCFCoreFoundationVersionNumber >= kCFCoreFoundationVersionNumber_iOS_7_0) { | |
| isUIKitFlatMode = (NSVersionOfLinkTimeLibrary("UIKit") >> 16) >= UIKitVersionNumber_iOS_7_0; | |
| } |
zwaldowski
/ gist:6526790
Last active
December 22, 2015 20:29
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| extern uint32_t dyld_get_program_sdk_version() WEAK_IMPORT_ATTRIBUTE; | |
| extern BOOL DZApplicationUsesLegacyUI(void) | |
| { | |
| static dispatch_once_t onceToken; | |
| static BOOL legacyUI = NO; | |
| dispatch_once(&onceToken, ^{ | |
| uint32_t sdk = __IPHONE_OS_VERSION_MIN_REQUIRED; | |
| if (dyld_get_program_sdk_version != NULL) { | |
| sdk = dyld_get_program_sdk_version(); |
hujunfeng
/ udid-faq.md
Last active
January 24, 2024 14:15
UDID, identifierForVendor and advertisingIdentifier FAQ
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| NSUInteger PSPDFHashFromCGRect(CGRect rect) { | |
| return (*(NSUInteger *)&rect.origin.x << 10 ^ *(NSUInteger *)&rect.origin.y) + (*(NSUInteger *)&rect.size.width << 10 ^ *(NSUInteger *)&rect.size.height); | |
| } |
Prerequisites:
- One or more clients running a UNIX-like OS. Examples are given for Ubuntu 12.04 LTS, although all software components are available for other platforms as well (e.g. OS X). YMMV
- A cheap Ubuntu 12.04 VPS with storage. I recommend Backupsy, they offer 250GB storage for $5/month. Ask Google for coupon codes.
Software components used:
steipete
/ PSPDFUIKitMainThreadGuard.m
Last active
October 30, 2025 15:53
This is a guard that tracks down UIKit access on threads other than main. This snippet is taken from the commercial iOS PDF framework http://pspdfkit.com, but relicensed under MIT. Works because a lot of calls internally call setNeedsDisplay or setNeedsLayout. Won't catch everything, but it's very lightweight and usually does the job.You might n…
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| // Taken from the commercial iOS PDF framework http://pspdfkit.com. | |
| // Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved. | |
| // Licensed under MIT (http://opensource.org/licenses/MIT) | |
| // | |
| // You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it. | |
| // PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit. | |
| #import <objc/runtime.h> | |
| #import <objc/message.h> |
nettles-jarrod
/ blog - Explaining My Choices Further.md
Last active
April 25, 2023 19:31
In which I do a little digging about the choices I've made with PHP. This is a long read, but it isn't something that can be explained in one or two paragraphs.
In the comments from my last post and on Twitter I noticed a lot of people who had something to say about PHP. The comments were varied but they usally sounded something like this (sorry @ipetepete, I picked yours because it was the shortest).
...the little bits of soul from all of us who've had to work on, and or maintain large PHP applications. – ipetepete
In Pete's defense, he did go on to say that rest of the stack I was using was a "smorgasbord of awesome". Thanks, Pete. I agree!
I would, however, like to take a little time to correct a misperception in the developer community about PHP. I recently got into this same... discussion... with Jeff Atwood, and I seem to be running into it more and more. So here goes. Please bear with me as I cover a little history further on.
Pete, and everybody else, _you're exactly rig
desandro
/ require-js-discussion.md
Created
January 31, 2013 20:26
Can you help me understand the benefit of require.js?
I'm having trouble understanding the benefit of require.js. Can you help me out? I imagine other developers have a similar interest.
From Require.js - Why AMD:
The AMD format comes from wanting a module format that was better than today's "write a bunch of script tags with implicit dependencies that you have to manually order"
I don't quite understand why this methodology is so bad. The difficult part is that you have to manually order dependencies. But the benefit is that you don't have an additional layer of abstraction.
klange
/ _.md
Last active
December 23, 2024 14:40
It's a résumé, as a readable and compilable C source file. Since Hacker News got here, this has been updated to be most of my actual résumé. This isn't a serious document, just a concept to annoy people who talk about recruiting and the formats they accept résumés in. It's also relatively representative of my coding style.
Since this is on Hacker News and reddit...
- No, I don't distribute my résumé like this. A friend of mine made a joke about me being the kind of person who would do this, so I did (the link on that page was added later). My actual résumé is a good bit crazier.
- I apologize for the use of
_tin my types. I spend a lot of time at a level where I can do that; "reserved for system libraries? I am the system libraries". - Since people kept complaining, I've fixed the assignments of string literals to non-const
char *s. - My use of
type * name, however, is entirely intentional. - If you're using an older compiler, you might have trouble with the anonymous unions and the designated initializers - I think gcc 4.4 requires some extra braces to get them working together. Anything reasonably recent should work fine. Clang and gcc (newer than 4.4, at le