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How are software license keys generated?
...ally have no idea how license keys are generated. What is a good (secure) example of license key generation? What cryptographic primitive (if any) are they using? Is it a message digest? If so, what data would they be hashing? What methods do developers employ to make it difficult for crackers to bu...
Understanding reference counting with Cocoa and Objective-C
... object when I'm done with it. If I don't, there will be a memory leak.
Example of object creation:
NSString* s = [[NSString alloc] init]; // Ref count is 1
[s retain]; // Ref count is 2 - silly
// to do this after init
[s rel...
Are lists thread-safe?
...y attempts to concurrently access, the lists's data is not protected. For example:
L[0] += 1
is not guaranteed to actually increase L[0] by one if another thread does the same thing, because += is not an atomic operation. (Very, very few operations in Python are actually atomic, because most of t...
How to prevent favicon.ico requests?
... it is not always desired and sometime developers need a way to avoid the extra payload. For example an IFRAME would request a favicon without showing it.
Worst yet, in Chrome and Android an IFRAME will generate 3 requests for favicons:
"GET /favicon.ico HTTP/1.1" 404 183
"GET /apple-touch-icon-prec...
What's the best way to put a c-struct in an NSArray?
...bly lighter weight than NSData for simple data structures.
Simply use an expression like the following:
[NSValue valueWithBytes:&p objCType:@encode(Megapoint)];
And to get the value back out:
Megapoint p;
[value getValue:&p];
...
NSURLRequest setting the HTTP header
...
Excellent answer! I wanted to point out that RamS's answer has nice documentation.
– fskirschbaum
Dec 13 '14 at 19:25
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How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)?
...ile. Here is the result:
+ (NSArray*)getRGBAsFromImage:(UIImage*)image atX:(int)x andY:(int)y count:(int)count
{
NSMutableArray *result = [NSMutableArray arrayWithCapacity:count];
// First get the image into your data buffer
CGImageRef imageRef = [image CGImage];
NSUInteger width ...
BASH copy all files except one
I would like to copy all files out of a dir except for one named Default.png. It seems that there are a number of ways to do this. What seems the most effective to you?
...
Generating all permutations of a given string
... about longer string such as abcdefgh ? Is there any Java implementation example?
52 Answers
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Fastest way to extract frames using ffmpeg?
Hi I need to extract frames from videos using ffmpeg.. Is there a faster way to do it than this:
6 Answers
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