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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...
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];
...
Subscripts in plots in R
...
expression is your friend:
plot(1,1, main=expression('title'^2)) #superscript
plot(1,1, main=expression('title'[2])) #subscript
share
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Convert Enumeration to a Set/List
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There is a simple example of convert enumeration to list. for this i used Collections.list(enum) method.
public class EnumerationToList {
public static void main(String[] args) {
Vector<String> vt = new Vector<String&g...
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...
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 ...
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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