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AES Encryption for an NSString on the iPhone
...before any @implementation section in your AppDelegate.m or AppDelegate.mm file.
#import <CommonCrypto/CommonCryptor.h>
@implementation NSData (AES256)
- (NSData *)AES256EncryptWithKey:(NSString *)key {
// 'key' should be 32 bytes for AES256, will be null-padded otherwise
char keyPt...
What's the difference of “./configure” option “--build”, “--host” and “--target”?
...rchitecture of the build machine
--host=the architecture that you want the file to run on
However, when you are building toolchains, things can get more complicated. I think that the following is correct (though I can't say I've ever manually compiled a cross-debugger):
Lets say that you have:
...
Java, Classpath, Classloading => Multiple Versions of the same jar/project
...rsion of jars:
URLClassLoader loader1 = new URLClassLoader(new URL[] {new File("httpclient-v1.jar").toURL()}, Thread.currentThread().getContextClassLoader());
URLClassLoader loader2 = new URLClassLoader(new URL[] {new File("httpclient-v2.jar").toURL()}, Thread.currentThread().getContextClassLoader(...
How to swap keys and values in a hash
...
files = {
'Input.txt' => 'Randy',
'Code.py' => 'Stan',
'Output.txt' => 'Randy'
}
h = Hash.new{|h,k| h[k] = []} # Create hash that defaults unknown keys to empty an empty list
files.map {|k,v| h[v]<< k} #...
Does Python support multithreading? Can it speed up execution time?
...ot create an exhaustive list, ever, but the rule-of-thumb is that any I/O (file reading and writing, network sockets, pipes) is handled in C, and a lot of C libraries also release the GIL for their operations, but it is up to the libraries to document this for you.
– Martijn Pi...
Convert blob URL to normal URL
...browser to a server and have the server make it available like an ordinary file.
It is possible convert a blob: URL into a data: URL, at least in Chrome. You can use an AJAX request to "fetch" the data from the blob: URL (even though it's really just pulling it out of your browser's memory, not mak...
Replace selector images programmatically
...setImageDrawable() Thank you very much it worked and saved me about 40 xml files!
– dropsOfJupiter
Jan 16 '11 at 4:43
2
...
What are the differences between type() and isinstance()?
...fizz', 'buzz')]))
raises an error!
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 3, in foo
ValueError: argument must be a dict
isinstance
But if we use isinstance, we can support Liskov Substitution!:
def foo(a_dict):
if ...
Difference between applicationContext.xml and spring-servlet.xml in Spring Framework
...="test4.xml" />
The beans are instantiated from all four configuration files test1.xml, test2.xml, test3.xml, test4.xml.
Conclusion: In Scenario 2 applicationContext and DispatcherServlet are not related.
Scenario 3
In a web application with spring MVC.
In web.xml define:
<servlet>
<...
How to make an app's background image repeat
... drawable-mdpi & drawable-ldpi, you'll need to add this backrepeat.xml file and the relevant images to each of these to allow this functionality in high, medium and low dpi (dots per inch) screen sizes.
– saber tabatabaee yazdi
Nov 13 '13 at 14:29
...