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NSUserDefaults - How to tell if a key exists
...:' reference means just that: the object. NOT the key. IOW, in your header file if you've defined: #define kMyKey @"myKey" the 'containsObject' is not looking for 'kMyKey', it's looking for 'myKey'. Using 'kMyKey' will always return 'NO.'
– Bill Norman
Jul 19 '...
Controlling a USB power supply (on/off) with Linux
... new hell to perform a redirect, then output something into the redirected file descriptor.
– dig
May 12 '15 at 19:26
...
Understand homebrew and keg-only dependencies
...hat depends on it has to be compiled with specific instructions to use the files in /usr/local/Cellar. That's done automatically by brew install when a formula specifies keg-only dependencies.
Formulas that specify keg-only dependencies make sure that the equivalent system libraries are not used. Y...
How do you truncate all tables in a database using TSQL?
...DROP and CREATE" (pic 3)
Choose to save script to a new editor window or a file and run as necessary.
this will give you a script that drops and recreates all your tables without the need to worry about debugging or whether you've included everything. While this performs more than just a truncate,...
https URL with token parameter : how secure is it?
...Also depending on your web server the full URL might get logged in its log files. Depending on how sensitive the data is you might not want your IT people having access to all the tokens.
Additionally the URL with the query string would be saved in your user's history, allowing other users of the s...
What are WSDL, SOAP and REST?
.... However, in this case the class does not exist in the local applications file system, but at a remote site accessed over http."
...
"If we think of using a SOAP service as just another PHP class then the WSDL document is a list of all the available class methods and properties. "
http://www.double...
How do I print the type or class of a variable in Swift?
...assName() will print the name of the class.
– Analog File
Jun 5 '14 at 3:09
18
the printClassName...
Is there any performance gain in indexing a boolean field?
...QL can quickly determine the position to seek to in the middle of the data file without having to look at all the data.
I think it's also safe to say an index will not DECREASE performance in this case, so you have only to gain from it.
...
Multiple Inheritance in PHP
... is just a sample) where you want to have generic things like debug into a file, send SMS for critical problem and so on. All your classes are children of this class. Now suppose you want to create a class Exception that should have those functions (= child of Tracing). This class must be a child of...
how to override left:0 using CSS or Jquery?
... {
left: auto;
}
Make sure that the above comes after the original CSS file.
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