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In Objective-C why should I check if self = [super init] is not nil?
...the return value from [super init] is nil and you check it, as recommended by standard practices, and then return prematurely if nil, basically your app is still not going to work correctly.
If you think about it, even though that if (self != nil) check is there, for proper operation of your class,...
How to get current memory usage in android?
...double)mi.totalMem * 100.0;
Explanation of the number 0x100000L
1024 bytes == 1 Kibibyte
1024 Kibibyte == 1 Mebibyte
1024 * 1024 == 1048576
1048576 == 0x100000
It's quite obvious that the number is used to convert from bytes to mebibyte
P.S: we need to calculate total m...
Do I have to guard against SQL injection if I used a dropdown?
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How cute! It's little Bobby Tables!
– Aura
May 22 '14 at 18:26
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“unpacking” a tuple to call a matching function pointer
... @NirFriedman: Sure, just replace the unspecialized version of gens by: template <int N, int... S> struct gens { typedef typename gens<N-1, N-1, S...>::type type; };
– marton78
Apr 16 '15 at 14:11
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How to detect page zoom level in all modern browsers?
... in terms of device pixels (instead of relative to default zoom), multiply by window.devicePixelRatio.
Old WebKit? (unverified): parseInt(getComputedStyle(document.documentElement,null).width) / document.documentElement.clientWidth (from this answer)
Opera: document.documentElement.offsetWidth / wid...
Sending email through Gmail SMTP server with C#
...gle)
Make sure you don't have to enter a captcha code first. You can do so by sending a test email from your browser.
Make changes in web.config (or app.config, I haven't tried that yet but I assume it's just as easy to make it work in a windows application):
<configuration>
<appSe...
How do I byte-compile everything in my .emacs.d directory?
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C-u 0 M-x byte-recompile-directory
will compile all the .el files in the directory and in all subdirectories below.
The C-u 0 part is to make it not ask about every .el file that does not have a .elc counterpart.
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Generate random password string with requirements in javascript
...sword. Worse, it reduces the number of possible passwords, so that hacking by bruteforcing becomes easier.
To generate a random word consisting of alphanumeric characters, use:
var randomstring = Math.random().toString(36).slice(-8);
How does it work?
Math.random() // Gen...
How to log out user from web site using BASIC authentication?
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An addition to the answer by bobince ...
With Ajax you can have your 'Logout' link/button wired to a Javascript function. Have this function send the XMLHttpRequest with a bad username and password. This should get back a 401. Then set document.locat...
Space between two rows in a table?
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It doesn't always have to by fancy CSS if good old HTML can do the job :)
– luator
Jul 13 '16 at 15:38
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