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两种js滑动门(tab切换)效果 - 源码下载 - 清泛网 - 专注C/C++及内核技术
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WinXP,Win7,Win8,Win10未知
PHP random string generator
...itive integer");
}
$pieces = [];
$max = mb_strlen($keyspace, '8bit') - 1;
for ($i = 0; $i < $length; ++$i) {
$pieces []= $keyspace[random_int(0, $max)];
}
return implode('', $pieces);
}
Usage:
$a = random_str(32);
$b = random_str(8, 'abcdefghijklmnopqrstuvwxyz')...
Creating a temporary directory in Windows?
What's the best way to get a temp directory name in Windows? I see that I can use GetTempPath and GetTempFileName to create a temporary file, but is there any equivalent to the Linux / BSD mkdtemp function for creating a temporary directory?
...
What does “dereferencing” a pointer mean?
...example, if the string literal happened to be at address 0x1000 and p a 32-bit pointer at 0x2000, the memory content would be:
Memory Address (hex) Variable name Contents
1000 'a' == 97 (ASCII)
1001 'b' == 98
1002 ...
What is the difference between user and kernel modes in operating systems?
...T instructions.
cannot do IO instructions like in and out, and thus have arbitrary hardware accesses.
Otherwise, for example, file permissions would be useless if any program could directly read from disk.
More precisely thanks to Michael Petch: it is actually possible for the OS to allow IO instr...
How do you run your own code alongside Tkinter's event loop?
...roperly and cleanly close when the [X] button was clicked, this along with win32gui.FindWindow(None, 'window title') did the trick! I'm such a noob ;-)
– JxAxMxIxN
Oct 16 '16 at 14:48
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Render HTML to PDF in Django site
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Man, reportlab is pita to install on windows 7 64bit, python2.7 64bit. Still trying...
– Andriy Drozdyuk
Jul 14 '11 at 18:33
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Real world use cases of bitwise operators [closed]
What are some real world use cases of the following bitwise operators?
41 Answers
41
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How to allocate aligned memory only using the standard library?
...nt to round down to the 16-byte boundary — so I want to reset the last 4 bits to 0. 0x0F has the last 4 bits set to one; therefore, ~0x0F has all bits set to one except the last four. Anding that with 0x800011 gives 0x800010. You can iterate over the other offsets and see that the same arithmet...
Is it better to use std::memcpy() or std::copy() in terms to performance?
...ays was passed in to the function as a function parameter.
I did a little bit more testing to see what I could do to make std::copy faster again. The answer turned out to be simple: turn on link time optimization. These are my results with LTO turned on (option -flto in gcc):
Time (in seconds) to ...