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Get average color of image via Javascript
...p;& canvas.getContext('2d'),
data, width, height,
i = -4,
length,
rgb = {r:0,g:0,b:0},
count = 0;
if (!context) {
return defaultRGB;
}
height = canvas.height = imgEl.naturalHeight || imgEl.offsetHeight || imgEl.height;
width = can...
Why exactly is eval evil?
...e a macro that based on the first parameter uses either SIN or COS.
(foo 3 4) does (sin 4) and (foo 1 4) does (cos 4).
Now we may have:
(foo (+ 2 1) 4)
This does not give the desired result.
One then may want to repair the macro FOO by EVALuating the variable:
(defmacro foo (a b)
(list (if (eql (...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...filename的值。
str()用来把字符串指针转换成字符串。
4. 进程的系统调用记数统计
bpftrace -e 'tracepoint:raw_syscalls:sys_enter { @[comm] = count(); }'
Attaching 1 probe...
^C
@[bpftrace]: 6
@[systemd]: 24
@[snmp-pass]: 96
@[sshd]: 125
按Ctrl-C后打...
Avoiding if statement inside a for loop?
...
4 Answers
4
Active
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How to redirect both stdout and stderr to a file [duplicate]
...
447
If you want to log to the same file:
command1 >> log_file 2>&1
If you want dif...
How to return PDF to browser in MVC?
... |
edited Aug 29 '16 at 14:24
Tomas Kubes
18.7k1414 gold badges8585 silver badges122122 bronze badges
a...
Remove local git tags that are no longer on the remote repository
...ags origin
That returns a list of hashes and friendly tag names, like:
94bf6de8315d9a7b22385e86e1f5add9183bcb3c refs/tags/v0.1.3
cc047da6604bdd9a0e5ecbba3375ba6f09eed09d refs/tags/v0.1.4
...
2f2e45bedf67dedb8d1dc0d02612345ee5c893f2 refs/tags/v0.5.4
You could certainly put t...
Reflection: How to Invoke Method with parameters
...
240
Change "methodInfo" to "classInstance", just like in the call with the null parameter array.
...
Random string generation with upper case letters and digits
...hically more secure version; see https://stackoverflow.com/a/23728630/2213647:
''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(N))
In details, with a clean function for further reuse:
>>> import string
>>> import random
>>> d...