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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
.../qr_code.pdf
基础知识
首先，我们先说一下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号） 最...
When should the volatile keyword be used in C#?
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10 Answers
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Is there any way to redraw tmux window when switching smaller monitor to bigger one?
...-option -t "$tmp" set-remain-on-exit on
tmux new-window -kt "$tmp":0 \
'echo "Use Prefix + L (i.e. ^B L) to return to session."'
fi
# switch any clients attached to the target session to the temp session
session="$1"
for client in $(tmux list-clients -t "$session...
Collapsing Sidebar with Bootstrap
...) {
.row-offcanvas {
position: relative;
-webkit-transition: all 0.25s ease-out;
-moz-transition: all 0.25s ease-out;
transition: all 0.25s ease-out;
}
.row-offcanvas-right
.sidebar-offcanvas {
right: -41.6%;
}
.row-offcanvas-left
.sidebar-offcanvas {
left: -41...
Working with select using AngularJS's ng-options
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800
One thing to note is that ngModel is required for ngOptions to work... note the ng-model="blah"...
VS2005混合编译ARM汇编代码 - C/C++ - 清泛网 - 专注C/C++及内核技术
VS2005混合编译ARM汇编代码公司HW team有人希望可以给他们写一个在WinCE上，单独读写DDR的工具，以方便他们量测Memory读写时的硬件信号。在开发过程中，发现简单的在...公司HW team有人希望可以给他们写一个在WinCE上，单独读写DDR的...
How can I round up the time to the nearest X minutes?
...icks * d.Ticks, dt.Kind);
}
Example:
var dt1 = RoundUp(DateTime.Parse("2011-08-11 16:59"), TimeSpan.FromMinutes(15));
// dt1 == {11/08/2011 17:00:00}
var dt2 = RoundUp(DateTime.Parse("2011-08-11 17:00"), TimeSpan.FromMinutes(15));
// dt2 == {11/08/2011 17:00:00}
var dt3 = RoundUp(DateTime.Parse...
How to determine SSL cert expiration date from a PEM encoded certificate?
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With openssl:
openssl x509 -enddate -noout -in file.pem
The output is on the form:
notAfter=Nov 3 22:23:50 2014 GMT
Also see MikeW's answer for how to easily check whether the certificate has expired or not, or whether it will within a certain...
What exactly is Type Coercion in Javascript?
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10 Answers
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