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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
...c/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...
Conditional compilation and framework targets
... work?
– Akash Kava
Dec 22 '10 at 9:40
This answer isn't just about having defined constants for the framework but als...
Is there a way to use SVG as content in a pseudo element :before or :after
...g xmlns="http://www.w3.org/2000/svg">
<circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red"/>
<polyline points="20,20 40,25 60,40 80,120 120,140 200,180" style="fill:none;stroke:black;stroke-width:3"/>
</svg>
...
How to sort by two fields in Java?
... people.add(new Person("Barry", 20));
people.add(new Person("Cathy", 40));
people.add(new Person("Bob", 40));
people.add(new Person("Barry", 50));
// Define chained comparators:
// Great article explaining this and how to make it even neater:
// http://blog.jooq.org/2014/0...
深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... DOS 提供给用户的系统调用！
在这里我将展示，使用 0x40 向量作为自己的中断服务例程向量，我所需要做的是：
写一个自己的中断服务例程，在本例中的 my_isr
设置向量 0x40 的 segment 和 offset 值
调用 int 0x40 进行测试
中断...
What are the mathematical/computational principles behind this game?
...1, 22, 23, 24, 25, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46,
47, 48, 49, 50, 51, 52, 53, 54, 55, 56], blocks=[[0, 1, 2, 3, 4, 5, 6,
56], [0, 7, 14, 21, 28, 35, 42, 49], [0, 8, 16, 24, 32, 40, 48, 50], [0,
9, 18, 27, 29, 38, 47, 51], [0, 10, 20, 23, 33, 36, 4...
Postgresql - change the size of a varchar column to lower length
...ts columns is a varchar(255) and I would like to resize it to a varchar(40) .
Basically, I would like to change my column by running the following command:
...
How to make space between LinearLayout children?
...utParams.
– Thomas
Nov 23 '10 at 19:40
1
What attribute would I set in LinearLayout.LayoutParams?...
How do I set the offset for ScrollSpy in Bootstrap?
... CSS will take care of the nav-bar offset for you:
body {
margin-top: 40px;/* make room for the nav bar */
}
/* make room for the nav bar */
h1[id],
h2[id],
h3[id],
h4[id],
h5[id],
h6[id],
dt[id]{
padding-top: 60px;
margin-top: -40px;
}
...
Extract date (yyyy/mm/dd) from a timestamp in PostgreSQL
...
answered May 26 '11 at 2:40
Wayne ConradWayne Conrad
85.6k1919 gold badges143143 silver badges180180 bronze badges
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