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A migration to add unique constraint to a combination of columns
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answered Jul 30 '10 at 9:45
Robert SpeicherRobert Speicher
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Does JavaScript guarantee object property order?
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The iteration order for objects follows a certain set of rules since ES2015, but it does not (a...
git remote add with other SSH port
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answered Aug 29 '10 at 19:38
igorwigorw
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How to display a dynamically allocated array in the Visual Studio debugger?
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Yes, simple.
say you have
char *a = new char[10];
writing in the debugger:
a,10
would show you the content as if it were an array.
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Ruby class types and case statements
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answered Oct 11 '10 at 17:11
NakilonNakilon
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How do I get monitor resolution in Python?
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How do I get the color from a hexadecimal color code using .NET?
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answered Jan 21 '10 at 14:32
ThorarinThorarin
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Is there a TRY CATCH command in Bash
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edited Feb 19 at 5:20
answered Feb 25 '14 at 9:50
Jay...
Angular.js programmatically setting a form field to dirty
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edited Mar 30 '16 at 16:43
Mosh Feu
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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
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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...