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What do the plus and minus signs mean in Objective-C next to a method?
In Objective-C, I would like to know what the + and - signs next to a method definition mean.
4 Answers
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Simple insecure two-way data “obfuscation”?
I'm looking for very simple obfuscation (like encrypt and decrypt but not necessarily secure) functionality for some data. It's not mission critical. I need something to keep honest people honest, but something a little stronger than ROT13 or Base64 .
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Specifying and saving a figure with exact size in pixels
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Matplotlib doesn't work with pixels directly, but rather physical sizes and DPI. If you want to display a figure with a certain pixel size, you need to know the DPI of your monitor. For example this link will detect that for you.
If you have an image of 3841x7195 pixels it is unlikely that you m...
What is a message pump?
...ng Office in an interactive session on a desktop, with a monitor, keyboard and mouse and, most importantly, a message pump." I'm not sure what that is. (I've been programming in C# for only about a year; my other programming experience has primarily been with ColdFusion.)
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Does Python support multithreading? Can it speed up execution time?
...n threads in parallel.
This only applies to Python code. C extensions can and do release the GIL to allow multiple threads of C code and one Python thread to run across multiple cores. This extends to I/O controlled by the kernel, such as select() calls for socket reads and writes, making Python ha...
Select random lines from a file
In a Bash script, I want to pick out N random lines from input file and output to another file.
4 Answers
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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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关于QR Code Specification，可参看这个PDF：http://raidenii.net/files/datasheets/misc/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...
What is the best way to create constants in Objective-C
...the files. Is it a good way of doing things? Also, I've done my research and found several methods to create constants, but I don't know which one to use:
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Connecting to Azure website via FTP
...ve you seen this answer? are you using the full credentials including site and a proper ftp client?
– Simon Opelt
Mar 15 '14 at 22:53
7
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What is the difference between “screen” and “only screen” in media queries?
What is the difference between screen and only screen in media queries?
5 Answers
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