padding | 易学教程

A way to find the size and location of padding in a struct?

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I'm trying to write a tool that will take as input some C code containing structs. It will compile the code, then find and output the size and offset of any padding the compiler decides to add to structs within it. This is pretty straightforward to do by hand for a known struct using offsetof, sizeof, and some addition, but I can't figure out an easy way to do it automatically for any input struct. If I knew how to iterate through all elements in a struct, I think I could get the tool written with no problems, but as far as I know there's no way to do that. I'm hoping some StackOverflow people

Padding in union is present or not

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Hello all, I want to know whether union uses padding? since the size of union is the largest data member size, can there be padding at the end? since the size of union is the largest data member size That need not be true. Consider union Pad { char arr[sizeof (double) + 1]; double d; }; The largest member of that union is arr . But usually, a double will be aligned on a multiple of four or eight bytes (depends on architecture and size of double ). On some architectures, that is even necessary since they don't support unaligned reads at all. So sizeof (union Pad) is usually larger than sizeof

iphoneX适配

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iphonex的适配需要两个条件： 1、ios开发人员提供全屏的webview 2、viewport meta标签谁知cover // 默认是contain 设置为cover时意思为覆盖全屏前端具体实现方案ru'xia： <meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover"> body { padding-top: constant(safe-area-inset-top); //为导航栏+状态栏的高度 88px padding-left: constant(safe-area-inset-left); //如果未竖屏时为0 padding-right: constant(safe-area-inset-right); //如果未竖屏时为0 padding-bottom: constant(safe-area-inset-bottom);//为底下圆弧的高度 34px } 来源： oschina 链接： https://my.oschina.net/bing309/blog/3134490

Where to find the twitter bootstrap less files?

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I'm trying to find a relatively easy way of adding padding to my containers with Twitter Bootstrap. All works well but at some resolutions, the window doesn't fit the screen. I figure I have to go and compensate for the padding by removing some of the width from various span classes? This is quite hard work, just the mathematics alone is problematic. For this reason, perhaps it's best to use the less file that Bootstrap apparently comes with. The only problem is I can't seem to find them anywhere. Do these files actually exist? Unfortunately I only know how to use Less through an app like

last block incomplete with CipherInputStream/CipherOutputStream, even with padding AES/CBC/PKCS5Padding

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问题 Actually, I searched lot from internet and in stackoverflow too for this, Initially I don't used padding in my encryption and decryption, But Finally I got solution from here https://stackoverflow.com/a/10775577/1115788 and I updated my code with padding as AES/CBC/PKCS5Padding and the same error is coming, and last block is not decrypted... I'm working on this for last two day, but no solution found my Crypter Code: package mani.droid.browsedropbox; import java.io.FileInputStream; import

css学习

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伪类： <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>css学习</title> <style> input:focus{ background: #0E5C2F; } </style> </head> <body>  <input type="text"> </body> </html> 伪元素使用： <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>css学习<

如何写出更好的Java代码

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编码风格传统的Java编码方式是非常啰嗦的企业级JavaBean的风格。新的风格更简洁准确，对眼睛也更好。结构体我们这些码农干的最简单的事情就是传递数据了。传统的方式就是定义一个JavaBean: <code style="margin: 0px; padding: 0px; max-width: 100%; font-family: Fixedsys; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248); box-sizing: border-box !important; overflow-wrap: break-word !important;">public class DataHolder {<br data-filtered="filtered" style="line-height: normal; margin: 0px; padding: 0px; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important;"> nbsp nbsppublic final String data;<br data-filtered="filtered" style="line-height

Style the first <td> column of a table differently

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问题 If I have a table with two columns, how do I specify a padding or any other css so that it is applied just for the first column of <td> s. Also how do I style an n-th column similarly? 回答1: You could use the n-th child selector. to target the nth element you could then use: td:nth-child(n) { /* your stuff here */ } (where n starts at 1) 回答2: If you've to support IE7, a more compatible solution is: /* only the cells with no cell before (aka the first one) */ td { padding-left: 20px; } /* only

jQuery UI 模态表单疯狂踩坑

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想套用一下前端的组件写一个表单验证的页面，于是试了一下jQuery UI 官网的例子首先把官网的例子贴上： <!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>jQuery UI Dialog - Modal form</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css"> <link rel="stylesheet" href="/resources/demos/style.css"> <style> label, input { display:block; } input.text { margin-bottom:12px; width:95%; padding: .4em; } fieldset { padding:0; border:0; margin-top:25px; } h1 { font-size: 1.2em; margin: .6em 0; } div#users-contain { width: 350px

Why do Java objects have to be a multiple of 8?

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I know that Java uses padding; objects have to be a multiple of 8 bytes. However, I dont see the purpose of it. What is it used for? What exactly is its main purpose? Its purpose is alignment , which allows for faster memory access at the cost of some space. If data is unaligned, then the processor needs to do some shifts to access it after loading the memory. Additionally, garbage collection is simplified (and sped up) the larger the size of the smallest allocation unit. It's unlikely that Java has a requirement of 8 bytes (except on 64-bit systems), but since 32-bit architectures were the

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