padding | 易学教程

How to append to AES encrypted file

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问题 I'm writing some kind of logger that produces encrypted log-file. Unfortunately, cryptography is not my strong side. Now I can write to file several messages and then close file. Then i can open it, append some messages, close again and after decryption I see padding bytes in the middle of file. Is there any way to work with encrypted file without having to decrypt it every time I want to append some messages? EDIT : little more details. Current implementation utlizes CipherOutputStream. As i

图片翻转3D效果

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=gb2312" http-equiv=Content-Type> <STYLE>HTML { BACKGROUND: #000 } BODY { PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px } UL { PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px } LI { LIST-STYLE-TYPE: none; LIST-STYLE-IMAGE: none } IMG { BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; DISPLAY: block; BORDER-TOP: medium none; BORDER-RIGHT: medium none } .slide-wp { POSITION: absolute; MARGIN-TOP:

标准模型与怪异模型

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㈠原理 ⑴css 属性——Box Moel分为两种：W3C标准和IE标准盒子模型。 ⑵大多数浏览器采用W3C标准模型，而IE中采用Microsoft自己的标准。 ⑶怪异模式是“部分浏览器在支持W3C标准的同时还保留了原来的解析模式”，怪异模式主要表现在IE内核的浏览器。 ⑷当不对Doctype进行定义时，会触发怪异模式。㈡标准模型和怪异模型的区别： ⑴在标准模式下，一个块的总宽度=width+margin(左右)+padding(左右)+border(左右) ⑵在怪异模式下，一个块的总宽度=width+margin（左右）（既width已经包含了padding和border值） ⑶具体看下面的模型图：标准模型：怪异模型：㈢总长度的差别那么，到底这两个公式里提到的总宽度是什么意思呢？两种模式最终效果有什么差别呢？ ⒈标准模式的代码如下图所示：效果如下图所示： ★标准模式，我们设置#box的宽高为400px，其对应的content（内容区）宽高为400px 2.怪异模式的代码如下图所示：效果图图下图所示： ★标准模式，我们设置#box的宽高为400px，在怪异模型中，其对应的content（内容区）宽高却是 width-上下padding-上下border，结果为350px; 我们很明显的看到怪异模型下的宽度变小了。希望有所帮助。来源： https://www

小白之旅17-1

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CSS 1. 概述 Cacasding Style Sheet，级联（层叠）样式表专门用于设置页面标签的样式注释：/* 注释内容 */ 2. 标准格式格式：选择器{ 样式名1：值1; 样式名2：值2; ... } 3. CSS的引入 1.1 内联样式写法：把样式写在标签内特点：只能影响到这个一个标签格式：标签名> 1.2 内部样式表写法：将style标签写在head中，在这个style标签中使用css的标准书写格式进行样式的统一设置特点：可以影响到整个页面的标签格式： <head> <style type="text/css"> 选择器{ 样式名1：值1; 样式名2：值2; ... } </style> </head> 1.3 外部样式表写法：在外部定义一个.css的文件，然后在这个css文件中使用css的标准书写格式进行多个页面样式的统一设置，最后使用link标签在想要使用该css文件的页面的head中引入。特点：可以影响到多个页面的标签格式： 1.4 三种样式写法的优先级 1、内联样式>内部、外部 2、内部、外部谁写在后面样式就跟着谁 4. 选择器概念：根据指定的形式定位到指定元素的方式 4.1 元素选择器格式：标签名{样式} 4.2 类选择器做法：为指定标签添加class属性，并为这些标签设置相同的class值格式：

Remove unwanted White Space in WebView Android

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问题 I have started developing an App using WebView. Actually I am loading an Image with Webview (I like to use the built-in zoom controls of the class). I can successfully load the Image but I can see some irritating white spaces. I can't find the way to remove it. My Images are 750 * 1000 in size. I have attached my code below. webview.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android

JS 的 Element元素对象

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在 HTML DOM 中, 元素对象代表着一个 HTML 元素。元素对象的子节点可以是, 可以是元素节点，文本节点，注释节点。 NodeList 对象代表了节点列表，类似于 HTML元素的子节点集合。 Element对象的属性和方法 1.元素特性相关属性　　element.id 设置/返回元素的id 　　element.tagName 设置/返回元素的标签名　　element.dir 设置/返回元素的文字方向　　element.accessKey 设置/返回元素的快捷键　　element.draggable 设置/返回元素的是否可拖拽　　element.lang 设置/返回元素的语言　　element.tabIndex 设置/返回元素的在Tab键遍历时的顺序，-1表示不可被遍历　　element.hidden 设置/返回元素是否可见　　element.contentEditable 设置/返回元素是否可编辑　　element.isContentEditable 返回元素是否可编辑 2.元素状态相关属性　　element.attributes 设置/返回元素的属性，返回一个类似数组的对象。　　element.className 设置/返回元素的类名，它的值是一个字符串，每个class之间用空格分隔　　element.classList 设置

Does the <html> element have a default margin or padding in any browser, since normalize.css doesn't reset it?

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问题 I'm using normalize.css, and I saw that it doesn't reset margins or padding for the <html> element. Since I assume they've done their research I was wondering: does the <html> element have a default margin or padding in any browser? Is it right of me to assume that it doesn't and that this is why normalize.css doesn't reset it? 回答1: The <html> tag does not have any CSS rules automatically applied to it. You can apply styles if you like, but the only time I've ever done it is to get 100%

Adding padding to select options

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问题 I want to add some kind of space(padding, margin or whatever) between select options in html using css. I've already tried using something like: select option { padding:10px } however it didn't work. I've already read that this is possible to do but it does not work in IE. Anyway, i'd like to have this to work in other browsers even if it doesn't work in IE. PS: currently using Chrome JSFiddle example 回答1: styling to select option is very much limited as to maintain a coherence and

GridView and excess space padding

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问题 I have a problem with grid view layout on Android. I can't find solution to eliminate extra space in grid view. I tried a lot of things (numColumns, columnWidth, stretchMode, gravity) and advices (from StackOverflow), but nothing works correctly. I spent almost 8 hours with this problem. Here is a code of grid view: <GridView android:id="@+id/lookbook_gridview" android:layout_width="fill_parent" android:layout_height="wrap_content" android:listSelector="@null" android:padding="0dip" android

Right padding with zeros in Java

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问题 Sorry if this question was made already, I've made a deep search and nothing. Now, I know that: String.format("%05d", price); Will be padding my price with zeros to the left, so a price of 25 will result in 00025 What if I want to pad them to the right, so the result is 25000 ? How do I do that using only String.format patterns? 回答1: You could use: String.format("%-5s", price ).replace(' ', '0') Can I do this using only the format pattern? String.format uses Formatter.justify just like the

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