base64 | 易学教程

SaaS-图片上传

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1 图片上传 1.1 需求分析如图所示，实现员工照片上传功能 1.2 Data URL 1.2.1 DataURL概述所谓DataURL是指"data"类型的Url格式，是在RFC2397中提出的，目的是对于一些“小”的数据，可以在网页中直接嵌入，而不是从外部文件载入。 1.2.2 Data URL入门完整的DataURL语法：DataURL= data:mediatype;base64,<Base64编码的数据>。 mediatype：表述传递的数据的MIME类型（text/html，image/png，image/jpg）简单的说，data类型的Url大致有下面几种形式。 data : , < 文本数据 > data : text / plain , < 文本数据 > data : text / html , < html代码 > data : text / html ; base64 , < base64编码的html代码 > data : text / css , < css代码 > data : text / css ; base64 , < base64编码的css代码 > data : text / javascript , < javascript代码 > data : text / javascript ; base64 , <

How to convert an image to a base64 string with gzip- android

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问题 I am trying to convert and compress an image taken from a filepath on android to be converted with base64's gzip (i am using this because my desktop version, written in java, is doing the same). Here is what I have currently for compression: Bitmap bm = BitmapFactory.decodeFile(imagePath); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); byte[] data = baos.toByteArray(); String base64Str = null; ByteArrayOutputStream out_bytes = new

C++简单实现Base64的编解码

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Base64是个很简单的将数据编码为可见字符的算法。就是将原始数据每6个位取出来，找一个可见字符代替，这样4个可见字符刚好可以代替原来的3个字节，原理不多说，直接上代码。 PS:代码只实现对可见字符的加解密，不可打印的还要修改。 #include <string> using namespace std; string Code("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"); string Base64Encode(string data) { size_t len = data.size() / 3; string out; const unsigned char* input = (unsigned char*)data.data(); for (size_t i = 0; i < len; i++){ out += Code[input[0] >> 2]; out += Code[((input[0] & 0x03) << 4 )+ (input[1] >> 4)]; out += Code[((input[1] & 0x0f) << 2) + (input[2] >> 6)]; out += Code[input[2] & 0x3f]; input += 3; } len = data

JSON encode/decode base64 encode/decode in JavaScript

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问题 Is there JSON encode/decode base64 encode/decode function in JavaScript? 回答1: Yes, btoa() and atob() work in some browsers: var enc = btoa("this is some text"); alert(enc); alert(atob(enc)); 回答2: JSON and base64 are completely independent. Here's a JSON stringifier/parser (and direct GitHub link). Here's a base64 Q&A. Here's another one. 回答3: This might be helpful for you. Using a combination of this project crypto-js and Prototype to parse JSON I wrote two function to encode/decode JSON to

Swift Base64 Format

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问题 On this website, for example when you drop in an image, it is turned into a proper base64 format: http://base64image.org/ In my Swift app, here is what I have to generate a base64 string from an image: let image_Data = UIImagePNGRepresentation(default_image) let base64String = image_Data!.base64EncodedStringWithOptions(.Encoding64CharacterLineLength) This gives me something similar, but it has spaces and line breaks. How do I get an output just like the output from the website above? 回答1: let

OutOfMemory when creating Base64 string in java?

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问题 I used ostermillerutils library to create base64 string but I get OutOfMemory error if the image is heavy. If the image I try to convert is a simple image, the code is working fine. public String createBase64String(InputStream in) { //collect = new ByteArrayOutputStream(); ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte[] buf = new byte[1024]; try { for(int readNum; (readNum = in.read(buf)) != -1; ) { bos.write(buf, 0, readNum); } } catch (IOException ex) { Logger.getInstance()

Write XML in Base64 encoding

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问题 Following my questions about storing data, it has been suggested that I could use XML but then obfuscate the file by encoding it using Base64. I like this idea, and I have achieved what I want in XML, but I don't know how to save it in Base64. This is my code so far: XmlWriterSettings settings = new XmlWriterSettings(); settings.Indent = true; XmlWriter write = XmlWriter.Create("C:\\Users\\Andy\\Desktop\\database.xml", settings); write.WriteStartDocument(); write.WriteStartElement("Database")

uniapp安卓ios百度人脸识别、活体检测、人脸采集APP原生插件

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插件亮点 1 支持安卓平板（横竖屏均可），苹果的iPad。2 颜色图片均可更换。特别提醒此插件包含 android 端和 iOS 端，考虑到有些同学只做其中一个端的 app，特意分为 2 个插件，减小安装包体积。 android 端请点击这里。 iOS 端请点击这里。 1、前言最近在使用 uniapp 开发项目，有刷脸实名认证的需求，最终使用百度人脸识别实现了需求。自己做了个 APP 原生插件，给大家介绍下用法。本插件主要功能是通过动作检测活体，采集人脸返回。其他功能需要自主实现，如刷脸登录，实名认证等。 2、包名及签名证书准备包名安卓和 iOS 可填写一样的：com.longyoung.baidudemo（一般用反域名，如我的域名：www.longyong.com）。注意：uniapp 打包或者打基座要用这个包名。申请百度授权文件，需要用到安卓签名证书的 md5，如果你们公司有原生开发团队，问他们要即可。没有的话，自己生成一个签名证书并获取它的 md5，点击查看方法。注意：uniapp 打包或者打基座要用这个签名证书。 3、百度官方资料准备百度人脸识别申请授权文件步骤要领，点击查看方法。 4、接入步骤 4.1 在项目根目录创建文件夹 nativeplugins，购买插件（建议测试版本点击购买下方的试用，正式发布的时候再购买）。 4.2 将百度授权文件

uniapp安卓ios百度人脸识别、活体检测、人脸采集APP原生插件

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How to convert a png base64 string to pixel array without using canvas getImageData?

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问题 Although it seems that this question has been asked before, people rely on canvas for that conversion. The problem is going from a base64 url like this: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAcAAAAHCAYAAADEUlfTAAAAFElEQVQIW2NkYGD4D8RYAeOQkgQAERQHAbuZaGoAAAAASUVORK5CYII= to a pixel array with color intensities like this var array = [ [0x00,0x00,0x00], ... 49 times ]; for a 7px by 7px image (black in that case), we have to use code like this: var mCanvas = document.createElement(

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