base64

图片转base64上传，视频同理。

由 自古美人都是妖i 提交于 2019-12-29 22:07:27
body: <input type=" file" id=" img" type=" file" onchange=" up()" style=" width: 100%;height: 100%;position:absolute ;top: 0;left:0;opacity: 0;"> js: imgData=''; code=26; function up(){ var img=document.getElementById('img'); var imgFile = new FileReader(); imgFile.readAsDataURL(img.files[0]); imgFile.onload = function () { imgData = this.result; //base64数据 // imgShow.setAttribute('src', imgData); // conte.value = imgData; if(imgData){ zp='1' //$api.dom('#xzzp').setAttribute("src",ret.base64Data) document.getElementById('xzzp').setAttribute("src",imgData) } } } 来源： https://www.cnblogs.com

How to decode base64-encoded font information?

由 老子叫甜甜 提交于 2019-12-29 11:38:36
问题 I encountered a website which used encoded font information. I tried to convert this encoded font to a binary file through the Base64 Endoder/Decoder Web service, but I couldn't find out what is the format of the resulting file. Here is the encoded CSS content (the content is too big to be copied/paste here). Thanks! [EDIT] Please don't speculate on what I want to do. I am asking questions about how the base64 code has been forged and what I am missing to be able to reverse the process, which

javascript 使用btoa和atob来进行Base64转码和解码

由 こ雲淡風輕ζ 提交于 2019-12-29 09:07:12
老是记不住这两个函数，干脆写下来，比较好翻。 avascript原生的api本来就支持,Base64,但是由于之前的javascript局限性，导致Base64基本中看不中用。当前html5标准正式化之际，Base64将有较大的转型空间,对于Html5 Api中出现的如FileReader Api, 拖拽上传,甚至是Canvas,Video截图都可以实现。 好了，前言说了一大堆，开发者需要重视： 一.我们来看看，在javascript中如何使用Base64转码 var str = 'javascript'; window.btoa(str) //转码结果 "amF2YXNjcmlwdA==" window.atob("amF2YXNjcmlwdA==") //解码结果 "javascript" 二.对于转码来说，Base64转码的对象只能是字符串，因此来说，对于其他数据还有这一定的局限性，在此特别需要注意的是对Unicode转码。 var str = "China，中国" window.btoa(str) Uncaught DOMException: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range. 很明显

Stream decoding of Base64 data

由 不羁的心 提交于 2019-12-29 08:52:22
问题 I have some large base64 encoded data (stored in snappy files in the hadoop filesystem). This data was originally gzipped text data. I need to be able to read chunks of this encoded data, decode it, and then flush it to a GZIPOutputStream. Any ideas on how I could do this instead of loading the whole base64 data into an array and calling Base64.decodeBase64(byte[]) ? Am I right if I read the characters till the '\r\n' delimiter and decode it line by line? e.g. : for (int i = 0; i < byteData

Soap - base64binary data in PHP

由 蹲街弑〆低调 提交于 2019-12-29 08:33:12
问题 I have a SOAP client in PHP that makes calls to a WSDL service. One of the functions returns a base64binary data. I've been trying to decode it without any luck. base64_decode($encoded_base64data) will not work. I tried using base_convert() and mv_convert_encoding() with various parameters, but could not get a proper result. The encoded result data starts with: ��`I�%&/m�{J�J��t��`$ؐ@�������iG#)�*��eVe]f@�흼��{����{����;�N'���?\fdl��J�ɞ!���?~|?" (the data is much longer, this is just a small

How to encode file of any type into base64 string and then decode it into file again using Lazarus/Delphi?

由 ℡╲_俬逩灬. 提交于 2019-12-29 08:19:11
问题 Can you tell me how can I do that? Is there any Freepascal unit that can do this for me? I need that so my program can store binary data in it's XML-based fileformat. 回答1: Use the base64 unit and its two classes, TBase64EncodingStream and TBase64DecodingStream . Here is a simple example: program demo; uses Classes, base64; var DecodedStream: TStringStream; EncodedStream: TStringStream; Encoder: TBase64EncodingStream; Output: string; begin DecodedStream := TStringStream.Create('Hello World!');

Convert Base64 to PNG/JPEG file in R

由 霸气de小男生 提交于 2019-12-29 07:09:27
问题 I have seen the process to convert a png file to base64 work in the post below Convert R image to Base 64 I would like to do the exact opposite of what you did. I have a base64 of a image stored in a variable "capimg" and now I want to convert it into a png or jpeg file. Can you help me reverse engineer the process. Is this doable? I have seen this done using php like below but I need a R script to do the same <?php $data = urldecode($_POST['imageData']); list($type, $data) = explode(';',

Convert an image to canvas that is already loaded

由 偶尔善良 提交于 2019-12-29 05:36:19
问题 I am working on a plugin in which I'm converting Image into Canvas and storing as data url .This function triggers on 'load' event but how can I convert an image which is already there on the page? (Don't want to refresh the page or load any image again). I tried using the Filereader() function but that also works on 'onload' concept. So how can I save the image as data url when the user clicks on the image? image.addEventListener("load", function () { var imgCanvas = document.createElement(

python基于万象优图识别图片中的中文

由 点点圈 提交于 2019-12-28 20:56:17
最近一直在研究光学字符识别，即OCR。最开始在谷爹那里了解到了开源的Tesseract，可以拿来识别简单的英文和数字。但是识别中文的准确率并不高。 然后从Tesseract到Tesseract.js，经过多次尝试研究，最后发现腾讯爹的万象优图识别率是最高的。趁现在是公测免费期，赶紧尝试了一把。 下面来说一说我是怎么用python实现中文识别的。 首先百度万象优图登录吧，腾讯的。。。你们懂得。。。。进去后，创建一个bucket，然后可以选择上传图片 这些准备工作做好以后，就开始写代码吧 首先如果是识别身份证，名片，标签等图片的话，强烈建议直接使用万象优图提供python sdk，详情请见https://cloud.tencent.com/document/product/460/7991 我们这里，是做图片通用印刷体识别，所以就只有被迫用万象优图提供的API：（原本我是更喜欢用SDK的，因为简单，但是目前SDK不支持） 万象优图OCR接口采用http协议，支持指定图片URL和 上传本地图片文件两种方式。 根据用户提供的图片，返回识别出的字段信息。 接口： http://recognition.image.myqcloud.com/ocr/general 这里有三点需要注意： (1) 每个请求的包体大小限制为6MB。 (2) 所有接口都为POST方法。 (3) 不支持

converting audio file to base64 using javascript

由 佐手、 提交于 2019-12-28 18:14:09
问题 I want to convert audio file into base64 using Javascript only. We can convert images into base64 using canvas. But how can we convert audio files. Any help will be grateful. 回答1: you can give the below code a try, it uses btoa function getData(audioFile, callback) { var reader = new FileReader(); reader.onload = function(event) { var data = event.target.result.split(',') , decodedImageData = btoa(data[1]); // the actual conversion of data from binary to base64 format callback
订阅 base64