filereader

Illegal base64 character

由 雨燕双飞 提交于 2019-12-10 12:39:07
问题 I am trying uploading an image with this javascript code: var reader = new FileReader(); reader.onloadend = function() { var bytes = window.btoa(reader.result); var ext = file.name.split(".").pop(); xhr.send("bytes="+bytes+"&type="+ext); } reader.readAsBinaryString(file); where bytes is passed to this java code on the server side: public Integer upload(String bytes, String type) throws IOException { byte[] bytes_final = Base64.getDecoder().decode(bytes.split(",")[1]); BufferedImage src =

In phonegap File Reader is not reading the file by using the path getting by FILE_URI

由 爱⌒轻易说出口 提交于 2019-12-10 11:51:17
问题 I am new to to the developing phonegap application. I need to choose the picture from the photolibrary after that need to store the path of the selected picture in localStorage, still this i did using destinationType as FILE_URI then i need to call another function which helps to converting the selected picture into base64 string by using File Reader's property readAsDataURL and upload that string to the server. The first part is working fine but that second part is not working please help me

Can you read line by line in javascript?

由 ﹥＞﹥吖頭↗ 提交于 2019-12-10 10:53:43
问题 Is there any way to read a file line by line in javascript, specifically this file which is a dictionary. I was trying to build a replica of a java anagram solver I made a few months ago, but hit this problem of not being able to read a file line by line. I could download the file and store it locally if that would make any difference to being able to read it. 回答1: Use YQL: http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20html%20where%20url%3D%22http%3A%2F%2Fdocs.oracle.com

Is it possible to save a File object in LocalStorage and then reload a File via FileReader when a user comes back to a page?

由 和自甴很熟 提交于 2019-12-10 02:39:54
问题 For example, say the user loads some very large images or media files in to your web app. When they return you want your app to show what they've previously loaded, but can't keep the actual file data in LocalStorage because the data is too large. 回答1: This is NOT possible with localStorage . Data stored in localStorage needs to be one of the primitive types that can be serializable. This does not include the File object. For example, this will not work as you'd expect: var el = document

java中装饰者模式

由 跟風遠走 提交于 2019-12-09 23:08:35
java中装饰者模式 package com . company01 . Decorator ; public abstract class Reader { public abstract void close ( ) ; } package com . company01 . Decorator ; /* 需求：对FileReader类中close()方法进行扩展，并且不能改变FileReader 1.使用继承（但是关联性太强了，代码耦合度太高，不利于项目的扩展。）-->可以理解为 父子关系 2.这里介绍一种方法：装饰者模式。-->可以理解为朋友之间的关系 */ public class FileReader extends Reader { public void close ( ) { System . out . println ( "FileReader closed!" ) ; } } package com . company01 . Decorator ; /* 使用BufferedReader对FileReader中的close方法进行扩展 1.装饰者模式中要求：装饰者中含有被装饰者的引用 2.装饰者模式中要求：装饰者和被装饰者应该实现同一个接口或者类型。 */ public class BufferedReader extends Reader { //

input type="file" 多视频上传并且进行预览

由 折月煮酒 提交于 2019-12-09 16:06:11
直接上代码了，，简单粗暴点。 首先大家需要知道， accept 属性只能与 <input type="file"> 配合使用。它规定能够通过文件上传进行提交的文件类型。 如果不限制视频的格式，可以写为： accept="video/*" html代码 < input type = "file" id = "file" name = "file" onchange = "videoPreview(this)" / > < div class = "videoBox" id = "videoBox" > < / div > js代码 < script type = "text/javascript" > function videoPreview ( source ) { var file = source . files [ 0 ] ; console . log ( source . files ) ; if ( window . FileReader ) { var fr = new FileReader ( ) ; fr . onloadend = function ( e ) { var video = document . createElement ( "video" ) ; video . controls = "controls" ; video . src = e

How to implement Progress Bar and Callbacks with async nature of the FileReader

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-09 15:14:14
问题 I have the FileReader API called within a for loop to iterate through multiple file objects. I'm using FileReader to essentially display preview of images. function() { for (var i in Files) { var fileReader = new FileReader(); fileReader.readAsBinaryString(Files[i]); fileReader.onload = function() { // do something on FileReader onload } fileReader.onprogress = function(data) { if (data.lengthComputable) { var progress = parseInt( ((data.loaded / data.total) * 100), 10 ); console.log(progress

How to display a image selected from input type = file in reactJS

由 社会主义新天地 提交于 2019-12-09 06:03:03
问题 I'm trying to display a image selected from my computer in my web app. I referred the following question which addresses the question i'm trying to fix. How to display selected image without sending data to server? I have my html part like this <div className="add_grp_image_div margin_bottom"> <img src={img_upload} className="add_grp_image"/> <input type="file" className="filetype" id="group_image"/> <span className="small_font to_middle">Add group image</span> <img id="target"/> </div> I

Input file size and content do not update on macOS

由 对着背影说爱祢 提交于 2019-12-08 15:04:49
问题 I wrote a small web based tool, which uses a file input to read a constantly changing file. The user selects it manually (once!) and JavaScript tracks when it was changed (last file modification time and file size). If it has changed, it reads the file contents again. This works fine in all browsers on Windows. But on macOS (tested in Safari 10.1.2 and Firefox 51.0.1) only the last modification time seems to be updated. The file size is not updated and it seems, that the file contents cannot

Reading a PLY file from a specific string

由 醉酒当歌 提交于 2019-12-08 13:41:24
问题 I want to read a PLY file to a MATLAB matrix starting from the next line of the string end_header using the dlmread function as suggested in this SOF question. Sample PLY file is given here. Currently the starting line is hardcoded as follows, but it is not suitable as the number of header rows in a PLY file may change. data = dlmread(fileName, ' ', 14, 0); 回答1: There are a multitude off different ways you could do this. One option is to use textscan to read in the entire file and a mix of
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