filereader

Android: FileReader unexpectedly throwing FileNotFoundException

由 ぐ巨炮叔叔 提交于 2019-12-25 07:50:08
问题 So I'm unexpectedly receiving a FileNotFoundException. As you can see, shortly before I call the FileReader, I call FileInputStream which works fine. I've tried putting the FileReader in its own Try/Catch clause, but receive the same result. I've gutted most of the lines unnecessary to my question from this block. (Ultimately I call LineNumberReader as well, though I removed it from the block because I'm not even getting that far.) String FILENAME = "file.txt"; try { byte[] buffer = new byte

How do I append a file to FormData()?

由 浪尽此生 提交于 2019-12-25 06:33:45
问题 fd.append("upload", file) yields, ------WebKitFormBoundaryJnjpATRkxe2Duwwu Content-Disposition: form-data; name="userid" 8022171621665209152 ------WebKitFormBoundaryJnjpATRkxe2Duwwu Content-Disposition: form-data; name="upload"; filename="sample.csv" Content-Type: text/csv ------WebKitFormBoundaryJnjpATRkxe2Duwwu-- fd.append("upload", evt.target.result) yields, ------WebKitFormBoundaryITfVxS7FbNWfk3Ty Content-Disposition: form-data; name="userid" 8022171621665209152 -----

Can I use Javascript's FileReader on a local file if I know the location?

由 半腔热情 提交于 2019-12-25 05:18:08
问题 I am using JavaScript with FileReader and readAsDataURL so I can convert images to base64 code and then store and display the base64 image code at a later time. I have a button that works fine when I select a file with it, but my question is: How can I use only a url to a local file (something like C:\folder\image.gif) (without using the file input button) and create an image object from that local image file url to use with the FileReader readAsDataURL functions? If this is not possible with

read files names from directory without System files(.DS_Store)

由 ↘锁芯ラ 提交于 2019-12-25 04:26:42
问题 Im trying to read all filenames from a folder and save them in an array but im still reading all files (including the system folder .DS_Storefrom)so that my code doesn´t work for what i want to do. anyone knows how to read only non Systems files/folder? Thanks for the help! Here´s what i wrote, String pathLevel= "/Users/lan/Desktop/top/"; File file = new File(pathLevel); String [] levelNames = file.list(); String [] matrix= new String[levelNames.length]; 来源： https://stackoverflow.com

Checking if a customers name is already in a txt file with FileReader

由 ♀尐吖头ヾ 提交于 2019-12-25 02:26:25
问题 My problem is that I have to write code to check if a customers name is already in my txt file (Customers.txt). As you can see, I write my customers name ,every fourth line in my txt File. I would like to have the input of a customers name with SimpleInOutDialog en then that inputs needs to be compared with al the customers name in my txt file. How do I need to do this? The code that I already have is below. //make SimpleInOutDialog SimpleInOutDialog input = new SimpleInOutDialog("Customers")

IE之不完全罪状（持续更新）

由 大城市里の小女人 提交于 2019-12-24 22:37:25
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 开始之前先说点题外话。 如国内浏览器特别多，而且都是包壳。这些浏览器一般来讲为了保证浏览器兼容性都会默认使用webkit内核进行渲染，再特殊情况使用ie内核。 用过一些这样的浏览器都知道它是由急速模式和兼容模式，这就是在切换模式。如果你的项目中必须要使用webkit 或者ie10 etc内核渲染，那么可以加meta标签告诉浏览器，强制浏览器选择合适的渲染模式。看起来是这样的： <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 一 JS 1. XMLHttpRequest IE8的 XMLHttpRequest的对象大概是这样的 谷歌是这样的 他们其实有一定的差别的。 比如你使用了 xhr.response 。 毫无疑问就会报错 。 IE10+ 追加了这个属性 2.console 大家知道ie 10+ 是有console的。 对于之前的版本是没有console的。 要想使用大概要这样子： <!--[if lt IE 10]> <script src="https://as.alipayobjects.com/g/component/??console-polyfill/0.2.2/index.js,es5-shim/4.5.7/es5

JavaScript FileReader() and a possible return or closure issue

由 感情迁移 提交于 2019-12-24 21:51:47
问题 Finally, my first question here on stackoverflow. I can guarantee you that I have searched for related answers, but no one fits my problem. I am learning JavaScript now, having a background in .NET and C++, but I can't get this piece of code to do what I expect. I am copying here one of the many versions, with possible a questionable placement of the return statement, but maybe you can help me out with this. function readFile(file) { var reader = new FileReader(); reader.onload = readSuccess;

Java:IO流

由 柔情痞子 提交于 2019-12-24 20:06:09
对流进行分类 文件字节输入流（FlieInputStream）、文件字节输出流（FileOutputStream）、文件字符输入流（FileReader）、文件字符输出（FileWriter）. 学习IO流的三大步骤： 1.创建需要的IO流对象； 2.进行文件的读写操作； 3.关闭资源。 public static void main ( String [ ] args ) throws IOExcetion { FileInputStream fis = new FileInputStream ( "a.jpg" ) ; //创建文件字节输入流对象 FileOutputStream fos = new FileOutoutStream ( "b.jpg" ) ; //创建文件字节输出流对象 byte [ ] b = new byte [ 1024 ] ; //创建字节缓存区对象 int len ; while ( ( len = fis . read ( b ) ) ! - 1 ) { fos . writer ( b , 0 , len ) ; } fos . close ( ) ; //关闭资源，这里直接抛给JVM fis . close ( ) ; } public static void main ( String [ ] args ) throws

React/Javascript--FileReader/<input/>/adding image

由 前提是你 提交于 2019-12-24 19:14:37
问题 I am attempting to set up a default image on a prop that uses FileReader. I want the image to be loaded when the component mounts componentDidMount(){...} and to be used if the user decides not to upload an image. I have been unable to get this to work, please help. avatar is the image I want to use as a default. <ImageUpload /> uses base64url encoding to work. x.img initially is {} . I tried to call _handleImageChange and pass in avatar . I tried to use a defaultValue={avatar} on #profile

FileReader.readAsDataURL result returning format exception when entered in Convert.FromBase64String

由 三世轮回 提交于 2019-12-24 14:55:05
问题 I'm using the following to convert an image to a base64 encoded string. On the client website in javascript: var reader = new FileReader(); reader.onloadend = function () { data64 = reader.result; }; reader.readAsDataURL(myFile); Now I pass this data to the server, which does the following: var data = Convert.FromBase64String(data64); However this results in a format exception: The format of s is invalid. s contains a non-base-64 character, more than two padding characters, or a non-white
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