filereader

Upload very large files(>5GB)

由 牧云@^-^@ 提交于 2020-01-14 10:37:30
问题 I need your help. I want to create a upload script with HTML, JQuery and PHP. Is it possible to write a script, that can upload very large files(> 5 GB)? I've try it with FileReader, FormData and Blobs, but even with these, i can't upload large files(my browser crashes after selecting a large file). PS: I want to write it myself. Don't post any finished scripts. Regards 回答1: Yes. I wrote PHP to upload file exactly 5GB more then one year ago. FileReader, FormData and Blobs will fail because

Pass file reader data to service in Angular Js

由 五迷三道 提交于 2020-01-14 05:56:27
问题 I am using file reader to fetch the data of file upload. I am able to get the data in controller.js, but not able to pass it to the API service. The data is always passed as empty. I have updated the code as below: //index.cshtml <input type="file" my-files="files" /> <input type="button" name="imageUploadButton" ng-click="uploadFiles()" value="Upload" /> // controller.js angular.module('myApp.controllers', []). controller('AppController', function($scope, testAPIService, Excel, $timeout,

File object to image with correct file name instead of src=“blob…”

由 岁酱吖の 提交于 2020-01-13 10:15:05
问题 I have a File object myFile that looks like this in console: File { name: "myimage.jpg", lastModified: 1465476925001, lastModifiedDate: Thu Jun 09 2016 14:55:25 GMT+0200 (CEST), size: 33002 type: "image/jpeg" } But when i create an image out of it with var image = new Image(); image.src = URL.createObjectURL(myFile); I get: <img src="blob:http://myurl.com/6b2b83d8-ac36-40c1-8ab1-c4f07b019ba5"> When i try to save the file with right-click, the file-name is empty or "6b2b83d8-ac36-40c1-8ab1

File object to image with correct file name instead of src=“blob…”

由 十年热恋 提交于 2020-01-13 10:14:05
问题 I have a File object myFile that looks like this in console: File { name: "myimage.jpg", lastModified: 1465476925001, lastModifiedDate: Thu Jun 09 2016 14:55:25 GMT+0200 (CEST), size: 33002 type: "image/jpeg" } But when i create an image out of it with var image = new Image(); image.src = URL.createObjectURL(myFile); I get: <img src="blob:http://myurl.com/6b2b83d8-ac36-40c1-8ab1-c4f07b019ba5"> When i try to save the file with right-click, the file-name is empty or "6b2b83d8-ac36-40c1-8ab1

Using $(this) with FileReader() to target result

由 假装没事ソ 提交于 2020-01-12 03:54:27
问题 I'm trying to show an ajax preview of an image from a file input. Easy enough using FileReader() but I'm using it with a loop so I when it's time to place the result inside an image source, I need to use $(this) to target the loop item of the input. That doesn't even make sense to me so here we go. We have a loop.. <li> <input type="file" class="image" /> <img src="" class="preview" /> </li> <li> <input type="file" class="image" /> <img src="" class="preview" /> </li> <li> <input type="file"

Reading from files passed as command line arguements

由 寵の児 提交于 2020-01-11 10:49:43
问题 I am trying to parse a given textfile, but so far, my program does not seem to be reading properly. #include <stdio.h> int main(int argc, char *argv[]) { FILE *fr; //file pointer int buildingFloors = 1; printf("sanity check\n"); fr = fopen (argv[0], "r"); fscanf(fr, "%d", &buildingFloors ); printf("%d\n", buildingFloors); fclose(fr); return 0; } I compile the program and run it on my redhat linux machine with the following command: ./sjf file.text file.text is a text document with a "4" as

文件上传之验证后缀与内容是否一致

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-01-11 06:22:32
在上传前验证，开发者们往往喜欢通过后缀或者 File.type() 去判断一个文件类型来决定是否符合上传要求。但这显然是不可靠的，当被别有用心的人利用后，就可能在服务器被执行。今天就来解决如何在前端验证文件内容跟后缀是否一致。 1. Magic number 既然要解析文件内容那这个 Magic Number 就很关键 => Magic number：即幻数，它可以用来标记文件或者协议的格式，很多文件都有幻数标志来表明该文件的格式。 以下是常见的文件头： 文件类型 文件头(16 进制) JPEG (jpg) FFD8FF JPEG (jpg) FFD8FF PNG (png) 89504E47 GIF (gif) 47494638 TIFF (tif) 49492A00 Windows Bitmap (bmp) 424D CAD (dwg) 41433130 Adobe Photoshop (psd) 38425053 Rich Text Format (rtf) 7B5C727466 XML (xml) 3C3F786D6C HTML (html) 68746D6C3E Adobe Acrobat (pdf) 255044462D312E Email (eml) 44656C69766572792D646174653A Outlook Express (dbx)

FileReader to String

由 风格不统一 提交于 2020-01-11 05:45:12
问题 Consider the following code function readSingleFile(evt) { //Retrieve the first (and only!) File from the FileList object var myFile = evt.target.files[0]; var reader = new FileReader(); reader.readAsText(myFile); var myString = reader.toString(); alert(myString); // print - "[object FileReader]" } I try to get all the file content into String , for example if the file content is helloWorld1 helloWorld2 I will get alert of that's content . 回答1: That's not how you get the result of a

How can I test a change handler for a file-type input in React using Jest/Enzyme?

由 ￡可爱￡侵袭症＋ 提交于 2020-01-09 19:02:10
问题 I want to test whether my React component can use FileReader to import the contents of a user-selected file from an <input type="file"/> element. My code below shows a working component with a broken test. In my test I'm attempting to use a blob as a substitute for the file because blobs can also be "read" by FileReader . Is that a valid approach? I also suspect that part of the issue is that reader.onload is asynchronous and that my test needs to take this into consideration. Do I need a

How can I test a change handler for a file-type input in React using Jest/Enzyme?

由 梦想与她 提交于 2020-01-09 19:01:47
问题 I want to test whether my React component can use FileReader to import the contents of a user-selected file from an <input type="file"/> element. My code below shows a working component with a broken test. In my test I'm attempting to use a blob as a substitute for the file because blobs can also be "read" by FileReader . Is that a valid approach? I also suspect that part of the issue is that reader.onload is asynchronous and that my test needs to take this into consideration. Do I need a
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