blob | 易学教程

Using JavaScript to display a Blob

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I am retrieving a Blob image from a database, and I'd like to be able to view that image using JavaScript. The following code produces a broken image icon on the page: var image = document.createElement('image'); image.src = 'data:image/bmp;base64,'+Base64.encode(blob); document.body.appendChild(image); Here is a jsFiddle containing all the code required, including the blob. The completed code should properly display an image. You can also get BLOB object directly from XMLHttpRequest. Setting responseType to blob makes the trick. Here is my code: var xhr = new XMLHttpRequest(); xhr.open("GET",

How to DEFLATE with a command line tool to extract a git object?

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I'm looking for a command line wrapper for the DEFLATE algorithm. I have a file (git blob) that is compressed using DEFLATE, and I want to uncompress it. The gzip command does not seem to have an option to directly use the DEFLATE algorithm, rather than the gzip format. Ideally I'm looking for a standard Unix/Linux tool that can do this. edit: This is the output I get when trying to use gzip for my problem: $ cat .git/objects/c0/fb67ab3fda7909000da003f4b2ce50a53f43e7 | gunzip gzip: stdin: not in gzip format UPDATE: Mark Adler noted that git blobs are not raw DEFLATE streams, but zlib streams.

How do we download a blob url video [closed]

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问题 I want to download a video whose url is not simple mp4 file, but its url is blob type for eg. <video id="playerVideo" width="450px" autoplay="autoplay" height="338px" style="height:100%;width:100%;" class="mejs-rai-e" src="blob:http://www.example.com/d70a74e1-0324-4b9f-bad4-84e3036ad354"> </video> Is there any chrome extension or software which can be used to download the playing video. 回答1: I just came up with a general solution, which should work on most websites. I tried this on Chrome

What's the best way to display an image from a sql server database in asp.net?

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问题 I have a sql server database that returns byte for the image. If I use the tableadapter wizard and set it to my stored procedure and preview data, it pulls back an image. It automatically turns it into an image in the preview data. I don't see it as a string of Ints or anything. How can I display it on my asp.net webpage with a gridview and objectdatasource? I have searched and foudn where the imagefield can point to a url on another page that does the byte transformation but I'm not sure it

Returning a blob with json

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问题 I'm trying to create a rest service for my android application where an external database returns items to be stored in the applications local database. I've got everything working except blobs are being returned as null. this is an example of my jason response.(picture and thumbnail fields are blobs) {"id":"2","user_id":"1","name":"testing","type":"bouldering","picture":null,"lat":"36","long":"81","alt":"41932","accuracy":"53","thumbnail":null} Here is my php script to return the data. <?php

java 如何设置.mp4的文件链接为blob:http://加密的格式

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前台代码 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gbk"> </head> <body> <h2>blob video demo</h2> <video id="sound" width="500" height="300" controls="controls"></video> <script type="text/javascript"> //创建XMLHttpRequest对象 var xhr = new XMLHttpRequest(); //配置请求方式、请求地址以及是否同步 xhr.open(

How do i store and retrieve a blob from sqlite

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I have used sqlite in c++, python and now (perhaps) in C#. In all of these i have no idea how to insert a blob into a table. How do i store and retrieve a blob in sqlite? Here's how you can do it in C#: class Program { static void Main(string[] args) { if (File.Exists("test.db3")) { File.Delete("test.db3"); } using (var connection = new SQLiteConnection("Data Source=test.db3;Version=3")) using (var command = new SQLiteCommand("CREATE TABLE PHOTOS(ID INTEGER PRIMARY KEY AUTOINCREMENT, PHOTO BLOB)", connection)) { connection.Open(); command.ExecuteNonQuery(); byte[] photo = new byte[] { 1, 2, 3,

Display image from blob using javascript and websockets

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问题 I\'m currently working on a WebSocket application that is displaying images send by a C++ server. I\'ve seen a couple of topics around there but I can\'t seem to get rid of this error in Firefox: Image corrupt or truncated: data:image/png;base64,[some data] Here\'s the Javascript code I\'m using to display my blob: socket.onmessage = function(msg) { var blob = msg.data; var reader = new FileReader(); reader.onloadend = function() { var string = reader.result; var buffer = Base64.encode(string

What is the maximum length of data I can put in a BLOB column in MySQL?

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What is the maximum length of data I can put in a BLOB column in MySQL? WhiteFang34 A BLOB can be 65535 bytes (64 KB) maximum. If you need more consider using: a MEDIUMBLOB for 16777215 bytes (16 MB) a LONGBLOB for 4294967295 bytes (4 GB). See Storage Requirements for String Types for more info. Tieson T. May or may not be accurate, but according to this site: http://www.htmlite.com/mysql003.php . BLOB A string with a maximum length of 65535 characters. The MySQL manual says: The maximum size of a BLOB or TEXT object is determined by its type, but the largest value you actually can transmit

Convert blob URL to normal URL

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My page generates a URL like this: "blob:http%3A//localhost%3A8383/568233a1-8b13-48b3-84d5-cca045ae384f" How can I convert it to a normal address? I'm using it as an <img> 's src attribute. Jeremy Banks A URL that was created from a JavaScript Blob can not be converted to a "normal" URL. A blob: URL does not refer to data the exists on the server, it refers to data that your browser currently has in memory, for the current page. It will not be available on other pages, it will not be available in other browsers, and it will not be available from other computers. Therefore it does not make