blob

React-native - Populate image with Blob that has been converted to a URL

由 ￡可爱￡侵袭症＋ 提交于 2019-11-30 05:24:43
问题 I want to populate an image with a uri. I request the image from the server and it returns a BLOB. BLOB when displayed to console: I then convert the BLOB into a URL with the following line: var blobUrl = URL.createObjectURL(blob); blobUrl when displayed to console I then try and populate the Image with the URL: <Image source={{uri: blobURL}} style={{width: 100, height: 50}} /> The image will not display. What should I do? I am using the android emulator which is connected to the localhost.

Insert binary file in SQLite database with Python

由 ∥☆過路亽．° 提交于 2019-11-30 04:58:45
I'm trying to write a simple Python script that inserts .odt documents into an SQLite database. Here is what I have done so far, but it doesn't seem to work: f=open('Loremipsum.odt', 'rb') k=f.read() f.close() cursor.execute="INSERT INTO notes (note) VALUES ('%s')" %(sqlite.Binary(k)) cursor.close() conn.close() I don't get any error messages, but as far as I can see the record is not inserted. What am I doing wrong? Also, how can I extract the stored document back? Thanks! Not sure what is that sqlite.Binary you're using, but, anyway, here's a working example: import sqlite3 # let's just make

base64保存下载图片

由 坚强是说给别人听的谎言 提交于 2019-11-30 03:50:17
1 exportPng() { 2 let _this = this; 3 let option = _this.charts.getOption(); 4 5 console.log(option); 6 // 从echarts获取图片 7 let imgData = _this.charts.getDataURL({ 8 type: "png", 9 pixelRatio: 2, 10 backgroundColor: '#000', 11 excludeComponents: ['toolbox', 'dataZoom'], 12 }); 13 _this.downloadFile(`${_this.chartsData.name}.png`, imgData); 14 }, 15 // 下载 16 downloadFile(fileName, content) { 17 let aLink = document.createElement('a'); 18 let blob = this.base64ToBlob(content); //new Blob([content]); 19 20 let evt = document.createEvent("HTMLEvents"); 21 evt.initEvent("click", true, true);/

Download a blob from HTTP URL in IE 11

由 只谈情不闲聊 提交于 2019-11-30 03:41:06
问题 My page generates a URL like this: blob:http%3A//localhost%3A8383/568233a1-8b13-48b3-84d5-cca045ae384f , blob having file data. I am downloading this as a file in every browser except IE 11. How can I download this blob in IE 11? A new tab get open and continuous refreshing happen. var file = new Blob([data], { type: 'application/octet-stream' }); var reader = new FileReader(); reader.onload = function (e) { var text = reader.result; } reader.readAsArrayBuffer(file); var fileURL = URL

How to convert iTextPDF Document to Byte Array

由 ぃ、小莉子 提交于 2019-11-30 03:18:52
问题 I need to convert iTextPDF Document file to byte[] after it's created in memory . I have already tested that I've no problem with creating PDF properly. The problem is how to convert it to byte array to store in DB. Here's my code: Document generatedDocument = reportService.generateRequestForm(scdUser, jsonObject, 0, null); reportService.generateRequestForm(scdUser, jsonObject, 0, null); ByteArrayOutputStream baos = new ByteArrayOutputStream(); PdfWriter pdfWriter = PdfWriter.getInstance

MYSQL中数据类型介绍

由 房东的猫 提交于 2019-11-30 02:57:37
一、MySQL的数据类型 主要包括以下五大类： 整数类型：BIT、BOOL、TINY INT、SMALL INT、MEDIUM INT、 INT、 BIG INT 浮点数类型：FLOAT、DOUBLE、DECIMAL 字符串类型：CHAR、VARCHAR、TINY TEXT、TEXT、MEDIUM TEXT、LONGTEXT、TINY BLOB、BLOB、MEDIUM BLOB、LONG BLOB 日期类型：Date、DateTime、TimeStamp、Time、Year 其他数据类型：BINARY、VARBINARY、ENUM、SET、Geometry、Point、MultiPoint、LineString、MultiLineString、Polygon、GeometryCollection等 1、整型 MySQL数据类型 含义（有符号） tinyint(m) 1个字节 范围(-128~127) smallint(m) 2个字节 范围(-32768~32767) mediumint(m) 3个字节 范围(-8388608~8388607) int(m) 4个字节 范围(-2147483648~2147483647) bigint(m) 8个字节 范围(+-9.22*10的18次方) 取值范围如果加了unsigned，则最大值翻倍，如tinyint unsigned的取值范围为

Displaying binary file (pdf) in IE 11

由 不羁的心 提交于 2019-11-30 02:03:55
问题 I am trying to display a binary file using the method suggested in this post AngularJS: Display blob (.pdf) in an angular app. This is working nicely in Chrome and FF, but IE 11 is giving me "Error: Access Denied". Does anyone know if it has something to do with the Blob object and can point me in the right direction? Here is my js code: $http.get(baseUrl + apiUrl, { responseType: 'arraybuffer' }) .success(function (response) { var file = new Blob([response], { type: 'application/pdf' }); var

spring+hibernate的clob大字段处理

由 ￡可爱￡侵袭症＋ 提交于 2019-11-30 00:39:06
在spring中如何处理oracle大字段 在spring中采用OracleLobHandler来处理oracle大字段（包括clob和blob），则在程序中不需要引用oracle的特殊类，从而能够保证支持我们的代码支持多数据库。 所以在Spring的主配置文件xx.xml中的配置SessionFactory的bean中配置： <bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.CommonsDbcpNativeJdbcExtractor" lazy-init="true" autowire="default" dependency-check="default"/> <bean id="oracleLobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler" lazy-init="true" autowire="default" dependency-check="default"> <property name="nativeJdbcExtractor" ref="nativeJdbcExtractor"/> </bean> <bean id="sessionFactory"

Writing blob from SQLite to file using Python

由 三世轮回 提交于 2019-11-30 00:34:21
A clueless Python newbie needs help. I muddled through creating a simple script that inserts a binary file into a blog field in a SQLite database: import sqlite3 conn = sqlite3.connect('database.db') cursor = conn.cursor() input_note = raw_input(_(u'Note: ')) input_type = 'A' input_file = raw_input(_(u'Enter path to file: ')) with open(input_file, 'rb') as f: ablob = f.read() f.close() cursor.execute("INSERT INTO notes (note, file) VALUES('"+input_note+"', ?)", [buffer(ablob)]) conn.commit() conn.close() Now I need to write a script that grabs the contents of the blob field of a specific

前端图片canvas，file，blob，DataURL等格式转换

由 天大地大妈咪最大 提交于 2019-11-29 22:22:35
From: https://www.cnblogs.com/xkloveme/p/10967852.html 将file转化成base64 方法一：利用URL.createObjectURL() 1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title>base</title> 5 </head> 6 <body> 7 <input type="file" name="" id="file"> 8 <img src="" id="img"> 9 <script type="text/javascript"> 10 window.onload = function () { 11 let $img = document.getElementById('img') 12 file.onchange = function (e) { 13 console.log(e.target.files[0]) 14 let file = e.target.files[0] 15 let fileUrl = window.URL.createObjectURL(file) 16 $img.src = fileUrl 17 img.onload = function () { 18 // 手动回收 19 URL.revokeObjectURL(fileUrl) 20 }
订阅 blob