blob

Display a video from a Blob Javascript

由 最后都变了- 提交于 2019-12-17 15:22:38
问题 I would like to display a video from a Javascript Blob/File object in the HTML5 video tag. This code only works for small videos : var reader = new FileReader(); reader.onload = function(e) { document.getElementById("video").src=reader.result; } reader.readAsDataURL(vid); I cannot use this for big videos (> 10MB). Is there a solution to display a big video from a blob object in HTML 5? 回答1: I've found. It was so simple that I didnt even see it... function display(vid){ var video = document

vue 导出Excel／zip

由 房东的猫 提交于 2019-12-17 13:45:32
1 安装依赖 npm i jszip -S ／／安装zip 　　 npm install -S file-saver xlsx npm install -D script-loader 2 再项目中创建文件夹 src 下创建（vendor） 放入 两个文件 里面放置两个文件Blob.js和 Export2Excel.js Export2Zip.js （zip） 3. 导入 export2Excel， 　　 再build 文件夹下 webpack.base.conf.js 　　 'vendor': path.resolve(__dirname, '../src/vendor') 　4. 调用 　　 导出excel zip_down(){ this.downloadLoading = true require.ensure([], () => { const { export_json_to_excel } = require('@/vendor/Export2Excel') const tHeader = ['序号'] const filterVal = ['name'] const list = this.tableData //导入数据 const data = this.formatJson(filterVal, list) export_json_to_excel

Record 5 seconds segments of audio using MediaRecorder and then upload to the server

由 感情迁移 提交于 2019-12-17 13:28:11
问题 I want to record user's microphone 5 seconds long segments and upload each to the server. I tried using MediaRecorder and I called start() and stop() methods at 5 seconds time interval, but when I concatenate these recordings there is a "drop" sound between. So I tried to record 5 seconds segments using timeslice parameter of start() method: navigator.mediaDevices.getUserMedia({ audio: { channelCount: 2, volume: 1.0, echoCancellation: false, noiseSuppression: false } }).then(function(stream)

Record 5 seconds segments of audio using MediaRecorder and then upload to the server

由 倾然丶 夕夏残阳落幕 提交于 2019-12-17 13:27:17
问题 I want to record user's microphone 5 seconds long segments and upload each to the server. I tried using MediaRecorder and I called start() and stop() methods at 5 seconds time interval, but when I concatenate these recordings there is a "drop" sound between. So I tried to record 5 seconds segments using timeslice parameter of start() method: navigator.mediaDevices.getUserMedia({ audio: { channelCount: 2, volume: 1.0, echoCancellation: false, noiseSuppression: false } }).then(function(stream)

Easiest way to convert a Blob into a byte array

由 僤鯓⒐⒋嵵緔 提交于 2019-12-17 09:10:04
问题 what is the easiest way to convert a Blob into a byte array?I am using MYSQL and i want to convert a Blob datatype into a byte array. Iam using java programming language:) 回答1: the mySql blob class has the following function : blob.getBytes use it like this: //(assuming you have a ResultSet named RS) Blob blob = rs.getBlob("SomeDatabaseField"); int blobLength = (int) blob.length(); byte[] blobAsBytes = blob.getBytes(1, blobLength); //release the blob and free up memory. (since JDBC 4.0) blob

Easiest way to convert a Blob into a byte array

由 血红的双手。 提交于 2019-12-17 09:09:55
问题 what is the easiest way to convert a Blob into a byte array?I am using MYSQL and i want to convert a Blob datatype into a byte array. Iam using java programming language:) 回答1: the mySql blob class has the following function : blob.getBytes use it like this: //(assuming you have a ResultSet named RS) Blob blob = rs.getBlob("SomeDatabaseField"); int blobLength = (int) blob.length(); byte[] blobAsBytes = blob.getBytes(1, blobLength); //release the blob and free up memory. (since JDBC 4.0) blob

What are the differences between the BLOB and TEXT datatypes in MySQL?

由 北战南征 提交于 2019-12-17 07:08:03
问题 What is blob and what is text ? What are the differences? When do I need to use blob and when do I need text as data type? Because for blob and text , there are mediumblob == mediumtext , smallblob == small text . Do they even have the same meaning? And look at this MEDIUMBLOB , MEDIUMTEXT L + 3 bytes, where L < 224 . What is L ? 回答1: TEXT and CHAR will convert to/from the character set they have associated with time. BLOB and BINARY simply store bytes. BLOB is used for storing binary data

Spring, Hibernate, Blob lazy loading

由 无人久伴 提交于 2019-12-17 06:36:20
问题 I need help with lazy blob loading in Hibernate. I have in my web application these servers and frameworks: MySQL, Tomcat, Spring and Hibernate. The part of database config. <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <property name="driverClass" value="${jdbc.driverClassName}"/> <property name="jdbcUrl" value="${jdbc.url}"/> <property name=

JS 粘贴展示图片并读取图片

由 你离开我真会死。 提交于 2019-12-17 05:33:45
主要是通过给div绑定粘贴事件 div.addEventListener('paste', function(){}) 粘贴事件 核心代码 (最下面有完整代码) const div = document.getElementById("div") const img = document.getElementById("img") div.addEventListener('paste', handlepaste) function handlepaste(e) { // 粘贴对象 if (e.clipboardData || e.originalEvent) { const clipboardData = (event.clipboardData || event.originalEvent.clipboardData); if (clipboardData.items) { let blob; for (let i = 0; i < clipboardData.items.length; i++) { if (clipboardData.items[i].type.indexOf('image') !== -1) { blob = clipboardData.items[i].getAsFile(); } } // 粘贴数据 console.log(blob, 'blob')

Retrieve an Image stored as BLOB on a MYSQL DB

由 孤街浪徒 提交于 2019-12-17 04:57:31
问题 I'm trying to create a PDF based on the information that resides on a database. Know I need to retrieve a TIFF image that is stored as a BLOB on a mysql database from Java. And I don't know how to do it. The examples I've found shows how to retrieve it and save it as a File (but on disk) and I needed to reside on memory. Table name: IMAGENES_REGISTROS BLOB Field name: IMAGEN Any Ideas? 回答1: On your ResultSet call: Blob imageBlob = resultSet.getBlob(yourBlobColumnIndex); InputStream
订阅 blob