blob | 易学教程

PDF Blob is not showing content, Angular 2

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问题 I have problem very similar to this PDF Blob - Pop up window not showing content, but I am using Angular 2. The response on question was to set responseType to arrayBuffer, but it not works in Angular 2, the error is the reponseType does not exist in type RequestOptionsArgs. I also tried to extend it by BrowserXhr, but still not work (https://github.com/angular/http/issues/83). My code is: createPDF(customerServiceId: string) { console.log("Sending GET on " + this.getPDFUrl + "/" +

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

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问题 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

How do i store and retrieve a blob from sqlite

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问题 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? 回答1: 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,

How to convert Blob to File in JavaScript

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问题 I need to upload an image to NodeJS server to some directory. I am using connect-busboy node module for that. I had the dataURL of the image that I converted to blob using the following code: dataURLToBlob: function(dataURL) { var BASE64_MARKER = ';base64,'; if (dataURL.indexOf(BASE64_MARKER) == -1) { var parts = dataURL.split(','); var contentType = parts[0].split(':')[1]; var raw = decodeURIComponent(parts[1]); return new Blob([raw], {type: contentType}); } var parts = dataURL.split(BASE64

Convert blob URL to normal URL

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问题 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. 回答1: 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

I need my PHP page to show my BLOB image from mysql database

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问题 So my last question was on how to have my techID shown from a search : I am trying to have my "Details" page to reference two seperate parts of my server that are linked via techID My new question is still on this page. I have added in an echo image as well. but am having trouble using Blob and having it display my image and not binary JPEG data. I've been trying to find another instance of this but cannot find any that fix my error. //Header ('Content-type: image/jpeg') echo "<dt><strong

【前端知乎系列】ArrayBuffer 和 Blob 对象

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 本文首发在我的【个人博客】更多丰富的前端学习资料，可以查看我的 Github : 《Leo-JavaScript》，内容涵盖数据结构与算法、 HTTP 、 Hybrid 、面试题、 React 、 Angular 、 TypeScript 和 Webpack 等等。点个 Star 不迷路~ ArrayBuffer 对象与 Blob 对象大家或许不太陌生，常见于文件上传操作处理（如处理图片上传预览等问题）。那么本文将与大家深入介绍两者。一、ArrayBuffer 对象 ArrayBuffer 对象是 ES6 才纳入正式 ECMAScript 规范，是 JavaScript 操作二进制数据的一个接口。 ArrayBuffer 对象是以数组的语法处理二进制数据，也称二进制数组。介绍 ArrayBuffer 对象还需介绍 TypedArray 视图和 DataView 视图，本文不具体介绍，详细可以查看阮一峰老师《ECMAScript 6 入门 ArrayBuffer》章节。 1. 概念介绍 ArrayBuffer 对象代表储存二进制数据的一段内存，它不能直接读写，只能通过视图（ TypedArray 视图和 DataView 视图）来读写，视图的作用是以指定格式解读二进制数据。关于

MySQL 数据类型

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MySQL中定义数据字段的类型对你数据库的优化是非常重要的。 MySQL支持多种类型，大致可以分为三类：数值、日期/时间和字符串(字符)类型。数值类型 MySQL支持所有标准SQL数值数据类型。这些类型包括严格数值数据类型(INTEGER、SMALLINT、DECIMAL和NUMERIC)，以及近似数值数据类型(FLOAT、REAL和DOUBLE PRECISION)。关键字INT是INTEGER的同义词，关键字DEC是DECIMAL的同义词。 BIT数据类型保存位字段值，并且支持MyISAM、MEMORY、InnoDB和BDB表。作为SQL标准的扩展，MySQL也支持整数类型TINYINT、MEDIUMINT和BIGINT。下面的表显示了需要的每个整数类型的存储和范围。日期和时间类型表示时间值的日期和时间类型为DATETIME、DATE、TIMESTAMP、TIME和YEAR。每个时间类型有一个有效值范围和一个"零"值，当指定不合法的MySQL不能表示的值时使用"零"值。 TIMESTAMP类型有专有的自动更新特性，将在后面描述。字符串类型字符串类型指CHAR、VARCHAR、BINARY、VARBINARY、BLOB、TEXT、ENUM和SET。该节描述了这些类型如何工作以及如何在查询中使用这些类型。 CHAR 和 VARCHAR 类型类似

.net解决大文件断点续传

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以ASP.NET Core WebAPI 作后端 API ，用 Vue 构建前端页面，用 Axios 从前端访问后端 API ,包括文件的上传和下载。准备文件上传的API #region 文件上传可以带参数 [HttpPost("upload")] public JsonResult uploadProject(IFormFile file, string userId) { if (file != null) { var fileDir = "D:\\aaa"; if (!Directory.Exists(fileDir)) { Directory.CreateDirectory(fileDir); } //文件名称 string projectFileName = file.FileName; //上传的文件的路径 string filePath = fileDir + $@"\{projectFileName}"; using (FileStream fs = System.IO.File.Create(filePath)) { file.CopyTo(fs); fs.Flush(); } return Json("ok"); }else{ return Json("no"); } } #endregion 前端vue上传组件 ( 利用Form表单上传 )

git 修改文件权限

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git 修改文件权限问题分析 Windows 下的文件是否可执行是由扩展名决定的，但是linux下是否可执行是文件的可执行属性决定的。有时候windows 下开发写的脚本程序，提交的git 仓库中时就有可执行权限，以便在linux和macOS上克隆下来就能直接执行。如果在linux下就先添加可执行权限后commit和push，如果在windows下就需要通过git命令修改了。解决方法： 1. 查看文件权限 $ git ls-tree HEAD 100644 blob d116ef8f223343c3425ff48c83e82fee60ff7e31 .gitignore 100644 blob 5627c82972a898248d36da3933bc4195865d7014 README.en.md 100644 blob 828b1b40d264cdbd9dea4f5178e14de0559e0d3e README.md 040000 tree a6db25934db55524d03f67f5901cc74308974ba6 g 100644 blob 06d39d8eacc78062af472cbfa40e819c9308d769 go.mod 100644 blob 25feac03517d5e29ca46d53d032ac0edffe447b9 go.sum

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