connect | 易学教程

android ble connect slowly

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问题 Hi I'm writing an Android app to connect to a BLE peripheral device. Android 4.4.2, Galaxy Nexus. I have an LED on the device to indicate connection state. The issue is the duration from connectGatt() call to the point of receiving onConnectionStateChange STATE_CONNECTED are so inconsistent. Some time it is very quick but most of the time it takes 5s or more. Turning Bluetooth off/on does not have any effect. I tried TI BTool on PC with the TI BLE Dongle and it always establishes connection

connect failed: ECONNREFUSED

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问题 I am developing one app, and what I think I wanna do is receive data from server database in android. So I started to run some tutorials. I found one that is doing pretty much what I want. But I am getting: detailMessage "failed to connect to localhost/127.0.0.1 (port 8080): connect failed: ECONNREFUSED (Connection refused)" (id=830021648792) Whole code of this tutorial is here link Error occurs on : OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream()); I checked that

How to get rid of Connect 3.0 deprecation alert?

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问题 I'm a node.js developer who creates web apps using express.js. By now, my problem is: Whenever I create an app on my computer, npm install its stuff and run it (with node app.js and nodemon) I get this message in the console: connect.multipart() will be removed in connect 3.0 visit https://github.com/senchalabs/connect/wiki/Connect-3.0 for alternatives connect.limit() will be removed in connect 3.0 Express server listening on port 3000 The app works, that's fine. But when I clone an app

PHP mysqli connect function [closed]

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问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I've just started to look into Mysqli and I've understood most of it now, but I'm having a problem with a function that connects me to the database on other pages. What I'm aiming to have is to just type

What are “signed” cookies in connect/expressjs?

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问题 I am trying to figure out what "signed cookies" actually are. There isn't much on the net, and if I try this: app.use(express.cookieParser('A secret')); But still... Cookies are still 100% normal on the browser, and I don't really know what "signed" is here (I was sort of hoping to "see" some weirdness on the client, something like the data encrypted using "A secret" as salt?) The documentation says (https://github.com/expressjs/cookie-parser): Parse Cookie header and populate req.cookies

What's the difference between BeginConnect and ConnectAsync?

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问题 What is the difference between BeginConnect and ConnectAsync ? Subsequently, what is the difference between BeginDisconnect and DisconnectAsync ? The ConnectAsync documentation states: "Begins an asynchronous request for a remote host connection." The BeginConnect documentation also states: "Begins an asynchronous request for a remote host connection." Both the DisconnectAsync and BeginDisconnect also state the same thing: "Begins an asynchronous request to disconnect from a remote endpoint."

“connect EMFILE” error in Node.js

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问题 I have very recently received a lot of traffic to my site that runs Node.js. With the increasing traffic it has started to crash a lot, which has not happened before. I get the following error in my log: { [Error: connect EMFILE] code: 'EMFILE', errno: 'EMFILE', syscall: 'connect' } Error: connect EMFILE at errnoException (net.js:670:11) at connect (net.js:548:19) at net.js:607:9 at Array.0 (dns.js:88:18) at EventEmitter._tickCallback (node.js:192:40) Anyone that have an idea why it crash?

oracle 中 Start with...connect by 的用法(递归查询)

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这几个关键字是查询递归数据的，形成一个树状结构。目前只有oracle支持，其他数据都要结合存储过程实现语法：　　select * from some_table [where 条件1] connect by [条件2] start with [条件3]; 其中 connect by 与 start with 语句摆放的先后顺序不影响查询的结果，[where 条件1]可以不需要。 [where 条件1]、[条件2]、[条件3]各自作用的范围都不相同： [where 条件1]是在根据“connect by [条件2] start with [条件3]”选择出来的记录中进行过滤，是针对单条记录的过滤，不会考虑树的结构； [条件2]指定构造树的条件，以及对树分支的过滤条件，在这里执行的过滤会把符合条件的记录及其下的所有子节点都过滤掉； [条件3]限定作为搜索起始点的条件，如果是自上而下的搜索则是限定作为根节点的条件，如果是自下而上的搜索则是限定作为叶子节点的条件；看下面的例子 TEST 表 EMPNO ENAME DPT MAR SAL 0075 XU D1 0082 3000 0082 BAO D1 0096 4000 0096 ZHAO D2 NULL 5000 0111 MU D2 0082 4000 0056 ZHANG D3 0111 3000 0923 WANG D3

When to use next() and return next() in Node.js

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问题 Scenario : Consider the following is the part of code from a node web app. app.get('/users/:id?', function(req, res, next){ var id = req.params.id; if (id) { // do something } else { next(); //or return next(); } }); Issue : I am checking which one to go with just next() or return next() . Above sample code works exactly the same for both & did not show any difference in execution. Question : Can some one put light on this, when to use next() and when to use return next() and some important

nodejs connect cannot find static

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NOTE: I have tried other solution given here but it didn't work A newbie with NodeJs. I am trying to follow AngularJS pro and got stuck with setting up NodeJs server. According to book, I installed nodejs and then installed connect package using npm install connect then downloaded angularjs in folder next to nodejs folder. Then wrote server.js file to connect to server. Here is the content of the file: var connect = require('connect'); connect.createServer(connect.static("../angularjs")).listen( 5000); When I run this server.js file using: node server.js I get following error: function app(req