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In a non blocking socket connect, select() always returns 1

由 女生的网名这么多〃 提交于 2019-11-30 13:49:23
I have this code segment that is designed to connect to a server using a socket connection. However if it can not connect to the server within a certain amount of time I would like it to stop trying. I tried to do this with this nonblocking socket and the select command but select is always returning 1 indicating that the server exists when nothing exists at the address I give it. Any Ideas? SOCKET tcp_client( char *hname, char *sname ) { fd_set fdset; struct sockaddr_in peer; SOCKET s; FD_ZERO(&fdset); // FD_SET(STDIN, &fdset); FD_SET(s, &fdset); errno=1; struct timeval tv; tv.tv_sec = 15;

How to view/change socket connection timeout on Linux?

由 雨燕双飞 提交于 2019-11-30 13:10:57
When creating a Socket in Java: new Socket(host, port); The Socket constructor will try to connect to host:port before returning. On Windows, this fails almost immediately for unreachable hosts but for Linux it can take up to 5 minutes for the Socket to timeout. I'm aware that if I have control over creating the Sockets, I can do: Socket s = new Socket(); s.bind(..); s.connect(.., timeout); but I'd rather have the OS use a reasonable default value. Is there a way to change this setting on Linux? Thanks Duck I think you want /proc/sys/net/ipv4/tcp_syn_retries . The default is usually 5 or 6

How to use DBVisualizer to connect to Hbase using Apache Phoenix

由 两盒软妹~` 提交于 2019-11-30 12:31:23
How to use DBVisualizer to connect to Hbase using Apache Phoenix Article DB Visualizer is a popular free tool that allows developers to organize development tools for RDBMS development. With Apache Phoenix, that allows SQL like capability for Hbase, we can use DBVisualizer to connect to Apache Phoenix layer for HBase. Verified with following versions. DBVisualizer version 9.2.12 hbase-client-1.1.2.2.3.2.0-2950.jar phoenix-4.4.0.2.3.2.0-2950-client.jar First Add Phoenix driver to DBVisualizer. In DBVisualizer, go to Tools->Driver Manager and add a new driver. Add both hbase-client and phoenix

Node.js : How to do something on all HTTP requests in Express?

由 梦想与她 提交于 2019-11-30 11:49:52
问题 So I would like to do something like: app.On_All_Incomeing_Request(function(req, res){ console.log('request received from a client.'); }); the current app.all() requires a path, and if I give for example this / then it only works when I'm on the homepage, so it's not really all.. In plain node.js it is as simple as writing anything after we create the http server, and before we do the page routing. So how to do this with express, and what is the best way to do it? 回答1: Express is based on the

Express: Setting content-type based on path/file?

由 一笑奈何 提交于 2019-11-30 11:12:36
I know Express has the res.contentType() method, but how to set automatically content type based on path/file (including static content)? Peter Lyons Connect will automatically set the content type, unless you explicitly set it yourself. Here's the snippet that does it. It uses mime.lookup and mime.charsets.lookup // mime type type = mime.lookup(path); //<SNIP>.... // header fields if (!res.getHeader('content-type')) { var charset = mime.charsets.lookup(type); res.setHeader('Content-Type', type + (charset ? '; charset=' + charset : '')); } If this isn't working for you, post your code as your

in express.js, any way to capture request to both json and html in one function?

由 一个人想着一个人 提交于 2019-11-30 10:48:35
问题 Does anybody know a way in express.js to capture requests in a single function for both html and json? Essentially I want a single route for both /users and /users.json - like rails does with its routes -> controller. That way, I can encapsulate the logic in a single function and decide to render either html or json. Something like: app.get('/users[.json]', function(req, res, next, json){ if (json) res.send(JSON.stringfy(...)); else res.render(...); //jade template }); Could I use a param

Proper way to remove middleware from the Express stack?

由 泪湿孤枕 提交于 2019-11-30 08:57:23
问题 Is there a canonical way to remove middleware added with app.use from the stack? It seems that it should be possible to just modify the app.stack array directly, but I am wondering if there is a documented method I should be considering first. 回答1: use actually comes from Connect (not Express), and all it really does is push the middleware function onto the app's stack. So you should be just fine splicing the function out of the array. However, keep in mind there is no documentation around

Apache: how can I access my webpage from a computer outside my network?

由 ￣綄美尐妖づ 提交于 2019-11-30 07:18:18
I want to access my webpage from a computer outside the network. Our network has IPs like 192.168.0.1-192.168.0.255. The network is connected to Internet through a local gateway 192.168.0.1 and gets to DNS server 193.xxx.xxx.xxx. Let's say my computer has the IP 192.168.0.50. How can I my website from my server (Apache) from a computer which is not from our network (let's say 254.231.52.xxx)? Thank you! Short answer: The solution to this would be to find out the 'external IP' of your router and enable a port forwarding for port 80 and 443 to your local IP. Long answer: The Internet is divided

pyqt对话框

由 江枫思渺然 提交于 2019-11-30 05:53:01
1 import sys 2 from PyQt5.QtCore import * 3 from PyQt5.QtGui import * 4 from PyQt5.QtWidgets import * 5 class MyWindow(QWidget): 6 def __init__(self,parent=None): 7 super(MyWindow,self).__init__(parent) 8 self.setWindowTitle("弹出式对话框例子") 9 self.resize(400,200) 10 self.btn1=QPushButton(self) 11 self.btn1.setText("消息框") 12 self.btn1.clicked.connect(self.msg1) 13 layout=QVBoxLayout() 14 15 self.btn2=QPushButton(self) 16 self.btn2.setText("问答对话框") 17 self.btn2.clicked.connect(self.msg2) 18 19 self.btn3=QPushButton() 20 self.btn3.setText("警告对话框") 21 self.btn3.clicked.connect(self.msg3) 22 23 self

Express resources with authentication middleware?

由 ⅰ亾dé卋堺 提交于 2019-11-30 05:51:11
Passport.js offers great authentication for node.js and Express including a middleware solution: ensureAuthenticated = function(req, res, next) { if (req.isAuthenticated()) { return next(); } return res.redirect("/login"); }; How can I use this middleware in the express-resource module? Unfortunately, app.resource('users', ensureAuthenticated, require('./resources/users')); doesn't work. I know this is a little too late, and the original post was answered, however, I was looking for the same answer and found a solution I thought others might want to know. Just make sure ensureAuthenticated is
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