OStack Q&A-Knowledge Sharing Community

0 votes

729 views

1 answer

linux - How to set socket timeout in C when making multiple connections?

I'm writing a simple program that makes multiple connections to different servers for status check. All these ... change the system-default timeout duration ? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

99 views

1 answer

sql - Insert data in 3 tables at a time using Postgres

I want to insert data into 3 tables with a single query. My tables looks like below: CREATE TABLE sample ( ... the next query immediately. How to achieve this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

64 views

1 answer

java - socket programming multiple client to one server

How do you handle multiple client to connect to one server? I have this LogServer.java import javax.net.ssl ... actually work with multiple client / one server? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

448 views

1 answer

algorithm - Hash table runtime complexity (insert, search and delete)

Why do I keep seeing different runtime complexities for these functions on a hash table? On wiki, search and delete ... can I expect the time complexity to be? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

247 views

1 answer

python - Convert list of ints to one number?

I have a list of integers that I would like to convert to one number like: numList = [1, 2, 3] num = magic( ... but it seems like there has to be a better way. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

240 views

1 answer

php - How to require a fork with composer?

This is my composer.json, I want to use Nodge's fork of lessphp project on Github "repositories": [{ "type": ... don't know how to require correctly this fork. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

146 views

1 answer

html - How do I use Google Chrome 11's Upload Folder feature in my own code?

Google Chrome 11 now supports uploading folders. Currently this feature is only implemented in Google Docs, and I ... in a Content Management System I maintain! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

300 views

1 answer

java - InetAddress.getLocalHost() throws UnknownHostException

I am testing our server-application (written Java) on different operating systems and thought that OpenSolaris ( ... aware of? Any hints appreciated, thanks. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

135 views

1 answer

objective c - Initializing a property, dot notation

Is it a bad idea to use the dot notation to initialize retain properties to nil in my init methods? With ... explicitly set foo = nil without the dot notation? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

76 views

1 answer

How can I find the number of arguments of a Python function?

How can I find the number of arguments of a Python function? I need to know how many normal arguments it ... This method has 2 arguments and 1 named argument. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

252 views

1 answer

Android: Getting a file URI from a content URI?

In my app the user is to select an audio file which the app then handles. The problem is that in order ... ; Then do some FileInputStream stuff with said file. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

140 views

1 answer

sql - Difference between two dates in MySQL

How to calculate the difference between two dates, in the format YYYY-MM-DD hh: mm: ss and to get the result in seconds or milliseconds? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

232 views

1 answer

python - What is the point of indexing in pandas?

Can someone point me to a link or provide an explanation of the benefits of indexing in pandas? I ... . Any thoughts on best-practices around indexing? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

764 views

1 answer

locking - Python sharing a lock between processes

I am attempting to use a partial function so that pool.map() can target a function that has more than one ... How can I share the lock between my subprocesses? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

388 views

1 answer

inheritance - C++ cast to derived class

How can i cast to a derived class? The below approaches all give the following error: Cannot convert from BaseType ... *) & m_baseType; // gives same error Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

397 views

1 answer

filesize - java get file size efficiently

While googling, I see that using java.io.File#length() can be slow. FileChannel has a size() method that is ... efficient way in java to get the file size? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

874 views

1 answer

java: How can I do dynamic casting of a variable from one type to another?

I would like to do dynamic casting for a Java variable, the casting type is stored in a different variable. This ... sees it as Integer and I have type problem. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

236 views

1 answer

angular - How to make HTTP request at an interval?

I am quite new to angular and rxjs. I am trying to create an angular2 app that gets some data from ... "node_modules/angular2/bundles/http.dev.js"></script> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

145 views

1 answer

c++ - if (cin >> x) - Why can you use that condition?

I have been using "Accelerated C++" to learn C++ over the summer, and there's a concept which I don't ... x that has whatever value we input into our keyboard? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

375 views

1 answer

python - Sort Pandas Dataframe by Date

I have a pandas dataframe as follows: Symbol Date A 02/20/2015 A 01/15/2016 A 08/21/2015 I want to ... a more straight forward method I'm missing within pandas? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

372 views

1 answer

git commit - How can I recover from an erronous git push -f origin master?

I just committed the wrong source to my project using --force option. Is it possible to revert? I understand ... I may have screwed up my previous revisions. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

150 views

1 answer

sql - Is having an 'OR' in an INNER JOIN condition a bad idea?

In trying to improve the speed of an immensely slow query (several minutes on two tables with only ~50,000 rows ... unlucky somehow in the layout of my tables? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

66 views

1 answer

Multiple rows to one comma-separated value in Sql Server

This question already has answers here: Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

478 views

1 answer

sprite kit - Dealing with different iOS device resolutions in SpriteKit

I'm playing around with SpriteKit in Xcode 6, iOS 8 beta 5. Everything is all laid out and working perfectly ... point me in the right direction with this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

61 views

1 answer

Create a GUID in Java

What are some of the best ways to create a GUID in Java? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

247 views

1 answer

java - How to calculate the intersection of two sets?

This question already has answers here: Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

318 views

1 answer

unicode - How can I output UTF-8 from Perl?

I am trying to write a Perl script using the utf8 pragma, and I'm getting unexpected results. I'm using Mac OS X 10 ... the output, but I get '?ir??s' instead. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

282 views

1 answer

Android: Access child views from a ListView

I need to find out the pixel position of one element in a list that's been displayed using a ListView. It ... the position in the list that the ListView uses. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

Categories

Recent questions

Just Browsing Browsing

Most popular tags