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Is there a practical use for weak references? [duplicate]
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If you want to keep a reference to something as long as it is used elsewhere e.g. a Listener, you can use a weak reference.
WeakHashMap can be used as a short lived cache of keys to derived data. It can also be used to keep information about objects used else where and you don't...
How to send a message to a particular client with socket.io
I'm starting with socket.io + node.js, I know how to send a message locally and to broadcast socket.broadcast.emit() function:- all the connected clients receive the same message.
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C# using streams
...hich all other stream classes in .NET are derived. The Stream class deals with bytes.
The concrete stream classes are used to deal with other types of data than bytes. For example:
The FileStream class is used when the outside source is a file
MemoryStream is used to store data in memory
System.N...
socket.error: [Errno 48] Address already in use
I'm trying to set up a server with python from mac terminal.
10 Answers
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Convert hex string to int in Python
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Without the 0x prefix, you need to specify the base explicitly, otherwise there's no way to tell:
x = int("deadbeef", 16)
With the 0x prefix, Python can distinguish hex and decimal automatically.
>>> print int("0x...
Using CSS to affect div style inside iframe
Is it possible to change styles of a div that resides inside an iframe on the page using CSS only?
13 Answers
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Read data from SqlDataReader
I have a SQL Server 2008 database and I am working on it in the backend. I am working on asp.net/C#
13 Answers
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Finding all possible permutations of a given string in python
... all permutations from that string, by changing the order of characters in it. For example, say:
24 Answers
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How to check if a URL is valid
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Use the URI module distributed with Ruby:
require 'uri'
if url =~ URI::regexp
# Correct URL
end
Like Alexander Günther said in the comments, it checks if a string contains a URL.
To check if the string is a URL, use:
url =~ /\A#{URI::regexp}\z/
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Android on-screen keyboard auto popping up
One of my apps has an "opening screen" (basically a menu) that has an EditText followed by several Button s. The problem is that several of my users are reporting that when they open the app it's automatically popping up the on-screen keyboard without them even touching the EditText . As far as ...