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iPhone - Grand Central Dispatch main thread
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Dispatching a block to the main queue is usually done from a background queue to signal that some background processing has finished e.g.
- (void)doCalculation
{
//you can use any string instead "com.mycompany.myqueue"
dispatch_queue_t backgroundQueue = dispatch_queue_c...
How do I implement interfaces in python?
...ts a specific interface, and you can use ABC's for that too by subclassing from them. Another way is zope.interface, a module that is a part of the Zope Component Architecture, a really awesomely cool component framework. Here you don't subclass from the interfaces, but instead mark classes (or even...
In Python, how do you convert a `datetime` object to seconds?
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Consider using: datetime.datetime.utcfromtimestamp(0) I've used this to get the 'epoch' easily. Note that epoch is not always the same on all systems.
– D. A.
Nov 5 '13 at 20:04
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How to create hyperlink to call phone number on mobile devices?
...l include them.
Since we never know where our website visitors are coming from, we need to make phone numbers callable from anywhere in the world. For this reason the + sign is always necessary. The + sign is automatically converted by your mobile carrier to your international dialing prefix, also ...
Android and setting width and height programmatically in dp units
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You'll have to convert it from dps to pixels using the display scale factor.
final float scale = getContext().getResources().getDisplayMetrics().density;
int pixels = (int) (dps * scale + 0.5f);
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Change SQLite database mode to read-write
How can I change an SQLite database from read-only to read-write?
14 Answers
14
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Django DB Settings 'Improperly Configured' Error
... 3) to check some things, I get the weirdest error when I try importing - from django.contrib.auth.models import User -
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ImportError: Cannot import name X
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You have circular dependent imports. physics.py is imported from entity before class Ent is defined and physics tries to import entity that is already initializing. Remove the dependency to physics from entity module.
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Redis - Connect to Remote Server
...st to be sure.
After establishing it is listening where you expect it to, from a remote node which should have access try:
redis-cli -h REMOTE.HOST ping
You could also try that from the local host but use the IP you expect it to be listening on instead of a hostname or localhost. You should see ...
Creating .pem file for APNS?
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Here is what I did, From:blog.boxedice.com and "iPhone Advanced Projects" chapter 10 byJoe Pezzillo.
With the aps_developer_identity.cer in the keychain:
Launch Keychain Access from your local Mac and from the login keychain, filter by the Ce...