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How can I use Timer (formerly NSTimer) in Swift?
...u lose the reference to the timer and you can't stop it anymore. (see this Q&A)
Don't use timers when they aren't needed. See the timers section of the Energy Efficiency Guide for iOS Apps.
Related
How to work with dates and time in Swift
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C++及Windows异常处理(try，catch; __try,__finally, __except) - C/C++ - ...
...逐一说明
本文参考了如下博文：
http://www.cnblogs.com/wenziqi/archive/2010/08/26/1809074.html
http://blog.csdn.net/lvwenshuai/article/details/6163342
http://topic.csdn.net/t/20030527/10/1838724.html
http://zhidao.baidu.com/question/183400727.html
C++ 异常处理：try，catch
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What is the maximum value for an int32?
...uld still be positive (an example negative in base-2 would be -1). That sequence of bits is only negative if representing a 32-bit 2's complement number :)
– BlueRaja - Danny Pflughoeft
May 16 '14 at 13:35
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Run PostgreSQL queries from the command line
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psql -U username -d mydatabase -c 'SELECT * FROM mytable'
If you're new to postgresql and unfamiliar with using the command line tool psql then there is some confusing behaviour you should be aware of when you've entered an in...
How to rename with prefix/suffix?
...$usage unless getopts('fnxV', \%opts);
if ($opts{V})
{
printf "%s\n", q'RENAME Version $Revision: 1.7 $ ($Date: 2008/02/16 07:53:08 $)';
exit 0;
}
$force = 1 if ($opts{f});
$noexc = 1 if ($opts{n});
$trace = 1 if ($opts{x});
my($op) = shift;
die $usage unless defined $op;
if (!@ARGV) {
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How to use NSJSONSerialization
...utableContainers error:&e];
NSLog(@"%@", json);
(I had to escape the quotes in the JSON string with backslashes.)
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Maven error “Failure to transfer…”
... all your failed downloads:
find ~/.m2 -name "*.lastUpdated" -exec grep -q "Could not transfer" {} \; -print -exec rm {} \;
For windows:
cd %userprofile%\.m2\repository
for /r %i in (*.lastUpdated) do del %i
Then rightclick on your project in eclipse and choose Maven->"Update Project ...",...
Run cron job only if it isn't already running
...ning... Restarted."
exit 0
fi
It runs every two minutes and is quite effective. I have it email me with special information if for some reason the process is not running.
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improv...
Submitting a form by pressing enter without a submit button
...ute, or at least I would:
<script type="text/javascript">
// Using jQuery.
$(function() {
$('form').each(function() {
$(this).find('input').keypress(function(e) {
// Enter pressed?
if(e.which == 10 || e.which == 13) {
this.form.submit();
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How do I find which rpm package supplies a file I'm looking for?
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This is an old question, but the current answers are incorrect :)
Use yum whatprovides, with the absolute path to the file you want (which may be wildcarded). For example:
yum whatprovides '*bin/grep'
Returns
grep-2.5.1-55.el5.x86_64 :...