大约有 14,600 项符合查询结果（耗时：0.0207秒） [XML]
Explain ExtJS 4 event handling
I've recently started learning ExtJS, and have trouble understanding how to handle Events. I have no experience of any previous versions of ExtJS.
...
Best way to test if a row exists in a MySQL table
...umentation, you can SELECT anything.
Traditionally, an EXISTS subquery starts with SELECT *, but it could
begin with SELECT 5 or SELECT column1 or anything at all. MySQL
ignores the SELECT list in such a subquery, so it makes no difference.
...
How can I extract audio from video with ffmpeg?
... extract a portion of audio from a video use the -ss option to specify the starting timestamp, and the -t option to specify the encoding duration, eg from 3 minutes and 5 seconds in for 45 seconds:
ffmpeg -i sample.avi -ss 00:03:05 -t 00:00:45.0 -q:a 0 -map a sample.mp3
The timestamps need to be i...
PG::ConnectionBad - could not connect to server: Connection refused
...e only one instance of the server is running at a time. So when it goes to start again, it fails because there is already a PID file which tells postgres that another instance of the server was started (even though it isn't running, it just didn't get to shutdown and delete the PID).
To fix it rem...
Visual Studio opens the default browser instead of Internet Explorer
...ual Studio have, such as when you close the Internet Explorer browser that starting debug opened, Visual Studio stops debugging. How can I get Visual Studio to open Internet Explorer instead without having to set Internet Explorer as my default browser?
...
Convert a String representation of a Dictionary to a dictionary?
...
Starting in Python 2.6 you can use the built-in ast.literal_eval:
>>> import ast
>>> ast.literal_eval("{'muffin' : 'lolz', 'foo' : 'kitty'}")
{'muffin': 'lolz', 'foo': 'kitty'}
This is safer than using ev...
How to create cron job using PHP?
...le to run using CLI (making sure to include #!/usr/bin/env php at the very start of the file before the <?php tag. This ensures that the shell knows which executable should be invoked when running the script.
share
...
How do I change the working directory in Python?
...t if you make your python program an executable and run it in cron it will start up in your home directory. So it is best to use a fully-qualified path. This definitely works, yet I still use fully-qualified paths in any script I might invoke from Python because there is no guarantee that this wil...
How to share Eclipse configuration over different workspaces
...
I'll start with this, but sadly there are many more settings outside of this directory that I'd like to synchronize.
– David Harkness
Oct 29 '12 at 16:34
...
Android - How To Override the “Back” button so it doesn't Finish() my Activity?
...f you plan on having a service run in the background, make sure to look at startForeground() and make sure to have an ongoing notification or else Android will kill your service if it needs to free memory.
@Override
public void onBackPressed() {
Log.d("CDA", "onBackPressed Called");
Intent se...