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Android emulator shows nothing except black screen and adb devices shows “device offline”
...Verify Configuration dialog. It forces turn off gpu mode whatever you have selected in the Emulated Performance. So change config.ini directly. hw.gpu.enabled=yes and hw.gpu.mode=on. The config files is normally in /user folder/.android/avd/emulator name.avd/.
– Sungsuh Park
...
Remove characters from C# string
... where char.IsWhiteSpace(c) || char.IsLetterOrDigit(c)
select c
).ToArray());
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Set transparent background using ImageMagick and commandline prompt
...background color. I just flood fill the background with transparency, then select the alpha channel and blur it and remove half of the blurred area using -level 50x100%. Then turn back on all the channels and flatten it against the brown color. The -blur 0x1 -level 50x100% acts to antialias the bou...
Freeze screen in chrome debugger / DevTools panel for popover inspection?
...e
Open the dev console - F12 on Windows/Linux or option + ⌘ + J on macOS
Select the Sources tab in chrome inspector
In the web browser window, hover over the desired element to initiate the popover
Hit F8 on Windows/Linux (or fn + F8 on macOS) while the popover is showing. If you have clicked anyw...
Difference between string and text in rails?
... load varchar in one go, but store text (and blob) outside of the table. A SELECT name, amount FROM products could, be a lot slower when using text for name than when you use varchar. And since Rails, by default loads records with SELECT * FROM... your text-columns will be loaded. This will probably...
Query a parameter (postgresql.conf setting) like “max_connections”
... SHOW, such as minimum
and maximum values.
For your original request:
SELECT *
FROM pg_settings
WHERE name = 'max_connections';
Finally, there is current_setting(), which can be nested in DML statements:
SELECT current_setting('max_connections');
Related:
How to test my ad-hoc SQL wit...
How do I make Git use the editor of my choice for commits?
...e are 4 choices for the alternative editor (providing /usr/bin/editor).
Selection Path Priority Status
------------------------------------------------------------
0 /bin/nano 40 auto mode
1 /bin/ed -100 manual mode...
Is it possible to “await yield return DoSomethingAsync()”
... DownLoadAllUrls(string[] urls)
{
return Task.WhenAll(from url in urls select DownloadHtmlAsync(url));
}
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How to create a .gitignore file
...es, then save and close
Hold SHIFT, right click the folder you're in, then select Open command window here
Then rename the file in the command line, with ren gitignore.txt .gitignore
Alternatively @HenningCash suggests in the comments
You can get around this Windows Explorer error by appending...
Changing iframe src with Javascript
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@shinjuo onselect is not the correct attribute to use here. You may want to use onclick - notice though that that won't fire if the user uses their keyboard
– Pekka
Sep 16 '10 at 19:46
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