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How can you find the height of text on an HTML canvas?
...example of this working, I used this technique in the Carota editor.
Following on from ellisbben's answer, here is an enhanced version to get the ascent and descent from the baseline, i.e. same as tmAscent and tmDescent returned by Win32's GetTextMetric API. This is needed if you want to do a word-...
IN vs OR in the SQL WHERE Clause
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I assume you want to know the performance difference between the following:
WHERE foo IN ('a', 'b', 'c')
WHERE foo = 'a' OR foo = 'b' OR foo = 'c'
According to the manual for MySQL if the values are constant IN sorts the list and then uses a binary search. I would imagine that OR evaluates t...
Need for predictable random generator
...o this time, again, they have a 1 in 5 chance. If they fail, next time the winning interval is 4 and 5; a 2 in 5 chance of success. With these choices, after 8 failures, they are certain to succeed.
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How to bind RadioButtons to an enum?
...ception (Oct 10 '18):
Updated the example to remove the possibility of throwing a NullReferenceException. IsChecked is a nullable type so returning Nullable<Boolean> seems a reasonable solution.
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How can I programmatically generate keypress events in C#?
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The question is tagged WPF but the answers so far are specific WinForms and Win32.
To do this in WPF, simply construct a KeyEventArgs and call RaiseEvent on the target. For example, to send an Insert key KeyDown event to the currently focused element:
var key = Key.Insert; ...
Node.js on multi-core machines
...naging the flow of events and N processes doing heavy compute tasks and chewing up the other 15 CPUs.
For scaling throughput on a webservice, you should run multiple Node.js servers on one box, one per core and split request traffic between them. This provides excellent CPU-affinity and will scale t...
How to use PHP OPCache?
...you will first have to enable it. To do this you would have to do the following.
Add the following line to your php.ini:
zend_extension=/full/path/to/opcache.so (nix)
zend_extension=C:\path\to\php_opcache.dll (win)
Note that when the path contains spaces you should wrap it in quotes:
zend_exten...
Phonegap Cordova installation Windows
...s absolutely horrible. All I'm trying to do is install PhoneGap 3.0 on my Windows environment but having no success.
13 An...
HTML5shiv vs Dean Edwards IE7-js vs Modernizr - which to choose?
...ard that jQuery won but for now there's no telling which one of these will win this particular fight. I don't think I could recommend dean edwards ie7-js as it mostly deals with just getting IE7 to act like other more intelligent and likable browsers as opposed to leveraging the whole HTML5 thing as...
How can I obtain the element-wise logical NOT of a pandas Series?
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it may not be correct on a different platform. Win 7, python 3.6.3 numpy 1.13.3, pandas 0.20.3, (-s) will be the fastest, (~s) is the second, and np.invert(s) is the slowest one
– gaozhidf
Apr 8 '18 at 1:25
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