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How can I calculate an md5 checksum of a directory?
...md5sums are sorted.
The md5sum of this sorted list is then returned.
I've tested this by copying a test directory:
rsync -a ~/pybin/ ~/pybin2/
I renamed some of the files in ~/pybin2.
The find...md5sum command returns the same output for both directories.
2bcf49a4d19ef9abd284311108d626f1 -
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What is the difference between MediaPlayer and VideoView in Android
...ml
Also some people had issues playing video on emulator, so make sure to test it on actual device if you have issues
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What is the Difference Between read() and recv() , and Between send() and write()?
...reverse problem if 13-10 are consecutive in the binary data, but I haven't tested it. But that appears to be another possible difference between send() and write().
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'App not Installed' Error on Android
...in I have been creating a signed .apk and exporting it to my HTC Desire to test. It has all been fine.
61 Answers
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java.util.regex - importance of Pattern.compile()?
...ormance benefit can be quite significant.
I did a quick benchmark:
@Test
public void recompile() {
var before = Instant.now();
for (int i = 0; i < 1_000_000; i++) {
Pattern.compile("ab").matcher("abcde").matches();
}
System.out.println("recom...
running Rails console in production
...e production
production can of course be substituted with development or test (value is development by default)
Adding the option --sandbox makes it so that any changes you make to your database in the console will be rolled back after you exit
If this isn't working for you, you may need to try
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How to dynamically create CSS class in JavaScript and apply?
...ment.className = element.className + " " + name;
}
}
Here's a little test page as well: https://gist.github.com/shadybones/9816763
The key little bit is the fact that style elements have a "styleSheet"/"sheet" property which you can use to to add/remove rules on.
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How can I convert an RGB image into grayscale in Python?
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Three of the suggested methods were tested for speed with 1000 RGBA PNG images (224 x 256 pixels) running with Python 3.5 on Ubuntu 16.04 LTS (Xeon E5 2670 with SSD).
Average run times
pil : 1.037 seconds
scipy: 1.040 seconds
sk : 2.120 seconds
PIL and ...
How to read the content of a file to a string in C?
...e more tricky, and unfortunately I don't have a compiler in front of me to test, but the functionality is provided by CreateFileMapping() and MapViewOfFile().
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String concatenation in Ruby
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The + operator is the normal concatenation choice, and is probably the fastest way to concatenate strings.
The difference between + and << is that << changes the object on its left hand side, and + doesn't.
irb(main):001:0> s = 'a'
=> "a"
irb(main):002:0> s + 'b'
=> "ab"
i...