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Environment variables for java installation
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Java SE Development Kit 8u112 on a 64-bit Windows 7 or Windows 8
Set the following user environment variables (== environment variables of type user variables)
JAVA_HOME : C:\Program Files\Java\jdk1.8.0_112
JDK_HOME : %JAVA_HOME%
JRE_HOME : ...
“Application tried to present modally an active controller”?
I just came across a crash showing a NSInvalidArgumentException with this message on an app which wasn't doing this before.
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MYSQL OR vs IN performance
...81504631s
Update:
(I don't have the source code for the original test, as it was 6 years ago, though it returns a result in the same range as this test)
In request for some sample code to test this, here is the simplest possible use case. Using Eloquent for syntax simplicity, raw SQL equivalent ex...
Create an array with same element repeated multiple times
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You can do it like this:
function fillArray(value, len) {
if (len == 0) return [];
var a = [value];
while (a.length * 2 <= len) a = a.concat(a);
if (a.length < len) a = a.concat(a.slice(0, len - a.length));
return a;
}
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What Makes a Method Thread-safe? What are the rules?
...ethod thread-safe? I understand that there are probably a million one-off situations, but what about in general? Is it this simple?
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How do I use NSTimer?
... lists guides for the topic being documented (if any exist). For example, with NSTimer, the documentation lists two companion guides:
Timer Programming Topics for Cocoa
Threading Programming Guide
For your situation, the Timer Programming Topics article is likely to be the most useful, whilst th...
Generating an MD5 checksum of a file
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You can use hashlib.md5()
Note that sometimes you won't be able to fit the whole file in memory. In that case, you'll have to read chunks of 4096 bytes sequentially and feed them to the md5 method:
import hashlib
def md5(fname):
hash_md5 = hashlib.md5()
with open(fname, "rb") as f:
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Why do you program in assembly? [closed]
... across this sentence in a blog. I don't really think the source matters (it's Haack if you really care) because it seems to be a common statement.
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Converting many 'if else' statements to a cleaner approach [duplicate]
My code here detects if the mimeType is equals to some MIME type, if it is, it will do a certain conversion
7 Answers
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Disable cache for some images
...ser no caching can be performed.
The random number generation can happen either on the server when serving the page (just make sure the page itself isn't cached...), or on the client (using JavaScript).
You will need to verify whether your web-server can cope with this trick.
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