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TCP vs UDP on video stream
...y exam in network-programming, and one of the question they asked us was "If you are going to stream video, would you use TCP or UDP? Give an explanation for both stored video and live video-streams" . To this question they simply expected a short answer of TCP for stored video and UDP for live vid...
What is the difference between a static and a non-static initialization code block
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The code block with the static modifier signifies a class initializer; without the static modifier the code block is an instance initializer.
Class initializers are executed in the order they are defined (top down, just like simple variable initializers) w...
Can PNG image transparency be preserved when using PHP's GDlib imagecopyresampled?
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This solution, in my case GD works fine ONLY if PNG has a "regular" transparency area, like a surrounding transparent area, if it has a complex area, like with inner parts of the image with transparency, it always fails and puts black background, for example this image ...
How to get active user's UserDetails
...User) ((Authentication) principal).getPrincipal();
...
}
That is ok if you need it once. But if you need it several times its ugly because it pollutes your controller with infrastructure details, that normally should be hidden by the framework.
So what you may really want is to have a contro...
Validate that a string is a positive integer
...tive integer" to include 0, even though 0 is not positive. I include notes if you want to disallow 0.
Based on Parsing
If you want it to be a normalized decimal integer string over a reasonable range of values, you can do this:
function isNormalInteger(str) {
var n = Math.floor(Number(str));
...
How to use the pass statement?
..._a(self):
pass
def meth_b(self):
print "I'm meth_b"
If you were to leave out the pass, the code wouldn't run.
You would then get an:
IndentationError: expected an indented block
To summarize, the pass statement does nothing particular, but it can act as a placeholder, as d...
new keyword in method signature
...wo(); // Calls implementation in B
Override can only be used in very specific cases. From MSDN:
You cannot override a non-virtual or
static method. The overridden base
method must be virtual, abstract, or
override.
So the 'new' keyword is needed to allow you to 'override' non-virtual ...
How to check whether a string contains a substring in Ruby
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You can use the include? method:
my_string = "abcdefg"
if my_string.include? "cde"
puts "String includes 'cde'"
end
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Check if string ends with one of the strings from a list
...t not why it cannot accept lists. Since they are both sequences, the only difference I can potentially see is that lists are mutable, while tuples are immutable. I may be wrong, but I can't see any other reason why that is explicitly stated.
– KymikoLoco
Jan 31...
How to call methods dynamically based on their name? [duplicate]
...just use public_send:
method_name = 'foobar'
obj.public_send(method_name) if obj.respond_to? method_name
If the method is private/protected, use send instead, but prefer public_send.
This is a potential security risk if the value of method_name comes from the user. To prevent vulnerabilities, yo...