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How to implement WiX installer upgrade?
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In the newest versions (from the 3.5.1315.0 beta), you can use the MajorUpgrade element instead of using your own.
For example, we use this code to do automatic upgrades. It prevents downgrades, giving a localised error message, and also prevents u...
How to quit a java app from within the program
...hange 1 to any number you like, then when you are running your application from a script you can determine if there was an error.
– StormPooper
Nov 24 '11 at 12:59
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how to delete all cookies of my website in php
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PHP setcookie()
Taken from that page, this will unset all of the cookies for your domain:
// unset cookies
if (isset($_SERVER['HTTP_COOKIE'])) {
$cookies = explode(';', $_SERVER['HTTP_COOKIE']);
foreach($cookies as $cookie) {
$par...
Why does this go into an infinite loop?
...alue formerly assigned to x. Really, injecting y makes things no different from the scenario above; we've simply got:
MutableInt x = new MutableInt(); // x is 0.
MutableInt y = new MutableInt(); // y is 0.
MutableInt temp = postIncrement(x); // Now x is 1, and temp is 0.
y = temp; ...
Assigning a variable NaN in python without numpy
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Yes -- use math.nan.
>>> from math import nan
>>> print(nan)
nan
>>> print(nan + 2)
nan
>>> nan == nan
False
>>> import math
>>> math.isnan(nan)
True
Before Python 3.5, one could use float("nan") (case i...
How do I do an OR filter in a Django query?
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There is Q objects that allow to complex lookups. Example:
from django.db.models import Q
Item.objects.filter(Q(creator=owner) | Q(moderated=False))
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In C++, is it still bad practice to return a vector from a function?
...itions, with the exact same values), and the time difference can only come from the cost of allocations, deallocations, and better use of cache.
More specifically, let's use vecSize*numIter = 2^31 = 2147483648, because I have 16GB of RAM and this number ensures that no more than 8GB is allocated (s...
How to properly create composite primary keys - MYSQL
...not make the primary key of the "info" table a composite of the two values from other tables.
Others can articulate the reasons better, but it feels wrong to have a column that is really made up of two pieces of information. What if you want to sort on the ID from the second table for some reason?...
使用 XML 和 Web 服务 · App Inventor 2 中文网
... can decode the result with XMLTextDecode. Then extract the desired items from the resulting list, using the list operation block lookup in pairs. Here’s an example.
Unfortunately, the example below does not work anymore, because Underground Weather is discontinued. As an alternative, Openweat...
Get keys from HashMap in Java
...ke BidiMap (a map that allows bidirectional lookup between key and values) from Apache's Commons Collections - also be aware that several different keys could be mapped to the same value.
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