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How to validate an email address using a regular expression?
...ut a hitch. Python and C# can do that too, but they use a different syntax from those first two. However, if you are forced to use one of the many less powerful pattern-matching languages, then it’s best to use a real parser.
It's also important to understand that validating it per the RFC tells ...
Should I put #! (shebang) in Python scripts, and what form should it take?
...thon 2 and Python 3. Otherwise, it should point to the appropriate choice from python2 and python3.
– amiller27
Jan 19 '17 at 3:50
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Fast way to get image dimensions (not filesize)
...ions also PPM, WEBP), and does only read the header.
The identify command (from ImageMagick) prints lots of image information for a wide variety of images. It seems to restrain itself to reading the header portion (see comments). It also has a unified output which file sadly lacks.
exiv2 gives you d...
Add number of days to a date
...y allows a date; e.g., new DateTime('2016-12-09 10:35:58'); that is coming from a database timestamp...
– mshaffer
Dec 19 '16 at 23:43
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What is the advantage of using forwarding references in range-based for loops?
...This doesn't compile because rvalue vector<bool>::reference returned from the iterator won't bind to a non-const lvalue reference. But this will work:
#include <vector>
int main()
{
std::vector<bool> v(10);
for (auto&& e : v)
e = true;
}
All that being ...
How to automatically convert strongly typed enum into int?
... That's another weird example of 'we know better what you want to do' from C++ creators. Conventional (old-style) enums had tons of benefits like implicit conversion to indexes, seamless using of bitwise operations etc.. The new style enums added a really great scoping thing, but... You cannot...
What are forward declarations in C++?
...tise to always forward declare and include headers as needed in .cpp file? From reading your answer it would appear it should be so, but I'm wondering if there's any caveats?
– Zepee
Feb 11 '15 at 19:28
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What is the purpose of a self executing function in javascript?
...ght solve our problem. Everything is now enclosed and can only be accessed from within our opening and closing braces.
We have a function in a function... which is weird to look at, but totally legal.
Only one problem. Our code doesn't work.
Our userName variable is never echoed into the console! ...
Send a file via HTTP POST with C#
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Using .NET 4.5 (or .NET 4.0 by adding the Microsoft.Net.Http package from NuGet) there is an easier way to simulate form requests. Here is an example:
private async Task<System.IO.Stream> Upload(string actionUrl, string paramString, Stream paramFileStream, byte [] paramFileBytes)
{
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Checking for NULL pointer in C/C++ [closed]
...e language is much simpler and reliance on the pre-processor more common.
From this perspective I'd probably recommend using the NULL macro definition in C.
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