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What does the PHP error message “Notice: Use of undefined constant” mean?
...al_escape_string($_POST['message']);
As is, it was looking for constants called department, name, email, message, etc. When it doesn't find such a constant, PHP (bizarrely) interprets it as a string ('department', etc). Obviously, this can easily break if you do defined such a constant later (th...
Exit Shell Script Based on Process Exit Code
...
If you just call exit in the bash with no parameters, it will return the exit code of the last command. Combined with OR the bash should only invoke exit, if the previous command fails. But I haven't tested this.
command1 || exit;
com...
How to determine a user's IP address in node
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In your request object there is a property called connection, which is a net.Socket object. The net.Socket object has a property remoteAddress, therefore you should be able to get the IP with this call:
request.connection.remoteAddress
See documentation for http an...
Powershell v3 Invoke-WebRequest HTTPS error
...419466/new-webserviceproxy-needs-force-parameter-to-ignore-ssl-errors
Basically, in your PowerShell script:
add-type @"
using System.Net;
using System.Security.Cryptography.X509Certificates;
public class TrustAllCertsPolicy : ICertificatePolicy {
public bool CheckValidationResu...
How to import a jar in Eclipse
... to build path so your project will compile if exported:
Create a folder called lib in your project folder.
copy to this folder all the jar files you need.
Refresh your project in eclipse.
Select all the jar files, then right click on one of them and select Build Path -> Add to Build Path
...
How to terminate script execution when debugging in Google Chrome?
...eak happens by instead doing something like:
debugger;throw 1;
or maybe call a non-existent function:
debugger;z();
(Of course this doesn't help if you are trying to step through functions, though perhaps you could dynamically add in a throw 1 or z() or somesuch in the Sources panel, ctrl-S to...
What is the difference between an abstract function and a virtual function?
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An abstract function cannot have functionality. You're basically saying, any child class MUST give their own version of this method, however it's too general to even try to implement in the parent class.
A virtual function, is basically saying look, here's the functionality that ma...
Initializing IEnumerable In C#
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Old now, but I would avoid the second option. You might want this to interact with other IEnumerables that are not compatible with arrays.
– Joel Coehoorn
Oct 5 '18 at 14:23
...
fastest (low latency) method for Inter Process Communication between Java and C/C++
...sleep(0) (which as strace shows causes a single sched_yield() Linux kernel call to be executed) takes 0.3 microsecond - so named pipes scheduled to single core still have much overhead
Some shared memory measurement:
September 14, 2009 – Solace Systems announced today that its Unified Messagin...
Creating a UICollectionView programmatically
...lectionView];
// Do any additional setup after loading the view, typically from a nib.
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return 15;
}
// The cell that is returned must be retrieved from a call to -dequeueReusableC...