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How to check if a file exists in Documents folder?
I have an application with In-App Purchase, that when the user buy something, download one html file into the Documents folder of my app.
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Specifically, what's dangerous about casting the result of malloc?
...ou won't get a compiler error, but a compiler warning. As the sources you cite say (especially the first one), you can get an unpredictable runtime error when using the cast without including stdlib.h.
So the error on your side is not the cast, but forgetting to include stdlib.h. Compilers may assu...
what is .netrwhist?
When I edit files in my ~/.vim , the .netrwhist file would mysteriously be changed, too.
4 Answers
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How do I output coloured text to a Linux terminal?
How do I print coloured characters to a Linux terminal that supports it?
13 Answers
13...
Windows batch: echo without new line
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Using set and the /p parameter you can echo without newline:
C:\> echo Hello World
Hello World
C:\> echo|set /p="Hello World"
Hello World
C:\>
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Docker: adding a file from a parent directory
...s works fine on a local box, but Docker Hub fails to build the image since it tries to do it from its same directory (tbh, just what one would normally expect). Is there any way to do the same trick in Docker Hub?
– Marcel Hernandez
Mar 25 '16 at 20:31
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How to get a key in a JavaScript object by its value?
I have a quite simple JavaScript object, which I use as an associative array. Is there a simple function allowing me to get the key for a value, or do I have to iterate the object and find it out manually?
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How can I change UIButton title color?
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You can use -[UIButton setTitleColor:forState:] to do this.
Example:
Objective-C
[buttonName setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
Swift 2
buttonName.setTitleColor(UIColor.blackColor(), forState: .Normal)
Swift 3
b...
How can I find a specific element in a List?
... == "xy");
Note: C# has a built-in syntax for properties. Instead of writing getter and setter methods (as you might be used to from Java), write
private string _id;
public string Id
{
get
{
return _id;
}
set
{
_id = value;
}
}
value is a contextual key...
How do I make a checkbox required on an ASP.NET form?
...tly occurring complaint against this question: "checkboxes can have two legitimate states - checked and unchecked", this is an "I accept the terms and conditions..." checkbox which must be checked in order to complete a registration, hence checking the box is required from a business logic standpoin...