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How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)?
...een: g, blue: b, alpha: a)
}
}
}
The reason you have to draw/convert the image first into a buffer is because images can have several different formats. This step is required to convert it to a consistent format you can read.
...
Why doesn't os.path.join() work in this case?
...t:
config_root = "/etc/myapp.conf/"
file_name = os.path.join(config_root, sys.argv[1])
If the application is executed with:
$ myapp foo.conf
The config file /etc/myapp.conf/foo.conf will be used.
But consider what happens if the application is called with:
$ myapp /some/path/bar.conf
Then ...
Set time to 00:00:00
...Use *java.time* instead.
.toInstant() // Convert this moment in UTC from the legacy class `Date` to the modern class `Instant`.
.atZone( ZoneId.of( "Africa/Tunis" ) ) // Adjust from UTC to the wall-clock time used by the people of a particular region (a time...
Why don't structs support inheritance?
...= new Derived[2];
Square (v);
By normal conversion rules, a Derived[] is convertible to a Base[] (for better or worse), so if you s/struct/class/g for the above example, it'll compile and run as expected, with no problems. But if Base and Derived are value types, and arrays store values inline, th...
setuptools vs. distutils: why is distutils still a thing?
...t's one reason. The following is straight from the NumPy setup.py:
if len(sys.argv) >= 2 and ('--help' in sys.argv[1:] or
sys.argv[1] in ('--help-commands', 'egg_info', '--version',
'clean')):
# Use setuptools for these commands (they don't work well or at all...
How to detect total available/free disk space on the iPhone/iPad device?
...
Converting to a float may give inaccurate results above around 2GB. If you need to deal with really large file sizes, use a double or long double instead.
– Ash
Feb 3 '12 at 10:16
...
Use C++ with Cocoa Instead of Objective-C?
...o port my small Ogre3D application, seems VERY painful. Is apple trying to convert everyone to Objc, or is this really a feature ?
– jokoon
Feb 7 '13 at 19:06
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...
List all the modules that are part of a python package?
...ol for this job is pkgutil.walk_packages.
To list all the modules on your system:
import pkgutil
for importer, modname, ispkg in pkgutil.walk_packages(path=None, onerror=lambda x: None):
print(modname)
Be aware that walk_packages imports all subpackages, but not submodules.
If you wish to l...
How to Compare Flags in C#?
...
public static bool IsSet( this Enum input, Enum matchTo )
{
return ( Convert.ToUInt32( input ) & Convert.ToUInt32( matchTo ) ) != 0;
}
Then you can do:
FlagTests testItem = FlagTests.Flag1 | FlagTests.Flag2;
if( testItem.IsSet ( FlagTests.Flag1 ) )
//Flag1 is set
Incidentally t...
What is an undefined reference/unresolved external symbol error and how do I fix it?
...rsal-character-name
in a character literal or a non-raw string literal, is converted to
the corresponding member of the execution character set; [SNIP]
Adjacent string literal tokens are concatenated.
White-space characters separating tokens are no longer significant. Each preprocessing token is con...