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Fast way to get image dimensions (not filesize)
...ntify -format "%h" "$0")> /dev/null
And this also hides any potential error messages. Modern implementations of identify only read the header, not the whole image, so it is fast. Not sure how it compares to other methods though.
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Running the new Intel emulator for Android
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still got some errors when trying to execute the emulator , and the emulation either shows black (when using gpu) or is just slow as before , especially compared to a real device. is this a good configuration: tinypic.com/view.php?pic=efgv8...
The differences between .build, .create, and .create! and when should they be used?
...ore succinct.
.create! is equivalent to .new followed by .save! (throws an error if saving fails). It's also just a wee bit shorter
I think .build is mostly an alias for .new. It works one way in Rails 3 and another way in Rails < 3.x
The most important part, however, is that these methods can...
How can I format a decimal to always show 2 decimal places?
...y, wrapping num in a tuple is a coding convention to prevent a duck typing error on arguments during string formatting. It doesn't have any effect in this case with a float conversion, but it prevents an unexpected type error when converting to strings. Consider r = 1; "%s" % r; r = (1, 2); "%s" %...
SQL how to increase or decrease one for a int column in one command
...at is, you try to do the creation first. If it's already there, ignore the error. Otherwise you create it with a 0 value.
Then do the update which will work correctly whether or not:
the row originally existed.
someone updated it between your insert and update.
It's not a single instruction and...
C++ convert hex string to signed integer
...t just fine.
Boost has some stuff to do this as well, which has some nice error checking capabilities as well. You can use it like this:
try {
unsigned int x = lexical_cast<int>("0x0badc0de");
} catch(bad_lexical_cast &) {
// whatever you want to do...
}
If you don't feel like ...
Rethrowing exceptions in Java without losing the stack trace
...so advise on adding a message alongside, using throw new YourOwnException("Error while trying to ....", e);
– Julien
Mar 30 '17 at 9:19
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In php, is 0 treated as empty?
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just add an @strlen to omit the error log, just in case... to not create a big log
– Miguel
Jun 8 '15 at 12:06
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Why are local variables not initialized in Java?
...meObject();
so.DoUsefulThings();
} finally {
so.CleanUp(); // Compiler error here
}
The commenter's complaint is that the compiler balks at the line in the finally section, claiming that so might be uninitialized. The comment then mentions another way of writing the code, probably something li...
Programmatically stop execution of python script? [duplicate]
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sys.exit() will do exactly what you want.
import sys
sys.exit("Error message")
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