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How do I get the coordinates of a mouse click on a canvas element?
...X || e.pageY) {
x = e.pageX;
y = e.pageY;
}
else {
x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
y = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
}
x -= gCanvasElement.offsetLeft;
y -= gCanvasElement.offsetTop;
Worked perf...
Throwing exceptions from constructors
..., throwing an exception from the failed constructor is the standard way of doing this. Read this FAQ about Handling a constructor that fails for more information. Having a init() method will also work, but everybody who creates the object of mutex has to remember that init() has to be called. I feel...
How do I get the backtrace for all the threads in GDB?
...x "thread apply all bt" -ex "quit" > output.log
– Doomsday
Mar 28 '18 at 9:32
1
You can shorte...
How do you copy a record in a SQL table but swap out the unique id of the new row?
...
The id-column is an identity column (in my table) so I don't care about the value. I just want a new record holding the same values as the "old" one.
– Jonas
Feb 22 '13 at 14:26
...
Android TextView Justify Text
How do you get the text of a TextView to be Justified (with text flush on the left- and right- hand sides)?
27 Answers
...
How do I import CSV file into a MySQL table?
...ce import dialogs for this kind of thing.
My favourite for the job is Windows based HeidiSQL. It gives you a graphical interface to build the LOAD DATA command; you can re-use it programmatically later.
Screenshot: "Import textfile" dialog
To open the Import textfile" dialog, go to Tools > ...
Jquery select all elements that have $jquery.data()
...
You could do
$('[data-myAttr!=""]');
this selects all elements which have an attribute data-myAttr which is not equal to '' (so it must have been set);
you could also use filter()
$('*').filter(function() {
return $(this).dat...
How can I link to a specific glibc version?
...inst an older one so long as it is valid by using the the same .symver pseudo-op that is used for defining versioned symbols in the first place. The following example is excerpted from the blog post.
The following example makes use of glibc’s realpath, but makes sure it is linked against an olde...
Dynamic variable names in Bash
...
Hmm. I'm using bash 4.2.45(2) and declare doesn't list it as an option declare: usage: declare [-afFirtx] [-p] [name[=value] ...]. It seems to be working correctly however.
– fent
Dec 2 '13 at 15:56
...
Linux command (like cat) to read a specified quantity of characters
...d discard the rest.
To just get the first five bytes from standard input, do:
dd count=5 bs=1
Note that, if you want to specify the input file name, dd has old-fashioned argument parsing, so you would do:
dd count=5 bs=1 if=filename
Note also that dd verbosely announces what it did, so to tos...