大约有 47,000 项符合查询结果（耗时：0.0742秒） [XML]
How to get my IP address programmatically on iOS/macOS?
...ddress and type-casting it to IPv4 and turning that to a string (basically from the high 32 bits of the 128-bit address.)
– Jens Alfke
Oct 9 '13 at 21:16
|...
How to erase the file contents of text file in Python?
...runcate(0)
By default truncate() truncates the contents of a file starting from the current cusror position.
A simple example
share
|
improve this answer
|
follow
...
Conveniently map between enum and int / String
...
A side-note:As you correctly point out, the ordinal() may be "unstable" from version to version. This is the exact reason why I always store constants as strings in my databases. (Actually, when using MySql, I store them as MySql enums!)
...
Copy entire contents of a directory to another using php
...
Apart from that, commandline controls from a PHP file can be a big problem when someone find a way to get a file on your server.
– Martijn
Feb 21 '14 at 13:41
...
Command to get nth line of STDOUT
...
From sed1line:
# print line number 52
sed -n '52p' # method 1
sed '52!d' # method 2
sed '52q;d' # method 3, efficient on large files
From awk1line:
# print line number 52...
Changing the maximum length of a varchar column?
I'm trying to update the length of a varchar column from 255 characters to 500 without losing the contents. I've dropped and re-created tables before but I've never been exposed to the alter statement which is what I believe I need to use to do this. I found the documentation here: ALTER TABLE (Tra...
Apply a function to every row of a matrix or a data frame
...
(Here, the function applied normalizes every row to 1.)
Note: The result from the apply() had to be transposed using t() to get the same layout as the input matrix A.
A <- matrix(c(
0, 1, 1, 2,
0, 0, 1, 3,
0, 0, 1, 3
), nrow = 3, byrow = TRUE)
t(apply(A, 1, function(x) x / sum(x) ))
R...
What is the HEAD in git?
...d to as heads - they're stored in refs/heads. Lower-case head is different from HEAD, though. My answer clarifies this a bit.
– Cascabel
Mar 27 '10 at 16:26
7
...
How to resize images proportionally / keeping the aspect ratio?
...
Have a look at this piece of code from http://ericjuden.com/2009/07/jquery-image-resize/
$(document).ready(function() {
$('.story-small img').each(function() {
var maxWidth = 100; // Max width for the image
var maxHeight = 100; // Max ...
Ajax success event not working
... +1 even my, but on code that wasn't mine, I solved by returning json data from server
– albanx
Aug 17 '12 at 10:15
4
...