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TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...WiFi状态检查
// 检查WiFi状态
when Screen1.Initialize
do
if WiFi1.IsEnabled then
set Label1.Text to "WiFi已启用"
set Label2.Text to "当前IP: " & WiFi1.LocalIP
set Label3.Text to "当前SSID: " & WiFi1.SSID
else
set Label1.Text to "WiF...
How do you divide each element in a list by an int?
...[10,20,30,40,50,60,70,80,90])
myInt = 10
newArray = myArray/myInt
If you do such operations with long lists and especially in any sort of scientific computing project, I would really advise using numpy.
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How do you reindex an array in PHP?
...
If you want to re-index starting to zero, simply do the following:
$iZero = array_values($arr);
If you need it to start at one, then use the following:
$iOne = array_combine(range(1, count($arr)), array_values($arr));
Here are the manual pages for the functions used:
...
How to articulate the difference between asynchronous and parallel programming?
...running asynchronously so it didn't lock up your UI and you could continue doing other things. Now, each frame of that animation can also be considered as an individual task. If we have multiple CPUs/Cores or multiple machines available, we can render multiple frames in parallel to speed up the over...
GitHub “fatal: remote origin already exists”
...add the new remote with a different name or update the existing one if you don't need it:
To add a new remote, called for example github instead of origin (which obviously already exists in your system), do the following:
$ git remote add github git@github.com:ppreyer/first_app.git
Remember thou...
Resizing an Image without losing any quality [closed]
...
As rcar says, you can't without losing some quality, the best you can do in c# is:
Bitmap newImage = new Bitmap(newWidth, newHeight);
using (Graphics gr = Graphics.FromImage(newImage))
{
gr.SmoothingMode = SmoothingMode.HighQuality;
gr.InterpolationMode = InterpolationMode.HighQualityB...
What is the JavaScript >>> operator and how do you use it?
...
It doesn't just convert non-Numbers to Number, it converts them to Numbers that can be expressed as 32-bit unsigned ints.
Although JavaScript's Numbers are double-precision floats(*), the bitwise operators (<<, >>, ...
How do I perform a Perl substitution on a string while keeping the original?
...tring =~ s/foo/bar/g;
Alternatively, as of Perl 5.13.2 you can use /r to do a non destructive substitution:
use 5.013;
#...
my $newstring = $oldstring =~ s/foo/bar/gr;
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Avoiding SQL injection without parameters
...use parameters to safeguard against sql injections and the other guys that don't think it is necessary. Instead they want to replace single apostrophes with two apostrophes in all strings to avoid sql injections. Our databases are all running Sql Server 2005 or 2008 and our code base is running on ....
Find and Replace Inside a Text File from a Bash Command
What's the simplest way to do a find and replace for a given input string, say abc , and replace with another string, say XYZ in file /tmp/file.txt ?
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