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数据存储组件 · App Inventor 2 中文网
...用程序是AI伴侣运行还是已编译、以及应用运行的 Android 版本。
由于较新版本的 Android 要求将文件存储在App特定目录中，因此 默认作用域 设置为 App，如果使用的是旧版 Android 并且需要访问兼容的公共存储，将 默认作用域 属性...
Terminating a script in PowerShell
I've been looking for a way to terminate a PowerShell (PS1) script when an unrecoverable error occurs within a function. For example:
...
Is MATLAB OOP slow or am I doing something wrong?
...of functions and methods. Here are some typical results.
>> call_nops
Computer: PCWIN Release: 2009b
Calling each function/method 100000 times
nop() function: 0.02261 sec 0.23 usec per call
nop1-5() functions: 0.02182 sec 0.22 usec per call
nop() subfunction...
How to Remove ReadOnly Attribute on File Using PowerShell?
... Using PowerShell v2 I'm seeing hard-to-use CmdLet bindngs for sp. PSCX Set-Writable and Set-ReadOnly don't have those problems. I'll blog the problems I'm seeing and link to it later. I recommend Keith's answer for PowerShell v2 (modern PowerShell).
– yzorg
...
How do I get a list of column names from a psycopg2 cursor?
...s directly from the selected column names, and recall seeing that python's psycopg2 module supports this feature.
10 Answer...
How do I tell matplotlib that I am done with a plot?
The following code plots to two PostScript (.ps) files, but the second one contains both lines.
6 Answers
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java.io.Console support in Eclipse IDE
I use the Eclipse IDE to develop, compile, and run my Java projects. Today, I'm trying to use the java.io.Console class to manage output and, more importantly, user input.
...
Base 64 encode and decode example code
...encoded with Base64.encodeBytes(), here was my solution:
// encode
String ps = "techPass";
String tmp = Base64.encodeBytes(ps.getBytes());
// decode
String ps2 = "dGVjaFBhC3M=";
byte[] tmp2 = Base64.decode(ps2);
String val2 = new String(tmp2, "UTF-8");
Also, I'm supporting older versions of An...
What does `:_*` (colon underscore star) do in Scala?
...of type T . That is, if a method m with type
(p1 : T1, . . . , pn : Tn,ps : S*)U is applied to arguments (e1, . . . , ek) where k >= n, then
m is taken in that application to have type (p1 : T1, . . . , pn : Tn,ps : S, . . . , ps0S)U,
with k ¡ n occurrences of type S where any parame...
how to release localhost from Error: listen EADDRINUSE
...
I did ps aux | grep node, find the process id (second column) and simply kill it with kill <pid> (mine was kill 18762).
– nik_m
Feb 6 '18 at 14:46
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