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【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
...le（矩形）。我这里用了Circle和Polygon。
步骤1 添加组件
组件说明：圆形围栏按钮：用于显示圆形围栏并判断当前位置是否在圆形围栏内多边形围栏按钮：用于显示多边形围栏并判断当前位置是否在多边形围栏...
Passing variable number of arguments around
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10 Answers
10
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What are all codecs and formats supported by FFmpeg?
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173
Codecs proper:
ffmpeg -codecs
Formats:
ffmpeg -formats
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How to comment out a block of code in Python [duplicate]
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19 Answers
19
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Breaking out of a nested loop
...urn to exit back to the main code.
// goto
for (int i = 0; i < 100; i++)
{
for (int j = 0; j < 100; j++)
{
goto Foo; // yeuck!
}
}
Foo:
Console.WriteLine("Hi");
vs:
// anon-method
Action work = delegate
{
for (int x = 0; x < 10...
What exactly are iterator, iterable, and iteration?
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13 Answers
13
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How to include external Python code to use in other files?
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153
You will need to import the other file as a module like this:
import Math
If you don't want...
Multiline syntax for piping a heredoc; is this portable?
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105
Yes, the POSIX standard allows this. According to the 2008 version:
The here-document sha...
Set Viewbag before Redirect
...ection, you shall not use ViewBag, but TempData
public ActionResult Action1 () {
TempData["shortMessage"] = "MyMessage";
return RedirectToAction("Action2");
}
public ActionResult Action2 () {
//now I can populate my ViewBag (if I want to) with the TempData["shortMessage"] content
ViewBag.Mess...
How do I get the first n characters of a string without checking the size or going out of bounds?
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edited Apr 11 '18 at 3:47
answered Oct 18 '09 at 4:00
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