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实时预览录制使用指导 · App Inventor 2 中文网
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拖一个实时预览录制、一个垂直布局（改名 垂直布局_预览，宽「充满」、高 400 像素）当预览区，
再放 按钮_录制、按钮_停止、一个视频播放器；
搭下面的代码块：
各案例独立使用；组合到同一屏幕时，将同名事件的...
How should I print types like off_t and size_t?
I'm trying to print types like off_t and size_t . What is the correct placeholder for printf() that is portable ?
9 ...
Programmatically obtain the Android API level of a device?
... obtain API level programatically by the system constant (Build.VERSION.SDK_INT). For example you can run some piece of code which requires newer API in the following way (it will execute if the current device's API level is at least 4)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.DONUT) {
...
Underscore: sortBy() based on multiple attributes
...rst, then sort again by your first property, like this:
var sortedArray = _(patients).chain().sortBy(function(patient) {
return patient[0].name;
}).sortBy(function(patient) {
return patient[0].roomNumber;
}).value();
When the second sortBy finds that John and Lisa have the same room numbe...
How to build for armv6 and armv7 architectures with iOS 5
In iOS5 Apple drops the armv6 architecture from the ARCHS_STANDARD_32_BIT .
6 Answers
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How do I loop through or enumerate a JavaScript object?
...ach object in javascript (actually a key-value pair) has a property called __proto__ or prototype. This property has a reference to its parent object. An object automatically inherits property from its parent. This is the reason of using hasOwnProperty, which signifies that we're interested in objec...
Read-only and non-computed variable properties in Swift
...property which returns that property:
public class Clock {
private var _hours = 0
public var hours: UInt {
return _hours
}
}
But this can be achieved in a different, shorter way, as stated in the section "Access Control" of the "The Swift Programming Language" book:
public class Clo...
What is the difference between a 'closure' and a 'lambda'?
...nd "voo-doo magic" of programmers and language vendors unaware of the real roots of these notions.
I hope that answers your questions. But if you had any follow-up questions, feel free to ask them in the comments, and I'll try to explain it better.
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Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the La
...ght need to strip all the white-space from the base64 data...
function b64_to_utf8( str ) {
str = str.replace(/\s/g, '');
return decodeURIComponent(escape(window.atob( str )));
}
2017 Update
This problem has been bugging me again.
The simple truth is, atob doesn't really handle UT...
Python logging: use milliseconds in time format
.... This can not be fixed by specifying a datefmt because ct is a time.struct_time and these objects do not record milliseconds.
If we change the definition of ct to make it a datetime object instead of a struct_time, then (at least with modern versions of Python) we can call ct.strftime and then we...