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App Inventor 2 PhoneInfo 拓展：获取手机等设备软硬件、版本等相关信息 ·...
...
PhoneInfo.aia
使用方法
GetDeviceID
获取设备ID。Android 10+不支持！
GetPhoneNumber
获取本机手机号码。无SIM卡设备将返回空文本；双SIM卡设备将返回主卡号码。Android 10+不支持！
注：这个方法采用的是较常规的方式获取信息，很...
app inventor拍照的照片如何保存到手机相册？ - App Inventor 2 中文网 - ...
...块拍的照片要存到相册里，指定了图像位址，但还是实现不了，是什么原因呀？
首先，这个照相机拍照完成事件中这个参数是图片的路径，是只读的，更改它没有用，只能考虑将这个路径的图片拷贝到相册中。
拷贝到相册...
“AppInventor学院”App国内各大市场上架之旅 - App应用开发 - 清泛IT社区...
...https://dev.mi.com/xiaomihyperos/console/developer/account
只要apk不报病毒，通过腾讯管家检测就能上架。
其次上架必须准备一个《隐私政策》在线网页url，告知用户你如何访问及访问隐私权限的用途，可以参考：https://www.fun123.cn/static/p...
Should I use an exception specifier in C++?
In C++, you can specify that a function may or may not throw an exception by using an exception specifier. For example:
14 ...
HTTP GET request in JavaScript?
...tion() {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
callback(xmlHttp.responseText);
}
xmlHttp.open("GET", theUrl, true); // true for asynchronous
xmlHttp.send(null);
}
sh...
How many and which are the uses of “const” in C++?
As a novice C++ programmer there are some constructs that look still very obscure to me, one of these is const . You can use it in so many places and with so many different effects that is nearly impossible for a beginner to come out alive. Will some C++ guru explain once forever the various uses a...
Is there a standard sign function (signum, sgn) in C/C++?
...
Surprised no one has posted the type-safe C++ version yet:
template <typename T> int sgn(T val) {
return (T(0) < val) - (val < T(0));
}
Benefits:
Actually implements signum (-1, 0, or 1). Implementations here using copysign only return -1 or 1, w...
How to set cornerRadius for only top-left and top-right corner of a UIView?
...View: UIView = {
let v = UIView(frame: CGRect(x: 10, y: 10, width: 200, height: 200))
v.backgroundColor = .red
return v
}()
override func loadView() {
super.loadView()
view.addSubview(theView)
}
override func viewWillLayoutSubviews() {
...
Declaring pointers; asterisk on the left or right of the space between the type and name? [duplicate
I've seen mixed versions of this in a lot of code. (This applies to C and C++, by the way.) People seem to declare pointers in one of two ways, and I have no idea which one is correct, of if it even matters.
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function declaration isn't a prototype
...arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing. I suggest that you use void consistently when you mean no arguments.
If you have a variable a, extern int a; is a way to tell the compiler that a is a symbol that might be present in a different...