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使用Activity启动器组件 · App Inventor 2 中文网
...的应用程序，则可以运行 ActivityStarter.ResolveActivity 命令来测试用户设备是否支持你所需的 Activity，如果不支持，则生成相应的错误消息。
启动相机
要启动 Android 相机应用程序，请使用具有 IMAGE_CAPTURE Action 属性的活动启动器。 ...
Difference between core and processor
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A core is usually the basic computation unit of the CPU - it can run a single program context (or multiple ones if it supports hardware threads such as hyperthreading on Intel CPUs), maintaining the correct program state, registers, and correct execution order, and performing the operations throug...
ActiveMQ or RabbitMQ or ZeroMQ or [closed]
...ns of ActiveMQ vs RabbitMQ vs ZeroMQ. Information about any other interesting message queues is also welcome.
17 Answers
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Why does Typescript use the keyword “export” to make classes and interfaces public?
While dabbling with Typescript I realised my classes within modules (used as namespaces) were not available to other classes unless I wrote the export keyword before them, such as:
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ListCtrl 重绘（Custom Draw） - C/C++ - 清泛网 - 专注C/C++及内核技术
...common controls DLL的版本是5.0。我已经对其在WinNT 4上进行了测试。系统要运行这些代码，它的common controls DLL的版本必须至少是4.71。但随着IE4 的发布，这已经不是问题了。(IE会夹带着这个DLL一起发布)
Custom Draw 基础
我将会尽我所...
How do I create a random alpha-numeric string in C++?
I'd like to create a random string, consisting of alpha-numeric characters. I want to be able to be specify the length of the string.
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How to get the number of Characters in a String?
..."fmt"
"strings"
"unicode/utf8"
)
func main() {
b := "这是个测试"
len1 := len([]rune(b))
len2 := bytes.Count([]byte(b), nil) -1
len3 := strings.Count(b, "") - 1
len4 := utf8.RuneCountInString(b)
fmt.Println(len1)
fmt.Println(len2)
fmt.Println(len3)
fm...
What is the best way to detect a mobile device?
Is there a way to detect whether or not a user is using a mobile device in jQuery? Something similar to the CSS @media attribute? I would like to run a different script if the browser is on a handheld device.
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Warning on “diff.renamelimit variable” when doing git push
I'm pushing the local commit to the remote git server and got the following warning messages:
2 Answers
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Multiple columns index when using the declarative ORM extension of sqlalchemy
According to the documentation and the comments in the sqlalchemy.Column class, we should use the class sqlalchemy.schema.Index to specify an index that contains multiple columns.
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