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App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
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现在常规便宜芯片并无蓝牙协议栈，只能通过人工拼包用最简单的蓝牙广播方式通信，可以做到手机与设备进行简单的交互。
无连接的
是单向的，可以向任何人或者接收器发送数据。
使用广播方式通信没有任何安全措...
How to generate JAXB classes from XSD?
I'm a total newbie with XML. I'm doing a Java EE project REST implementation and we return a lot of XML. With this we decided to use JAXB. So far, we manually coded the Models for the XML.
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Notifier 通知扩展：功能强大的Android通知管理工具，支持通知通道、意图、...
...sion.POST_NOTIFICATIONS 权限。必须授予此权限才能显示通知。安装应用程序后，权限默认设置为 denied（拒绝）。Manifest.permission.POST_NOTIFICATIONS 被分类为危险（保护级别：dangerous）。这意味着用户必须明确授予权限。他们可以通过应...
RSA Public Key format
...et in an RSA PUBLIC KEY is closer to the content of a PUBLIC KEY, but you need to offset the start of your ASN.1 structure to reflect the fact that PUBLIC KEY also has an indicator saying which type of key it is (see RFC 3447). You can see this using openssl asn1parse and -strparse 19, as described ...
How do you convert a byte array to a hexadecimal string, and vice versa?
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Using Substring is the best option in combination with Convert.ToByte. See this answer for more information. If you need better performance, you must avoid Convert.ToByte before you can drop SubString.
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Is .NET/Mono or Java the better choice for cross-platform development? [closed]
... it lags behind the Microsoft implementation significantly. The Java SDK seems to stay in better sync across platforms (and it works on more platforms).
I'd also say Java has more tool availability across all those platforms, although there are plenty of tools available for .NET on Windows platf...
Compile time string hashing
... be possible to compute a string's hash at compile time. However, no one seems to be ready to come out and say that it will be possible or how it would be done.
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Passing Parameters JavaFX FXML
...XMLLoader supports dependency injection systems like Guice, Spring or Java EE CDI by allowing you to set a custom controller factory on the FXMLLoader. This provides a callback that you can use to create the controller instance with dependent values injected by the respective dependency injection s...
How to count the number of set bits in a 32-bit integer?
...n implemented with a microcoded loop that tests a bit per cycle (citation needed).
A pre-populated table lookup method can be very fast if your CPU has a large cache and/or you are doing lots of these instructions in a tight loop. However it can suffer because of the expense of a 'cache miss', where...
java.sql.SQLException: - ORA-01000: maximum open cursors exceeded
...me of the theory behind cursors and how JDBC should be used. If you don't need to know the background, you can skip this and go straight to 'Eliminating Leaks'.
What is a cursor?
A cursor is a resource on the database that holds the state of a query, specifically the position where a reader is in ...