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如何让初始化全局变量为自己输入的数值 - App Inventor 2 中文网 - 清泛IT...
...局变量：
3、除法一定要判断除数非零：
出现报错问题13016915507 发表于 2024-10-04 21:26
出现报错问题
请提供以一下报错截图问题已经重新发帖
Error 1801 : Security Error Receiving Blocks from Browser. - App Inven...
...此我们将调查发生了什么。
因此，看起来这里有两个问题。首先，由于您的应用启用了高对比度模式，但 iOS 上还没有这个选项，因此它在初始化期间会抛出错误。不知何故，这被解释为安全错误，但我们仍需要找出原因。在...
APP被手机识别为疑似病毒 - App应用开发 - 清泛IT社区，为创新赋能！
...用，忽略警告，加入白名单，继续安装，使用上没有任何问题。有些手机有所谓的“纯净模式”阻止安装，可以考虑在设置中关闭它。
2、如果想要发布，可以先线上检测一下：https://m.qq.com/security_lab/scans_online.jsp
上传APK文件...
BLE 蓝牙APP 接收不到来自蓝牙模块的讯息 - App应用开发 - 清泛IT社区，为创新赋能！
...。每当收到更改时，将触发 BytesReceived 事件。
你这个问题比较泛，需要具体问题具体分析，如果App还是收不到数据，建议使用UART线调试一下，看硬件数据是否成功发送。
如需更具体的问题解决服务，请右侧扫码联系在线客...
What is the difference between an interface and abstract class?
...return this.fuel;
}
}
Implementing an interface consumes very little CPU, because it's not a class, just a bunch of names, and therefore there isn't any expensive look-up to do. It's great when it matters, such as in embedded devices.
Abstract classes
Abstract classes, unlike interfaces, a...
Select n random rows from SQL Server table
...ISTICS IO ON
/* newid()
rows returned: 10000
logical reads: 3359
CPU time: 3312 ms
elapsed time = 3359 ms
*/
SELECT TOP 1 PERCENT Number
FROM Numbers
ORDER BY newid()
/* TABLESAMPLE
rows returned: 9269 (varies)
logical reads: 32
CPU time: 0 ms
elapsed time: 5 ms
*/
SELECT N...
Should I use multiplication or division?
...ython it's faster to multiply than to divide, but as you get closer to the CPU using more advanced VMs or JITs, the advantage disappears. It's quite possible that a future Python VM would make it irrelevant
share
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App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
...设备标识符。然后，接收器会过滤掉它感兴趣的设备。
问题是：App Inventor 没有内置 UDP，而且我找不到可用的扩展。所以自己动手吧。
注意：
如果智能手机和远程站位于同一个（本地）网络中，则扩展可以完美运行。如果智...
Why must wait() always be in synchronized block
...the x-level cache (a.k.a. 1st/2nd/3rd-level caches) of the thread handling CPU core.
But synchronized blocks are only one side of the medal: If you actually access an object within a synchronized context from a non-synchronized context, the object still won't be synchronized even within a synchroni...
Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...
This may have to do with the size of your cpu cache. If 2 rows of the matrix matrix do not fit, then you will loose time swapping in elements from RAM. The extra 4095 elements may just be enough to prevent rows from fitting.
In your case, 2 rows for 2047 2d matrices...