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BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Host，为后续建立链路做准备。主动扫描不仅仅可以扫描到对端设备的广播数据包，还可以捕获对端设备的响应包（回应包）。
被动扫描：设备被动扫描周围环境中对等设备发送出来的广播包并直接上报到Host。不连接的情况下...
使用 XML 和 Web 服务 · App Inventor 2 中文网
... 我要 分享 扫码分享到朋友圈 顶部 var qrcode = new QRCode("qrcode", { text: window.location.href + "?f=share", //URL地址 width: 150, height: 150, colorDark: '#000000', //二维码颜色 colorLight: "#ffffff" ...
使用std::string作为std::map的key出错解决 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ror C2676: 二进制“<”:“const std::string”不定义该运算符或到预定义运算符可接收的类型的转换
反正是乱七八糟的错误，原因很简单，少了 #include <string>
（注意，不是string.h，如果包含了string.h，请改为string）std::string std::...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...et’s see how this works by modifying the above example.
正如你看到的， 1. __enter__()方法被执行 2. __enter__()方法返回的值 - 这个例子中是"Foo"，赋值给变量'sample' 3. 执行代码块，打印变量"sample"的值为 "Foo" 4. __exit__()方法被调用 with真正强...
为维护国家安全 中国限制出口无人机和高性能计算机 - 资讯 - 清泛网 - 专注...
...行器、无人驾驶飞艇飞行的人员；
“续航时间”指换算到国际标准大气环境条件（ISO2533：1975）下海平面零风状态的持续飞行时间；
“自然视距”指无任何辅助手段，有或没有视力矫正情况下的人的视距。
1.2无人驾驶航空飞...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...detected. This function returns the angle.
One noteworthy finding when we tested the component is that $MotionEvent.ACTION_MOVE$ is too sensitive. A tiny movement with fingers will invoke this event, so it detects the rotation even when we do not intend it to. In order to solve this problem, we add...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...detected. This function returns the angle.
One noteworthy finding when we tested the component is that $MotionEvent.ACTION_MOVE$ is too sensitive. A tiny movement with fingers will invoke this event, so it detects the rotation even when we do not intend it to. In order to solve this problem, we add...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...detected. This function returns the angle.
One noteworthy finding when we tested the component is that $MotionEvent.ACTION_MOVE$ is too sensitive. A tiny movement with fingers will invoke this event, so it detects the rotation even when we do not intend it to. In order to solve this problem, we add...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...detected. This function returns the angle.
One noteworthy finding when we tested the component is that $MotionEvent.ACTION_MOVE$ is too sensitive. A tiny movement with fingers will invoke this event, so it detects the rotation even when we do not intend it to. In order to solve this problem, we add...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...detected. This function returns the angle.
One noteworthy finding when we tested the component is that $MotionEvent.ACTION_MOVE$ is too sensitive. A tiny movement with fingers will invoke this event, so it detects the rotation even when we do not intend it to. In order to solve this problem, we add...