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【解决】ble蓝牙 RequestMTU 请求没有反应?设置没有生效? - 创客硬件开发...

1、确认代码正确,RequestMTU 最好在 连接成功之后再调用(调用“连接”方法之后里面调用,可能会失败,不触发回调): (不建议,有失败的可能) [hide] (建议写法) 2、MTUChanged 事件成功触发,但是值不是指定的值?...
https://bbs.tsingfun.com/thread-2916-1-1.html 

鸿蒙的证书适用范围 - HarmonyOS NEXT - 清泛IT社区,为创新赋能!

...工作原理:当您在 DevEco Studio 中勾选“自动生成签名”并连接设备时,IDE 会自动帮您完成一系列操作: 1. 自动获取您连接设备的 UDID。 2. 使用您的华为开发者账号,在后台自动申请调试证书。 3. 生成密钥库文件(.p12)和...
https://bbs.tsingfun.com/thread-2957-1-1.html 

UrsPahoMqttClient心跳问题解决——Paho底层已自动处理,设好KeepAlive就行...

问一下心跳PingReq报文怎么发的 目的为保持 MQTT 连接,否则会被踢下线。 用的是什么MQTT扩展?UrsPahoMqttClient。 结论:不需要手动发心跳,Paho底层已内置实现 UrsPahoMqttClient 封装的是 Eclipse Paho MQTT 客户端,心跳(PingReq)...
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Why is  appearing in my HTML? [duplicate]

...; // Or this // dirname(__FILE__) $HOME = dirname(__FILE__); // Is this a Windows host ? If it is, change this line to $WIN = 1; $WIN = 0; // That's all I need ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <...
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App Inventor 2 ListView自定义Item教程 - 打造精美列表 · App Inventor 2 中文网

...表 Spinner是另一种列表选择组件,显示为下拉菜单: when Screen1.Initialize() { Spinner1.Elements = createList("选项1", "选项2", "选项3") } when Spinner1.AfterSelecting(selection) { Label1.Text = join("选择了:", selection) } 方案三:WebV...
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C++ compiling on Windows and Linux: ifdef switch [duplicate]

I want to run some c++ code on Linux and Windows. There are some pieces of code that I want to include only for one operating system and not the other. Is there a standard #ifdef that once can use? ...
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Git Extensions: Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0

... Cygwin uses persistent shared memory sections, which can on occasion become corrupted. The symptom of this is that some Cygwin programs begin to fail, but other applications are unaffected. Since these shared memory sections are...
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Why is creating a new process more expensive on Windows than Linux?

I've heard that creating a new process on a Windows box is more expensive than on Linux. Is this true? Can somebody explain the technical reasons for why it's more expensive and provide any historical reasons for the design decisions behind those reasons? ...
https://www.tsingfun.com/ilife/life/1843.html 

30岁之后,程序员该向什么方向发展? - 杂谈 - 清泛网 - 专注C/C++及内核技术

...不努力,到多少岁都一样。 以前也有人问我二十几岁再开始编程晚不晚,我的回答是,不晚,什么时候都不晚。 QA&2. 您个人或身边有这样的实例吗?和国外程序员的职场生存状态相比,是否有异同? 严清: 公司里大多数是9...
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MFC OnEraseBkgnd浅析 - C/C++ - 清泛网 - 专注C/C++及内核技术

...Classwizard 或者使用Classwizard来进行,省去了写代码。通过菜单View->ClassWizard(或者ctrl+W)->Class name中选你的view。然后在Class Info选项卡中,将Message Filter设为Child Window。重新切换到Message Map选项卡,在Messages中找到WM_ERASEBKGND,双...