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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...

低功耗蓝牙(BLE)以低功耗、低成本、开发简便逐渐被广泛应用,本文主要介绍一款较为通用、价格低廉的BLE设备从零开始如何利用App Inventor 2开发一款自己专属的手机蓝牙App应用。BLE与经典蓝牙的区别可参考:《低功耗蓝牙(BLE) ...
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App Inventor 2 数学积木完全指南:从加减乘除到位运算,一篇搞定所有计算...

App Inventor 2 数学积木完全指南:从加减乘除到位运算,一篇搞定所有计算需求 做 App 的时候,你觉得最离不开却又最容易被忽视的积木是什么?答案就是——数学运算积木。无论是计算购物总价、处理传感器数据,还是做游戏...
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Boost Statechart vs. Meta State Machine

... Minor nit-pick: In release mode, the use of C++ RTTI (dynamic_cast, typeid) is strictly optional with Boost.Statechart. – user49572 Nov 30 '10 at 7:43 add a comme...
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How to increment a pointer address and pointer's value?

...*p)++ => 5 *(p)++ => 5 *++p => 0 *(++p) => 0 I cast the pointer addresses to ints so they could be easily compared. I compiled it with GCC. share | improve this answer ...
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CDC:DrawText 多行显示文本(文本自动换行) - C++ UI - 清泛IT社区,为创新赋能!

//长文本自动换行 dc.DrawText(str, &rect, DT_LEFT | DT_TOP | DT_WORDBREAK | DT_EDITCONTROL, m_pfSongTi); 函数原型: int DrawText(     HDC hDC,          // handle to DC     LPCTSTR lpString, // text to draw     int nCount,...
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Populate data table from data reader

...lumn. lines in the dtSchema foreach loop because it said it was an illegal cast to bool on (bool)drow["IsUnique"]. I didn't need them, getting the column names in order to populate the new DataTable is enough. This managed to help me overcome a ds.Fill(adapter) issue where I could not load a large t...
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编译失败! Error: Your build failed due to an error in the AAPT stage,...

编译apk报错如下: 经过日志分析如下: Tag <activity> attribute name has invalid character [java] /tmp/1685410160630_0.39828964915976717-0/youngandroidproject/../build/AndroidManifest.xml:5: Tag <activity> attribute name has invalid character '�'.    &n...
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Android系统级推送原理详解:为什么App被杀也能收到通知? - App应用开发 -...

本文是"App Inventor 2 推送通知调研"系列的第三篇 相关帖子:AI2能否实现后台推送?源码级深度调研 | Supabase扩展Realtime能力分析 很多开发者都好奇:微信、淘宝这些 App,明明已经被我从后台杀掉了,为什么还能收到...
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我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑",手机一划车就...

周五晚上,儿子抱着他那辆吃灰半年的遥控车跑来问我:"爸爸,能不能让手机控制它?我想躺在床上就能让它跑。"看着他期待的眼神,我决定用App Inventor 2的蓝牙组件试试。没想到两小时就搞定了,而且连接稳定性和操...
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App Inventor 2 能否实现后台推送通知?源码级深度调研 - App应用开发 - 清...

背景:微信群用户提问 AI2 能否实现类似 uni-push 的后台推送通知?手机开机不打开 App 就能自动读取云端数据。 以下是源码级深度调研结果。 一、推送通知的工作原理 系统级推送(真推送) 服务器 -> FCM/APNs 云...