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App Inventor 2 JDY-34双模蓝牙模块配置与通信教程 · App Inventor 2 中文网
...LED
Arduino端代码
App Inventon积木块
常见问题
Q1: 无法扫描到JDY-34？
Q2: 连接后马上断开？
Q3: BLE写入数据无反应？
总结
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概述
JDY-34是一款低成本双模蓝牙模...
Is there an auto increment in sqlite?
...old & italic are mine):
The AUTOINCREMENT keyword imposes extra CPU, memory, disk space, and
disk I/O overhead and should be avoided if not strictly needed. It is
usually not needed.
In SQLite, a column with type INTEGER PRIMARY KEY is an alias for the
ROWID (except in WITHOUT ROW...
媒体信息使用指导 · App Inventor 2 中文网
...例：读取音频时长
属性、方法与事件速查
常见问题与验收
完整 .aia 源码与操作指导
媒体信息
不可见组件：读取音乐、视频文件里写着的信息——歌名、歌手、专辑、年份、流派...
LEGO EV3 机器人按键控制 · App Inventor 2 中文网
... 界面优化
故障排除
常见问题
解决方案
项目文件结构
版权声明
« 返回LEGO首页
LEGO EV3 机器人按键控制
项目概述
这是一...
Postgres: “ERROR: cached plan must not change result type”
...stgres 10 instance, enabling the conservative setting does result in extra CPU usage on the database server. It wasn't much though, I could only even see the autosave functionality show up as using a measurable amount of CPU after I'd tuned every single query my load test was using and started push...
Multiprocessing: How to use Pool.map on a function defined in a class?
...eak
q_out.put((i, f(x)))
def parmap(f, X, nprocs=multiprocessing.cpu_count()):
q_in = multiprocessing.Queue(1)
q_out = multiprocessing.Queue()
proc = [multiprocessing.Process(target=fun, args=(f, q_in, q_out))
for _ in range(nprocs)]
for p in proc:
p.da...
Why would you use an ivar?
...ot spots, but none of these inefficiencies are hot spots on their own. The CPU time is just averagely spread among them, yet each of them only has such a tiny fraction of it, it seems a total waste of time to optimize it. And it's true, optimizing just one of them would help absolutely nothing, opti...
Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...监控日志，一方面帮助日志微调，一方面及早发现程序的问题
只做到第1点的，你可以洗洗去睡了。很多公司都有做到第2点和第3点，这些公司的服务端程序基本已经跑了很长时间了，已比较稳定，确实无需花太多时间去关注...
多图选择器使用指导 · App Inventor 2 中文网
... 案例四：处理取消与出错
只选某种格式
常见问题
平台说明
完整 .aia 源码与操作指导
相册单选与多选
第一次测试
多图选择器打开系统相册，让用户选一张或多张图片...
pdftk compression option
...okmarks TOC are gone
gs screen:
takes a ridiculously long time and 100% CPU
errors:
sfopen: gs_parse_file_name failed. ?
| ./base/gsicc_manage.c:1651: gsicc_set_device_profile(): cannot find device profile
74.8MB-->10.2MB hideously pixellated
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