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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...
Append an object to a list in R in amortized constant time, O(1)?
... up to about a kB per node for my applications. I hold on to large arrays, etc.
– Ana Nimbus
Feb 1 at 6:23
...
CruiseControl [.Net] vs TeamCity for continuous integration?
...e build statistics page that shows build times, unit test count, pass rate etc. is very nice. TeamCity's project home page is also very valuable.
For simple .NET projects you can just tell TeamCity where the solution is and what assemblies have tests and that is all it needs (other than source contr...
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...
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...
If threads share the same PID, how can they be identified?
...ad ID's are usually managed by the thread library itself (such as pthread, etc...). If the 4 threads are started they should have the same PID. The kernel itself will handle thread scheduling and such but the library is the one that is going to be managing the threads (whether they can run or not de...
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...
What's the difference between unit, functional, acceptance, and integration tests? [closed]
...s
Access the network
Hit a database
Use the file system
Spin up a thread
etc.
Any kind of dependency that is slow / hard to understand / initialise / manipulate should be stubbed/mocked/whatevered using the appropriate techniques so you can focus on what the unit of code is doing, not what its d...
iTunes音乐搜索 · App Inventor 2 中文网
...访问速度不稳定，测试时如果转很久没反应，多半是网络问题，
换个时间或者换个网络再试。
App基本逻辑设计
在输入框里打上歌手的名字，点“搜索”按钮。
App 把名字拼进一个网址，向 iTunes 发出请求，然后等。
服务...
What is an SDL renderer?
...lds all info about the Window itself: size, position, full screen, borders etc.
SDL_Renderer
SDL_Renderer is a struct that handles all rendering. It is tied to a SDL_Window so it can only render within that SDL_Window. It also keeps track the settings related to the rendering. There are several ...