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App Inventor 2 开发多用户注册登录签到系统 - AppInventor连接网络微数据...

...数据库”和本地的“微数据库”不一样,本地微数据库的操作都是一步到位的,获取和存储的数据立马生效。但是由于网络可能会有抖动、延时,因此网络数据的操作都是异步的,请求后不会立马拿到数据,而是在“获得数据”...
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Cannot install Lxml on Mac os x 10.9

... I solved this issue on Yosemite by both installing and linking libxml2 and libxslt through brew: brew install libxml2 brew install libxslt brew link libxml2 --force brew link libxslt --force If you have solved the problem using this method but it...
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How can I check the system version of Android?

... Check android.os.Build.VERSION. CODENAME: The current development codename, or the string "REL" if this is a release build. INCREMENTAL: The internal value used by the underlying source control to represent this build. RELEASE:...
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App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网

...指定用于发送消息的端口号。 如果值为 0 或负数,Android 操作系统将确定一个空闲端口。建议使用 默认值为 0。然后,操作系统将选择一个空闲端口进行发送。有效值为 0...65535。 此规范影响扩展实例的所有 Xmit... 方法。 定义...
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How to redirect output with subprocess in Python?

... UPDATE: os.system is discouraged, albeit still available in Python 3. Use os.system: os.system(my_cmd) If you really want to use subprocess, here's the solution (mostly lifted from the documentation for subprocess): p = subpro...
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Restoring MySQL database from physical files

Is it possible to restore a MySQL database from the physical database files. I have a directory that has the following file types: ...
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What is difference between monolithic and micro kernel?

... kernel can invoke functions directly. Examples of monolithic kernel based OSs: Unix, Linux. In microkernels, the kernel is broken down into separate processes, known as servers. Some of the servers run in kernel space and some run in user-space. All servers are kept separate and run in different a...
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Restore the state of std::cout after manipulating it

Suppose I have a code like this: 8 Answers 8 ...
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Difference between malloc and calloc?

..., while malloc() leaves the memory uninitialized. For large allocations, most calloc implementations under mainstream OSes will get known-zeroed pages from the OS (e.g. via POSIX mmap(MAP_ANONYMOUS) or Windows VirtualAlloc) so it doesn't need to write them in user-space. This is how normal malloc ...
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In Python script, how do I set PYTHONPATH?

... It has been many years since this answer was posted, but I still want to add that if you want to make sure that Python checks the new directory before all of the others when importing, you should put the new directory first in the list, as in sys.path.insert(0, '/path/to...