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云数据及Firebase组件简介 · App Inventor 2 中文网
...(GINGERBREAD_MR1) 或更高版本，无论是用于开发应用程序时的实时测试还是运行使用该组件的应用程序 (.apk)。
使用云数据
将 FirebaseDB 组件添加到项目中可以提供对多个块的访问。 要使应用程序在云中存储数据，请使用 StoreValue ...
提升速度：XP注册表与驱动优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...我离开计算机的时候，我会把它的优先级提升为最高的“实时”，这样可以计算机更专注更快速地处理3D动作。
5、取消Windows XP专业版中的保留带宽
由于专业版在网络上的需要，所以设定了20%的默认保留带宽，其实对于个人用...
What is the difference between AF_INET and PF_INET in socket programming?
... Protocol Family
Meaning, AF_INET refers to addresses from the internet, IP addresses specifically. PF_INET refers to anything in the protocol, usually sockets/ports.
Consider reading the man pages for socket(2) and bind(2). For the sin_addr field, just do something like the following to set it:
...
Viewing my IIS hosted site on other machines on my network
...he Port you want to allow
Allow All Connections
Enter a name and some description so that you remember it later on
Done
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PHP Session Fixation / Hijacking
...ed so it's not 100% reliable, but it's better than not.
Include the user's IP address from $_SERVER['REMOTE_ADDR'] in the session. Basically, when the session starts, store it in something like $_SESSION['remote_ip']. This may be problematic from some ISPs that use multiple IP addresses for their ...
TCP vs UDP on video stream
...tivity; therefore TCP is more appropriate for replaying a video-on-demand.
IP multicast significantly reduces video bandwidth requirements for large audiences; TCP prevents the use of IP multicast, but UDP is well-suited for IP multicast.
Live video is normally a constant-bandwidth stream recorded o...
How do I fix the error 'Named Pipes Provider, error 40 - Could not open a connection to' SQL Server'
...g with SERVER/INSTANCENAME when everything is configured correctly, named pipes, user access rights... and suddenly it struck me, it's not a slash, it's a backslash (\).
The horror, the shame...
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MySQL CONCAT returns NULL if any field contain NULL
...ONCAT(COALESCE(`affiliate_name`,''),'-',COALESCE(`model`,''),'-',COALESCE(`ip`,''),'-',COALESCE(`os_type`,''),'-',COALESCE(`os_version`,'')) AS device_name
FROM devices
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Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
...out which username you should use is often lacking from the AMI Image description. But you can find some in AWS EC2 documentation, bullet point 4. :
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AccessingInstancesLinux.html
Use the ssh command to connect to the instance. You'll specify the...
How to detect the physical connected state of a network cable/connector?
...nected state of an RJ45 connector to its socket. Preferably using BASH scripting only.
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