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How to implement a unique index on two columns in rails
...t different syntax for specifying the columns.
– François Beausoleil
Nov 8 '10 at 13:30
14
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Virtualbox “port forward” from Guest to Host [closed]
...twork communication Host -> Guest
Connect to the Guest and find out the ip address:
ifconfig
example of result (ip address is 10.0.2.15):
eth0 Link encap:Ethernet HWaddr 08:00:27:AE:36:99
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0
Go to Vbox instance window ->...
CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...网络(CDN)是一种新型的网络构建方式，它是为能在传统的IP网发布宽带丰富媒体而特别优化的网络覆盖层；而从广义的角度，CDN代表了一种基于质量与秩序的网络服务模式。简单地说，内容发布网络(CDN)是一个经策略性部署的整体...
How to get visitor's location (i.e. country) using geolocation? [duplicate]
...need to locate the user if you only need their country. You can look their IP address up in any IP-to-location service (like maxmind, ipregistry or ip2location). This will be accurate most of the time.
If you really need to get their location, you can get their lat/lng with that method, then query ...
GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
...耗较多内存
Android 10+：使用专门的Android 10+版本
文件权限：访问SD卡需要相应的存储权限
应用场景
加载动画和进度指示器
交互式按钮和菜单
动态图标和徽章
教程和演示动画
游戏元素和动画效果
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TCP: can two different sockets share a port?
...n is uniquely identified by the combination of client-side and server-side IP/Port pairs. Multiple connections on the same server can share the same server-side IP/Port pair as long as they are associated with different client-side IP/Port pairs, and the server would be able to handle as many clien...
PHP how to get local IP of system
I need to get local IP of computer like 192.*....
Is this possible with PHP?
16 Answers
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Usage of forceLayout(), requestLayout() and invalidate()
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To better understand answers provided by François BOURLIEUX and Dalvik I suggest you take a look at this awesome view lifecycle diagram by Arpit Mathur:
share
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impro...
Run/install/debug Android applications over Wi-Fi?
...9.
Connect the device via USB and make sure debugging is working;
adb tcpip 5555. This makes the device to start listening for connections on port 5555;
Look up the device IP address with adb shell netcfg or adb shell ifconfig with 6.0 and higher;
You can disconnect the USB now;
adb connect <DE...
How can I connect to Android with ADB over TCP? [closed]
... computer that has the device connected via USB, issue the commands
adb tcpip 5555
adb connect 192.168.0.101:5555
Be sure to replace 192.168.0.101 with the IP address that is actually assigned to your device. Once you are done, you can disconnect from the adb tcp session by running:
adb disconnect ...