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一文了解大数据领域创业的机会与方向 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...变现模式
互联网上最赚钱的两大行业分别是电子商务和网络游戏，这两个行业的变现模式都是非常清晰和直接的，但是大数据的变现模式需要绕一个弯子，需要和实际业务场景结合起来才能产生价值，不直接的路定然不好走。
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BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
...听、初始化、连接等五个状态。HCI层： 向上为主机提供软件应用程序接口，对外为外部硬件提供控制接口。L2CAP层： 对传输数据实行封装。SM层： 提供主机和客机的配对和密钥分发，实现安全连接和数据交换。ATT层： 对数据主...
VideoRecorder 拓展：前台预览录制 + 后台无预览录制，支持分辨率、码率设...
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典型场景
用户主动录制、扫码录像
后台监控、静默录制
独有功能
摄像头切换、闪光灯、静音
取消录制、录制中截图
两者共享同一组编码属性（Quality、BitRate、FrameRate 等），录音权...
Copying PostgreSQL database to another server
... to work compressed you can use a compressed tunnel
pg_dump -C dbname | bzip2 | ssh remoteuser@remotehost "bunzip2 | psql dbname"
or
pg_dump -C dbname | ssh -C remoteuser@remotehost "psql dbname"
but this solution also requires to get a session in both ends.
Note: pg_dump is for backing up...
How do you make sure email you send programmatically is not automatically marked as spam?
...he DNS information for your site.
Check your reverse DNS to make sure the IP address of your mail server points to the domain name that you use for sending mail.
Make sure that the IP-address that you're using is not on a blacklist
Make sure that the reply-to address is a valid, existing address....
内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...好处在于它有很多其他工具，可以处理编写多平台服务器软件所有方面的事情。要深入了解 GNU obstack 和 Apache 的池式内存实现，请参阅 参考资料部分中指向这些实现的文档的链接。
下面的假想代码列表展示了如何使用 obstack：
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How to change XAMPP apache server port?
... Yes its working in localhost:8012 but when i trying remotely with my ip address my-ip-address:8012 getting page not found error.
– Sathishkumar
Jul 2 '12 at 15:14
1
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What is a web service endpoint?
...can be accessed by a client application. The same web service can have multiple endpoints, for example in order to make it available using different protocols.
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Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server
... it's not a great idea to have a user with this kind of access open to any IP. If you need an administrative user, use root, and leave it on localhost. For any other action specify exactly the privileges you need and limit the accessibility of the user as Pascal has suggest below.
Edit:
From the M...
Difference between \n and \r?
...that the roller can move while the carriage is still going leftwards!-) Wikipedia has a more detailed explanation.
for character-mode terminals (typically emulating even-older printing ones as above), in raw mode, \r and \n act similarly (except both in terms of the cursor, as there is no carriage o...