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为AppInventor2开发自己的拓展(Extension) - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...实现任何的安卓功能。注意：java/kotlin写出来的拓展只能运行于安卓设备上，对于iOS设备需要使用swift开发iOS版本的拓展。环境配置安装好 Java开发环境 以及 Ant编译环境，这里以Windows为例，供参考：安装完JDK后配置环境变量 计...
浅谈TCP优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...对TCP优化有一种雾里看花的感觉，实际上只要理解了TCP的运行方式就能掀开它的神秘面纱。Ilya Grigorik在「High Performance B...很多人常常对TCP优化有一种雾里看花的感觉，实际上只要理解了TCP的运行方式就能掀开它的神秘面纱。Ilya ...
Linux C/C++程序常用的调试手段及异常排查总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...升级的进程没有去设置环境变量，升级转换配置的模块在运行的过程中异常挂掉了，升级模块进程有依赖另一个进程，而且两者间需要保证确定的启动优先顺序等，但是不能确定啊，所以我改了下脚本，在两种最可能出现的场景...
A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
...e the function that validates the receipt, it will throws an error if it's unable to validate it.
func validateReceipt() throws {
guard let appStoreReceiptURL = Bundle.main.appStoreReceiptURL, FileManager.default.fileExists(atPath: appStoreReceiptURL.path) else {
throw ReceiptValidatio...
How do you run a crontab in Cygwin on Windows?
...~/lunch_message_to_mates.sh
Domain users: it does not work. Poor cron is unable to run scheduled tasks on behalf of domain users on the machine. But there is another way: cron also runs stuff found in the system level cron table in “/etc/crontab”. So insert your suff there, so that SYSTEM does...
PHP function to generate v4 UUID
...nerate cryptographically secure random bytes or throw an exception if it's unable to. This is better than even openssl_random_psuedo_bytes() whose output is sometimes not cryptographically secure under some circumstances.
– thomasrutter
Jul 12 '19 at 1:51
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C dynamically growing array
...quickly grow if its size is irrelevant. In specialist uses this should be tunable.
– Dan Sheppard
Jul 19 '16 at 20:49
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Can every recursion be converted into iteration?
...ented by the non-recursive Turing-complete calculus.
Unfortunately, I’m unable to find a good, formal definition of GOTO online so here’s one:
A GOTO program is a sequence of commands P executed on a register machine such that P is one of the following:
HALT, which halts execution
r = r + 1 ...
分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...，加入更多的机器来分担性能上的问题，以及来解决单点故障问题。 通常，我们会通过两种手段来扩展我们的数据服务：
1）数据分区：就是把数据分块放在不同的服务器上（如：uid % 16，一致性哈希等）。
2）数据镜像：让所...
Cannot import the keyfile 'blah.pfx' - error 'The keyfile may be password protected'
...as logged on as myself, not as the build service account, no wonder it was unable to find it - doh!
– Daniel Morritt
Jan 10 '12 at 12:52
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