大约有 1,600 项符合查询结果(耗时:0.0170秒) [XML]

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IOException: read failed, socket might closed - Bluetooth on Android 4.3

... It doesn't work on nexus 4. can you please tell how to overcome this problem. I have almost tried everything. Thanks. – Shah Feb 27 '15 at 19:45 3 ...
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How do you write a migration to rename an ActiveRecord model and its table in Rails?

I'm terrible at naming and realize that there are a better set of names for my models in my Rails app. Is there any way to use a migration to rename a model and its corresponding table? ...
https://www.tsingfun.com/it/os_kernel/712.html 

通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...rver 发出请求,那么此时 server 就会需要创建大量的 socket 连接。但在一个系统当中,往往需要限制单个 server 程序所能使用的最大 socket 数,以供其他的 server 程序所使用。那么我们如何来做到这一点呢?答案是我们可以通过 ulimi...
https://www.tsingfun.com/it/cpp/1299.html 

CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术

...例详细介绍了使用过程,Step1的配置可能不够完全,比如无法运行make install,无法运行make test,但可以参考。) 简单的程序编译。 (1)运行GUI的cmake,指定要编译的源代码路径和二进制文件路径(会自动创建)。 (2)点击C...
https://www.tsingfun.com/it/tech/749.html 

从Code Review 谈如何做技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...讨论的过程中,居然发现有个“因为对方用户的设置”我无法回复了(我被拉黑了,还有一些直接就是冷讽和骂人了,微博中我就直接删除了)。这些批评我的阿里工程师/架构师的观点总结一下如下:(顺便说一下,阿里内还...
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Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...bash在这方面很弱,比如说: 它的函数只能返回字串,无法返回数组 它不支持面向对象,你无法实现一些优雅的设计模式 它是解释型的,一边解释一边执行,连PHP那种预编译都不是,如果你的脚本包含错误(例如调用了不存...
https://www.tsingfun.com/it/tech/1894.html 

Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...常量定义类似于函数式编程语言中的变量,一次赋值后就无法修改。多多使用有益健康。 一个常量或变量必须与赋值时拥有相同的类型。因此你不用严格定义类型。提供一个值就可以创建常量或变量,并让编译器推断其类型...
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Is it abusive to use IDisposable and “using” as a means for getting “scoped behavior” for exception

... I don't think so, necessarily. IDisposable technically is meant to be used for things that have non-managed resources, but then the using directive is just a neat way of implementing a common pattern of try .. finally { dispose }. A purist would argue 'yes - it's...
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Optimizing away a “while(1);” in C++0x

...sume we have the following loops, where count and count2 are global variables (or have had their address taken), and p is a local variable, whose address has not been taken: for (p = q; p != 0; p = p -> next) { ++count; } for (p = q; p != 0; p = p -> next) { ++count2; } Coul...
https://www.tsingfun.com/it/tech/900.html 

移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...通过window.innerWidth 来获取,但在Android 2, Oprea mini 和 UC 8中无法正确获取。 现在我们已经有两个viewport了:layout viewport 和 visual viewport。但浏览器觉得还不够,因为现在越来越多的网站都会为移动设备进行单独的设计,所...