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Postfix发信的频率控制几个参数 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...成后，若向外网发送一封地址错误或不可到达的邮件，则默认情况下它会无限次数的重试，结果就导致磁盘被重试邮件日志占满，网络流量也会被浪费，更严重这会被认为是网络攻击而导致服务器或IP被封。因此需要通过一些参...
Specifying and saving a figure with exact size in pixels
...o show a figure of that size (matplotlib requires the figure to fit in the screen, if you ask for a size too large it will shrink to the screen size). Let's imagine you want an 800x800 pixel image just for an example. Here's how to show an 800x800 pixel image in my monitor (my_dpi=96):
plt.figure(f...
Why is semicolon allowed in this python snippet?
...e shell, IDLE, ipython) the value of the last expression is printed to the screen and usually this is the intended behavior.
Using an expression for side effects
But in some cases you want to evaluate an expression for its side effects only, e.g., to see the results of your simulation plotted by m...
IllegalStateException: Can not perform this action after onSaveInstanceState with ViewPager
... of onStop, that line of code wont do things and thus show nothing on your screen. When users come back to the application, they will see an empty screen, that's the empty host activity showing no fragments at all. It's bad experience(yeah a little bit better than a crash).
So here I wish there cou...
CentOS 6.4下Squid代理服务器的安装与配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...s 开机启动
# chkconfig iptables on
6.4 修改客户端IP地址
将默认网关设置为squid 服务器的内网ip地址。
6.5 在浏览器中，取消代理设置
6.6 测试
透明代理测试成功。
七、反向代理服务
为Internet用户访问企业Web站点提供缓存...
linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...介
1.查看是否已安装squid
Red Hat Enterprise Linux 5安装程序默认没有安装Squid
服务，读者可以使用下面的命令检查系统是否已经安装了
Squid服务或查看已经安装了何种版本。
rpm -q squid
2.Squid代理服务的基本配置
2.1 Squid主配置...
How to manually create icns files using iconutil?
...e .icns file, which will make your app icon look beautiful on every single screen, from a cheap iPhone SE to some high-end Retina display of the latest iMac. You can use Photoshop, GIMP or any other tool of your choice to generate these PNGs.
From the latest Apple's Human Interface Guidelines as of ...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...摸事件派发超时ANR，一般阈值为5s（设置中开启ANR弹窗，默认有事件派发才会触发弹框ANR）；
广播阻塞ANR，一般阈值为10s（设置中开启ANR弹窗，默认不弹框，只有log提示）；
服务超时ANR，一般阈值为20s（设置中开启ANR弹...
How to detect that animation has ended on UITableView beginUpdates/endUpdates?
...lso get called when a cell that is already in the table moves from off the screen to on the screen so it may not be exactly what you are looking for. I just looked through all the UITableView and UIScrollView delegate methods and there doesnt appear to be anything to handle just after a cell is ins...
How can I recognize touch events using jQuery in Safari for iPad? Is it possible?
... too) it now contains an array of all the touches the user has made on the screen. Each touch has its own properties (x,y coords for example)
– David Pean
Jan 21 '11 at 6:05
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