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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
...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数配置解决，重试一定次数后仍失败的就放弃发送。postfix发信的频率控制有几个:
smtpd_client_connection_rate_limit=5
i...
When to use enumerateObjectsUsingBlock vs. for
... I confirm enumerateObjectsUsingBlock: is still 4X slower on real iPhone 6 iOS9, using Xcode 7.x to build.
– Cœur
Nov 25 '15 at 12:56
...
快速开发CSS的利器LESS 系列教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...效率。less可以说，很好地提升了开发速度。本系列将先为大家介绍基本的less用法，之后进行less具体知识的讲解。
如何使用less
使用less的几个基本要求：
1、要求编辑器能够支持less文件的编译
2、要求html文件能够解析less文件...
Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...些基本实现和调优技术以及一些要避免的常见危险。
为什么要用线程池？
诸如 Web 服务器、数据库服务器、文件服务器或邮件服务器之类的许多服务器应用程序都面向处理来自某些远程来源的大量短小的任务。请求以某种方...
Calculate distance between two latitude-longitude points? (Haversine formula)
...Thanks very much for all this. I used the following code in my Objective-C iPhone app:
const double PIx = 3.141592653589793;
const double RADIO = 6371; // Mean radius of Earth in Km
double convertToRadians(double val) {
return val * PIx / 180;
}
-(double)kilometresBetweenPlace1:(CLLocationC...
刘强东“一元年薪”背后的O2O棋局 - 资讯 - 清泛网 - 专注C/C++及内核技术
...事会今年5月份批准了针对公司董事长兼CEO刘强东的一项为期10年的薪酬计划。计划规定，10年内，刘强东每年只能领到1元现金形式底薪和零元现金形式奖金。
难道刘强东就因此连杯奶茶也买不起了吗？这么想就太天真了。
根...
UIView Infinite 360 degree rotation animation?
...
Found a method (I modified it a bit) that worked perfectly for me: iphone UIImageView rotation
#import <QuartzCore/QuartzCore.h>
- (void) runSpinAnimationOnView:(UIView*)view duration:(CGFloat)duration rotations:(CGFloat)rotations repeat:(float)repeat {
CABasicAnimation* rotation...
Create UIActionSheet 'otherButtons' by passing in array, not varlist
...
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UIPopovercontroller dealloc reached while popover is still visible
...it is managed by the presentation controller.
Code example (works both on iPhone and iPad):
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.allowsEditing = YES;
picker.modalPresent...
Is there a way to iterate over a dictionary?
...e if you're targeting Mac OS X pre-10.5, but you can still use on 10.5 and iPhone) is to use an NSEnumerator:
NSEnumerator *enumerator = [myDict keyEnumerator];
id key;
// extra parens to suppress warning about using = instead of ==
while((key = [enumerator nextObject]))
NSLog(@"key=%@ value=%@...