block | 易学教程

Only allow certain IP addresses to access site with mod_rewrite?

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问题 We have a directory on our site which we only want to be accessible by a couple of IP addresses. So we have this .htaccess file to try and get it working: RewriteEngine on RewriteCond %(REMOTE_ADDR) !^123\.123\.123\.123 RewriteCond %(REMOTE_ADDR) !^124\.124\.124\.124 RewriteCond %{REMOTE_ADDR} !^125\.125\.125\.125 RewriteCond %{REMOTE_ADDR} !^126\.126\.126\.126 RewriteCond %{REMOTE_ADDR} !^127\.127\.127\.127 RewriteCond %{REMOTE_ADDR} !^128\.128\.128\.128 RewriteCond %{HTTP_REFERER} !^http:/

How to dismiss own view controller and present another view controller in a button tap?

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问题 Let's say I have 3 view controller labeled "A","B" and "C". Right now, "A" is the rootViewController of the window and it presents "B" modally when a button is tapped. In "B", when a button is tapped it is supposed to be dismissed by "A" and then "A" will present C modally immediately.How can one do that? Here's my code in hope of achieving this goal but I was unsuccessful in doing so. At "A" viewController, I declared a property to hold a block at the header file to be called when "B"

toddler safe app on android

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问题 I have an app, that should be toddler safe. Meaning that, it blocks any single key touch, yet handles long pressing for exiting the app. This is so that, the toddler will be safe from doing (too) nasty things while playing. Up to version 2.3.4, I succeeded in achieving this. However, now I have 2 problems: On honeycomb, I have the status bar notifications which can be pressed on. Also , I have the switch-windows key which can be pressed. The only thing I succeeded with it is to dim the status

Passing block into a method - Ruby [duplicate]

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问题 This question already has answers here : Code block passed to each works with brackets but not with 'do'-'end' (ruby) (3 answers) Closed 5 years ago . I have a little question on passing block. def a_method(a, b) a + yield(a, b) end This works fine. k = a_method(1, 2) do |x, y| (x + y) * 3 end puts k But this won't work. puts a_method(1, 2) do |x, y| (x + y) * 3 end # LocalJumpError: no block given (yield) Can anyone kindly explain this to me? Thanks. Example taken from Metaprogramming Ruby

【iOS面试系列-1】iOS中@property 后assign，copy，retain，weak，strong的意义与区别（必考-必须详细掌握）

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来源：网络 assign ：普通（简单）赋值，一般常用于基本数据类型，常见委托设计模式，一次来防止循环引用。不更改索引计数（Reference Counting）。对基础数据类型（NSInteger，CGFloat）和C数据类型（int, float, double, char, 等等） retain ：保留计数，获得到了对象的所有权，引用计数在原有基础上+1.释放旧的对象，将旧对象的值赋予输入对象，再提高输入对象的索引计数为1 。我们给那块内存设一个引用计数，当内存被分配并且赋值给a时，引用计数是1。当把a赋值给b时引用计数增加到 2。这时如果a不再使用这块内存，它只需要把引用计数减1，表明自己不再拥有这块内存。b不再使用这块内存时也把引用计数减1。当引用计数变为0的时候，代表该内存不再被任何指针所引用，系统可以把它直接释放掉。retain之后count加一。alloc之后count就是1，release就会调用dealloc销毁这个对象。如果 retain，需要release两次。通常在method中把参数赋给成员变量时需要retain。NSArray对象会retain(retain值加一)任何数组中的对象。当NSArray被卸载(dealloc)的时候，所有数组中的对象会被执行一次释放(retain值减一)。不仅仅是NSArray，任何收集类(Collection

How can I create my own methods which take a block as an argument and which I can call later?

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问题 How can I create my own methods which take a block as an argument and which I can call later? I have tried following things. #import <UIKit/UIKit.h> typedef void (^viewCreator)(void); @interface blocks2ViewController : UIViewController { } -(void)createButtonUsingBlocks:(viewCreator *)block; @end - (void)viewDidLoad { [super viewDidLoad]; [self createButtonUsingBlocks:^(NSString * name) { UIButton *dummyButton = [[UIButton alloc]initWithFrame:CGRectMake(50, 50, 200, 100)]; dummyButton

How can I create my own methods which take a block as an argument and which I can call later?

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Ban IPs from text file using htaccess

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问题 I read and understand how to block an ip using htaccess: order deny,allow deny from 111.222.33.44 deny from 55.66.77.88 ... allow from all But my list of black IPs includes thousands of IPs. I save all IPs to a blacklist.txt file. Can I use htaccess to call blacklist.txt and block all IPs which are stored in this file? If so, how? 回答1: You can try using variations of RewriteMap. You'll need access to the server/vhost config because that directive only works there. You can then use the map

RT_Thread应用18—内存管理2

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第二十四章内存管理（第二部分）六、静态内存管理的函数接口静态内存管理函数的使用——开发流程：规划一片内存区域作为静态内存池。调用 rt_mp_create()函数。进行静态内存使用前的创建。调用 rt_mp_alloc()函数。系统内部将会从空闲链表中获取第一个空闲块，并返回该块的用户空间地址。调用 rt_mp_free()函数。将该块内存加入空闲块链表，进行内存的释放。对内存池的操作包含：创建 / 初始化内存池、申请内存块、释放内存块、删除 / 脱离内存池，但不是所有的内存池都会被删除，这与设计者的需求相关，但是使用完的内存块都应该被释放。 1、静态内存控制块 1 struct rt_mempool { 2 struct rt_object parent ; /**<继承自 rt_object */ ( 1 ) * * 静态内存会在自身结构体里面包含一个对象类型的成员，通过这个成员可以将内存挂到系统对象容器里面。 * * 3 4 void * start_address ; /**< 内存池起始地址 */ ( 2 ) * * 内存池开始地址 * * 5 rt_size_t size ; /**< 内存池大小 */ ( 3 ) * * 内存池大小 * * 6 7 rt_size_t block_size ; /**< 内存块大小 */ ( 4 ) * *

ThinkPHP模板继承

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<extend name="Base:base"/> <block name="tou"> </block> <block name="neirong"> <div style="width: 100%;height: 500px;background-color: yellow"></div> </block> <!DOCTYPE html> <html> <head> <title></title> <block name="tou"></block> </head> <body> <div style="width:100%;height: 200px;background-color:red"> <foreach name="menu" item="v"> <span>{$v.name}</span> </foreach> </div> <block name="neirong"></block> <div style="width: 100%;height: 100px;background-color: blue"></div> </body> </html> 来源： https://www.cnblogs.com/niushuangmeng/p/8617958.html