彩世界开奖app官网-彩世界平台官方网址(彩票平台)
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来自 前端技术 2019-11-28 11:52 的文章
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iOS获取道具IP地址【彩世界平台官方网址】

想看原稿之处在这间

Reference

近几年在做二个有线传输 看录像的小demo,等写完了传上来。然后要求拿到道具的ip地址。

int sum;

View Code

1.后生可畏旦您想获得有线的iP地址。流量的话就是特别了。

#import <ifaddrs.h>  
#import <arpa/inet.h>  

// Get IP Address  
- (NSString *)getIPAddress {      
    NSString *address = @"error";  
    struct ifaddrs *interfaces = NULL;  
    struct ifaddrs *temp_addr = NULL;  
    int success = 0;  
    // retrieve the current interfaces - returns 0 on success  
    success = getifaddrs(&interfaces);  
    if (success == 0) {  
        // Loop through linked list of interfaces  
        temp_addr = interfaces;  
        while(temp_addr != NULL) {  
            if(temp_addr->ifa_addr->sa_family == AF_INET) {  
                // Check if interface is en0 which is the wifi connection on the iPhone  
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {  
                    // Get NSString from C String  
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];                 
                }  
            }  
            temp_addr = temp_addr->ifa_next;  
        }  
    }  
    // Free memory  
    freeifaddrs(interfaces);  
    return address;  

%c用来输入输出字符;

彩世界平台官方网址 1彩世界平台官方网址 2

2.万风华正茂您想博得内网的IP地址。

#import <ifaddrs.h>
#import <arpa/inet.h>
#import <net/if.h>
#define IOS_CELLULAR    @"pdp_ip0"
#define IOS_WIFI        @"en0"
#define IOS_VPN         @"utun0"
#define IP_ADDR_IPv4    @"ipv4"
#define IP_ADDR_IPv6    @"ipv6"
#pragma mark - 获取设备当前网络IP地址
  (NSString *)getIPAddress:(BOOL)preferIPv4
{
    NSArray *searchArray = preferIPv4 ?
    @[ IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6 ] :
    @[ IOS_VPN @"/" IP_ADDR_IPv6, IOS_VPN @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4 ] ;

    NSDictionary *addresses = [self getIPAddresses];
    NSLog(@"addresses: %@", addresses);

    __block NSString *address;
    [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
     {
         address = addresses[key];
         //筛选出IP地址格式
         if([self isValidatIP:address]) *stop = YES;
     } ];
    return address ? address : @"0.0.0.0";
}
  (BOOL)isValidatIP:(NSString *)ipAddress {
    if (ipAddress.length == 0) {
        return NO;
    }
    NSString *urlRegEx = @"^([01]?\d\d?|2[0-4]\d|25[0-5])\."
    "([01]?\d\d?|2[0-4]\d|25[0-5])\."
    "([01]?\d\d?|2[0-4]\d|25[0-5])\."
    "([01]?\d\d?|2[0-4]\d|25[0-5])$";

    NSError *error;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:urlRegEx options:0 error:&error];

    if (regex != nil) {
        NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];

        if (firstMatch) {
            NSRange resultRange = [firstMatch rangeAtIndex:0];
            NSString *result=[ipAddress substringWithRange:resultRange];
            //输出结果
            NSLog(@"%@",result);
            return YES;
        }
    }
    return NO;
}
  (NSDictionary *)getIPAddresses
{
    NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:8];

    // retrieve the current interfaces - returns 0 on success
    struct ifaddrs *interfaces;
    if(!getifaddrs(&interfaces)) {
        // Loop through linked list of interfaces
        struct ifaddrs *interface;
        for(interface=interfaces; interface; interface=interface->ifa_next) {
            if(!(interface->ifa_flags & IFF_UP) /* || (interface->ifa_flags & IFF_LOOPBACK) */ ) {
                continue; // deeply nested code harder to read
            }
            const struct sockaddr_in *addr = (const struct sockaddr_in*)interface->ifa_addr;
            char addrBuf[ MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) ];
            if(addr && (addr->sin_family==AF_INET || addr->sin_family==AF_INET6)) {
                NSString *name = [NSString stringWithUTF8String:interface->ifa_name];
                NSString *type;
                if(addr->sin_family == AF_INET) {
                    if(inet_ntop(AF_INET, &addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv4;
                    }
                } else {
                    const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)interface->ifa_addr;
                    if(inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv6;
                    }
                }
                if(type) {
                    NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
                    addresses[key] = [NSString stringWithUTF8String:addrBuf];
                }
            }
        }
        // Free memory
        freeifaddrs(interfaces);
    }
    return [addresses count] ? addresses : nil;
}

int sum;

示范地址:

3.公网的IP

//方法一:
NSError *error; 
NSURL *ipURL = [NSURL URLWithString:@"http://ifconfig.me/ip"];
NSString *ip = [NSString stringWithContentsOfURL:ipURL encoding:NSUTF8StringEncoding error:&error];
//方法二:个人推荐用这个请求,速度比较快
/*
http://ipof.in/json
http://ipof.in/xml
http://ipof.in/txt
If you want HTTPS you can use the same URLs with https prefix. The advantage being that even if you are on a Wifi you will get the public address.
 */
NSError *error; 
NSURL *ipURL = [NSURL URLWithString:@"http://ipof.in/txt"];
NSString *ip = [NSString stringWithContentsOfURL:ipURL encoding:NSUTF8StringEncoding error:&error];

int sum;

  1 <html lang="en">
  2 <head>
  3     <meta charset="UTF-8">
  4     <title>CSS动画圣诞雪景球</title>
  5     <embed src="age/sd.mp3" autostart="true" loop="-1" controls="ControlPanel" width="0" height="0">
  6 <style type="text/css">
  7 @charset "UTF-8";
  8 body{
  9     background:#4bb093;
 10 }
 11 ul,ol,li{
 12     list-style-type:none;
 13 }
 14 body,div,ul,li,p{ margin:0; padding:0;}
 15 img{border:0;}
 16 .snow_globe{
 17     width: 400px;
 18     height: 400px;
 19     margin:100px auto;
 20     position: relative;
 21 }
 22 .circular_white{
 23     width: 400px;
 24     height: 400px;
 25     border-radius:100%;
 26     position: absolute;
 27     background:rgba(255, 255, 255, 0.5);
 28 }
 29 .cir_cen{
 30     width: 380px;
 31     height: 380px;
 32     z-index: 3;
 33     margin-top: 10px;
 34     margin-left: 10px;
 35     display: inline-block;
 36     border-radius:100%;
 37     position: absolute;
 38     background: -webkit-linear-gradient(top, rgba(255, 255, 255, 0) 68%, #f5f5f5 68%, #ebeff5 79%, #c7d7e0 100%);
 39 }
 40 .step{
 41     width: 356px;
 42     height: 40px;
 43     background: #fff;
 44     position: relative;
 45     top: 236px;
 46     border-radius: 100%;
 47     margin: auto;
 48 }
 49 .son_btm{
 50     width: 110px;
 51     height: 110px;
 52     margin:150px 0 0 135px;
 53     border-radius: 100%;
 54     position: absolute;
 55     background:#fff;
 56     box-shadow: -5px 10px 20px -10px #cccccc;
 57     z-index: 99;
 58 }
 59 .son_top{
 60     width: 80px;
 61     height: 80px;
 62     margin:90px 0 0 150px;
 63     border-radius: 100%;
 64     position: absolute;
 65     background:#fff;
 66     z-index: 99;
 67 }
 68 .eye{
 69     width: 6px;
 70     height: 6px;
 71     z-index:99;
 72     background:#613900;
 73     border-radius:100%;
 74     margin-top: 110px;
 75     margin-left: 170px;
 76     position: absolute;
 77 }
 78 .eye_2{
 79     width: 8px;
 80     height: 8px;
 81     z-index: 99;
 82     background: #613900;
 83     border-radius: 100%;
 84     margin-top: 108px;
 85     margin-left: 190px;
 86     position: absolute;
 87 }
 88 .nose{
 89     background-color: transparent;
 90     display: inline-block;
 91     position: absolute;
 92     top: 120px;
 93     left: 140px;
 94     border-top: 8px solid transparent;
 95     border-bottom: 8px solid transparent;
 96     border-right: 40px solid #f97d00;
 97     border-radius: 30px;
 98     z-index: 99;
 99 }
100 .scarf{
101     width: 70px;
102     height: 10px;
103     background-color: #ec4800;
104     position: absolute;
105     top: 150px;
106     left: 155px;
107     z-index: 99;
108     transform: rotate(3deg);
109     border-radius: 30%;
110 }
111 .scarf_2{
112     width: 10px;
113     height: 30px;
114     background-color: #d34100;
115     display: inline-block;
116     position: absolute;
117     top: 145px;
118     left: 200px;
119     z-index: 99;
120     transform: rotate(-25deg);
121     border-radius: 30%;
122 }
123 .hat{
124 width: 100px;
125     height: 15px;
126     border-radius: 50%;
127     background-color: #613900;
128     position: absolute;
129     z-index: 99;
130     top: 90px;
131     left: 145px;
132     transform: rotate(10deg);
133 }
134 .hat_2{
135     width: 80px;
136     height: 40px;
137     background-color: #613900;
138     display: inline-block;
139     position: relative;
140     top: -35px;
141     left: 10px;
142 }
143 .ribbon {
144     height: 10px;
145     width: 80px;
146     background-color: #ec4800;
147     position: relative;
148     top: -65px;
149     left: 10px;
150     z-index: 6;
151 }
152 .hat_3{
153     z-index: 5;
154     display: inline-block;
155     position: relative;
156     top: -100px;
157     left: 10px;
158     width: 80px;
159     height: 5px;
160     border-radius: 50%;
161     background-color: #3b2200;
162 }
163 .shape{
164     width: 5px;
165     height: 5px;
166     margin-top: 140px;
167     margin-left: 50px;
168     z-index: 99;
169     border-radius: 100%;
170     position: absolute;
171     border-radius:100%;
172     box-shadow: 119px 0px 0px 0px #ed5614, 125px 2px 0px 0px #ed5614, 132px 2px 0px 0px #ed5614, 138px -2px 0px 0px #ed5614;
173 }
174 .shape_1{
175     width: 10px;
176     height: 10px;
177     margin-top: 160px;
178     margin-left: 50px;
179     z-index: 99;
180     position: absolute;
181     border-radius: 100%;
182     box-shadow: 130px 15px 0px -2px #613900, 130px 28px 0px -1px #613900, 130px 41px 0px 0px #613900, 130px 55px 0px 0px #613900;
183 }
184 
185 
186 .snowflake{
187   overflow: hidden;
188 }
189 
190 .snow {
191   width: 380px;
192   height: 350px;
193   border-radius: 100%;
194   position: absolute;
195   top: 10px;
196   left: 10px;
197   overflow: hidden;
198   opacity: 0.8;
199 }
200 /* 雪花是胡乱写的... 这个方法模仿自http://codepen.io/chilliconcode/pen/rWpvOe */
201 .snow_1 {
202     color: #fff;
203     opacity: 0.5;
204     animation: sfanim linear 30s;
205     -webkit-animation: sfanim linear 30s;
206     animation-iteration-count: infinite;
207     -webkit-animation-iteration-count: infinite;
208     text-shadow:0px 20px, -6px 20px, -13px 20px, -20px 18px, -19px 20px, 380px 171px, 550px 80px, 269px 50px, 20px 151px, 221px 344px, 229px 136px, 237px 280px, 303px 30px, 211px 314px, 378px 285px, 388px 117px, 70px 295px, 149px 318px, 96px 66px, 129px 217px, 138px 218px, 241px 310px, 231px 368px, 18px 327px, 173px 213px, 118px 10px, 246px 208px, 159px 244px, 268px 376px, 167px 262px, 85px 238px, 277px 47px, 386px 192px, 259px 364px, 325px 327px, 279px 201px, 303px 517px, 32px 489px, 323px 519px, 98px 583px, 126px 635px, 0px 571px, 380px 461px, 269px 417px, 0px 551px, 121px 744px, 229px 536px, 237px 680px, 303px 430px, 211px 714px, 378px 685px, 10px 687px, 93px 745px, 292px 724px, 223px 692px, 156px 560px, 253px 458px, 205px 595px, 145px 506px, 79px 712px, 182px 759px, 279px 499px, 349px 524px, 5px 433px, 216px 547px,120px 666px, 50px 666px, 214px 421px, 364px 404px, 202px 652px, 354px 632px, 312px 500px;
209 }
210 
211 .snow_2 {
212     color: #fff;
213     animation: sfanim linear 15s;
214     -webkit-animation: sfanim linear 15s;
215     animation-iteration-count: infinite;
216     -webkit-animation-iteration-count: infinite;
217     text-shadow: 600px 500px, 50px 625px, 351px 741px, 20px 632px, 250px 652px, 388px 698px, 235px 762px, 50px 714px, 385px 742px, 185px 635px, 156px 560px, 364px 485px, 340px 620px, 394px 428px, 187px 748px, 217px 624px, 356px 630px, 33px 758px, 238px 762px, 357px 586px, 253px 798px, 68px 786px, 164px 662px, 119px 598px, 221px 557px, 126px 537px, 282px 503px, 11px 455px, 219px 632px, 60px 597px, 41px 529px, 247px 451px, 217px 644px, 304px 400px, 214px 421px, 287px 757px, 76px 404px, 376px 735px, 169px 572px, 245px 790px, 66px 717px, 375px 85px, 11px 289px, 254px 384px, 5px 286px, 266px 305px, 388px 298px, 180px 307px, 36px 13px, 74px 295px, 238px 290px, 384px 235px, 1px 294px, 45px 138px, 131px 350px, 258px 120px, 157px 305px, 96px 349px, 325px 319px, 132px 288px, 167px 111px,  41px 129px, 247px 51px, 217px 244px, 304px 0px, 214px 21px, 287px 357px, 76px 4px, 376px 335px, 169px 172px, 245px 390px, 66px 317px;
218 }
219 
220 @keyframes sfanim {
221   0% {
222     -webkit-transform: translate(0px, -500px);
223             transform: translate(0px, -500px);
224   }
225   100% {
226     -webkit-transform: translate(0px, 100px);
227             transform: translate(0px, 100px);
228   }
229 }
230 
231 @-webkit-keyframes sfanim {
232   0% {
233     -webkit-transform: translate(0px, -500px);
234             transform: translate(0px, -500px);
235   }
236   100% {
237     -webkit-transform: translate(0px, 100px);
238             transform: translate(0px, 100px);
239   }
240 }
241 .toum {
242     width: 400px;
243     height: 400px;
244     border-radius: 100%;
245     position: absolute;
246     background:linear-gradient(315deg, rgba(255, 255, 255,0.9) 0%, rgba(253, 251, 251, 0.2) 47%, rgb(191, 253, 239) 100%);
247     background:-webkit-linear-gradient(315deg, rgba(255, 255, 255,0.9) 0%, rgba(253, 251, 251, 0.2) 47%, rgb(191, 253, 239) 100%); 
248 }
249 
250 .arch {
251     width: 560px;
252     height: 133.33333px;
253     position: absolute;
254     bottom: -342px;
255     margin-left: -80px;
256     position: relative;
257     -webkit-clip-path: polygon(30% 10%, 70% 10%, 80% 100%, 20% 100%);
258     z-index: 99999;
259     overflow: hidden;
260 }
261 .arch_1 {
262     height: 180px;
263     width: 400px;
264     border-radius: 100%;
265     border: 20px solid #ffcb12;
266     position: absolute;
267     bottom: 74px;
268     left: 60px;
269 }
270 .arch_2 {
271     height: 180px;
272     width: 400px;
273     border-radius: 100%;
274     border: 40px solid #ebbb11;
275     position: absolute;
276     bottom: 35px;
277     left: 46px;
278 }
279 .shadow{
280     width: 400px;
281     height: 40px;
282     background: #449e85;
283     position: relative;
284     top: 280px;
285     border-radius: 100%;
286     margin: auto;
287 }
288 </style>
289 </head>
290 <body>
291 <div class="snow_globe">
292     <div class="circular_white"></div>
293     <div class="cir_cen">
294         <div class="step"></div>
295     </div>
296     <div class="snowman">
297         <div class="son_btm"></div>
298         <div class="son_top"></div>
299         <div class="shape"></div>
300         <div class="shape_1"></div>
301         <div class="hat">
302             <div class="hat_2"></div>
303             <div class="ribbon"></div>
304             <div class="hat_3"></div>
305         </div>
306         <div class="eye"></div>
307         <div class="eye_2"></div>
308         <div class="nose"></div>
309         <div class="scarf"></div>
310         <div class="scarf_2"></div>
311     </div>
312     <div class="snowflake">
313         <div class="snow">
314           <div class="snow_1">
315             <p>*</p>
316           </div>
317           <div class="snow_2">
318             <p>*</p>
319           </div>
320         </div>
321    </div>
322    <div class="toum"></div>
323     <div class="arch">
324         <div class="arch_1"></div>
325         <div class="arch_2"></div>
326     </div>
327     <div class="shadow"></div>
328 </div>
329 
330 </body>
331 </html>

新近在做叁个有线传输 看录像的小demo,等写完了传上来。然后须要得到器械的ip地址。

用单引号‘ ‘表示字符的字面量:’a‘,’1‘;即ASCLL码表中的量值;例:’1‘==49;

  

Reference

博客
overflow

  • “学Computer应当要有三个可怜有力的观念状态,计算机不是黑法力,都是人想出来的,外人能够想的出来,那么,有朝一日,小编也能够想的出来。”
  • 指针类型的变量正是保存地址的变量。
  • int* p=&i;------P是一个指南针,P里面包车型大巴剧情为变量i的地址,即说P指向了i;
  • int* p,q;------注意:*号只是加给了p,即语句意思为p为指针,而q为平时的平头类型;(c语言中无int* 这几个种类卡塔尔国
  • %P:指针类型格式;
  • 运算符*:单目运算符,用来拜谒指针的值所表示之处上的变量;即地址 *=变量的值;那时变量的值*i能够用来做左值和右值;
  • 分别:仅仅传递值得时候,传递得只是表面包车型地铁参数值的轻重,地址值上的变量的值并未有改观;而利用*号运算符之后,则被付与了访谈的力量,即读和写的技术,当时能够转移地址所在之处上的变量的值。
  • 函数参数表里面包车型大巴数组,实质为指针,即数组的地点值;
  • 等价的多样函数原型:

自然想多做几个了 无可奈何近来太忙 于是模仿做了二个在codepen见到的圣诞雪景球   算是送给自个儿的圣诞礼物

2.若是您想获得内网的IP地址。

#import <ifaddrs.h>
#import <arpa/inet.h>
#import <net/if.h>
#define IOS_CELLULAR    @"pdp_ip0"
#define IOS_WIFI        @"en0"
#define IOS_VPN         @"utun0"
#define IP_ADDR_IPv4    @"ipv4"
#define IP_ADDR_IPv6    @"ipv6"
#pragma mark - 获取设备当前网络IP地址
  (NSString *)getIPAddress:(BOOL)preferIPv4
{
    NSArray *searchArray = preferIPv4 ?
    @[ IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6 ] :
    @[ IOS_VPN @"/" IP_ADDR_IPv6, IOS_VPN @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4 ] ;

    NSDictionary *addresses = [self getIPAddresses];
    NSLog(@"addresses: %@", addresses);

    __block NSString *address;
    [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
     {
         address = addresses[key];
         //筛选出IP地址格式
         if([self isValidatIP:address]) *stop = YES;
     } ];
    return address ? address : @"0.0.0.0";
}
  (BOOL)isValidatIP:(NSString *)ipAddress {
    if (ipAddress.length == 0) {
        return NO;
    }
    NSString *urlRegEx = @"^([01]?\d\d?|2[0-4]\d|25[0-5])\."
    "([01]?\d\d?|2[0-4]\d|25[0-5])\."
    "([01]?\d\d?|2[0-4]\d|25[0-5])\."
    "([01]?\d\d?|2[0-4]\d|25[0-5])$";

    NSError *error;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:urlRegEx options:0 error:&error];

    if (regex != nil) {
        NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];

        if (firstMatch) {
            NSRange resultRange = [firstMatch rangeAtIndex:0];
            NSString *result=[ipAddress substringWithRange:resultRange];
            //输出结果
            NSLog(@"%@",result);
            return YES;
        }
    }
    return NO;
}
  (NSDictionary *)getIPAddresses
{
    NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:8];

    // retrieve the current interfaces - returns 0 on success
    struct ifaddrs *interfaces;
    if(!getifaddrs(&interfaces)) {
        // Loop through linked list of interfaces
        struct ifaddrs *interface;
        for(interface=interfaces; interface; interface=interface->ifa_next) {
            if(!(interface->ifa_flags & IFF_UP) /* || (interface->ifa_flags & IFF_LOOPBACK) */ ) {
                continue; // deeply nested code harder to read
            }
            const struct sockaddr_in *addr = (const struct sockaddr_in*)interface->ifa_addr;
            char addrBuf[ MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) ];
            if(addr && (addr->sin_family==AF_INET || addr->sin_family==AF_INET6)) {
                NSString *name = [NSString stringWithUTF8String:interface->ifa_name];
                NSString *type;
                if(addr->sin_family == AF_INET) {
                    if(inet_ntop(AF_INET, &addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv4;
                    }
                } else {
                    const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)interface->ifa_addr;
                    if(inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv6;
                    }
                }
                if(type) {
                    NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
                    addresses[key] = [NSString stringWithUTF8String:addrBuf];
                }
            }
        }
        // Free memory
        freeifaddrs(interfaces);
    }
    return [addresses count] ? addresses : nil;
}
  1. int a[] = {5, 15, 34, 54, 14, 2, 52, 72};
  2. int *p = &a[5];
  3. 则p[-2]为54;
  4. 即[]运算符可以对指针做;

1.倘若您想获得有线的iP地址。流量的话便是特别了。

#import <ifaddrs.h>  
#import <arpa/inet.h>  

// Get IP Address  
- (NSString *)getIPAddress {      
    NSString *address = @"error";  
    struct ifaddrs *interfaces = NULL;  
    struct ifaddrs *temp_addr = NULL;  
    int success = 0;  
    // retrieve the current interfaces - returns 0 on success  
    success = getifaddrs(&interfaces);  
    if (success == 0) {  
        // Loop through linked list of interfaces  
        temp_addr = interfaces;  
        while(temp_addr != NULL) {  
            if(temp_addr->ifa_addr->sa_family == AF_INET) {  
                // Check if interface is en0 which is the wifi connection on the iPhone  
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {  
                    // Get NSString from C String  
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];                 
                }  
            }  
            temp_addr = temp_addr->ifa_next;  
        }  
    }  
    // Free memory  
    freeifaddrs(interfaces);  
    return address;  
  • 数组变量是别有风味的指针,即&a[0],a能够表示地址;然而数组的单元表示的是变量,即a[0],a[1],a[2]等象征变量;
  • []运算符能够对指针做,也能够对数组做;
  • *运算符能够对指针做,也能够对数组做;
  • int b[];--->int *const b;即数组变量不能被赋值,数组是八个不可改造的指针;
  • 例:

3.公网的IP

//方法一:
NSError *error; 
NSURL *ipURL = [NSURL URLWithString:@"http://ifconfig.me/ip"];
NSString *ip = [NSString stringWithContentsOfURL:ipURL encoding:NSUTF8StringEncoding error:&error];
//方法二:个人推荐用这个请求,速度比较快
/*
http://ipof.in/json
http://ipof.in/xml
http://ipof.in/txt
If you want HTTPS you can use the same URLs with https prefix. The advantage being that even if you are on a Wifi you will get the public address.
 */
NSError *error; 
NSURL *ipURL = [NSURL URLWithString:@"http://ipof.in/txt"];
NSString *ip = [NSString stringWithContentsOfURL:ipURL encoding:NSUTF8StringEncoding error:&error];

char是风度翩翩种整数,也是生机勃勃种异常的品类:字符;

int sum;

’‘也是一个字符;

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