ip wifi

百分号的转换，NSString中需要格式化的字符串中百分号使用％％表示，而char＊中百分号也是使用％％表示。

例如：NSLog(@"%%%@%%",@"hello"),控制台会打印出％hello％。

 

//获取IP地址

#import <Foundation/Foundation.h>
#import <stdio.h>
#import <stdlib.h>
#import <math.h>
#import <string.h>
#import <unistd.h>
#import <sys/ioctl.h>
#import <sys/types.h>
#import <sys/sysctl.h>
#import <sys/socket.h>
#import <netinet/in.h>
#import <netdb.h>
#import <arpa/inet.h>
#import <sys/sockio.h>
#import <net/if.h>
#import <net/ethernet.h>
#import <errno.h>
#import <net/if_dl.h>
#import <ifaddrs.h>
#import <mach/machine.h>

+ (NSString *)getIPAddress; // 获取IP
+ (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;
}

//获取当前WIFI名
#import <SystemConfiguration/CaptiveNetwork.h>
+ (NSString *)getWifiName;  //
+ (NSString *)getWifiName
{
    NSString *wifiName = nil;
    
    CFArrayRef wifiInterfaces = CNCopySupportedInterfaces();
    
    if (!wifiInterfaces) {
        return nil;
    }
    
    NSArray *interfaces = (__bridge NSArray *)wifiInterfaces;
    
    for (NSString *interfaceName in interfaces) {
        CFDictionaryRef dictRef = CNCopyCurrentNetworkInfo((__bridge CFStringRef)(interfaceName));
        
        if (dictRef) {
            NSDictionary *networkInfo = (__bridge NSDictionary *)dictRef;
            NSLog(@"network info -> %@", networkInfo);
            wifiName = [networkInfo objectForKey:(__bridge NSString *)kCNNetworkInfoKeySSID];
            
            CFRelease(dictRef);
        }
    }
    
    CFRelease(wifiInterfaces);
    return wifiName;
}

ARC下使用MRC文件  标记编译文件.m -fno-objc-arc

　　　　反之　　　　　　标记文件 -fobjc-arc