0
回答
iPhone 网络连接检测(Wifi,3G,Edge),功能有点像Reachability
利用AWS快速构建适用于生产的无服务器应用程序,免费试用12个月>>>   

      这个类可以用来检测用户是否连接到internet.  用法非常简单,只有一个方法,返回 YES或NO。

一个简单的例子:

if ([Connection isConnected]) {  ...  }   
else {  ...  } 

 

这个类的头文件:

//   
//  Connection.h     
//   
#import <Foundation/Foundation.h>   
#import <SystemConfiguration/SystemConfiguration.h>   
#import <netinet/in.h>   
#import <arpa/inet.h>   
#import <netdb.h>   
  
@interface Connection : NSObject {   
  
}   
  
+ (BOOL) isConnected;   
  
@end 

 

类的实现文件:

//   
//  Connection.m  
//   
  
#import "Connection.h"   
  
@implementation Connection   
  
+ (BOOL) isConnected {   
    // Create zero addy   
    struct sockaddr_in zeroAddress;   
    bzero(&zeroAddress, sizeof(zeroAddress));   
    zeroAddress.sin_len = sizeof(zeroAddress);   
    zeroAddress.sin_family = AF_INET;   
    // Recover reachability flags   
    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);   
    SCNetworkReachabilityFlags flags;   
    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);   
    CFRelease(defaultRouteReachability);   
    if (!didRetrieveFlags) {   
        NSLog(@"Error. Could not recover network reachability flags");   
        return NO;   
    }   
    BOOL isReachable = flags & kSCNetworkFlagsReachable;   
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;   
    BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;   
    NSURL *testURL = [NSURL URLWithString:@"http://www.google.com/"];   
    NSURLRequest *testRequest = [NSURLRequest requestWithURL:testURL  cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20.0];   
    NSURLConnection *testConnection = [[[NSURLConnection alloc] initWithRequest:testRequest delegate:self] autorelease];   
    return ((isReachable && !needsConnection) || nonWiFi) ? (testConnection ? YES : NO) : NO;   
}   
  
@end  

 

最后别忘了添加必要的frameworks: SystemConfiguration and libz.1.1.3.dylib

 

标题中提到的Reachability也具有检测网络的功能。大家可以参考资料:http://www.raddonline.com/blogs/geek-journal/iphone-sdk-testing-network-reachability/

http://developer.apple.com/iphone/library/samplecode/Reachability/index.html


原文链接:http://blog.csdn.net/favormm/article/details/5352656
<无标签>
举报
长平狐
发帖于5年前 0回/121阅
顶部