转：iPhone 网络连接检测(Wifi,3G,Edge)代码之一
这个类可以用来检测用户是否连接到internet，只有一个方法，返回YES或NO。功能类似Reachability。类的头文件Connection.h
//
// 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
//
// Connection.m
//
@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
SCNetworkReachabilityRefdefaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
SCNetworkReachabilityFlagsflags;
BOOLdidRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
CFRelease(defaultRouteReachability);
if(!didRetrieveFlags) {
NSLog(@"Error,Could not recover network reachability flags");
return NO;
}
BOOLisReachable = flags & kSCNetworkFlagsReachable;
BOOLneedsConnection = flags&kSCNetworkFlagsConnectionRequired;
BOOLnonWiFi = flags&kSCNetworkReachabilityFlagsTransientConnection;
NSURL*testURL = ;
NSURLRequest*testRequest = ;
NSURLConnection*testConnection = [ initWithRequest:testRequestdelegate: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
示例代码：
if () {......}
else {......}
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