关于在iOS设备上探测WIFI,3G,GPRS使用情况的细节
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http://blog.csdn.net/devfun/article/details/7365774
由于设计的游戏需要有一些联网请求,但有时候在设备未连接网络的情况下,如果对网络情况不加以判断,则可能造成游戏为了等游戏超时,浪费不必要的时间。
所以在游戏启动时检测一下网络状况是很必要的,而且当玩家的设备连接上网络以后,有一个回调函数也是非常必要的一件事儿,这样可能更方便我们在后台下载数据库等信息。apple为我们提供了一套范例代码,下面我就来分析一下这段代码。
范例代码地址在:https://developer.apple.com/library/ios/#samplecode/Reachability/Listings/Classes_ReachabilityAppDelegate_m.html#//apple_ref/doc/uid/DTS40007324-Classes_ReachabilityAppDelegate_m-DontLinkElementID_4
范例中包含两部分,一部分是appdelegate,一部分是reachability
- #import <sys/socket.h>
- #import <netinet/in.h>
- #import <netinet6/in6.h>
- #import <arpa/inet.h>
- #import <ifaddrs.h>
- #import <netdb.h>
- #import <CoreFoundation/CoreFoundation.h>
- #import "Reachability.h"
- #define kShouldPrintReachabilityFlags 1
- static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, const char* comment)
- {
- #if kShouldPrintReachabilityFlags
- NSLog(@"Reachability Flag Status: %c%c %c%c%c%c%c%c%c %s\n",
- (flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-',//当前网络为蜂窝网络,即3G或者GPRS
- (flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-',//网络请求地址可达
- (flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-',
- (flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-',
- (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-',
- (flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-',
- (flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-',
- (flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-',//该值为一个本地地址
- (flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-',
- comment
- );
- #endif
- }
- @implementation Reachability
- static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info)
- {
- #pragma unused (target, flags)
- NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback");
- NSCAssert([(NSObject*) info isKindOfClass: [Reachability class]], @"info was wrong class in ReachabilityCallback");
- //We're on the main RunLoop, so an NSAutoreleasePool is not necessary, but is added defensively
- // in case someon uses the Reachablity object in a different thread.
- NSAutoreleasePool* myPool = [[NSAutoreleasePool alloc] init];
- Reachability* noteObject = (Reachability*) info;
- // Post a notification to notify the client that the network reachability changed.
- [[NSNotificationCenter defaultCenter] postNotificationName: kReachabilityChangedNotification object: noteObject];
- [myPool release];
- }
- //启动探测网络
- - (BOOL) startNotifier
- {
- BOOL retVal = NO;
- SCNetworkReachabilityContext context = {0, self, NULL, NULL, NULL};
- //SCNetworkReachabilitySetCallback函数为指定一个target(此处为reachabilityRef,即www.apple.com,在reachabilityWithHostName里设置的)
- //当设备对于这个target链接状态发生改变时(比如断开链接,或者重新连上),则回调reachabilityCallback函数,
- if(SCNetworkReachabilitySetCallback(reachabilityRef, ReachabilityCallback, &context))
- {
- //指定一个runloop给指定的target
- if(SCNetworkReachabilityScheduleWithRunLoop(reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode))
- {
- retVal = YES;
- }
- }
- return retVal;
- }
- //停止网络探测
- - (void) stopNotifier
- {
- if(reachabilityRef!= NULL)
- {
- SCNetworkReachabilityUnscheduleFromRunLoop(reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
- }
- }
- - (void) dealloc
- {
- [self stopNotifier];
- if(reachabilityRef!= NULL)
- {
- CFRelease(reachabilityRef);
- }
- [super dealloc];
- }
- //通过域名设定一个目标地址比如www.apple.com
- + (Reachability*) reachabilityWithHostName: (NSString*) hostName;
- {
- Reachability* retVal = NULL;
- SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]);
- if(reachability!= NULL)
- {
- retVal= [[[self alloc] init] autorelease];
- if(retVal!= NULL)
- {
- retVal->reachabilityRef = reachability;
- retVal->localWiFiRef = NO;
- }
- }
- return retVal;
- }
- //通过ip地址设定一个目标的地址,可以加端口号,貌似我实验的不太成功
- + (Reachability*) reachabilityWithAddress: (const struct sockaddr_in*) hostAddress;
- {
- SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)hostAddress);
- Reachability* retVal = NULL;
- if(reachability!= NULL)
- {
- retVal= [[[self alloc] init] autorelease];
- if(retVal!= NULL)
- {
- retVal->reachabilityRef = reachability;
- retVal->localWiFiRef = NO;
- }
- }
- return retVal;
- }
- //检测当前网络能否连上internet
- + (Reachability*) reachabilityForInternetConnection;
- {
- struct sockaddr_in zeroAddress;
- bzero(&zeroAddress, sizeof(zeroAddress));
- zeroAddress.sin_len = sizeof(zeroAddress);
- zeroAddress.sin_family = AF_INET;
- return [self reachabilityWithAddress: &zeroAddress];
- }
- //检测当前网络是否能够连上本地wifi
- + (Reachability*) reachabilityForLocalWiFi;
- {
- struct sockaddr_in localWifiAddress;
- bzero(&localWifiAddress, sizeof(localWifiAddress));
- localWifiAddress.sin_len = sizeof(localWifiAddress);
- localWifiAddress.sin_family = AF_INET;
- // IN_LINKLOCALNETNUM is defined in <netinet/in.h> as 169.254.0.0
- localWifiAddress.sin_addr.s_addr = htonl(IN_LINKLOCALNETNUM);
- Reachability* retVal = [self reachabilityWithAddress: &localWifiAddress];
- if(retVal!= NULL)
- {
- retVal->localWiFiRef = YES;
- }
- return retVal;
- }
- #pragma mark Network Flag Handling
- - (NetworkStatus) localWiFiStatusForFlags: (SCNetworkReachabilityFlags) flags
- {
- PrintReachabilityFlags(flags, "localWiFiStatusForFlags");
- BOOL retVal = NotReachable;
- if((flags & kSCNetworkReachabilityFlagsReachable) && (flags & kSCNetworkReachabilityFlagsIsDirect))
- {
- retVal = ReachableViaWiFi;
- }
- return retVal;
- }
- //通过flags返回当前网络状态
- - (NetworkStatus) networkStatusForFlags: (SCNetworkReachabilityFlags) flags
- {
- PrintReachabilityFlags(flags, "networkStatusForFlags");
- if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
- {
- // if target host is not reachable
- return NotReachable;
- }
- BOOL retVal = NotReachable;
- if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
- {
- // if target host is reachable and no connection is required
- // then we'll assume (for now) that your on Wi-Fi
- retVal = ReachableViaWiFi;
- }
- if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
- (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
- {
- // ... and the connection is on-demand (or on-traffic) if the
- // calling application is using the CFSocketStream or higher APIs
- if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
- {
- // ... and no [user] intervention is needed
- retVal = ReachableViaWiFi;
- }
- }
- if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
- {
- // ... but WWAN connections are OK if the calling application
- // is using the CFNetwork (CFSocketStream?) APIs.
- retVal = ReachableViaWWAN;
- }
- return retVal;
- }
- - (BOOL) connectionRequired;
- {
- NSAssert(reachabilityRef != NULL, @"connectionRequired called with NULL reachabilityRef");
- SCNetworkReachabilityFlags flags;
- if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags))
- {
- return (flags & kSCNetworkReachabilityFlagsConnectionRequired);
- }
- return NO;
- }
- //获得当前网络状态
- - (NetworkStatus) currentReachabilityStatus
- {
- NSAssert(reachabilityRef != NULL, @"currentNetworkStatus called with NULL reachabilityRef");
- NetworkStatus retVal = NotReachable;
- SCNetworkReachabilityFlags flags;
- if (SCNetworkReachabilityGetFlags(reachabilityRef, &flags))
- {
- if(localWiFiRef)
- {
- retVal = [self localWiFiStatusForFlags: flags];
- }
- else
- {
- retVal = [self networkStatusForFlags: flags];
- }
- }
- return retVal;
- }
- @end
以上的部分为具体实现的部分,下面我们再来看在appdelegate里面调用的部分
- - (void) applicationDidFinishLaunching: (UIApplication* )application
- {
- #pragma unused(application)
- contentView.backgroundColor = [UIColor groupTableViewBackgroundColor];
- summaryLabel.hidden = YES;
- //这句是设定一个回调函数reachability,当网络条件发生变化时则去调用reachabilityChanged
- [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];
- //Change the host name here to change the server your monitoring
- remoteHostLabel.text = [NSString stringWithFormat: @"Remote Host: %@", @"www.apple.com"];
- //设定target地址,这里是www.apple.com
- hostReach = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain];
- //启动网络条件检测
- [hostReach startNotifier];
- //更新UI的网络状态显示
- [self updateInterfaceWithReachability: hostReach];
- //探测是否能连上internet网
- internetReach = [[Reachability reachabilityForInternetConnection] retain];
- [internetReach startNotifier];
- [self updateInterfaceWithReachability: internetReach];
- //探测wifi是否开启
- wifiReach = [[Reachability reachabilityForLocalWiFi] retain];
- [wifiReach startNotifier];
- [self updateInterfaceWithReachability: wifiReach];
- [window makeKeyAndVisible];
- }
- //如需要查看网络状态,如下调用即可
- NetworkStatus netStatus = [curReach currentReachabilityStatus];
- netStatus有ReachableViaWWAN(蜂窝网络3G之类的),ReachableViaWiFi(wifi连接),NotReachable(无法连接)
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