i have tried to use the reachability-project published by apple to detect a reachability in an own example. i copied the most initialization, but i get this failure in the linker:

Ld build/switchViews.build/Debug-iphoneos/test.build/Objects-normal/armv6/test normal armv6 cd /Users/uid04100/Documents/TEST setenv IPHONEOS_DEPLOYMENT_TARGET 3.1.3 setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.3.sdk -L/Users/uid04100/Documents/TEST/build/Debug-iphoneos -F/Users/uid04100/Documents/TEST/build/Debug-iphoneos -filelist /Users/uid04100/Documents/TEST/build/switchViews.build/Debug-iphoneos/test.build/Objects-normal/armv6/test.LinkFileList -dead_strip -miphoneos-version-min=3.1.3 -framework Foundation -framework UIKit -framework CoreGraphics -o /Users/uid04100/Documents/TEST/build/switchViews.build/Debug-iphoneos/test.build/Objects-normal/armv6/test

Undefined symbols:
"_SCNetworkReachabilitySetCallback", referenced from: -[Reachability startNotifer] in Reachability.o
"_SCNetworkReachabilityCreateWithAddress", referenced from: +[Reachability reachabilityWithAddress:] in Reachability.o
"_SCNetworkReachabilityScheduleWithRunLoop", referenced from: -[Reachability startNotifer] in Reachability.o
"_SCNetworkReachabilityGetFlags", referenced from: -[Reachability connectionRequired] in Reachability.o -[Reachability currentReachabilityStatus] in Reachability.o
"_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from: -[Reachability stopNotifer] in Reachability.o
"_SCNetworkReachabilityCreateWithName", referenced from: +[Reachability reachabilityWithHostName:] in Reachability.o ld: symbol(s) not found collect2: ld returned 1 exit status

my delegate.h:

import

@class Reachability;

@interface testAppDelegate : NSObject { UIWindow *window; UINavigationController *navigationController;

Reachability* hostReach; Reachability* internetReach; Reachability* wifiReach;

}

@property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UINavigationController *navigationController;

@end

my delegate.m:

import "testAppDelegate.h"

import "SecondViewController.h"

import "Reachability.h"

@implementation testAppDelegate

@synthesize window; @synthesize navigationController;

• (void) updateInterfaceWithReachability: (Reachability*) curReach { if(curReach == hostReach) { BOOL connectionRequired= [curReach connectionRequired];

  if(connectionRequired)
  { //in these brackets schould be some code with sense, if i´m getting it to run
  }
  else
  {
  }
  

  } if(curReach == internetReach) { } if(curReach == wifiReach) { } }

//Called by Reachability whenever status changes. - (void) reachabilityChanged: (NSNotification* )note { Reachability* curReach = [note object]; NSParameterAssert([curReach isKindOfClass: [Reachability class]]); [self updateInterfaceWithReachability: curReach]; }

• (void)applicationDidFinishLaunching:(UIApplication *)application {
  // Override point for customization after application launch // Observe the kNetworkReachabilityChangedNotification. When that notification is posted, the // method "reachabilityChanged" will be called. //
  [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];

  //Change the host name here to change the server your monitoring hostReach = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain]; [hostReach startNotifer]; [self updateInterfaceWithReachability: hostReach];

  internetReach = [[Reachability reachabilityForInternetConnection] retain]; [internetReach startNotifer]; [self updateInterfaceWithReachability: internetReach];

  wifiReach = [[Reachability reachabilityForLocalWiFi] retain]; [wifiReach startNotifer]; [self updateInterfaceWithReachability:wifiReach]; [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; }

• (void)dealloc { [navigationController release]; [window release]; [super dealloc]; }

@end