Ios iphone中使用核心电话的呼叫事件

我正在尝试在我的iPhone应用程序中获取呼叫事件。 为此，我试图注册到核心电话通知，但我得到以下错误。我正在iPhone3GS上测试这个

Undefined symbols for architecture armv7:
  "CTTelephonyCenterGetDefault()", referenced from:
  -[CallEventAppDelegate application:didFinishLaunchingWithOptions:] in CallEventAppDelegate.o
ld: symbol(s) not found for architecture armv7

以下是我的示例代码：-

    void (*CTTelephonyCenterAddObserver) (id,id,CFNotificationCallback,NSString*,void*,int);

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
   {

// register for all Core Telephony notifications


id ct = CTTelephonyCenterGetDefault();

CTTelephonyCenterAddObserver(ct,   // center
                             NULL, // observer
                             telephonyEventCallback,  // callback
                             NULL,                    // event name (or all)
                             NULL,                    // object
                             CFNotificationSuspensionBehaviorDeliverImmediately);

return YES;
    }

 static void telephonyEventCallback(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{

NSString *notifyname = (__bridge NSString*)name;
if ([notifyname isEqualToString:@"kCTCallIdentificationChangeNotification"])
{
    NSDictionary* info = (__bridge NSDictionary*)userInfo;
    //CTCall* call = (CTCall*)[[[info objectForKey:@"kCTCall"] stringValue] isEqualToString:@"4"];

    CTCall* call = (CTCall*)[info objectForKey:@"kCTCall"];

    //NSString* caller = CTCallCopyAddress(NULL, call);

    if (call.callState == CTCallStateDisconnected)
    {
        NSLog(@"Call has been disconnected");
    }
    else if (call.callState == CTCallStateConnected)
    {
        NSLog(@"Call has just been connected");
    }
    else if (call.callState == CTCallStateIncoming)
    {
        NSLog(@"Call is incoming");

    }
    else if (call.callState == CTCallStateDialing)
    {
        NSLog(@"Call is Dialing");
    }
    else
    {
        NSLog(@"None of the conditions");
    }
}
 }

---

提前感谢。

您必须包括核心电话框架，并将其导入CalleenTappDelegate中

#导入
#进口
#进口
#进口

我已经包括了所有这些核心电话框架。Wehn我的appdelagate有扩展名.mm，那个时候我得到了上面的错误。当我将其改为.m时，应用程序正在启动，但它崩溃了，我在后续工作中遇到了严重问题。telephonyEventCallback，//callback我更改了代码及其工作方式。现在我在前台收到来电事件，但无法在前台收到来电断开事件。当应用程序处于后台时，我不会收到任何事件。请在这方面帮助/指导我。谢谢

#import <CoreTelephony/CTCall.h>
#import <CoreTelephony/CTCallCenter.h>
#import <CoreTelephony/CTCarrier.h>
#import <CoreTelephony/CTTelephonyNetworkInfo.h>