錯誤同時呼籲audioRouteChangeListenerCallback方法內部目標C法

Question

我用這個代碼來檢查，如果事情或縮小在我的iPhone

void audioRouteChangeListenerCallback (void *inUserData, AudioSessionPropertyID inPropertyID, UInt32 inPropertyValueSize, const void *inPropertyValue) { 
     // ensure that this callback was invoked for a route change 
     if (inPropertyID != kAudioSessionProperty_AudioRouteChange) return; 

     { 
      // Determines the reason for the route change, to ensure that it is not 
      //  because of a category change. 
      CFDictionaryRef routeChangeDictionary = (CFDictionaryRef)inPropertyValue; 

      CFNumberRef routeChangeReasonRef = (CFNumberRef)CFDictionaryGetValue (routeChangeDictionary, CFSTR (kAudioSession_AudioRouteChangeKey_Reason)); 
      SInt32 routeChangeReason; 
      CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason); 

      if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) { 
        //Handle Headset Unplugged 
       NSLog(@"PluggedOut"); 


      } 
      else if (routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable) 
      { 
       //Handle Headset plugged in 
       NSLog(@"Something Plugged In"); 
      } 

} 

的audiojack堵塞，但是當我加入我的目標C法（這在所有運行完美其他代碼），以確定是否插入設備與EXC_BAD_ACCESS錯誤我的讀卡器它endup我試過低於

else if (routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable) 
        { 
         //Handle Headset plugged in 
         NSLog(@"Something Plugged In"); 
    audiotest *test; 
      if([test Checkheadphonestatus] == 1) 
      { 
       NSLog(@"Your iPosReader Connected"); 
      } 
      else if([test Checkheadphonestatus] == 0) 
      { 
       NSLog(@"Connected device was not iPos Reader"); 
      } 
        } 

     } 

代碼的任何建議，將不勝感激。

Answer 1

audiotest *test; 

看起來像你還沒有初始化test。試着用替換它：

audiotest *test = [[audiotest alloc] init]; 

另外，作爲一個側面說明，這是一個Objective-C的約定來PascalCase你的類名和駝峯你的方法名。例如：

AudioTest *test = [[AudioTest alloc] init]; 
int status = [test checkHeadphoneStatus];