Question

我正在开发一个应用程序，它通过UART端口从附件获取数据。当我的应用程序运行很长时间时，我遇到了问题，它使用了更多的内存，在iPhone进入睡眠模式后，再次唤醒，我的应用程序无法在配件完全验证后打开带附件的会话。在我调试类EAAccessoryManager后，我看到两个相同的设备，它们都是我的配件。转到设置/常规/关于，我发现iphone在那里显示两个相同的设备。但我的问题只出现在iPhone 3G（iOS 4.1版）上，iPhone 3GS（iOS 4.1）没有这个问题。我想因为我的程序使用了太多内存所以我无法获得accessoryDidDisconnect事件。请给我一些建议。谢谢你的回答。

-(EASession*) openSessionForProtocol: (NSString*)protocolString
{
     NSArray* accessories = [[EAAccessoryManager sharedAccessoryManager] connectedAccessories];

     EAAccessory* accessory = nil;
     EASession *session = nil;
     for(EAAccessory* obj in accessories){
          if([[obj protocolStrings] containsObject:protocolString]){
               accessory = obj;
               break;
          }
     }
     if(accessory){
          [accessory setDelegate:self];
          session = [[EASession alloc] initWithAccessory:accessory forProtocol:protocolString];
          if(session){
               NSString *msg = @"";
               for(EAAccessory* obj in accessories){
                    msg = [msg stringByAppendingFormat:@"\n%@",[obj name]];
               }
               NSString *openSession = [NSString stringWithFormat:@"The number of devices is: %d.%@",[accessories count],msg];

               UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"OpenSession" message:openSession delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:nil];
               [alert show];
               [alert release];
               [[session inputStream] setDelegate:self];
               [[session inputStream] scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
               [[session inputStream] open];
               [[session outputStream] setDelegate:self];
               [[session outputStream] scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
               [[session outputStream] open];
               [session autorelease];
               iRemoteAppDelegate *appDelegate = (iRemoteAppDelegate *)[[UIApplication sharedApplication] delegate];
               [appDelegate SetApplicationRotation:TRUE];
          }
     }
     return session;
}

- (void)accessoryDidDisconnect:(EAAccessory *)accessory
{
     //[HardwareController performSelectorOnMainThread:@selector(UpdateStringOnMessage:) withObject:@"Can not connect hardware module.\nPlease check hardware again." waitUntilDone:YES];
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message" message:@"Accessory is unpluged!" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:nil];
     [alert show];
     [alert release];
     [[serialSession inputStream] removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
     [[serialSession outputStream] removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];

     [serialSession release];
      self.serialSession = nil;
     iRemoteAppDelegate *delegate = (iRemoteAppDelegate *)[[UIApplication sharedApplication] delegate];
     [delegate setUserCancel:NO];
     AllowedEmitSignal = TRUE;

     [delegate UpdateAboutHardwareDisconnect];
     [delegate SetApplicationRotation:FALSE];
}

- (void)accessoryDidConnect:(NSNotification *) notification
{
     iRemoteAppDelegate *appDelegate = (iRemoteAppDelegate *)[[UIApplication sharedApplication] delegate];
     [appDelegate setUserCancel:NO];
     [self OpenPort];
     AllowedEmitSignal = TRUE;
     [appDelegate UpdateAboutHardwareDisconnect];
     appDelegate.CallNumber = appDelegate.CallNumber+1;
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message" message:[NSString stringWithFormat:@"Accessory is attached!%d",appDelegate.CallNumber] delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:nil];
     [alert show];
     [alert release];
}

-(void)OpenPort
{
     int i =0;
     [self initAllVariable];
     iRemoteAppDelegate *delegate = (iRemoteAppDelegate *)[[UIApplication sharedApplication] delegate];

     for (;self.serialSession==nil && i<2; i++) {
          self.serialSession = [self openSessionForProtocol:PROTOCOLSTRING];
     }
}

Answer 1

如果设置/常规/关于显示两个相同的iPhone 3G设备，这意味着iPhone 3G在睡眠时未能检测到配件的“关闭”状态。你必须确保配件在iPhone 3G睡眠时进入睡眠状态（低功耗状态），在你的配件从3G收到字节后的某一毫秒内告知它正在改变其电源状态。

这里不能说太多秘密。但根据我的经验，iPhone 3G与3GS的电信号行为差异很大。您的问题与iOS应用代码无关。我强烈建议您使用CRO /逻辑分析器调试iPhone 3G发送前的检测引脚状态和命令。

外部配件通知：

1 个答案: