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，我遇到了一个问题，它使用了更多的内存，在 iPhone 进入睡眠模式并再次唤醒后，我的应用程序在附件完全通过身份验证后无法打开与附件的会话。在调试类 EAAccessoryManager 后，我看到两个相同的设备，它们都是我的附件。转到设置/常规/关于，我发现 iphone 在那里显示两个相同的设备。但是我的问题只出现在iPhone 3G（iOS 4.1版本）上，iPhone 3GS（iOS 4.1）没有这个问题。我猜是因为我的程序使用了太多内存，所以我无法获取附件DidDisconnect 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];
}
}