Application Freezing when calling CocoaAsyncMethod scheduleDequeueRead - iphone

Question

I'm using CocoaAsyncSocket library to create a TCP socket connection. The problem I'm having is after a few library methods are called, I'm getting an error.
appDelegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
socket = [[AsyncSocket alloc] initWithDelegate:self];
NSError *error = nil;
if (![socket connectToHost:#"199.5.83.63" onPort:11005 error:&error])
{
NSLog(#"Error connecting: %#", error);
}
[socket readDataWithTimeout:10 tag:1];
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[tekMatrixViewController alloc] initWithNibName:#"tekMatrixViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
And here are my methods from the CocoaAsyncSocket Library:
- (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
{
NSData *strData = [data subdataWithRange:NSMakeRange(0, [data length])];
NSString *msg = [[NSString alloc] initWithData:strData encoding:NSUTF8StringEncoding];
NSLog(#"RX length: %d", [data length]);
if(msg)
{
NSLog(#"RX:%#",msg);
}
else
{
NSLog(#"Fail");
}
}
- (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err
{
NSLog(#"error - disconnecting");
//start reconnecting procedure here...
}
- (void)onSocketDidDisconnect:(AsyncSocket *)sock
{
NSLog(#"disconnected");
}
- (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port
{
NSLog(#"connected");
}
When I run my app in the simulator, this is what my output log spits out:
2012-06-08 13:17:30.808 tekMatrix[2793:f803] connected
2012-06-08 13:17:30.815 tekMatrix[2793:f803] RX length: 8
2012-06-08 13:17:30.816 tekMatrix[2793:f803] Fail
After that, I get an error in the AsyncSocket.m file (part of library) in this method:
- (void)scheduleDequeueRead
{
if((theFlags & kDequeueReadScheduled) == 0)
{
theFlags |= kDequeueReadScheduled;
[self performSelector:#selector(maybeDequeueRead) withObject:nil afterDelay:0 inModes:theRunLoopModes];
}
}
Specifically, the error is on line:
[self performSelector:#selector(maybeDequeueRead) withObject:nil afterDelay:0 inModes:theRunLoopModes];
And the exception is: Thread 1: BAD_EXC_ACCESS (code 1=0, address=0xd0688b8a)
After that, the app is completely frozen in the simulator. If anybody could offer some insight as to why this is causing the app to freeze, I would really appreciate it.
Here is the library I'm using: CocoaAsyncSocket
EDIT:
After Enabling Zombie Objects and running the app in the simulator, this is spit out in the output:
2012-06-08 14:53:15.416 tekMatrix[3217:f803] *** -[__NSArrayI count]: message sent to deallocated instance 0x6d10a70
I'll have to do a little digging on this and figure out what's happening.
EDIT 2:
After a little digging using instruments, I found out the following:
An Objective-C message was sent to a deallocated object (zombie) at address: 0x6b8bb10.
EDIT 3:
Now the error reads:
Thread 1: EXC_BREAKPOINT(code=EXC_I386_BPT, subcode=0x0)
Here is a screenshot from instruments. I'm not really following how to interpret this, though. It looks like I'm sending a message to an object that has been deallocated. Is this true? If so, how do I go about figuring out where this occurs?
If the image is hard to see, here's a direct link: Instruments Screenshot

Answer 1

You are trying to access a object, that doesnt exsits anymore. Probably you are under-retaining/over-releasing it.
see this answer for a tool to find such objects: How do I set up NSZombieEnabled in Xcode 4?

Answer 2

I know it's way after the fact, but I just had this same exact problem. The solution was adding the ARC flag to AsyncSocket.m, -fobjc-arc
:)