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POApplication Freezing when calling CocoaAsyncMethod scheduleDequeueRead
 

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  1. POApplication Freezing when calling CocoaAsyncMethod scheduleDequeueRead
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    <p>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.</p> <p>appDelegate:</p> <pre><code>- (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:&amp;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; } </code></pre> <p>And here are my methods from the CocoaAsyncSocket Library:</p> <pre><code>- (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"); } </code></pre> <p>When I run my app in the simulator, this is what my output log spits out:</p> <pre><code>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 </code></pre> <p>After that, I get an error in the AsyncSocket.m file (part of library) in this method:</p> <pre><code>- (void)scheduleDequeueRead { if((theFlags &amp; kDequeueReadScheduled) == 0) { theFlags |= kDequeueReadScheduled; [self performSelector:@selector(maybeDequeueRead) withObject:nil afterDelay:0 inModes:theRunLoopModes]; } } </code></pre> <p>Specifically, the error is on line:</p> <pre><code>[self performSelector:@selector(maybeDequeueRead) withObject:nil afterDelay:0 inModes:theRunLoopModes]; </code></pre> <p>And the exception is: <strong>Thread 1: BAD_EXC_ACCESS (code 1=0, address=0xd0688b8a)</strong></p> <p>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. </p> <p>Here is the library I'm using: <a href="https://github.com/robbiehanson/CocoaAsyncSocket" rel="nofollow noreferrer">CocoaAsyncSocket</a></p> <p><strong><em>EDIT:</em></strong></p> <p>After Enabling Zombie Objects and running the app in the simulator, this is spit out in the output:</p> <pre><code>2012-06-08 14:53:15.416 tekMatrix[3217:f803] *** -[__NSArrayI count]: message sent to deallocated instance 0x6d10a70 </code></pre> <p>I'll have to do a little digging on this and figure out what's happening.</p> <p><strong><em>EDIT 2:</em></strong></p> <p>After a little digging using instruments, I found out the following: </p> <pre><code>An Objective-C message was sent to a deallocated object (zombie) at address: 0x6b8bb10. </code></pre> <p><strong><em>EDIT 3:</em></strong></p> <p>Now the error reads: </p> <p>Thread 1: EXC_BREAKPOINT(code=EXC_I386_BPT, subcode=0x0)</p> <p>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?</p> <p>If the image is hard to see, here's a direct link: <a href="http://i890.photobucket.com/albums/ac103/mmh924/ScreenShot2012-06-08at31523PM.png" rel="nofollow noreferrer">Instruments Screenshot</a></p> <p><img src="https://i.stack.imgur.com/fGx3p.png" alt="Instruments Screenshot"></p>
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    1. COcan you show the code, where you create the AsyncSocket object? along with the property, if it is written to one.
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    2. COAsyncObject is at the top of the didFinishLaunchingWithOptions method. I inadvertently left out that line of code when I was weeding through commented out lines.
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    3. COI don't know if this helps, but if I remove the line "[socket readDataWithTimeout:10 tag:1];" then the app doesn't freeze or generate an error. It only connects to the host and doesn't read any data.
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