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PODo Cocoa applications have a main loop?
 

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    <p>On Linux under X11 and using GTK+ you have something called "Main Loop". Once you start the main loop you have a timer that runs in the main thread of the application. You can set that timer to a callback function and you have a very nice application-wide timer.</p> <p>This is sample code for that:</p> <pre><code>GMainLoop *loop; if(!loop_running) { display = XOpenDisplay( NULL ); loop = g_main_loop_new(NULL, FALSE); g_timeout_add(1000, (GSourceFunc)callback, NULL); //1 sec laps g_main_loop_run(loop); //to stop use g_main_loop_quit () with the "loop" as arg loop_running=1; } </code></pre> <p>I am trying to write a similar application for Mac OS X and instead of a main loop i am using a simple timer:</p> <pre><code>- (void) handleTimer: (NSTimer *) timer { CopyDataToDB(); } // handleTimer - (IBAction)startStopAction:(id)sender { isOn=!isOn; if(isOn) { // Add our timers to the EventTracking loop [[NSRunLoop currentRunLoop] addTimer: time forMode: NSEventTrackingRunLoopMode]; // Add our timers to the ModelPanel loop [[NSRunLoop currentRunLoop] addTimer: time forMode: NSModalPanelRunLoopMode]; } else { [timer invalidate]; } } </code></pre> <p>That doesn't seem to work very well. The timer is set off all the time. I tried also with an NSTimer but no luck. I'm not very familiar with objective-c and specially with GUI applications.</p> <p>Anyway, any ideas how to implement an application-wide timer on Cocoa (objective-c with Xcode)?</p> <p>Thanks!</p> <p><strong>EDIT</strong> When using NSTimer this is the error I'm getting at runtime:</p> <pre><code>**[Session started at 2009-07-12 16:49:59 -0400.] 2009-07-12 16:50:02.784 MouseClick[1490:10b] Starting 2009-07-12 16:50:02.786 MouseClick[1490:10b] *** +[NSTimer scheduledTimerWithTimeInterval:selector:userInfo:repeats:]: unrecognized selector sent to class 0xa08d54c0 2009-07-12 16:50:02.787 MouseClick[1490:10b] *** +[NSTimer scheduledTimerWithTimeInterval:selector:userInfo:repeats:]: unrecognized selector sent to class 0xa08d54c0** The Debugger has exited with status 0. </code></pre> <p><strong>EDIT 2</strong></p> <p>ok, i got it. The problem was that i didn't add a "target:" to the timer. now, when I'm shutting the timer off I am getting the following error: </p> <pre><code>MouseClick(1652) malloc: * error for object 0x1645c0: double free * set a breakpoint in malloc_error_break to debug </code></pre> <p>The freeing of the timer is done as follow: </p> <pre><code>[timer invalidate]; [timer release]; timer = nil; </code></pre>
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