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POobjective c cocoa updating gui from a separate thread
 

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  1. POobjective c cocoa updating gui from a separate thread
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    <p>I have a thread which is incrementing the value of the variable "int count" . I want to update my UI with the new value of "int count" until I stop the increment by pressing the stop button. I've manage to update the UI but the memory footprint keep on growing. It doesn't show as a memory leak but it is an allocation problem.the heap size is being increased every time there is a call to a UI element from the thread. I can clearly see instruments leaks allocation part that I have some allocations which are only being freed when moving the Window of touching a UI element. I did not manage to solve the problem despite trying everything. If there is a better way to update UI elements with "int count" new value, feel free to let me know. Thanks</p> <p>I posted the link to the cocoa project below if you want to run with instrument or allocation to see the problem or look at the source. It' a small project just a few lines. </p> <p><a href="http://www.mediafire.com/?tqhm248382bjlc3" rel="nofollow">Xcode Poject GUI UPDATE LINK</a></p> <pre><code>-(void) incrementCountGUI:(id)param{ // increment count and update gui NSAutoreleasePool *pool=[[NSAutoreleasePool alloc]init];// pool just added count++; if (count&gt;=100) {// MAKE SURE COUNT DOESN'T GO ABOVE 100 count=0; } [sliderDisplayOutlet setIntValue:count];// display value of count in textfield [sliderOutlet setIntValue:count];// move slider to value of count [pool release]; } +(void) updateSliderThread:(id)param{// this thread will call incrementCountGUI method to continuously upgrade UI in the background NSAutoreleasePool *myThreadPool=[[NSAutoreleasePool alloc]init]; while (shoudStop==NO) { [ sharedAppInstance performSelectorOnMainThread:@selector(incrementCountGUI:) // update ui in main thread withObject:nil waitUntilDone:NO]; usleep(5000);// sleep microsec; } [myThreadPool release]; } - (IBAction)stopCountAction:(id)sender {// START OR STOP counter thread if ([stopCountButtonOutlet state]==1) { // button depressed=&gt;START shoudStop=NO; [NSThread detachNewThreadSelector:@selector(updateSliderThread:) toTarget:[AppController class] withObject:nil]; [stopCountButtonOutlet setTitle: @" STOP" ]; } if ([stopCountButtonOutlet state]==0){//button depressed=&gt; STOP thread shoudStop=YES; [stopCountButtonOutlet setTitle:@" START INCREMENTING COUNT FROM THREAD "]; } } - (IBAction)sliderAction:(id)sender { // you can change the value of the variable count manualy. count=[sliderOutlet intValue]; [sliderDisplayOutlet setIntValue:count];// display value of count } </code></pre>
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    1. USboubacar mamadou
    1. USboubacar mamadou
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    1. COWhy create an auto release pool if you're not going to drain it?
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      1. USbryanmac
    2. CO@bryanmac Standard practice for a new thread. All thread methods should have an autorelease pool. How do you know that performSelectorOnMainThread: doesn't add any autorelease'd objects to the current pool?
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      1. USMike Weller
    3. COI added an autorelease pool to my method "incrementCountGui" but it has not helped. heap size keep on increasing I can even see it on the activity monitor
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      1. USboubacar mamadou
 

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