Re: [Q] Handling "cancel" or "stop" button for NSProgressIndicator and on-going task
Re: [Q] Handling "cancel" or "stop" button for NSProgressIndicator and on-going task
- Subject: Re: [Q] Handling "cancel" or "stop" button for NSProgressIndicator and on-going task
- From: Robert Martin <email@hidden>
- Date: Thu, 01 Sep 2011 14:15:02 -0400
No - creating the QT Movie must happen on the main thread - but after it's created, you can pass it off to secondary threads for processing…
Rob
On Sep 1, 2011, at 1:13 PM, JongAm Park wrote:
> Hmmm.. probably.. enterQTKitOnThread allows to create and initialize QTMovie objects on threads?
>
> On Sep 1, 2011, at 9:33 AM, JongAm Park wrote:
>
>> Hello,
>>
>> I wrote codes to processing images on a second thread and the main thread displays and handles "progress dialog box".
>> Because it is not possible to create a "UI thread" according to Cocoa framework, I had the main thread process the progress dialog box, while a second thread process images.
>>
>> However, a problem occurred when I decided to create QuickTime movie files with the processed images on the second thread.
>>
>> It turned out that QuickTime movie can't be created on a second thread, which is not a main thread.
>>
>> An uncaught exception was raised
>> QTMovie_QuickTime class must be initialized on the main thread.
>> *** Terminating app due to uncaught exception 'QTMovieInitializedOnWrongThread', reason: 'QTMovie_QuickTime class must be initialized on the main thread.'
>>
>> Then, is there any code pattern or example to handle progress dialog and time consuming tasks in a main thread without blocking user interaction?
>> Or a solution doesn't need to be confined in that model. If it can utilize a second thread, it is better.
>>
>> Can anyone share his/her idea with me?
>>
>> Thank you.
>> JongAm Park
>
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