Re: Problem with Cocoa on Java.

FROM : Ilan Volow
DATE : Wed Jul 02 22:19:03 2008

You might want to take a look at doing it in regular Objective-C using 
Apple's QuickTime Kit framework.

http://developer.apple.com/documentation/QuickTime/Conceptual/QTKitProgrammingGuide/Chapter01/chapter_1_section_1.html#/
/apple_ref/doc/uid/TP40001245-CH202-TPXREF101

-- Ilan

On Jul 2, 2008, at 12:27 PM, Antonio Di Ferdinando wrote:

> Hi all,
> I'm quite fresh of this mailing list (and to cocoa), so please 
> accept my apologies if there is something wrong with the subject.
> I have a problem using Cocoa in my Java application.
> In the big picture, I am developing an application that needs to 
> display contents on a continuous basis, in a way similar to those 
> advertisement screens that is possible to find in metro stations, 
> etc. The application contains a (Java) class that takes a path as 
> input parameter and plays the movie found at the location of the 
> path. This action is repeated on average every 40 secs, and paths 
> are obtained dynamically (thus I cannot force the class to play this 
> or that movie).
> Internally, in the Java class i define an applescript script and an 
> NSAppleScript that executes the script. The excerpt of code for the 
> execution of the applescript script is below ('script' is the 
> applescript script I use to start the application and play the movie):
>
> NSAppleScript myScript=new NSAppleScript(script);
> NSMutableDictionary errors=new NSMutableDictionary();
> System.out.println("Starting script execution");
> myScript.execute(errors);
> System.out.println("script executed");
> if(errors.count()>0)
>     System.out.println("errors: "+errors.toString());
>
> In my tests, I am using VLC or QuickTime as players.
> When I use VLC, the applescript script I use is:
> String script = "tell application \"VLC\" \n" +
>                "\t OpenURL \""+path+"\" \n" +
>                "\t play \n" +
>                "\t next \n" +
>                "\t --quit application \"VLC\" \n" +
>                "end tell \n";
>
> When I use QuickTime Player, the script I use is:
> String script="tell application \"QuickTime Player\" \n"+
>                 "\t open file (\" "+path+" \" as POSIX file) \n"+
>                "end tell \n"+
>                "delay 15\n"+
>                "tell application \"QuickTime Player\" \n"+
>                "\t quit \n"+
>                "end tell";
> What apparently happens, and is my problem, is that at a certain 
> point the NSAppleScript does appear to return, and thus the Java 
> class is insensitive to the subsequent calls. In other words, 
> looking at the code snippet above: on a normal execution, the 
> application would print on screen:
>
> Starting script execution
> script executed
>
> while on a 'problematic' execution what I have is only:
>
> Starting script execution
>
> and the application ceases to work.
> I don't know whether this is an issue related to the actual 
> applescript script or the execution of the NSAppleScript itself, and 
> can't work out a way to get rid of this. The OS is 10.5.4, and the 
> Java use is the latest released for Mac but compiled with Java 5 
> standards.
> Does anybody know what's wrong with this? Or, alternatively, other 
> solutions?
>
> Thanks in advance.
>
> Antonio.
> http://san.ee.ic.ac.uk/~diferdin
>
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