View Full Version : MPMoviePlayerController - error-message

Mar 5, 2009, 06:22 AM
Since <embed sound> in UIWebView html-pages does not seem to work in 2.2 (worked fine in 2.0/2.1, see my post at http://forums.macrumors.com/showthread.php?t=661650), Ive had to find another way to play sounds.

Im trying to use the MPMoviePlayerController instead, and have used the attached code below.

However, I keep getting the following errors:
"Linking /Volumes/.../myApp.app/myApp (2 errors)
(x) ".objc_class_name_MPMoviePlayerController", referenced from:
literal-pointer@_OBJC@_cls_refs@MPMoviePlayerController in myViewController.o
(x)"_MPMoviePlayerPlaybackDidFinishNotification", referenced from:
_MPMoviePlayerPlaybackDidFinishNotification$non_lazy_ptr in myViewController.o
symbol(s) not found
collect2: Id returned 1 exit status"

// in myViewController.h
// --------------------------

#import <MediaPlayer/MediaPlayer.h>

// in myViewController.m
// --------------------------

playMovieAtURL:@"test.wav"; // calls the function playMovieAtURL, and is placed within another function.

MPMoviePlayerController* theMovie=[[MPMoviePlayerController alloc] initWithContentURL:theURL];


theMovie.movieControlMode = MPMovieControlModeHidden;

// Register for the playback finished notification.
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

// Movie playback is asynchronous, so this method returns immediately.
[theMovie play];

// When the movie is done,release the controller.
MPMoviePlayerController* theMovie=[aNotification object];

[[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

// Release the movie instance created in playMovieAtURL
[theMovie release];

Does anybody have a clue to what the mumbo-jumbo in the error-message is about?

Alternatively, can you suggest a better objc-method of playing mp3-sounds (need to be mp3 because of the compression - app becomes way to big with wav/aif)?

Mar 5, 2009, 06:43 AM
you have to add the MediaPlayer.framework to the frameworks of your project

to do this:
right click on frameworks, add existing framework, select the MediaPlayer.framework (which is located in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS2.0.sdk/System/library/Frameworks )