如何从目录中读取文件答案

【问题标题】：how to read files from directory如何从目录中读取文件
【发布时间】：2013-02-03 21:12:27
【问题描述】：

我有一个别人写的项目。该项目将视频文件保存在此路径，file://localhost/var/mobile/Applications/CAC8F2CB-1C7D-4805-BF1A-42B63B258E95/Documents/output.mp4

我想用 MPMoviePlayerController 播放文件，如何访问文件？

【问题讨论】：

标签： iphone ios nsdocumentdirectory

【解决方案1】：

如果您将上述 URL 存储在某处

NSString *fullURL = @"/var/mobile/Applications/CAC8F2CB-1C7D-4805-BF1A-42B63B258E95/Documents/output.mp4"
NSURL *movieURL = [NSURL fileURLWithPath: isDirectory:YES]; //If YES not works use NO
MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];

希望有帮助

【讨论】：

【解决方案2】：

试试这个：-

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
NSString *documentsDirectory = [paths objectAtIndex:0];  
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:@"output.mp4"];

在fullPath 中，您将拥有上述路径。

有关如何播放视频的更多详细信息，请参阅this tutorial

希望对你有所帮助..

【讨论】：

你为什么用stringWithFormat？
@MidhunMP 实际上我有整数变量来播放许多视频，无论如何编辑答案。谢谢:)

【解决方案3】：

首先加载路径和文件URL：

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,    NSUserDomainMask, YES) objectAtIndex:0];

NSString *localFilePath = [photoDirectoryPath stringByAppendingPathComponent:@"output.mp4"];

然后用 URL 加载 MPMoviePlayerController

- (void)initMoviePlayer 
{
didExit = NO;

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(moviePreloadDidFinish:) 
                                             name:MPMoviePlayerLoadStateDidChangeNotification 
                                           object:mMoviePlayer];

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(moviePlayBackDidFinish:) 
                                             name:MPMoviePlayerPlaybackDidFinishNotification 
                                           object:nil];

NSLog(@"initMoviePlayer: %@ ",[self getMovieURL]);

mMoviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[self getMovieURL]];

mMoviePlayer.shouldAutoplay = YES;

mMoviePlayer.view.hidden = YES;

[mMoviePlayer setControlStyle:MPMovieControlStyleNone];

mMoviePlayer.view.frame = [self.view bounds];

mMoviePlayer.scalingMode = MPMovieScalingModeNone;

[[self view] addSubview:[mMoviePlayer view]];

[mMoviePlayer play];

}

- (void) moviePreloadDidFinish:(NSNotification*)notification {

// start playing the movie

    mMoviePlayer.view.hidden = NO;

    animateTimer = [NSTimer scheduledTimerWithTimeInterval:0.5
                                                target:self 
                                              selector:@selector(playMovie:) 
                                              userInfo:nil 
                                               repeats:NO];
}

- (void) moviePlayBackDidFinish:(NSNotification*)notification 
{        

}

【讨论】：

不工作我得到我得到一个错误errorLog MPMovieFinishReasonPlaybackError

【解决方案4】：

试试这个代码伙伴，

NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) objectAtIndex:0];

NSString *videoFilePath = [documentDirectory stringByAppendingPathComponent:@"output.mp4"];
    NSURL *videoURL = [NSURL URLWithString:videoFilePath];

MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];

【讨论】：