How to get NSData from file by using PHAsset

Question

I have file at path

file:///var/mobile/Media/DCIM/100APPLE/IMG_0197.mov

But when I try this code-

NSError *error;
NSData *data = [NSData dataWithContentsOfFile:assetUrl.relativePath options:NSDataReadingMappedAlways error:&error];

I got nothing but error:

Error Domain=NSCocoaErrorDomain Code=257 "Не удалось завершить операцию. (Cocoa, ошибка 257)" UserInfo=0x175a61380 {NSFilePath=/var/mobile/Media/DCIM/100APPLE/IMG_0197.mov, NSUnderlyingError=0x17424e550 "Не удалось завершить операцию. Operation not permitted"}

File exists but I can't read it.

But at the same time AVPlayer normally plays video file.

I tried

PHFetchResult *fetchResult = [PHAsset fetchAssetsWithALAssetURLs:@[assetUrl] options:nil];

But I did not get any result.

Answer 1

You can't access the NSURL directly as the files are outside of the sandbox of your app. Some frameworks (like AVPlayer ) have exception entitlements and can access the URLs. To access the data of PHAsset objects take a look at the following methods of PHImageManager :

For images: requestImageDataForAsset

For videos: requestExportSessionForVideo

Answer 2

For me helped the following code. It's important to use relativePath instead of absoluteString .

    [[PHImageManager defaultManager] requestAVAssetForVideo:videoContent options:options resultHandler:^(AVAsset* avasset, AVAudioMix* audioMix, NSDictionary* info){
                AVURLAsset* myAsset = (AVURLAsset*)avasset;
                NSData * data = [NSData dataWithContentsOfFile:myAsset.URL.relativePath];       
                if (data) {
                }
    }];

Swift 3 version:-

PHImageManager.default().requestAVAsset(forVideo: asset, options: nil, resultHandler: { (asset, mix, nil) in
                    let myAsset = asset as? AVURLAsset
                    do {
                        let videoData = try Data(contentsOf: (myAsset?.url)!)
                        self.selectedVideoData = videoData  //Set video data to nil in case of video
                        print("video data : \(videoData)")

                    } catch  {
                        print("exception catch at block - while uploading video")
                    }
                })