错误域 = NSCocoaErrorDomain 代码 = 257 文件“”无法打开 - Firebase

Posted 2023-03-15

【中文标题】错误域 = NSCocoaErrorDomain 代码 = 257 文件“”无法打开 - Firebase

【英文标题】：Error Domain=NSCocoaErrorDomain Code=257 The fil "" could not be opened - Firebase

【发布时间】：2017-09-03 17:17:53

【问题描述】：

所以我通过自定义 UICollectionView 访问用户的视频和照片，我的问题是当我尝试通过手机将视频上传到 firebase 时，我收到此错误：

2017-09-03 13:09:20.884509-0400 Project[5797:2021536] Cannot get file size: Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_3476.MP4” couldn’t be opened because you don’t have permission to view it." UserInfo=NSURL=file:///var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSFilePath=/var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSUnderlyingError=0x17064f450 Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
  /var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4
2017-09-03 13:09:21.261767-0400 Project[5797:2021536] Body file is unreachable: /var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4
  Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_3476.MP4” couldn’t be opened because you don’t have permission to view it." UserInfo=NSURL=file:///var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSFilePath=/var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSUnderlyingError=0x170651b20 Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"

这里是我加载文件的地方

struct Media 
    var image:UIImage?
    var videoURL:NSURL?


var mediaArray = [Media]()

func grabPhotos()
    let imgManager = PHImageManager.default()

    let requestOptions = PHImageRequestOptions()
    requestOptions.isSynchronous = true
    requestOptions.deliveryMode = .highQualityFormat

    let fetchOptions = PHFetchOptions()
    fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
    if let fetchResult : PHFetchResult = PHAsset.fetchAssets(with: .video, options: fetchOptions) 


        if fetchResult.count > 0 
            for i in 0..<fetchResult.count
                var mediaItem = Media()
                //Used for fetch Image//
                imgManager.requestImage(for: fetchResult.object(at: i) as PHAsset , targetSize: CGSize(width: 400, height: 400), contentMode: .aspectFit, options: requestOptions, resultHandler: 
                    image, error in
                    let imageOfVideo = image! as UIImage
                    mediaItem.image = imageOfVideo;
                    //Used for fetch Video//
                    imgManager.requestAVAsset(forVideo: fetchResult.object(at: i) as PHAsset, options: PHVideoRequestOptions(), resultHandler: (avAsset, audioMix, info) -> Void in
                        if let asset = avAsset as? AVURLAsset 
                            let videoData = NSURL(string: "\(asset.url)")
                            let duration : CMTime = asset.duration
                            let durationInSecond = CMTimeGetSeconds(duration)
                            print(durationInSecond)
                            mediaItem.videoURL = videoData!
                            self.mediaArray.append(mediaItem)
                            print(self.mediaArray.count)


                        

                    )
                )
            

        
        else
            //showAllertToImportImage()//A function to show alert
        
    

我认为这与我上传视频的时间无关，因为我可以录制视频并从手机上传，而不是从手机本身上传；我只是将 url 转移到 nextVC，如下所示：

let videoVC = PrepareVideoVC()
        videoVC.url = outputFileURL as URL!
        self.navigationController?.pushViewController(videoVC, animated: false)

我研究了这个The file “ ” couldn’t be opened because you don’t have permission to view it，但无法真正弄清楚如何实现它

我也遇到了https://***.com/a/41517165/7823620，但我再次尝试实现它，但无法让它不给我错误

我也可以从模拟器上传，但不能从手机上传

它正在尝试从此目录获取文件：

NSFilePath=/var/mobile/Media/DCIM/

【问题讨论】：

你找到解决办法了吗？我面临同样的问题

不幸的是我没有，我目前只是使用原生 UIImagePicker

【参考方案1】：

你可以试试

url.startAccessingSecurityScopedResource()
<...>
url.stopAccessingSecurityScopedResource()

【讨论】：

非常感谢您！一直很想弄清楚这个！奇迹般有效！ :)

只是在上面添加了 Ivan 的评论，因为它为我解决了一个问题。见下文。

【参考方案2】：

使用此选项：

PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHVideoRequestOptionsVersionCurrent;
options.deliveryMode = PHVideoRequestOptionsDeliveryModeHighQualityFormat;
options.networkAccessAllowed = true;

如果你请求中等质量的视频，那么你会得到一个错误“Error Domain=NSCocoaErrorDomain Code=257, no permission...”

【参考方案3】：

因此，如果 AppDelegate 在启动时通过此方法传入文档：

 func application(_: UIApplication, open url: URL, options _: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool 

我发现我必须这样做才能修复它，以便使用上述 Ivan 的解决方案成功加载 FileManager 文档，但如果说文档是电子邮件附件，则无法进行该调用。

这为我解决了这个问题，再次感谢 Ivan Vavilov 的帖子。

func application(_: UIApplication, open url: URL, options _: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool 
    print("Doc attachment passed")
    let docAttachment = url
    
    // files written to 'tmp' are NOT backed up to iCloud or iTunes
    let tempDir = getTempDirectory()
    
    // add file name to tmp path
    tempFileToLoad = tempDir.appendingPathComponent(docAttachment.lastPathComponent)

    let fm = FileManager()
    
    // passed a file from the FileManger app?
    let isAttachmentScopedResource = docAttachment.startAccessingSecurityScopedResource()
    
    do 
        
        // put in tmp so we can read/write
        try fm.copyItem(at: docAttachment, to: tempFileToLoad!)
        
        if(isAttachmentScopedResource) 
            // have MUST release the security access after calling it
            docAttachment.stopAccessingSecurityScopedResource()
        
        
     catch 
        print("Error getting file.  \(error)")
        return false