4

在用户允许我们访问他的相机胶卷之后。我们想从我们的应用程序中获取数据并将其上传到我们的服务。有没有办法从文件中访问视频数据？打开视频文件的唯一方法是创建一个 AVAsset。但这对我来说还不够。

我知道关闭

func requestExportSessionForVideo(_ asset: PHAsset!,
                      options options: PHVideoRequestOptions!,
                 exportPreset exportPreset: String!,
                resultHandler resultHandler: ((AVAssetExportSession!,
                    [NSObject : AnyObject]!) -> Void)!) -> PHImageRequestID

但就我而言，我只想将视频上传到我们不想做的服务：

  1. 首先通过导出到我的本地应用程序数据来复制视频
  2. 然后将该数据发送到我们的服务。
  3. 删除数据。

上面的这种方法会占用大量额外的空间和时间，并且对于拥有完整 16GB iPhone 的用户来说效果不佳。

好的，这就是我到目前为止使用 URL 所尝试的

var anAcces = sourceURL?.startAccessingSecurityScopedResource

if !NSFileManager.defaultManager().fileExistsAtPath(sourceURL!.path!) {
    NSLog("not exist")
}

var aFileCoordinator = NSFileCoordinator(filePresenter:nil)
var anError: NSError?

aFileCoordinator.coordinateReadingItemAtURL(sourceURL!, options:.ForUploading, error:&anError, byAccessor:  { (newURL: NSURL!) -> Void in
    var data = NSData(contentsOfURL: newURL)
    })
if let unError = anError {
    NSLog("Error \(unError)")
}

sourceURL?.stopAccessingSecurityScopedResource

这会记录以下内容：

2015-02-08 16:20:01.947 Cameo[15706:2288691] not exist
2015-02-08 16:20:01.991 Cameo[15706:2288691] Error Error Domain=NSCocoaErrorDomain Code=257 "The operation couldn’t be completed. (Cocoa error 257.)" UserInfo=0x170876480 {NSURL=file:///var/mobile/Media/DCIM/100APPLE/IMG_0155.MOV, NSFilePath=/var/mobile/Media/DCIM/100APPLE/IMG_0155.MOV, NSUnderlyingError=0x17005a9a0 "The operation couldn’t be completed. Operation not permitted"}
4

2 回答 2

2

感谢保罗的建议，我想通了：

您必须在该块中创建一个 PHImageManager requestAVAssetForVideo 会话，您可以访问该文件并从 url 读取其数据。

    let imageManager = PHImageManager.defaultManager()
    let videoRequestOptions = PHVideoRequestOptions()

    videoRequestOptions.deliveryMode = .HighQualityFormat
    videoRequestOptions.version = .Current
    videoRequestOptions.networkAccessAllowed = true
    videoRequestOptions.progressHandler = { (progress: Double, error: NSError!, stop: UnsafeMutablePointer<ObjCBool>, [NSObject : AnyObject]!) -> Void in

        NSLog("Progress: %@", progress.description)
    }

    videoRequestOptions.progressHandler = { (progress: Double, error: NSError!, stop: UnsafeMutablePointer<ObjCBool>, [NSObject : AnyObject]!) -> Void in

        NSLog("Progress: %@", progress.description)
    }

    imageManager.requestAVAssetForVideo(nextAsset, options: videoRequestOptions, resultHandler: { (avAsset: AVAsset!, avAudioMix: AVAudioMix!, info: [NSObject : AnyObject]!) -> Void in

        if let nextURLAsset = avAsset as? AVURLAsset {

            let sourceURL = nextURLAsset.URL

            if NSFileManager.defaultManager().fileExistsAtPath(sourceURL.path!) {
                NSLog("exist file")
            }

            var data = NSData(contentsOfURL: sourceURL)

            if let aData = data {
                NSLog("length : <\(aData.length)")
            }
            else {
                NSLog("no data read.")
            }
        }
    }
于 2015-02-09T15:23:17.830 回答
1

关于这个问题：

Failed to issue sandbox extension for file file:///var/mobile/Media/DCIM/100APPLE/IMG_0730.MOV, errno = 1

我对这个问题的解决方法是创建一个临时路径，我能够访问媒体文件：

  Future<void> loadAssets() async {
    List<Asset> resultList = <Asset>[];
    String error = 'No Error Detected';
    final temp = await Directory.systemTemp.create();
    List<File> imagesFileList = [];

    try {
      resultList = await MultiImagePicker.pickImages(
        maxImages: 300,
        enableCamera: true,
        selectedAssets: imagesAssetsList,
        cupertinoOptions: CupertinoOptions(takePhotoIcon: "chat"),
        materialOptions: MaterialOptions(
          actionBarColor: "#abcdef",
          actionBarTitle: "Example App",
          allViewTitle: "All Photos",
          useDetailsView: false,
          selectCircleStrokeColor: "#000000",
        ),
      );
    } on Exception catch (e) {
      error = e.toString();
    }
    if (!mounted) return;

    for (int i = 0; i < resultList.length; i++) {
      final data = await resultList[i].getByteData();
      imagesFileList.add(await File('${temp.path}/img$i').writeAsBytes(
          data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes)));
      print('pathnew: ${imagesFileList[i].path}');
      await uploadFileToStorage(imagesFileList[i].path);
    }

    setState(() {
      imagesAssetsList = resultList;

      _error = error;
    });
  }

我希望它会奏效！

于 2021-05-17T21:26:36.607 回答