Phasset + AfNetworking上传多个视频

Question

目前我正在使用以下代码上传视频:

  NSURLRequest *urlRequest =  [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [UploadModel getAssetData:entity.asset resultHandler:^(NSData *filedata) {
          NSString *mimeType =[FileHelper mimeTypeForFileAtUrl:entity.fileUrl];
        //  NSError *fileappenderror;

        [formData appendPartWithFileData:filedata name:@"data" fileName: entity.filename mimeType:mimeType];

    }];

} error:&urlRequestError];

GetAssetData方法

+(void)getAssetData: (PHAsset*)mPhasset resultHandler:(void(^)(NSData *imageData))dataResponse{ 

            PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
            options.version = PHVideoRequestOptionsVersionOriginal;

            [[PHImageManager defaultManager] requestAVAssetForVideo:mPhasset options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {

                if ([asset isKindOfClass:[AVURLAsset class]]) {
                    NSURL *localVideoUrl = [(AVURLAsset *)asset URL];
                    NSData *videoData= [NSData dataWithContentsOfURL:localVideoUrl];
                    dataResponse(videoData);

                }
            }];
    }

这种方法的问题是,无论何时上传大/多个视频文件,应用程序都会耗尽内存.我想这是因为请求NSDATA(aka filedata)上传文件(参见上面的方法).我试图使用 它在模拟器上工作的方法appendPartWithFileURLintead 请求文件路径 appendPartWithFileData.并且在具有错误的实际设备上失败,该错误无法通过指定的路径读取文件.我在这里用PHAsset + AFNetworking描述了这个问题 .无法将文件上传到真实设备上的服务器

=======================================

更新:我已修改我的代码,以测试通过新iPhone 6s +上的本地路径上传文件的方法,如下所示

 NSURLRequest *urlRequest =  [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

        NSString *mimeType =[FileHelper mimeTypeForFileAtUrl:entity.fileUrl];
        NSError *fileappenderror;

        [formData appendPartWithFileURL:entity.fileUrl name:@"data" fileName:entity.filename mimeType:mimeType error:&fileappenderror];

        if (fileappenderror) {
            [Sys MyLog:  [NSString stringWithFormat:@"Failed to  append: %@", [fileappenderror localizedDescription] ] ];
        }

    } error:&urlRequestError];

在iPhone 6s +上进行测试可以提供更清晰的日志警告它是调用方法的结果 appendPartWithFileURL

 <Warning>: my_log: Failed to  append file: The operation couldn’t be completed. File URL not reachable.
deny(1) file-read-metadata /private/var/mobile/Media/DCIM/100APPLE/IMG_0008.MOV
 15:41:25 iPhone-6s kernel[0] <Notice>: Sandbox: My_App(396) deny(1) file-read-metadata /private/var/mobile/Media/DCIM/100APPLE/IMG_0008.MOV
 15:41:25 iPhone-6s My_App[396] <Warning>: my_log: Failed to  append file: The file “IMG_0008.MOV” couldn’t be opened because you don’t have permission to view it.

这是用于从PHAsset获取本地文件路径的代码

if (mPhasset.mediaType == PHAssetMediaTypeImage) {

    PHContentEditingInputRequestOptions * options = [[PHContentEditingInputRequestOptions alloc]init];
    options.canHandleAdjustmentData = ^BOOL(PHAdjustmentData *adjustmeta){
        return YES;
    };

    [mPhasset requestContentEditingInputWithOptions:options completionHandler:^(PHContentEditingInput * _Nullable contentEditingInput, NSDictionary * _Nonnull info) {

        dataResponse(contentEditingInput.fullSizeImageURL);

    }];
}else if(mPhasset.mediaType == PHAssetMediaTypeVideo){
    PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
    options.version = PHVideoRequestOptionsVersionOriginal;

    [[PHImageManager defaultManager] requestAVAssetForVideo:mPhasset options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
        if ([asset isKindOfClass:[AVURLAsset class]]) {
            NSURL *localVideoUrl = [(AVURLAsset *)asset URL];
            dataResponse(localVideoUrl);

        }



    }];
}

所以问题仍然是相同的 - 上传到服务器的文件是空的

Answer 1

上面提出的解决方案只是部分正确(并且我之前发现它).由于系统不允许读取沙箱之外的文件,因此文件路径无法访问(读/写)文件,只是复制了文件.在iOS 9及更高版本中,Photos Framework提供了API(它不能通过NSFileManager完成,但只能使用Photos framework api)将文件复制到App的沙箱目录中.这是我在挖掘文档和头文件后使用的代码.

首先将文件复制到app sandbox目录.

// Assuming PHAsset has only one resource file. 
        PHAssetResource * resource = [[PHAssetResource assetResourcesForAsset:myPhasset] firstObject];

    +(void)writeResourceToTmp: (PHAssetResource*)resource pathCallback: (void(^)(NSURL*localUrl))pathCallback {
      // Get Asset Resource. Take first resource object. since it's only the one image.
        NSString *filename = resource.originalFilename;
        NSString *pathToWrite = [NSTemporaryDirectory() stringByAppendingString:filename];
        NSURL *localpath = [NSURL fileURLWithPath:pathToWrite];
        PHAssetResourceRequestOptions *options = [PHAssetResourceRequestOptions new];
        options.networkAccessAllowed = YES;
        [[PHAssetResourceManager defaultManager] writeDataForAssetResource:resource toFile:localpath options:options completionHandler:^(NSError * _Nullable error) {
            if (error) {
                [Sys MyLog: [NSString stringWithFormat:@"Failed to write a resource: %@",[error localizedDescription]]];
            }

            pathCallback(localpath);
        }];

   } // Write Resource into Tmp

上传任务本身

      NSURLRequest *urlRequest =  [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" 
            URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
         // Assuming PHAsset has only one resource file. 

        PHAssetResource * resource = [[PHAssetResource assetResourcesForAsset:myPhasset] firstObject];

        [FileHelper writeResourceToTmp:resource pathCallback:^(NSURL *localUrl)
               {
 [formData appendPartWithFileURL: localUrl name:@"data" fileName:entity.filename mimeType:mimeType error:&fileappenderror];

       }]; // writeResourceToTmp

    }// End Url Request

    AFHTTPRequestOperation * operation = [[AFHTTPRequestOperation alloc ] initWithRequest:urlRequest];
    //.....
    // Further steps are described in the AFNetworking Docs

这种上传方法有一个明显的缺点..如果设备进入"睡眠模式",你会被搞砸..因此这里推荐的上传方法是使用方法.uploadTaskWithRequest:fromFile:progress:completionHandler在AFURLSessionManager.

对于iOS 9以下的版本..在图像的情况下你可以NSDATA从PHAsset我的问题的代码中获取来自..并上传它.或者在上传之前先将它写入您的应用沙箱存储.对于大文件,此方法不可用.或者,您可能希望使用图像/视频选择器导出文件ALAsset.ALAsset提供api,允许您从存储中读取文件.但是您必须在上传之前将其写入沙箱存储.

Answer 2

为每个视频创建NSData可能不好,因为视频(或任何其他文件)可能比设备的RAM大得多,我建议上传为"文件"而不是"数据",如果你附加文件,它将从磁盘块逐块发送数据,并且不会尝试立即读取整个文件,请尝试使用

- (BOOL)appendPartWithFileURL:(NSURL *)fileURL
                     name:(NSString *)name
                    error:(NSError * __autoreleasing *)error

另请参阅https://github.com/AFNetworking/AFNetworking/issues/828

在你的情况下,像这样使用它

  NSURLRequest *urlRequest =  [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[[entity uploadUrl]absoluteString] parameters:entity.params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
  [formData appendPartWithFileURL:entity.fileUrl name:entity.filename error:&fileappenderror];
  if(fileappenderror) {
    NSLog(@"%@",fileappenderror);
  }
} error:&urlRequestError];