objective-c - writeToFile 给出 NSUnderlyingError=0x6a3d450 "The operation couldn’ t 完成。是一个目录”

Question

我正在尝试将文件写入 GCD 中的路径，但它不起作用。不断收到错误“NSUnderlyingError=0x6a3d450”操作无法完成。是一个目录”

dispatch_queue_t downloadQueue = dispatch_queue_create("flickr downloader", NO); 

dispatch_async(downloadQueue, ^{

    NSString* name = [photoDictionary valueForKey:@"title"];
    path = [path stringByAppendingPathComponent:id];

    if(![manager fileExistsAtPath:path]){
        if([manager createDirectoryAtPath: path withIntermediateDirectories:NO attributes:nil error:nil]){ //create intermediate directories
            data = [NSData dataWithContentsOfURL:[FlickrFetcher urlForPhoto:photoDictionary format:FlickrPhotoFormatOriginal]];  
            NSError *error = nil;
            BOOL success = [data writeToFile:path options:NSDataWritingAtomic error:&error];
            if (!success) {
                NSLog(@"Failed to write to file with error: %@", [error description]);
            }

            if([data writeToFile: path atomically:YES]){
                NSLog(@"data written to file");
            }   
        }
    }
    else{
        if([manager fileExistsAtPath:path]){
            data = [manager contentsAtPath:path];
        }
    }


    dispatch_async(dispatch_get_main_queue() , ^{
        sender.navigationItem.rightBarButtonItem = item;
        sender.photoData = data;
        sender.photoName = name; 
        //call the segue
        [sender performSegueWithIdentifier:segueTitle sender:sender];
    });       

});

dispatch_release(downloadQueue);

我遇到的问题是 [data writeToFile: pathatomically:YES] 永远不会执行。但是，数据路径确实已创建，当我“po data”时，程序有点挂起，所以我猜调用 writeToFile 时数据尚未完全获取。但我无法准确指出问题所在，也不知道如何解决。任何建议都将不胜感激。谢谢!

Answer 1

您的代码正在您接下来尝试创建文件的路径中创建一个目录。将其删除或创建父目录