无法使用iCloud同步简单文本文件（错误的文件描述符） [英] Cannot sync simple text file with iCloud (bad file descriptor)

问题描述

我在同步一个简单的文本文件时遇到问题，尝试打开时遇到此错误：

I'm having trouble synching a simple textfile, I get this error when trying to open it:

{NSFilePath = / private / var / mobile /移动文档/ 4C224W52W5〜com〜piso13〜opusDomini / currentLogPath，NSUnderlyingError = 0xde9b460操作无法完成。错误的文件描述符}

{NSFilePath=/private/var/mobile/Library/Mobile Documents/4C224W52W5~com~piso13~opusDomini/currentLogPath, NSUnderlyingError=0xde9b460 "The operation couldn’t be completed. Bad file descriptor"}

-(BOOL)createLogFolderFile{        

    NSString *uuid = nil;

    CFUUIDRef uuidRef = CFUUIDCreate(nil);

    uuid = (NSString*)CFUUIDCreateString(nil, uuidRef);

    CFRelease(uuidRef);    



    NSError *error = nil;

    [uuid writeToFile:[self filePath] atomically:NO encoding:NSUTF8StringEncoding error:&error];

    if (error) {

        NSLog(@"Error trying to create log file %@", error);        

        return FALSE;

    }

    else{

        return TRUE;

    }

}

-(NSString*)filePath{

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *iCloudPath = [[fileManager URLForUbiquityContainerIdentifier:nil] path];

    return [iCloudPath stringByAppendingPathComponent:LOG_FOLDER_FILE_NAME];

}

这是我读的方式：

-(NSString*)readLogFolderFromFile{

    NSError *error = nil;

    NSString *logFolder = [NSString stringWithContentsOfFile:[self filePath] encoding:NSUTF8StringEncoding error:&error];

    if (error) {

        NSLog(@"Error when trying to read log folder from file: %@" ,error);

        return nil;

    }

    else{

        return logFolder;

    }

}

使用NSMetadataQuery搜索文件
通知查询完成收集信息结果为正。

I'm using NSMetadataQuery to search for the file, The notification query finish gathering info results positive.

帮助？

推荐答案

文件没有下载。看来NSMetadataQuery通知云中文件的存在。要实际获取文件，需要额外的代码：

The file was not downloaded. It seems NSMetadataQuery notifies about the existence of the file in the cloud. To actually get the file, extra code is needed:

里面的queryDidFinish收集通知：

Inside queryDidFinishGathering notification:

 NSMetadataItem *item = [query resultAtIndex:0];
        self.metadataItem = item;
        BOOL isDownloaded = [[item valueForAttribute:NSMetadataUbiquitousItemIsDownloadedKey]boolValue];

  if (!isDownloaded) {
        NSError *error = nil;
        [[NSFileManager defaultManager] startDownloadingUbiquitousItemAtURL: [item valueForAttribute:NSMetadataItemURLKey] error:&error];
        NSLog(@"Start downloading file");
        if (error) {
            NSLog(@"Error trying to download file: %@", error);
        }
        else{
            [self lookForLogFolderFile];
            return;
        }

    }

lookForLogFolderFile只是重新开始查询。
多次调用后，我的项目被下载。您还可以在每次调用之间使用计时器来启动NSMetadataQuery。在我的情况下，只是一行文本文件。

The lookForLogFolderFile simply starts the query again. After several calls my item gets downloaded. You can also use a timer to between each call to start a NSMetadataQuery. In my case, is just a text file with one line.

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