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I am storing some persistent data in /Documents directory which app gets from an API call and is needed to start the app. Apple rejected the app suggesting to skip the iCloud backup.

I used the code described in https://developer.apple.com/library/ios/#qa/qa1719/_index.html

which is 

if (&NSURLIsExcludedFromBackupKey == nil) { // iOS <= 5.0.1
        assert([[NSFileManager defaultManager] fileExistsAtPath: path]);

        const char* filePath = [path fileSystemRepresentation];
        printf("[path fileSystemRepresentation] %s\n",filePath);
        const char* attrName = "com.apple.MobileBackup";
        u_int8_t attrValue = 1;
        int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);
        NSLog(@"errno %d", errno);
        return result == 0;
    } else { // iOS >= 5.1
        NSURL* url = [NSURL fileURLWithPath:path];
        NSError *error = nil;
        BOOL success = [url setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
        NSLog(@"Error excluding %@ from backup %@", [url lastPathComponent], error);
        return success;

    }

It works fine with iOS 5.1 simulator. I checked in filesystem using 

$xattr "filename"

and it shows me 

filename: com.apple.metadata:com_apple_backup_excludeItem

However its not working on 5.0 simulator and also on 5.0.1 3GS device that I tested on.

I stepped thru the code and in the if part (<=5.0.1), I also printed the global var errno as suggested in the Technical Q&A article by apple. However the call to setxattr is failing and errno is printing to be 2 which is ENOENT as per http://developer.apple.com/library/ios/#documentation/system/conceptual/manpages_iphoneos/man2/intro.2.html

I am also printing out the filePath and its not empty and printing out correctly. I checked using iExplorer, the files are on the device as well as in the Simulator folder, they are getting created.

Has anyone faced this? Not sure how to address this?

Any help highly appreciated!

Thanks for you time.

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1 回答 1

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好的......我的坏......它做的一切都是正确的。它应该返回 0 以成功执行 setxattr ......但它仍然返回一个让我绊倒的错误代码......无论如何代码都按预期工作。

于 2012-07-30T07:42:01.070 回答