Question

I am using dropbox to upload and download shared files from the dropbox account. this means that every user is able to download the latest version of the file, modify it, and re-upload it, substituting the one before. If there is a stable internet connection, this process works, but if the internet is not responding, the file will be corrupted, and a version of the file that is not complete will be uploaded. This will damage all the users. Is there a way to check if there is a stable internet connection with the dropbox servers? I tried reachability, but it only controls internet connection, not dropbox servers responding.

The code for the error:

- (void)restClient:(DBRestClient*)client uploadFileFailedWithError:(NSError*)error {
NSLog(@"File upload failed with error - %@", error);

UIAlertView *alert1 = [[UIAlertView alloc] initWithTitle:@"Offline mode" message:@"Your event is going to be posted when you create a new event." delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles: nil];
[alert1 show];

 }

The point is that even if this function is called, the file is still uploaded on the internet!

Thanks for any help.

Answer 1

To check if your account is linked with dropbox use this .[[DBSession sharedSession] isLinked] that returns a BOOL value

    if ([[DBSession sharedSession] isLinked]) {         
       // write your code here..
   }

and then to restore your file to previous version ..

For that you just have to understand them clearly

1. you have to load the revisions of the file, that you are going to restore.
   for that you can use either one of these method

Obtains metadata for the previous revisions of a file.
Only revisions up to thirty days old are available.

/* Loads a list of up to 10 DBMetadata objects representing past revisions of the file at path */
- (void)loadRevisionsForFile:(NSString *)path;

/* Same as above but with a configurable limit to number of DBMetadata objects returned, up to 1000 */
- (void)loadRevisionsForFile:(NSString *)path limit:(NSInteger)limit;

for example :
[[self restClient] loadRevisionsForFile:@”YourFile” limit:10];

and these delegate methods from where you can get the array of revisions values for your file

- (void)restClient:(DBRestClient*)client loadedRevisions:(NSArray *)revisions forFile:(NSString *)path;
- (void)restClient:(DBRestClient*)client loadRevisionsFailedWithError:(NSError *)error;

for example:

- (void)restClient:(DBRestClient*)client loadedRevisions:(NSArray *)revisions forFile:(NSString *)path {

    NSArray  *dbRevisionsArray = revisions;
}
- (void)restClient:(DBRestClient*)client loadRevisionsFailedWithError:(NSError *)error{

    [[[UIAlertView alloc] initWithTitle:@"Oops!!!" message:@"Please try again." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
}

So now you have array of metadata of previous revisions of your file.

1. To restore the file [About Restore],

Here there are two cases:

Case 1: is to restore the file in Dropbox
(here you have restored the file only in the Dropbox, to have your restored file in your APP, you have to load the file again to you Database as usual)

Case 2: is to restore the file in your DataBase (*here You can restore your
file only in App’s Database but not in Dropbox, To restore in Dropbox follow Case 1: *)

Case 1: Restore the file in Dropbox

// Restores a file at path as it existed at the given rev and returns the metadata of the restored file after restoration

 - (void)restoreFile:(NSString *)path toRev:(NSString *)rev;

// and their delegate methods

 - (void)restClient:(DBRestClient*)client restoredFile:(DBMetadata *)fileMetadata;
 - (void)restClient:(DBRestClient*)client restoreFileFailedWithError:(NSError *)error;

for example:

       DBMetadata *metaData = [dbRevisionsArray objectAtIndex:row];
      NSString *revStr = metaData.rev;
[[self restClient] restoreFile:@"yourFilePath" toRev:revStr];

then Load the file to your database path..

that’s it ,.

Case 2: Restore file only in App’s Database (Not in Dropbox)

/* This will load a file as it existed at a given rev */

- (void)loadFile:(NSString *)path atRev:(NSString *)rev intoPath:(NSString *)destPath;

- (void)restClient:(DBRestClient*)client loadedFile:(NSString*)destPath contentType:(NSString*)contentType metadata:(DBMetadata*)metadata;
- (void)restClient:(DBRestClient*)client loadFileFailedWithError:(NSError*)error;

for example: [[self restClient] loadFile:@"yourFile" atRev:revStr intoPath:toYourDatabasePath];