Listing All Folder content from Google Drive - iphone

Question

Hi I have integrated google Dive with my app using Dr. Edit sample code from google drive. But i am not able to view all the files, which are stored in my Google Drive account.
// I have tried this
-(void)getFileListFromSpecifiedParentFolder
{
GTLQueryDrive *query2 = [GTLQueryDrive queryForChildrenListWithFolderId:#"root"];
query2.maxResults = 1000;
[self.driveService executeQuery:query2
completionHandler:^(GTLServiceTicket *ticket,
GTLDriveChildList *children, NSError *error)
{
NSLog(#"\nGoogle Drive: file count in the folder: %d", children.items.count);
if (!children.items.count)
{
return ;
}
if (error == nil)
{
for (GTLDriveChildReference *child in children)
{
GTLQuery *query = [GTLQueryDrive queryForFilesGetWithFileId:child.identifier];
[self.driveService executeQuery:query completionHandler:^(GTLServiceTicket *ticket,
GTLDriveFile *file,
NSError *error)
{
NSLog(#"\nfile name = %#", file.originalFilename);}];
}
}
}];
}
//I want to Display All content in NSLog...

Answer 1

1. How to get all files from Google Drive.
First in viewDidLoad: method check for authentication
-(void)viewDidLoad
{
[self checkForAuthorization];
}
And here is the definition of all methods:
// This method will check the user authentication
// If he is not logged in then it will go in else condition and will present a login viewController
-(void)checkForAuthorization
{
// Check for authorization.
GTMOAuth2Authentication *auth =
[GTMOAuth2ViewControllerTouch authForGoogleFromKeychainForName:kKeychainItemName
clientID:kClientId
clientSecret:kClientSecret];
if ([auth canAuthorize])
{
[self isAuthorizedWithAuthentication:auth];
}
else
{
SEL finishedSelector = #selector(viewController:finishedWithAuth:error:);
GTMOAuth2ViewControllerTouch *authViewController =
[[GTMOAuth2ViewControllerTouch alloc] initWithScope:kGTLAuthScopeDrive
clientID:kClientId
clientSecret:kClientSecret
keychainItemName:kKeychainItemName
delegate:self
finishedSelector:finishedSelector];
[self presentViewController:authViewController animated:YES completion:nil];
}
}
// This method will be call after logged in
- (void)viewController:(GTMOAuth2ViewControllerTouch *)viewController finishedWithAuth: (GTMOAuth2Authentication *)auth error:(NSError *)error
{
[self dismissViewControllerAnimated:YES completion:nil];
if (error == nil)
{
[self isAuthorizedWithAuthentication:auth];
}
}
// If everthing is fine then initialize driveServices with auth
- (void)isAuthorizedWithAuthentication:(GTMOAuth2Authentication *)auth
{
[[self driveService] setAuthorizer:auth];
// and finally here you can load all files
[self loadDriveFiles];
}
- (GTLServiceDrive *)driveService
{
static GTLServiceDrive *service = nil;
if (!service)
{
service = [[GTLServiceDrive alloc] init];
// Have the service object set tickets to fetch consecutive pages
// of the feed so we do not need to manually fetch them.
service.shouldFetchNextPages = YES;
// Have the service object set tickets to retry temporary error conditions
// automatically.
service.retryEnabled = YES;
}
return service;
}
// Method for loading all files from Google Drive
-(void)loadDriveFiles
{
GTLQueryDrive *query = [GTLQueryDrive queryForFilesList];
query.q = [NSString stringWithFormat:#"'%#' IN parents", #"root"];
// root is for root folder replace it with folder identifier in case to fetch any specific folder
[self.driveService executeQuery:query completionHandler:^(GTLServiceTicket *ticket,
GTLDriveFileList *files,
NSError *error) {
if (error == nil)
{
driveFiles = [[NSMutableArray alloc] init];
[driveFiles addObjectsFromArray:files.items];
// Now you have all files of root folder
for (GTLDriveFile *file in driveFiles)
NSLog(#"File is %#", file.title);
}
else
{
NSLog(#"An error occurred: %#", error);
}
}];
}
Note: For get full drive access your scope should be kGTLAuthScopeDrive.
[[GTMOAuth2ViewControllerTouch alloc] initWithScope:kGTLAuthScopeDrive
clientID:kClientId
clientSecret:kClientSecret
keychainItemName:kKeychainItemName
delegate:self
finishedSelector:finishedSelector];
2. How to download a specific file.
So for this you will have to use GTMHTTPFetcher. First get the download URL for that file.
NSString *downloadedString = file.downloadUrl; // file is GTLDriveFile
GTMHTTPFetcher *fetcher = [self.driveService.fetcherService fetcherWithURLString:downloadedString];
[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error)
{
if (error == nil)
{
if(data != nil){
// You have successfully downloaded the file write it with its name
// NSString *name = file.title;
}
}
else
{
NSLog(#"Error - %#", error.description)
}
}];
Note: If you found "downloadedString" null Or empty just have look at file.JSON there are array of "exportsLinks" then you can get the file with one of them.
3. How to upload a file in specific folder: This is an example of uploading image.
-(void)uploadImage:(UIImage *)image
{
// We need data to upload it so convert it into data
// If you are getting your file from any path then use "dataWithContentsOfFile:" method
NSData *data = UIImagePNGRepresentation(image);
// define the mimeType
NSString *mimeType = #"image/png";
// This is just because of unique name you can give it whatever you want
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"dd-MMM-yyyy-hh-mm-ss"];
NSString *fileName = [df stringFromDate:[NSDate date]];
fileName = [fileName stringByAppendingPathExtension:#"png"];
// Initialize newFile like this
GTLDriveFile *newFile = [[GTLDriveFile alloc] init];
newFile.mimeType = mimeType;
newFile.originalFilename = fileName;
newFile.title = fileName;
// Query and UploadParameters
GTLUploadParameters *uploadParameters = [GTLUploadParameters uploadParametersWithData:data MIMEType:mimeType];
GTLQueryDrive *query = [GTLQueryDrive queryForFilesInsertWithObject:newFile uploadParameters:uploadParameters];
// This is for uploading into specific folder, I set it "root" for root folder.
// You can give any "folderIdentifier" to upload in that folder
GTLDriveParentReference *parentReference = [GTLDriveParentReference object];
parentReference.identifier = #"root";
newFile.parents = #[parentReference];
// And at last this is the method to upload the file
[[self driveService] executeQuery:query completionHandler:^(GTLServiceTicket *ticket, id object, NSError *error) {
if (error){
NSLog(#"Error: %#", error.description);
}
else{
NSLog(#"File has been uploaded successfully in root folder.");
}
}];
}