How download file google drive api ios - ios

Question

I tried to download file from google drive API since 3 day without success. I used this https://developers.google.com/drive/ios/devguide/files#reading_files.
But I can't understand what I need to put in *drive and *file?
I tried :
GTLDriveFile *file = #"fileText.txt"; (or I tried the url of my file on google drive...) The guide don't explain... And I didn't find real example.
GTLServiceDrive *drive = ...;
GTLDriveFile *file = ...;
NSString *url = [NSString stringWithFormat:#"https://www.googleapis.com/drive/v3/files/%#?alt=media",
file.identifier]
GTMSessionFetcher *fetcher = [drive.fetcherService fetcherWithURLString:url];
[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
if (error == nil) {
NSLog(#"Retrieved file content");
// Do something with data
} else {
NSLog(#"An error occurred: %#", error);
}
}];
So I had search other code like but no one explain what I need to put in drive and file:
how to download file from google drive using objective c? (just this say it's url)
Google drive api download file for iOS
IOS: How to Download Google Docs files using ios google drive sdk API?
SOLUTION :
I had a problem of authorization with my scope, solved by total access to drive. I changed the scope (in quickstart code, look : "- (GTMOAuth2ViewControllerTouch *)createAuthController...")
-->NSArray *scopes = [NSArray arrayWithObjects:kGTLAuthScopeDrive, nil];
For download (inspired by quickstart example) :
// self.service is my GTLServiceDrive
// When the view appears, ensure that the Drive API service is authorized, and perform API calls.
- (void)viewDidAppear:(BOOL)animated {
if (!self.service.authorizer.canAuthorize) {
// Not yet authorized, request authorization by pushing the login UI onto the UI stack.
[self presentViewController:[self createAuthController] animated:YES completion:nil];
} else {
NSString *urltest = [NSString stringWithFormat:#"https://www.googleapis.com/drive/v3/files/%#?alt=media", identifier_file]; //the ID of my file in a string identifier_file
GTMSessionFetcher *fetcher = [self.service.fetcherService fetcherWithURLString:urltest]; // the request
// receive response and play it in web view:
[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *errorrr) {
if (errorrr == nil) {
NSLog(#"Retrieved file content");
[webView_screen loadData:data MIMEType:#"application/pdf" textEncodingName:#"UTF-8" baseURL:nil]; //my file is a pdf
[webView_screen reload];
} else {
NSLog(#"An error occurred: %#", errorrr);
}
}];
}
}
If you want to save on the phone, you can look the Bala's code.

Answer 1

First fetch the file from Drive
driveFiles = [[NSMutableArray alloc] init];
for (GTLDriveFile *file in files.items) {
if ([file.mimeType isEqualToString:#"application/vnd.google-apps.folder"]) {
} else {
NSString *fileExtension = file.fileExtension;
if (fileExtension) {
if ([fileExtension isEqualToString:#"pdf"]) {
[driveFiles addObject:file];
}
}
}
}
And GTLDriveFile pass the object that you have in the array
GTLDriveFile *file=[driveFiles objectAtIndex:indexPath.row];
This is the code for download the file
NSString *link;
if (file.webContentLink) {
link = file.webContentLink;
} else if (file.embedLink) {
link = file.embedLink;
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"ERROR" message:#"File has no downloadable link" delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
}
if (link) {
NSString *downloadUrl = file.downloadUrl;
GTMHTTPFetcher *fetcher = [self.driveService.fetcherService fetcherWithURLString:downloadUrl];
//async call to download the file data
[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
if (error == nil) {
if (data) {
NSString *dirPath = [self directoryPathForSavingFile];
NSString *filePath = [dirPath stringByAppendingPathComponent:file.title];
[self saveFileJSONData:data forFileName:filePath withCompletionHandler:^(BOOL successStatus) {
// Adding skip attribute to avoid data sinking in iCloud
BOOL path = [[NSFileManager defaultManager] fileExistsAtPath:filePath];
if (path) {
NSLog(#"filePath %#", filePath);
}
}];
}
} else {
NSLog(#"An error occurred: %#", error);
}
}];
}
Code for Directory path for save the file
- (NSString *)directoryPathForSavingFile:(NSString *)directoryName {
NSString *applicationDirectory = [NSHomeDirectory() stringByAppendingPathComponent:#"Documents"];
applicationDirectory = [applicationDirectory stringByAppendingPathComponent:directoryName];
return applicationDirectory;
}