I'm trying to integrate GData/YouTubeAPI into my project but I'm a bit stuck. I used the code that was given in this post:
Any examples/tutorials on using Google GData API - Youtube on iphone?
My problem is that the function 'request:finishedWithFeed:error:' is not called when the GData service is done grabbing data off the interwebs.
My program compiles and runs – and no runtime errors present themselves. I also checked and feedURL returns a valid URL. I debugged this and 'service' does manage to return a value.
GDataServiceGoogleYouTube *service = [self youTubeService];
// feed id for user uploads
NSString *uploadsID = kGDataYouTubeUserFeedIDUploads;
// construct the feed url
NSURL *feedURL = [GDataServiceGoogleYouTube youTubeURLForUserID:USER_NAME userFeedID:uploadsID];
// make API call
[service fetchFeedWithURL:feedURL delegate:self didFinishSelector:#selector(request:finishedWithFeed:error:)];
This is the header for the function I'm trying to get service to call when its done, it's located in the same object as the other code i've posted
- (void)request:(GDataServiceTicket *)ticket finishedWithFeed:(GDataFeedBase *)aFeed error:(NSError *)error;
SOLUTION --
make sure its running on main thread --
-(id)initWithVideosArrayURLString:(NSString*)url {
if (self = [super init]) {
NSLog(#"loading");
[self performSelectorOnMainThread:#selector(initMainThreadWithURLString:) withObject:url waitUntilDone:NO];
}
return self;
}
-(void)initMainThreadWithURLString:(NSString*)url {
GDataServiceGoogleYouTube *service = [self youTubeService];
NSString *uploadsID = kGDataYouTubeUserFeedIDUploads;
NSURL *feedURL = [GDataServiceGoogleYouTube youTubeURLForUserID:#"annoyingorange" userFeedID:uploadsID];
[service fetchFeedWithURL:feedURL delegate:self didFinishSelector:#selector(serviceTicket:finishedWithFeed:error:)];
NSLog(#"sent");
}
- (void)serviceTicket:(GDataServiceTicket *)ticket finishedWithFeed:(GDataFeedBase *)aFeed error:(NSError *)error {
self.feed = (GDataFeedYouTubeVideo *)aFeed;
NSLog(#"success.");
}
Is your code on the main thread, and returning to the run loop after initiating the fetch? Callbacks occur only when the app's run loop is spinning.
Related
I've been looking around, saw similar posts, but nothing like this that could give me answers. This is my setup and flow of the app:
User has to login via Facebook, using Facebook Graph. LoginView is presented modally, non animated
When user logins I can retrieve FBID and I use this fbid to send it to my web service (REST)
Web service gets the FBID from the NSURL and matches it with database to retrieve other user info
Using JSONserialization i parse the JSON received from web service and display it in the view
PROBLEM: Everything returns NULL except FBID that I get from Facebook. BUT, if I logout from Facebook and then login, that's when it works.
Here is my code:
viewDidAppear method:
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:NO];
if (FBSession.activeSession.isOpen) {
[self populateUserDetails];
}
//Connect to WebService
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"http://atnightcorp.com/api/member/id/%#/format/json", fbid]];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[NSURLConnection connectionWithRequest:request delegate:self];
NSArray *pics = [member valueForKeyPath:#"photos"];
NSString *picCount = [NSString stringWithFormat:#"%d", [pics count]];
[photosCount setTitle:picCount forState:UIControlStateNormal];
NSLog(#"PHOTO: %#", picCount);
NSLog(#"FB: %#", fbid);
}
I tried putting NSURL request and connection code in viewDidLoad, but then I don't get anything back.
My NSURLConnection methods:
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
data = [[NSMutableData alloc]init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData
{
[data appendData:theData];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
member = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
UIAlertView *errorView = [[UIAlertView alloc]initWithTitle:#"Error" message:#"The download could not complete. Please make sure you are connected to internet" delegate:nil cancelButtonTitle:#"Dismiss" otherButtonTitles:nil];
[errorView show];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
The populateUserDetails method that you have seen above:
- (void)populateUserDetails
{
if (FBSession.activeSession.isOpen) {
[[FBRequest requestForMe] startWithCompletionHandler:
^(FBRequestConnection *connection,
NSDictionary<FBGraphUser> *user,
NSError *error) {
if (!error) {
self.userProfileImage.profileID = user.id;
self.navigationItem.title = user.name;
self.fbid = user.id;
}
}];
}
}
This method basically sets the FBID once user is logged in. Other important things you should know that could help you understand my project:
FBID is set as NSString property in my .H file
All facebook connect thing goes on in AppDelegate
I need to dynamically set the NSURL after I find out who the user is.
if I manually input FBID in NSURL, then it works.
everything should be executed when user logins, I think that the timing of retrieving fbid and receiving data from web service is wrong but I can't get to fix it.
IF you need anything else, I will elaborate more and post more code if needed. -
PLEASE HELP as I've been looking for answers for last 3 days.
Your problem is that the populateUserDetails is called and it returns without waiting the code to be executed (because it's an async task with a completition handler, and when you call the NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"http://atnightcorp.com/api/member/id/%#/format/json", fbid]]; for the first time, the fbid is nuil or not set properly (also you should use self.fbid not fbid since fbid is a property).
So you should try to move the whole code that is handling the request from viewDidAppear into a separate method and you should call that method from startWithCompletionHandler after you set the line with self.fbid = user.id
Also call [super viewDidAppear:animated]; not with NO param (this won't solve your problem but this is the right way to do it)
Originally I needed the ability to use the search API with twitter. I did this using Matt Gemmell's great MGTwitterEngine. That code was very very simple and looked something like this:
- (void)viewDidLoad {
[super viewDidLoad];
tweetArrays = nil;
tweetNameArray = nil;
NSString *username = #"<username>";
NSString *password = #"<password>";
NSString *consumerKey = #"<consumerKey>";
NSString *consumerSecret = #"<consumerSecret>";
// Most API calls require a name and password to be set...
if (! username || ! password || !consumerKey || !consumerSecret) {
NSLog(#"You forgot to specify your username/password/key/secret in AppController.m, things might not work!");
NSLog(#"And if things are mysteriously working without the username/password, it's because NSURLConnection is using a session cookie from another connection.");
}
// Create a TwitterEngine and set our login details.
twitterEngine = [[MGTwitterEngine alloc] initWithDelegate:self];
[twitterEngine setUsesSecureConnection:NO];
[twitterEngine setConsumerKey:consumerKey secret:consumerSecret];
// This has been undepreciated for the purposes of dealing with Lists.
// At present the list API calls require you to specify a user that owns the list.
[twitterEngine setUsername:username];
[twitterEngine getSearchResultsForQuery:#"#HelloWorld" sinceID:0 startingAtPage:1 count:100];
}
This would end up calling the function:
- (void)searchResultsReceived:(NSArray *)searchResults forRequest:(NSString *)connectionIdentifier
And then I could do what I wanted with the searchResults. This required me to include the yajl library.
I then wanted to expand my code to allow users to tweet. I downloaded Ben Gottlieb's great code Twitter-OAuth-iPhone
So there's only one problem. The getSearchResultsForQuery returns a requestFailed with the following error:
Error Domain=HTTP Code=400 "The operation couldn’t be completed. (HTTP error 400.)"
To call this code I simply took the demo project in Twitter-OAuth-iPhone and added a call to getSearchResultsForQuery as seen here:
- (void) viewDidAppear: (BOOL)animated {
if (_engine) return;
_engine = [[SA_OAuthTwitterEngine alloc] initOAuthWithDelegate: self];
_engine.consumerKey = kOAuthConsumerKey;
_engine.consumerSecret = kOAuthConsumerSecret;
UIViewController *controller = [SA_OAuthTwitterController controllerToEnterCredentialsWithTwitterEngine: _engine delegate: self];
if (controller)
[self presentModalViewController: controller animated: YES];
else {
[_engine getSearchResultsForQuery:#"HelloWorld"];
// [_engine sendUpdate: [NSString stringWithFormat: #"Already Updated. %#", [NSDate date]]];
}
}
This as stated above returns a 400 error. Every other twitter API call I add here does work such as:
- (NSString *)getRepliesStartingAtPage:(int)pageNum;
Am I doing anything wrong? Or does getSearchResultsForQuery no longer work? The two code bases seem to use different versions of MGTwitterEngine, could that be causing the problem?
Thanks!
The problem is that you have to instantiate the twitter engine as an instance of SA_OAuthTwitterEngine, instead of MGTwitterEngine. When you call getSearchResultsForQuery, it uses a call to _sendRequestWithMethod to actually send the search request. SA_OAuthTwitterEngine overrides the MGTwitterEngine's implementation, but its version of that function doesn't work with getSearchResultsForQuery.
So, you need to go to getSearchResultsForQuery and make it use the MGTwitterEngine's version of the function.
I was hoping someone could help me with this problem. I am trying to access a Picasa Web Album from my iphone application. I have used GData previously with Google Calendar and getting events and the data related to them before, so I set up my methods in a similar fashion. I however am getting an error that is telling me the following
serviceBase:<GDataServiceGooglePhotos: 0x4d4e6d0> objectFetcher:<GDataHTTPFetcher: 0xbaa35c0> failedWithStatus:400 data:Too many results requested
I am think that I have narrowed down the problem that I am having has something to do with the ticket that I am using, in the following line
ticket = [service fetchFeedWithURL:[NSURL URLWithString:kGDataGooglePhotosAllFeed]
delegate:self
didFinishSelector:#selector(photosListTicket:finishedWithFeed:error:)];
I however am unable to get past this problem. Does anyone have a suggestion to get past this problem. Am I doing something wrong?
My full code for the retrieval of the pictures is shown below. Anywhere that says picAlbum, that is a predefined NSArray to hold the information.
- (GDataServiceGooglePhotos *)photoService {
static GDataServiceGooglePhotos* service = nil;
if (!service) {
service = [[GDataServiceGooglePhotos alloc] init];
[service setShouldCacheDatedData:YES];
[service setServiceShouldFollowNextLinks:YES];
}
[service setUserCredentialsWithUsername:#"username"
password:#"password"];
return service;
}
-(void)loadGooglePhotos {
[self fetchAllPhotos];
}
-(void)fetchAllPhotos {
NSLog(#"In fetchAllPhotos");
GDataServiceGooglePhotos *service = [self photoService];
GDataServiceTicket *ticket;
ticket = [service fetchFeedWithURL:[NSURL URLWithString:kGDataGooglePhotosKindAlbum]
delegate:self
didFinishSelector:#selector(photosListTicket:finishedWithFeed:error:)];
}
- (void)photosListTicket:(GDataServiceTicket *)ticket finishedWithFeed:(GDataFeedPhotoAlbum *)feed error:(NSError *)error {
NSLog(#"In photosListTicket");
NSArray *photos = [feed entries];
if ([photos count] != 0){
self.picAlbum = [photos objectAtIndex:0];
NSLog(#"fetching photos");
[self fetchPhotos];
}
else {
NSLog(#"User has no photos...");
}
}
- (void)fetchPhotos {
NSLog(#"In fetchPhotos");
if (self.picAlbum) {
NSURL *feedURL = [[self.picAlbum alternateLink] URL];
if (feedURL) {
NSLog(feedURL);
GDataQueryGooglePhotos *query = [GDataQueryGooglePhotos photoQueryWithFeedURL:feedURL];
[query setMaxResults:1000];
GDataServiceGooglePhotos *service = [self photoService];
GDataServiceTicket *ticket;
ticket = [service fetchFeedWithQuery:query delegate:self didFinishSelector:#selector(photosEventsTicket:finishedWithFeed:error:)];
}
}
}
- (void)photosEventsTicket:(GDataServiceTicket *)ticket finishedWithFeed:(GDataFeedPhotoAlbum *)feed error:(NSError *)error {
NSLog(#"In photosEventsTicket");
NSArray *photos = [feed entries];
NSLog([NSString stringWithFormat:#"%i",[photos count]]);
}
Thanks in advance for any information or help that you can provide.
If the server says "Too many results requested" that's a clue that the max results query parameter is too big.
The fetches in the code snippet do not appear functional. Neither kGDataGooglePhotosKindAlbum nor an album's alternateLink would be URLs for feeds.
I'm writing test cases for a wrapper class written around ASIHTTPRequest. For reasons I can't determine, my test cases complete with failure before the ASIHTTPRequest finishes.
Here's how the program flow works.
Start in my test case.
Init my http engine object, instruct it to create a new list
Create the new ASIHTTPRequest object and set it up.
Add the request to an operation queue.
Wait until that queue is empty
Check to see if my delegate methods were called and fail the test if they weren't.
Now, most of the time everything works fine and the test passes, but some of the time it fails because my delegate methods were called AFTER the operation queue returned control to my wait method.
Test Case
// Set my flags to 'NO'
- (void)setUp {
requestDidFinish = NO;
requestDidFail = NO;
}
- (void)testCreateList {
NSString *testList = #"{\"title\": \"This is a list\"}";
JKEngine *engine = [[JKEngine alloc] initWithDelegate:self];
NSString *requestIdentifier = [engine createList:jsonString];
[self waitUntilEngineDone:engine];
NSString *responseString = responseString_;
[engine release];
GHAssertNotNil(requestIdentifier, nil);
GHAssertTrue(requestDidFinish, nil);
GHAssertTrue([responseString hasPrefix:#"{\"CreateOrEditListResult\""], nil);
}
// Puts the test into a holding pattern until the http request is done
- (void)waitUntilEngineDone:(JKEngine *)engine {
[engine waitUntilFinishedRunning];
}
// The delegate method called on successful completion
- (void)requestFinished:(NSString *)requestIdentifier withResponse:(NSString *)response {
NSLog(#"request did finish");
requestDidFinish = YES;
responseIdentifier_ = [requestIdentifier retain];
responseString_ = [response retain];
}
Engine Code
- (NSString *)createList:(NSString *)list {
ASIHTTPRequest *request = [[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:url]];
[request addRequestHeader:#"Content-Type" value:kContentType];
[request setRequestMethod:kPOST];
request.delegate = self;
[request appendPostData:[list dataUsingEncoding:NSUTF8StringEncoding]];
NSString *requestIdentifier = [NSString stringWithNewUUID];
[operationQueue_ addOperation:request];
[operationDictionary_ setObject:request forKey:requestIdentifier];
return requestIdentifier;
}
// This is the ASIHTTPRequest delegate method that's called on success
// but it sometimes isn't called until AFTER the operationQueue finishes running
- (void)requestFinished:(ASIHTTPRequest *)request {
DLog([request responseString]);
BOOL canNotifiyDelegate = [self.delegate respondsToSelector:#selector(requestFinished:withResponse:)];
if (canNotifiyDelegate) {
NSArray *keyArray = [operationDictionary_ allKeysForObject:request];
NSString *requestIdentifier = [keyArray objectAtIndex:0];
[operationDictionary_ removeObjectForKey:requestIdentifier];
if ([keyArray count] != 1) {
ALog(#"It looks like a request was added to the operation dictionary multiple times. There's a bug somewhere.", nil);
}
[self.delegate requestFinished:requestIdentifier withResponse:[request responseString]];
}
}
- (void)waitUntilFinishedRunning {
[operationQueue_ waitUntilAllOperationsAreFinished];
}
This is the way ASIHTTPRequest works. Delegate methods are called on the main thread, and calls to delegates do not block the request thread, so it's perfectly possible your delegates will be called after the queue finishes.
ASIHTTPRequest calls delegate methods on the main thread, by default GH-Unit runs its tests on a background thread. I'm still a little hazy on exactly what was going on, but forcing my network tests to run on the main thread fixed the problem.
I implemented the following method in my network test class.
- (BOOL)shouldRunOnMainThread {
return YES;
}
Why doesn't this code work? It shows the Google screen but it doesn't change the text box value. I confirmed that the JS does work by running it in Safari, and this code seems to work otherwise since running alert('hi') does work.
NSURL *web_url = [NSURL URLWithString:#"http://www.google.com"];
NSURLRequest *web_request = [NSURLRequest requestWithURL:web_url];
[web_screen loadRequest:web_request];
NSString *js_result = [web_screen stringByEvaluatingJavaScriptFromString:#"document.getElementsByTagName('input')[1].value='test';"];
Just expanding on the previous answer. You need to conform to the UIWebViewDelegate protocol by setting the delegate property of the UIWebView like this:
web_screen.delegate = self;
Then you can implement one of the delegate methods to know when a request has finished loading and is therefore ready to have scripts run like so:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSString *js_result = [webView stringByEvaluatingJavaScriptFromString:#"document.getElementsByTagName('input')[1].value='test';"];
}
For more information on the UIWebViewDelegate protocol visit the Apple site http://developer.apple.com/library/ios/#documentation/uikit/reference/UIWebViewDelegate_Protocol/Reference/Reference.html
The Load URL action takes place asynchronously. It does not even start until your method has ended. So your javascript is being pushed into an empty UIWebView, then your method ends, then the load happens.
You need to let your method end before the js is pushed in. The standard approach for this is to use a Delegate object, which will have a method called on it when the load completes. Only then does it make sense to push in the javascript.
Does it work if you wait for the page to finish loading first?
Consider looking at NSURLConnection and its delegate methods. You can use these to check on the status of a download.
#interface
...
NSURLConnection *connectionInProgress;
NSData *googleRequestResponseData;
NSURL *googleURL;
...
#implementation
...
- (void) setUpRequest {
googleURL = [[NSURL URLWithString:#"http://www.google.com/"] retain];
googleRequestResponseData = [[NSMutableData data] retain];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30.0];
connectionInProgress = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}
#pragma mark NSURLConnection delegate methods
- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[googleRequestResponseData appendData:data];
}
- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
[web_screen loadData:googleRequestResponseData MIMEType:#"application/octet-stream" textEncodingName:#"utf-8" baseURL:googleURL];
NSString *js_result = [web_screen stringByEvaluatingJavaScriptFromString:#"document.getElementsByTagName('input')[1].value='test';"];
NSLog (js_result);
[googleURL release];
[googleRequestResponseData release];
[connectionInProgress release];
connectionInProgress = nil;
}
- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog (#"Connection failed to load data from Google!");
[googleURL release];
[googleRequestResponseData release];
[connectionInProgress release];
connectionInProgress = nil;
}
Alternatively, check out Ben Copsey's ASIHTTPRequest wrapper, which includes a simplified approach to asynchronous downloads (see ASINetworkQueue, specifically).
You can use ASINetworkQueue to run a method of your choice (to run the Javascript code, for example), once the request download is complete.
add '.innerHTML' after what you are searching for
In your case do the following
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSString *js_result = [webView stringByEvaluatingJavaScriptFromString:#"document.getElementsByTagName('input')[1].value='test'.innerHTML"];
}
This worked for me .
check this for more info here