I'm doing a parsing of a XML and my problem begins when i want to store a NSData of an url needed for my parser. This URL contains the user and the password to authenticate (returns a XML), and in my first UIview it's checked this values. Everything is alright and it's properly authenticated, but once is authenticated if I change the password, the url changes but the corresponding nsdata is stored like before, i.e.:
First time: correct user+correct pass = correct access.
Second time: correct user + incorrect pass = correct access
Also:
First time: correct user + incorrect pass = incorrect access
Second time: correct user + correct pass = incorrect access
It's like the first password was retained and the connection maybe is still alive…so i don't know if I would have to change the default headers of the HTTP...help please!
Here is the code:
-(id) loadXMLByURL: (NSString *)urlString {
NSURL *url = [NSURL URLWithString: urlString]; //The URL changes correctly
NSMutableData *data = [[NSMutableData alloc] initWithContentsOfURL:url]; //Here is the problem
parser = [[NSXMLParser alloc]initWithData:data];
parser.delegate = self;
[parser parse];
return self;
}
Related
I am developing ios application where I am waiting for response which should be uploaded image Url. I am converting NSData to NSString this way.
NSString* resultInString = [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
when I log resultInString, I get __NSCFString * #"\"http:\/\/em.avatars.s3.amazonaws.com\/avatarsd765c404-887c-4c0e-a08b-f7066ec9befe.png\"" 0x17777080
I have no idea how to validate this url to set UIImageview in my application. please give me a hint.
before say something about solution i think your getting url from NSData is incorrect.
The response seems to be JSON-encoded. So simply decode the response string using a JSON library (SBJson, JsonKit etc.)
or you can user correct encode for your NSData.
after all you can create a NSUrl from your string & if it's exist so it's valid.
i write a sample code for you
you should remove some charectar from your url by this way or like this
[urlString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
and for validation
NSUrl * url = [[NSURL alloc] initWithString:urlString];
if(url){ //valid url
}
I'm building a small REST service to authorize users into my app.
At one point, the UIWebView I'm using to authorize the user, will go to https://myautholink.com/login.php. This page sends a JSON response with an authorization token. The thing about this page is that it receives some data via GET via my authorization form. I cannot use PHP sessions because you arrive to this page via:
header("location:https://myautholink.com/login.php?user_id=1&machine_id=machine_id&machine_name=machine_name&app_id=app_id");
Since the header function sends in headers, I cannot do a session_start(); at the same time.
I can get the UIWebView's request URL without a problem using the delegate methods:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSURLRequest *request = [webView request];
NSLog(#"%#", [[request URL] relativeString]);
if([[[request URL] absoluteString] isEqualToString:SPAtajosLoginLink])
{
//Store auth token and dismiss auth web view.
}
}
The thing is none of the NSURL methods seem to return the "clean" link without the parameters. I have looked at all the NSURL url-string related methods:
- (NSString *)absoluteString;
- (NSString *)relativeString; // The relative portion of a URL. If baseURL is nil, or if the receiver is itself absolute, this is the same as absoluteString
But absoluteString is always the full URL with the GET parameters and relativeString is always nil.
I'm scratching my head with this and I can't seem to find the solution. Any help will be appreciated.
Rather than mess about with your own string manipulation, hand off to NSURLComponents:
NSURLComponents *components = [NSURLComponents componentsWithURL:url];
components.query = nil; // remove the query
components.fragments = nil; // probably want to strip this too for good measure
url = [components URL];
On iOS 6 and earlier, you can bring in KSURLComponents to achieve the same result.
Example: http://www.google.com:80/a/b/c;params?m=n&o=p#fragment
Use these methods of NSURL:
scheme: http
host: www.google.com
port: 80
path: /a/b/c
relativePath: /a/b/c
parameterString: params
query: m=n&o=p
fragment: fragment
Or, in iOS 7, build a NSURLComponents instance, then use the methods scheme, user, password, host, port, path, query, fragment, to extract part of the URL as strings. Then build the base URL back.
NSString* baseURLString = [NSString stringWithFormat:#"%#://%#/%#", URL.scheme, ...
NSURL *baseURL = [NSURL URLWithString:baseURLString];
To update this answer for iOS 7 onwards:
NSURLComponents *components = [NSURLComponents componentsWithURL: url resolvingAgainstBaseURL: NO];
components.query = nil; // remove the query
components.fragment = nil; // probably want to strip this too for good measure
url = [components URL];
Please note also that there is no 'fragments' property. It's just 'fragment'.
Otherwise, this method is great. Much better than worrying about putting the URL back together properly with string manips.
I am using NSURLCredentialPersistenceForSession within didReceiveAuthenticationChallenge of NSURLConnection delegate method while login.
Now when I logout and use this code for clearing the storage..
NSURLCredentialStorage *credentialStorage = [NSURLCredentialStorage sharedCredentialStorage];
NSDictionary *credentialsDicationary = [credentialStorage allCredentials];
NSLog(#"credentialsDicationary..%#",[credentialsDicationary description]);
for (NSURLProtectionSpace *space in [credentialsDicationary allKeys]) {
NSDictionary *spaceDictionary = [credentialsDicationary objectForKey:space];
NSLog(#"spaceDictionary..%#",[spaceDictionary description]);
for (id userName in [spaceDictionary allKeys]) {
NSURLCredential *credential = [spaceDictionary objectForKey:userName];
[credentialStorage removeCredential:credential forProtectionSpace:space];
}
}
But when I suddenly login again exactly after logout the login happens with wrong credentials. Please let mw know how to clear the cache. It works if I relogin after some 5 secs of time.
Thanks in advance..
AJ
If you're using NSURLSession, invalidate the session and create a new one, e.g.:
[self.session invalidateAndCancel];
self.session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:nil];
This will clear session-scoped credentials.
If you use NSURLCredentialPersistenceForSession to create the credential then the app stores the credential for the entire session until the app is closed.
You can work around this by either:
changing the url (like appending '#' to the end of the url)
Use NSURLCredentialPersistenceNone and provide the credentials with each nsurlrequest
Append auth info to the url (http://username:password#mywebsite.com), instead of using creds
Append auth info to the request header, instead of using creds
//Pseudo code for appending to header:
NSString *authString = [NSString stringWithFormat:#"%#:%#", self.loginCreds.username, self.loginCreds.password];
NSData *stringData = [authString dataUsingEncoding:NSUTF8StringEncoding];
authString = [NSString stringWithFormat:#"Basic %#", [stringData base64EncodedString]];
[[self requestHeader] setValue:authString forHTTPHeaderField:#"Authorization"];
It's possible to remove the credential but it can take minutes before it is actually removed. However, I don't remember how its done.. It's either done the way you mentioned in the question or through the keychain.
I had the same issue and I tried clear the credential storage, cookies associated with url and even trying to reset the session but nothing seemed to work, finally I just resorted to adding a a random query string value to the end of the url and that did the trick for me
// Random number calculated.
NSInteger randomNumber = arc4random() % 16;
NSURL* apiURL = [NSURL URLWithString:#"https://localhost/api/"];
[[RKObjectManager sharedManager] getObjectsAtPath:[NSString stringWithFormat:#"%#getUser?randomNumber=%d",apiURL,randomNumber]
parameters:nil
success:successBlock
failure:failureBlock];
So instead of trying to remove current cached credentials (which seemed impossible) just use a "fresh" url so there aren't any cached objects associated with it.
I was facing the same problem, now it works.
Using NSURLConnection this issue can be fixed easily by adding a random number to the end of the URL:
So, search for your URLRequest and append the random number to URLRequest
NSInteger randomNumber = arc4random() % 999;
NSString *requestURL = [NSString stringWithFormat:#"%#?cache=%ld",yourURL,(long)randomNumber];
NSURL *URLRequest = [NSURL URLWithString:requestURL];
And make sure you have a random number at the end of all URLs you are calling.
I have an mp3 file on a server. I want to get this file's information like what's the size of this file, what's the artists name, what's the album name, when was the file created, when was it modified, etc. I want all this information.
Is it possible to get this information without actually downloading the whole file? Using NSURLConnection or otherwise?
EDIT:
The following code doesn't give me the required information, i.e. file created by, artist name, etc
NSError *rerror = nil;
NSURLResponse *response = nil;
NSURL *url = [NSURL URLWithString:#"http://link.to.mp3"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"HEAD"];
NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&rerror];
NSString *resultString = [[[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding] autorelease];
NSLog(#"URL: %#", url);
NSLog(#"Request: %#", request);
NSLog(#"Result (NSData): %#", result);
NSLog(#"Result (NSString): %#", resultString);
NSLog(#"Response: %#", response);
NSLog(#"Error: %#", rerror);
if ([response isMemberOfClass:[NSHTTPURLResponse class]]) {
NSLog(#"AllHeaderFields: %#", [((NSHTTPURLResponse *)response) allHeaderFields]);
}
The "AllHeaderFields" is:
AllHeaderFields: {
"Cache-Control" = "max-age=0";
Connection = "keep-alive";
"Content-Encoding" = gzip;
"Content-Type" = "text/plain; charset=ascii";
Date = "Fri, 17 Feb 2012 12:44:59 GMT";
Etag = 19202n;
Pragma = public;
Server = dbws;
"x-robots-tag" = "noindex,nofollow";
}
It is quite possible to get the ID3 information embedded in an MP3 file (artist name, track title) without downloading the whole file or using low-level APIs. The functionality is part of the AVFoundation framework.
The class to look at is AVAsset and specifically it's network friendly subclass AVURLAsset. AVAsset has an NSArray property named commonMetadata. This commonMetadata property will contain instances of AVMetadataItem, assuming of course that the reference URL contains metadata. You will usually use the AVMetadataItem's commonKey property to reference the item. I find this method of iterating through an array checking commonKeys irritating so I create an NSDictionary using the commonKey property as the key and the value property as the object. Like so:
-(NSDictionary *)dictionaryOfMetadataFromAsset:(AVAsset *)asset{
NSMutableDictionary *metaData = [[NSMutableDictionary alloc] init];
for (AVMetadataItem *item in asset.commonMetadata) {
if (item.value && item.commonKey){
[metaData setObject:item.value forKey:item.commonKey];
}
}
return [metaData copy];
}
With the addition of this simple method the AVAsset's metadata becomes quite easy to use. Here is an example of getting an MP3's metadata through a URL:
NSURL *mp3URL = [NSURL URLWithString:#"http://'AddressOfMP3File'"];
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:mp3URL options:nil];
NSDictionary *metaDict = [self dictionaryOfMetadataFromAsset:asset];
NSLog(#"Available Metadata :%#",metaDict.allKeys);
NSLog(#"title:%#",[metaDict objectForKey:#"title"]);
I have found that this code seems to load just the first few seconds of your MP3 file. Also note that this code is synchronous; So use with caution. But AVURLAsset does have some async functionality described in the docs.
Once you have the AVAsset you can create a AVPlayerItem with it and feed that to an AVPlayer and play it, or not.
Yes and no. Things like the file size and modification date often come as part of the HEAD response. But not always: with a lot of dynamic URLs, you won't get all of the information.
As for the artist and album name, they're part of the MP3's ID3, which is contained inside the file, and so you won't be able to get them with a HEAD request. Since the ID3 tag is typically at the beginning of a file, you could try to grab just that part and then read the ID3 tag. But you won't be able to do it with NSURLConnection since it doesn't support just fetching part of a file, so you'll need to find a more low-level way of getting data by HTTP.
Yep, you're right on target with NSURLConnection.
I think you want to send a HEAD request for the resource you want information about and then check the information you receive in connection:didReceiveResponse: and connection:didReceiveData:
Edit
Admittedly I didn't read your question in its entirety. It won't be possible to get ID3 information, but you should be able to get size of file and maybe creation date etc.
This answer does give some good information about how to get the ID3 information. You'd need to set up a php page to examine the mp3 file server-side and return just that information you require instead of the entire mp3.
Is it possible to use the:
[NSMutableArray writeToURL:(NSString *)path atomically:(BOOL)AuxSomething];
In order to send a file (NSMutableArray) XML file to a url, and update the url to contain that file?
for example:
I have an array and I want to upload it to a specific URL and the next time the app launches I want to download that array.
NSMutableArray *arrayToWrite = [[NSMutableArray alloc] initWithObjects:#"One",#"Two",nil];
[arrayToWrite writeToURL:
[NSURL urlWithString:#"mywebsite.atwebpages.com/myArray.plist"] atomically:YES];
And at runtime:
NSMutableArray *arrayToRead =
[[NSMutableArray alloc] initWithContentsOfURL:[NSURL urlWithString:#"mywebsite.atwebpages.com/myArray.plist"]];
Meaning, I want to write an NSMutableArray to a URL, which is on a web hosting service (e.g. batcave.net, the URL receives the information and updates server sided files accordingly.
A highscore like setup, user sends his scores, the server updates it's files, other users download the highscores at runtime.
As for part one of your question,
I'll assume you want to use the contents of a NSMutableArray to form some sort of a URL request (like POST) that you will send to your web service and expect back some information...
There is no prebuilt way of sending the contents of a NSMutableArray to an URL but there are simple ways of doing this yourself. For example, you can loop through the data of your array and make use of NSURLRequest to create a URL request that complies with the interface of your web service. Once you've constructed your request you can send it by passing it a NSURLConnection object.
Consider this very simple and incomplete example of what the client-side code might look like using an Obj-C array to provide data...
NSMutableData *dataReceived; // Assume exists and is initialized
NSURLConnection *myConnection;
- (void)startRequest{
NSLog(#"Start");
NSString *baseURLAddress = #"http://en.wikipedia.org/wiki/";
// This is the array we'll use to help make the URL request
NSArray *names = [NSArray arrayWithObjects: #"Jonny_Appleseed",nil];
NSString *completeURLAsString = [baseURLAddress stringByAppendingString: [names objectAtIndex:0]];
//NSURLRequest needs a NSURL Object
NSURL *completeURL = [NSURL URLWithString: completeURLAsString];
NSURLRequest *myURLRequest = [NSURLRequest requestWithURL: completeURL];
// self is the delegate, this means that this object will hanlde
// call-backs as the data transmission from the web server progresses
myConnection = [[NSURLConnection alloc] initWithRequest:myURLRequest delegate: self startImmediately:YES];
}
// This is called automatically when there is new data from the web server,
// we collect the server response and save it
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSLog(#"Got some");
[dataReceived appendData: data];
}
// This is called automatically when transmission of data is complete
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// You now have whatever the server sent...
}
To tackle part 2 of your question, the receiver of a web request will likely require some scripting or infrastructure to make a useful response.
Here, Answer in this question:
Creating a highscore like system, iPhone side
I couldn't edit my post because I posted from my iPhone as an anonymous user, sorry.