I am trying to create a string from a URL but the URL is null. The string does certainly contain something but the URL is still null.
Here is where I create the URL:
NSData *stringData = feed.urlString;
NSString *stringForURL = [[NSString alloc] initWithData:stringData encoding:NSUTF8StringEncoding];
NSLog(#"Here is the string before being turned into a URL: %#", stringForURL);
NSURL *finalURL = [[NSURL alloc] initWithString:[stringForURL stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];
finalURL = details.finalURL;
NSLog(#"Here is the final URL: %#", finalURL);
Change your final url code to below:-
Nstring *finalURL = [NSURL URLWithString:
[stringForURL
stringByAddingPercentEscapesUsingEncoding:
NSUTF8StringEncoding]];
Related
I am writing an application to authorise itself into Spotify. I used the node app.js example to get things working and an now re-writing natively into Objective C. I have extracted the authorisation code via a callback function
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"https://accounts.spotify.com/api/token"]];
request.HTTPMethod = #"POST";
// put in the header fields
NSString *headerString = [NSString stringWithFormat:#"%#:%#",clientID,clientSecret];
NSData *nsdata = [headerString dataUsingEncoding:NSUTF8StringEncoding];
NSString *base64Encoded = [nsdata base64EncodedStringWithOptions:0];
base64Encoded = [ NSString stringWithFormat:#"Basic %#", base64Encoded];
[request setValue:base64Encoded forHTTPHeaderField:#"Authorization"];
NSLog(#"request.header %#", request.allHTTPHeaderFields.description);
// put in the body form
NSString * stringData = [NSString stringWithFormat:#"grant_type:%#, code:%#, redirect_uri:\"%#\"", #"authorization_code",authorisationCode,redirectUri];
NSData * requestBodyData = [stringData dataUsingEncoding:NSUTF8StringEncoding];
request.HTTPBody = requestBodyData;
NSLog(#"request.body %#", [[NSString alloc] initWithData:request.HTTPBody encoding:NSUTF8StringEncoding]);
I then post this request and get
{"error":"server_error","error_description":"Unexpected status: 415"}
returned.
I have found a variety of questions on this topic revolving around the Content-Type needing to be application/x-www-form-urlencoded but this was no direct cure.
Anyone got any suggestions for me?
I found the answer here NSURLRequest : Post data and read the posted page
It appears that the raw data within the HTTPBody needs to be formatted differently - no JSON at all. The above link has a useful function which I updated slightly
-(NSData*)encodeDictionary:(NSDictionary*)dictionary {
NSMutableArray *parts = [[NSMutableArray alloc] init];
for (NSString *key in dictionary) {
NSString *encodedValue = [[dictionary objectForKey:key] stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLPasswordAllowedCharacterSet]];
NSString *encodedKey = [key stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLPasswordAllowedCharacterSet]];
NSString *part = [NSString stringWithFormat: #"%#=%#", encodedKey, encodedValue];
[parts addObject:part];
}
NSString *encodedDictionary = [parts componentsJoinedByString:#"&"];
return [encodedDictionary dataUsingEncoding:NSUTF8StringEncoding];
}
and ..
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
//NSLog(#"request.header %#", request.allHTTPHeaderFields.description);
// put in the body form using the new function
NSDictionary * parameters = [[NSDictionary alloc] initWithObjectsAndKeys:#"authorization_code",#"grant_type",authorisationCode,#"code",redirectUri,#"redirect_uri", nil ];
NSData * requestBodyData = [self encodeDictionary:parameters];
request.HTTPBody = requestBodyData;
NSString *urlAddress = [NSString stringWithFormat:#"http://www.domain.com?input=%#",[alertView textFieldAtIndex:0].text];
NSURL *myUrl = [NSURL URLWithString:[urlAddress stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *openURL = [NSString stringWithContentsOfURL:myUrl encoding:NSUTF8StringEncoding error:NULL];
NSLog(#"%#",openURL);
openUrl is always returning (null), probably because of the encoding, but I don't know how to fix it.
Double check these three things:
Check that the URL which you are pointing to is a valid URL. The null value could be a result of an invalid URL.
Catch the NSError which the stringWithContentsOfURL throws. That will give you some insight on what is wrong.
Like you suspect, try changing the string encoding.
NSError *error;
NSString *urlString = [NSString stringWithFormat:#"http://www.domain.com?input=%#", stringVariable];
NSURL *urlAdress = [NSURL URLWithString:urlString];
NSString *urlContent = [[NSString alloc] initWithContentsOfURL:urlAdress encoding:NSUTF8StringEncoding error:&error];
NSLog(#"%#", urlContent);
This works fine, the problem was an failing internet connection.
I have a problem with the SBJSON Parser. I'm trying to get some information from a website which gives back a json file. Then I parse that into a string and then into a dictionary (works fine). But when I want the last element (name) from that dict it just gives me an error. Here's my code:
SBJsonParser *parser = [[SBJsonParser alloc] init];
self.videoId = videoId;
// Grab the contents from the url and save it in a string
NSString *content = [NSString stringWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:#"http://gdata.youtube.com/feeds/api/videos/%#?alt=json",videoId]] encoding:NSUTF8StringEncoding error:nil];
// Save the information from the string in a dict
NSDictionary *dict = [parser objectWithString:content error:nil];
NSArray *string = [[dict objectForKey:#"entry"] objectForKey:#"author"];
NSLog(#"%#", string);
Here's the output:
2012-10-10 11:11:47.731 quoteGen[13862:c07] (
{
name = {
"$t" = CommanderKrieger;
};
uri = {
"$t" = "http://gdata.youtube.com/feeds/api/users/CommanderKrieger";
};
}
)
How do I get the name or uri?
NSString *name = [[[string objectAtIndex:0] objectForKey:#"name"] objectForKey:#"$t"];
NSString *urlString = [[[string objectAtIndex:0] objectForKey:#"uri"] objectForKey:#"$t"];
I think it will be helpful to you.
Here Below is my code
NSString *string = [NSString stringWithFormat:#" http://abc.com /Demo/View.php?drinkId=%#&name=%#&comment=%#&date=%#&rating=%#& ReqestType=SubmitComment",DrinkId,Name,Comment,Date,Rating];
NSURL *url = [[NSURL alloc] initWithString:string];
Here in string there is value but url returns nil.
Can Anyone tell why this happened.
Thanks ....
"This won't work, so here's what I did instead"
NSString *string = [NSString stringWithFormat:#"http://abc.com/Demo/View.php?drinkId=%#&name=%#&comment=%#&date=%#&rating=%#&ReqestType=SubmitComment",DrinkId,Name,Comment,Date,Rating];
NSURL *url = [[NSURL alloc] initWithString:string];
NSURL will return nil for URLs that contain illegal chars, like spaces.
Before using your string with [NSURL URLWithString:] make sure to escape all the disallowed chars by using [NSString stringByAddingPercentEscapesUsingEncoding:].
Here is the class reference for NSString.
Hi All Now My Problem Is solved here I did a mistake left a blank space before "http".
The correct code is
NSString *string = [NSString stringWithFormat:#"http://myserver.com/Demo/View.php?drinkId=%#&name=%#&comment=%#&date=%#&rating=%#&ReqestType=SubmitComment",DrinkId,Name,Comment,Date,Rating];
NSURL *url = [[NSURL alloc] initWithString:string];
I want to split the json part from this URL in my iPhone application.
http://vkontakte.ru/login_success.html#session={"expire":"1272008089","mid":"100172","secret":"9c8d8f0305","sid":"1131703552161ae352a1256402e3140d7cbde41b1602a93d15472c82"}
I tried and and saved the JSON into a NSString but what i am getting is
http://vkontakte.ru/api/login_success.html?session=%7B%22mid%22:113158415,%22secret%22:%227ce58bfcd3%22,%22sid%22:%2203831b43c1bb992f9477efbfe96e83f6ecff1c1b661315ac0a20719cf57a44%22,%22expire%22:0%7D
This is not coming in JSOn Format. Below is my code
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = [request URL];
NSError* error;
NSLog (#"json path %#",url);
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSURLRequest *request1 = [NSURLRequest requestWithURL:url];
NSString *json_string = [url absoluteString];
NSArray *arr = [json_string componentsSeparatedByString:#"="];
json_string = [arr objectAtIndex:1];
// parse the JSON response into an object
// Here we're using NSArray since we're parsing an array of JSON status objects
NSArray *statuses = [json_string JSONValue];
NSLog(#"%#",error);
// Each element in statuses is a single status
// represented as a NSDictionary
for (NSDictionary *status in statuses)
{
// You can retrieve individual values using objectForKey on the status NSDictionary
// This will print the tweet and username to the console
NSLog(#"%# - %#", [status objectForKey:#"secret "], [[status objectForKey:#"mid"] objectForKey:#"sid"]);
}
return YES;
}
How can move further?
Try replacing:
NSString *json_string = [url absoluteString];
with
NSString *json_string = [[url absoluteString] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];.
That's a really strange thing you're doing, though. Why does the URL have JSON in it?