I want to update my json file in ios app which is offline compiled in the app. When the app is refreshed the file should get updated from the server : localhost:8888/ios/ios_app/Service/data.json
Please help...
Thank you in advance
I use SOAP when i need get value that can be serialized to a string type. But if all what you need is json file, look at NSURLConnection class.
- (void)downloadJSONFromURL {
NSURLRequest *request = ....
NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
// ...
}
NSData *urlData;
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
urlData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[urlData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSError *jsonParsingError = nil;
id object = [NSJSONSerialization JSONObjectWithData:urlData options:0 error:&jsonParsingError];
if (jsonParsingError) {
DLog(#"JSON ERROR: %#", [jsonParsingError localizedDescription]);
} else {
DLog(#"OBJECT: %#", [object class]);
}
}
Related
Is it possible to call web services like JSON parsing from AppDelegate.m class for "POST"?
I want to post data to server using web Service as application starts .
#pragma mark JSON Delegates
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[responseData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
responseData = nil;
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSDictionary *DictData = (NSDictionary*)[responseString JSONValue];
}
here I attach the sample method add this in your AppDelegate.h
#interface AppDelegate : UIResponder <UIApplicationDelegate>
{
NSURLConnection *clearSession;
NSMutableData * responseData;
}
in your AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self clearsession]; // this is your method Name
return YES;
}
-(void)clearsession
{
// call the clear session
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString:#"yourURLName.php"]];
// get the session ID and UserID from Sqlite
NSString *requestString = [NSString stringWithFormat:#"user_id=%#",passyourString,nil];
NSMutableData *requestData =[NSMutableData dataWithBytes:[requestString UTF8String] length: [requestString length]];
[request setHTTPMethod: #"POST"];
[request setHTTPBody: requestData];
clearSession = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[clearSession start];
}
#pragma mark - NSUrlConnectionDelegate Methods
-(void)connection:(NSConnection*)conn didReceiveResponse:(NSURLResponse *)response
{
if (responseData == NULL)
{
responseData = [[NSMutableData alloc] init];
}
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
UIAlertView *customAlert = [[UIAlertView alloc]initWithTitle:#"No NetWork" message:#"Interet Connection is Lost" delegate:self cancelButtonTitle:#"OK" otherButtonTitles: nil];
[customAlert show];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData: responseData options: kNilOptions error:nil];
NSString *str=[jsonDict objectForKey:#"result"];
if ([str isEqualToString:#"success"])
{
// Add your Home Viewcontroller
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle: nil];
UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:#"yourIDentifierName"];
self.window.rootViewController=viewController;
}
else
{
// do ur stuff here
}
}
choice no-2
use this link , this is protocol method
You can. Check out AFNetworking as a good example to parse json data. I don't recommend you put parsing in app delegate. This delegate just handle things that is before root view controller get a chance to run.
Have you specify you follow the delegate protocol? Based on your code we cannot know.
As I'm a newbie in iOS development, please help me to parse the JSON output.
My JSON output:
{"sbi":[{"Emp_Id":1001,"Emp_Name":"James","Designation":"Manager","Skills":["C,C++"]},{"Emp_Id":1002,"Emp_Name":"John","Designation":"Asst.Manager","Skills":["Java,PHP"]},{"Emp_Id":1003,"Emp_Name":"Joe","Designation":"Chief Manager","Skills":["Oracle,HTML"]}]}
When we launch an app, I should get sbi on the first view and if I select that particular row, I should get all the details related to sbi on the next view, i.e. EmpId, EmpName, Designation, Skills, ...
Thanks in advance.
Parse the json to a dictionary object with
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:yourJson options:0 error:nil];
Please refer following link to Json parsing Demo.It will help you to learn Json parsing.
http://www.raywenderlich.com/5492/working-with-json-in-ios-5
-(void)Startconnection:(NSString *)urlString
{
NSLog(#"%#",urlString);
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:"your url string "]];
connetion1=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self] ;
webData = [NSMutableData data];
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[webData setLength: 0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[webData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
// [ShowAlert showMyAlert:#"Network Alert" :#"No Internet connection detected"];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
NSError *myError = nil;
responceDic=nil;
responceDic = [NSJSONSerialization JSONObjectWithData:webData options:NSJSONReadingMutableLeaves error:&myError];
NSLog(#"%#",responceDic );
}
In the .h file declare NSXMLParserDelegate delegate
#interface webservice : NSObject<NSXMLParserDelegate>
{
NSMutableData * webData;
NSString *currentData;
NSURLConnection * connetion1;
}
I am working on a web service app and i have a question. I am calling a specific Url site with the following code:
NSURL *Url = [NSURL URLWithString:[requestStream stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *htmlString = [NSString stringWithContentsOfURL:Url encoding:NSUTF8StringEncoding error:&error];
Then i create an nsstring and print it with the NSLog and i got the following results:
2014-05-14 15:50:58.118 jsonTest[1541:907] Data : Array
(
[url] => http://sheetmusicdb.net:8000/hnInKleinenGruppen
[encoding] => MP3
[callsign] => SheetMusicDB.net - J
[websiteurl] =>
)
My question in how can i parse the URL link and then use it as a value? I tried to put them to an array or a dictionary but i get error back. So if anyone can help me i would appreciate it.
Ok i managed to grab the link with the following code:
if(htmlString) {
//NSLog(#"HTML %#", htmlString);
NSRange r = [htmlString rangeOfString:#"=>"];
if (r.location != NSNotFound) {
NSRange r1 = [htmlString rangeOfString:#"[encoding]"];
if (r1.location != NSNotFound) {
if (r1.location > r.location) {
_streamTitle = [htmlString substringWithRange:NSMakeRange(NSMaxRange(r), r1.location - NSMaxRange(r))];
NSLog(#"Title %#", _streamTitle);
}
}
}
} else {
NSLog(#"Error %#", error);
}
Thank you for your suggestions. My problem now is that i pass the string into an avplayer and i can't hear music.
I think this will be help for you..
// #property (nonatomic,retain) NSMutableData *responseData;
// #synthesize responseData;
NSString *urlString=#"http:your urls";
self.responseData=[NSMutableData data];
NSURLConnection *connection=[[NSURLConnection alloc]initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]] delegate:self];
NSLog(#"connection====%#",connection);
JSON Delegates :
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[self.responseData setLength:0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[self.responseData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
self.responseData=nil;
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSArray *response_Array = [NSJSONSerialization JSONObjectWithData:self.responseData options:kNilOptions error:nil];
// Write code for retrieve data according to your Key.
}
Try This:
NSString *urlStr=[NSString stringWithFormat:#"uRL"];
NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlStr] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
if (theConnection)
{
receivedData=[[NSMutableData data] retain] ;
}
#pragma mark - Connection Delegate
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
// append the new data to the receivedData
// receivedData is declared as a method instance elsewhere
//NSLog(#"data %#",data);
[receivedData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
// release the connection, and the data object
// [connection release];
// [receivedData release];
UIAlertView *prompt = [[UIAlertView alloc] initWithTitle:#"Connection Failed" message:[error localizedDescription]delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[prompt show];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *content = [[NSString alloc] initWithBytes:[receivedData bytes]
length:[receivedData length] encoding: NSUTF8StringEncoding];
NSData *jsonData = [content dataUsingEncoding:NSUTF32BigEndianStringEncoding];
NSDictionary *jsonDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
}
}
Please do the following to reproduce the problem
NSString *url = #"http://qdreams.com/laura/index.php?request=EventWeekListings&year=2012&month=10&day=22";
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
NSString *json = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"%#" , json);
NSDictionary *deserializedData = [json objectFromJSONString];
deserializedData would contain nil. Expected behavior is to return proper dictionary.
Is that because total number of JSON dictionary elements exceed a certain threshold?
I would appreciate any help in this matter.
Why not just use the NSJSONSerialization method JSONObjectWithData:options:error: it worked fine for me.
NSString *url = #"http://qdreams.com/laura/index.php?request=EventWeekListings&year=2012&month=10&day=22";
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
NSArray *arr = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSLog(#"%#",arr);
After Edit: I ran the code again this morning, and like you I got null. The problem with dataWithContentsOfURL. is that you have no control and no way to know what happened if something went wrong. So, I retested with the code below:
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
[self loadData];
}
-(void) loadData {
NSLog(#"loadData...");
self.receivedData = [[NSMutableData alloc] init];
NSURL *url = [NSURL URLWithString:#"http://qdreams.com/laura/index.php?request=EventWeekListings&year=2012&month=10&day=22"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL: url cachePolicy: NSURLRequestUseProtocolCachePolicy timeoutInterval: 10.0];
[NSURLConnection connectionWithRequest:request delegate:self];
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSLog(#"didReceiveResponse...");
[self.receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
NSLog(#"didReceiveData...");
NSLog(#"Succeeded! Received %ld bytes of data",[data length]);
[self.receivedData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(#"didFailWithError...");
NSLog(#"Connection failed! Error - %# %#",[error localizedDescription],[[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
//lblError.text = [NSString stringWithFormat:#"Connection failed! Error - %#",[error localizedDescription]];
self.receivedData = nil;
}
-(void) connectionDidFinishLoading:(NSURLConnection *)connection {
NSLog(#"connectionDidFinishLoading...");
NSError *error = nil;
id result = [NSJSONSerialization JSONObjectWithData:self.receivedData options:kNilOptions error:&error];
if (error) {
NSLog(#"%#",error.localizedDescription);
NSLog(#"%#",[[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding]);
}else{
NSLog(#"Finished...Download/Parsing successful");
if ([result isKindOfClass:[NSArray class]])
NSLog(#"%#",result);
}
}
There was an error, and the log of error.localizesDescription was: "The data couldn’t be read because it has been corrupted". So, it appears that there is something wrong with what's coming back from the server which prevents the JSON parser from working correctly. I also printed out the string along with the error message. Maybe you can look at it carefully and try to figure out what's wrong with the data.
looking at your json you start with the array value (using square brackets) without a name. try reformatting you response with something like this:
{"results":[...the rest of your response..]}
I want to display a UIProgressView indicating the amount of data received as I request JSON data using touchJSON. I was wondering if there was a way to listen to the size of the data being received.
I request data using the following:
- (NSDictionary *)requestData
{
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:apiURL]];
NSError *error = nil;
NSDictionary *result = [[CJSONDeserializer deserializer] deserializeAsDictionary:data error:&error];
if(error != NULL)
NSLog(#"Error: %#", error);
return result;
}
You will have to introduce some more code to include a download status indicator bar. At the moment you download the data with [NSData dataWithConentsOfURL:...]. Instead, you will make a class that uses a NSURLConnection object to download data, accumulate that data in an MSMutableData object, and update your UI accordingly. You should be able to use the ContentLength HTTP header and the - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; updates to determine the status of the download.
Here are some relevant methods:
- (void) startDownload
{
downloadedData = [[NSMutableData alloc] init];
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}
- (void)connection:(NSURLConnection *)c didReceiveResponse:(NSURLResponse *)response
{
totalBytes = [response expectedContentLength];
}
// assume you have an NSMutableData instance variable named downloadedData
- (void)connection:(NSURLConnection *)c didReceiveData:(NSData *)data
{
[downloadedData appendData: data];
float proportionSoFar = (float)[downloadedData length] / (float)totalBytes;
// update UI with proportionSoFar
}
- (void)connection:(NSURLConnection *)c didFailWithError:(NSError *)error
{
[connection release];
connection = nil;
// handle failure
}
- (void)connectionDidFinishLoading:(NSURLConnection *)c
{
[connection release];
connection = nil;
// handle data upon success
}
Personally, I think the simplest way to do this is to create a class that implements the above methods to do generic data downloads and interface with that class.
This should be enough to get you what you need.