I am using the following code and i am getting a response string in JSON. I don't know how to parse it. What should I do next if I want to call any method on JSON output
// source code
- (void)viewDidLoad
{
[super viewDidLoad];
dataWebService = [[NSMutableData data] retain];
NSMutableURLRequest *request = [[NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"https://www.googleapis.com/customsearch/v1?key=AIzaSyDzl0Ozijg2C47iYfKgBWWkAbZE_wCJ-2U&cx=017576662512468239146:omuauf_lfve&q=lectures&callback=handleResponse"]]retain];
NSURLConnection *myConnection = [NSURLConnection connectionWithRequest:request delegate:self];
[myConnection start];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[dataWebService setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[dataWebService appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *responseString = [[NSString alloc] initWithData:dataWebService encoding:NSUTF8StringEncoding];
NSLog(#"Response: %#",responseString);
[responseString release];
[dataWebService release];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"Error during connection: %#", [error description]);
}
Use a JSON parsing framework: http://code.google.com/p/json-framework/
Related
I am requesting for the response which have alot of data in it.
But again and again my connection get lost.my internet is working properly.But still the connection get lost
The error :-Error Domain=NSURLErrorDomain Code=-1001 "The request timed out."
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
if (theConnection) {
receivedData = [[NSMutableData data] retain];
} else {
NSLog(#"Connection Failed!");
appDel.Internet_connected=FALSE;
[MainHandler performSelector:self.targetSelector_loseconenction];
}
(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[receivedData setLength:0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[receivedData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
//[connection release];
NSLog(#"Connection Failed!");
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
appDel.Internet_connected=TRUE;
NSString *responseString = [[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];
NSString *valueToSave = responseString;
[[NSUserDefaults standardUserDefaults]
setObject:valueToSave forKey:#"responce"];
NSString *savedValue = [[NSUserDefaults standardUserDefaults]
stringForKey:#"responce"];
NSDictionary *result = [savedValue JSONValue];
}
For Better controller with Networking, use this class:
https://github.com/AFNetworking/AFNetworking.
If your connection is bad, you will need to handle this connection failed
with #try #catch #finally
I am downloading Google news as an RSS feed. If I view in a browser, everything works fine. But when I try to download as a readable file using the following code I get a "-1002" error. Any ideas?
- (void)viewDidLoad{
[super viewDidLoad];
path = #"feed://news.google.com/news?pz=1&jfkl=true&cf=all&ned=us&hl=en&q=oslo&cf=all&output=rss";
urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString: path]];
urlConnection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
[urlConnection release];
}
#pragma mark Download RSS
// Start connection and download
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSLog(#"didReceiveResponse");
rssData = [[NSMutableData data] retain];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)dataDownloaded {
NSLog(#"didReceiveData");
[rssData appendData:dataDownloaded];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSString * errorString = [NSString stringWithFormat:#"Error code %i", [error code]];
NSLog(#"error: %#", errorString);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSLog(#"connectionDidFinishLoading");
}
Change feed:// to http:// and it will work.
Using the following code to make my requests, what i've noticed is that data will sometimes not be loaded or fully loaded, this always happens when the app first starts. Any thoughts? I've tried putting in [tableView refresh] in the connectionDidFinishLoading, but that doesn't seem to help, any ideas? Thanks for looking
.h:
NSMutableData *responseData;
.m:
- (void)load {
NSURL *myURL = [NSURL URLWithString:#""];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:myURL
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:60];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
responseData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[responseData release];
[connection release];
[textView setString:#"Unable to fetch data"];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"Succeeded! Received %d bytes of data",[responseData
length]);
NSString *txt = [[[NSString alloc] initWithData:responseData encoding: NSASCIIStringEncoding] autorelease];
}
Are you sure your data did not load? Try [tableView reloadData]; instead of refresh.
i get the follwing error below when i run the program given below
Error:
Error Domain=NSURLErrorDomain Code=-1000 "bad URL" UserInfo=0x5948b80 {NSUnderlyingError=0x5948ac0 "bad URL", NSLocalizedDescription=bad URL}
wat i need to do plz suggest me
thank u..
the code is given below
#implementation WebSampleViewController
- (void)viewDidLoad
{
[super viewDidLoad];
dataWebService = [[NSMutableData data] retain];
NSMutableURLRequest *request = [[NSMutableURLRequest requestWithURL:[NSURL URLWithString:#" http://www.googleapis.com/customsearch"]] retain];
NSURLConnection *myConnection = [NSURLConnection connectionWithRequest:request delegate:self];
[myConnection start];
[super viewDidLoad];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[dataWebService setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[dataWebService appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *responseString = [[NSString alloc] initWithData:dataWebService encoding:NSUTF8StringEncoding];
NSLog(#"Response: %#",responseString);
[responseString release];
[dataWebService release];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"Error during connection: %#", [error description]);
}
You should not retain request instance of type NSMutableURLRequest.
You have an leading white space in your String URL.
Use the below code .
NSMutableURLRequest *request = [[NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"http://www.googleapis.com/customsearch"]];
I think, you should check your URL , I give the same "Not Found" as on iPhone.
Try it without the space at the beginning of your URL string.
You have to remove whitespace in your url
I am connecting to webservices using json.
I connected using nsurl connection. I got json response string ... i need to parse it.
When i try to parse it i am getting following error:
dyld: Symbol not found: _CFXMLNodeGetInfoPtr
here is relevant source code:
// Using NSURLConnection
- (void)viewDidLoad
{
[super viewDidLoad];
dataWebService = [[NSMutableData data] retain];
NSMutableURLRequest *request = [[NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"https://www.googleapis.com/customsearch/v1?key=AIzaSyDzl0Ozijg2C47iYfKgBWWkAbZE_wCJ-2U&cx=017576662512468239146:omuauf_lfve&q=lectures&callback=handleResponse"]]retain];
NSURLConnection *myConnection = [NSURLConnection connectionWithRequest:request delegate:self];
[myConnection start];
[super viewDidLoad];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[dataWebService setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[dataWebService appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *responseString = [[NSString alloc] initWithData:dataWebService encoding:NSUTF8StringEncoding];
NSLog(#"Response: %#",responseString);
[responseString release];
[dataWebService release];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"Error during connection: %#", [error description]);
}
// Parse JSON
- (void)requestCompleted:(ASIHTTPRequest *)request
{
NSString *responseString = [request responseString];
NSDictionary *dictionary = [responseString JSONValue];
NSDictionary *dictionaryReturn = (NSDictionary*) [dictionary objectForKey:#"request"];
NSString *total = (NSString*) [dictionaryReturn objectForKey:#"totalResults"];
NSLog(#"totalResults: %#", total);
int count = [[dictionaryReturn objectForKey:#"count"] intValue];
NSLog(#"count: %d", count);
}
The JSON response string is not a valid one, that's the reason your are getting the error.
Use the following link to check the if the JSON string, sent as response from Web services is valid one or not
JSONLint