JSON POST is not working in iOs - ios

Question

I am trying to post some data to the web service using JSON POST method, I have tried so many ways to do this, but none is working. Here is my code, please check:
NSArray *objects=[NSArray arrayWithObjects:#"value1", #"value2",#"value3", #"value4",#"value5", #"value6",#"value7", #"value8",#"value9", nil] ;
NSArray *keys=[NSArray arrayWithObjects:#"FirstName", #"LastName",#"UserName", #"Password",#"Email", #"Gender",#"DeviceId", #"DeviceName",#"ProfileImage", nil];
NSData *_jsonData=nil;
NSString *_jsonString=nil;
NSURL *url=[NSURL URLWithString:urlstring];
NSDictionary *JsonDictionary=[NSDictionary dictionaryWithObjects:objects forKeys:keys];
if([NSJSONSerialization isValidJSONObject:JsonDictionary]){
_jsonData=[NSJSONSerialization dataWithJSONObject:JsonDictionary options:0 error:nil];
_jsonString=[[NSString alloc]initWithData:_jsonData encoding:NSUTF8StringEncoding];
}
NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"POST"];
// [request setHTTPBody:_jsonData];
// [request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
// [request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
// [request setValue:[NSString stringWithFormat:#"%d", [_jsonData length]] forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
NSString *finalString = [_jsonString stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
[request setHTTPBody:[finalString dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES]];
// //return and test
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
Please check.

Answer 1

Here is a sample code am trying to register a user.
In the 'Register' button click,write the following code:
- (IBAction)registerButtonPressed:(id)sender
{
BOOL valid = FALSE;
valid=[self validateEntry];
if(valid)
{
NSString *bytes = [NSString stringWithFormat:#"{\"UserName\":\"%# %#\",\"Email\":\"%#\",\"UserType\":\"normaluser\",\"Password\":\"%#\"}",firstName,lastName,email,password];
NSURL *url=[NSURL URLWithString:urlstring];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:[bytes dataUsingEncoding:NSUTF8StringEncoding]];
[self setUrlConnection:[NSURLConnection connectionWithRequest:request delegate:self]];
[self setResponseData:[NSMutableData data]];
[self.urlConnection start];
}
}
Then add the following as Connection delegate methods:
- (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
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Network Status"
message:#"Sorry,Network is not available. Please try again later."
delegate:self cancelButtonTitle:nil otherButtonTitles:#"OK", nil];
[alert show];
}
- (void) connectionDidFinishLoading:(NSURLConnection *)connection
{
if (connection == self.urlConnection)
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSError *error;
NSDictionary *jsonString=[NSJSONSerialization JSONObjectWithData:self.responseData options:kNilOptions error:&error];
if(jsonString != nil)
{
if ([[[jsonString objectForKey:#"data"] objectForKey:#"id"] length])
{
[[NSUserDefaults standardUserDefaults] setValue:[[jsonString objectForKey:#"data"] objectForKey:#"id"] forKey:#"user_id"];
[[NSUserDefaults standardUserDefaults] setValue:[[jsonString objectForKey:#"data"] objectForKey:#"UserName"] forKey:#"user_name"];
[[NSUserDefaults standardUserDefaults] synchronize];
[delegate userRegistrationViewControllerResponse:self];
}
else
{
UIAlertView *alertView=[[UIAlertView alloc] initWithTitle:#"Info" message:[jsonString objectForKey:#"statusText"] delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alertView show];
}
}
else
{
UIAlertView *alertView=[[UIAlertView alloc] initWithTitle:#"Server Busy" message:#"Register after sometime" delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alertView show];
}
}
}
This will post the user information as JSON.

Answer 2

Try this one....
NSURL *aUrl = [NSURL URLWithString:#"https://www.website.com/_api/Login/"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:aUrl
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:0.0];
[request setHTTPMethod:#"POST"];
NSString *postString = [NSString stringWithFormat:#"EmailAddress=%#&UserPassword=%#",uName.text,pwd.text];
[request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
-Than call the NSURLConnection delegate methods.. dot forgot to alloc the responseData....
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[connection release];
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
responseData = nil;
json =[[responseString JSONValue] retain];
NSLog(#"Dict here: %#", json);
}

Answer 3

The request should be something along these lines...
NSURL * url = [NSURL URLWithString:#"your_url"];
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
NSError * error = nil;
NSData * postData = [NSJSONSerialization dataWithJSONObject:your_json_dictionary_here options:NSJSONReadingMutableContainers error:&error];
[request setHTTPBody:postData];
I also suggest to check your response to find out why is your request failing. Is it on the client side or server side (and why?)...