How to post json data to server [duplicate] - iphone

Question

This question already has an answer here:
How to send json post values to a remote server and get the results with iOS 5?
(1 answer)
Closed 9 years ago.
In my iPhone app I want to send my data in JSON format.I have stored all the data in an dictionary.How to change dictionary data in JSON format and then send it to the serve using post method (I need to send to server only).

Answer 1

If your using SBJSON then using the code below you can create JSON string from NSDictionary.
SBJsonWriter *jsonWriter = [SBJsonWriter new];
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjects:values forKeys:keys];
NSString *jsonString = [jsonWriter stringWithObject:dict];

Answer 2

try it
NSMutableDictionary *Dict=[[NSMutableDictionary alloc] initWithObjectsAndKeys:str,#"str",str1,#"str1",Idstr,#"Idstr",nil];
NSError *error=nil;
NSData *Data=[NSJSONSerialization dataWithJSONObject:Dict options:NSJSONWritingPrettyPrinted error:&error];
NSMutableString *JsonString = [[NSMutableString alloc] initWithData:Data encoding:NSUTF8StringEncoding];
NSMutableString *urlstr=#"url"
NSURL *url=[NSURL URLWithString:urlstr];
NSMutableURLRequest *urlrequest=[NSMutableURLRequest requestWithURL:url];
NSString *urlbody=[NSString stringWithFormat:#"inputParam=%#",JsonString];
[urlrequest setHTTPBody:[Alerturlbody dataUsingEncoding:NSUTF8StringEncoding]];
[urlrequest setHTTPMethod:#"POST"];
[urlrequest setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Accept"];
[urlrequest setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[urlrequest setValue:[NSString stringWithFormat:#"%d", [urlbody length]] forHTTPHeaderField:#"Content-Length"];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:urlrequest queue:queue completionHandler:^(NSURLResponse *response, NSData *Resdata, NSError *error)
{
NSError* error;
NSDictionary *jsondict = [NSJSONSerialization
JSONObjectWithData:Resdata //1
options:kNilOptions
error:&error];
//NSLog(#"jsondict:%#",jsondict);
}
else if ([Resdata length] == 0 && error == nil)
{
NSLog(#"Nothing was downloaded.");
else if (error != nil)
{
NSLog(#"Error happened = %#", error);
}
}];