iOS : Message = "An error has occurred." in JSON POST - ios

Question

Working in java, not in objective c. Data is not saved in the database despite getting in "Json Data Posted" condition.
I should send the data in the format as shown below to get the json response
{
"ProjID": "78",
"Uid": "12",
"EmailID": "ratnam_nv#yahoo.com",
"ProjectInviterFQAnswers": [{
"slno": "1",
"Answer": "a1",
"order": "1",
"flag": "F"
}, {
"slno": "2",
"Answer": "a1",
"order": "2",
"flag": "F"
}, {
"slno": "1",
"Answer": "a1",
"order": "2",
"flag": "Q"
}
]
};
I am sending the dictionary I got in log in the format as shown below.
The differnce between the above code and my log's screenshot is ';' after every key value pair and hence I get the response as mentioned in the title.
Any suggestions to correct the code/logic? Here's what I coded.
NSError *error = Nil;
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSDictionary *dictionaryArray1 = [NSDictionary dictionaryWithObjectsAndKeys:#"1", #"slno", #"a1", #"Answer", #"1", #"order", #"F", #"Flag", nil];
NSDictionary *dictionaryArray2 = [NSDictionary dictionaryWithObjectsAndKeys:#"2", #"slno", #"a1", #"Answer", #"1", #"order", #"F", #"Flag", nil];
NSDictionary *dictionaryArray3 = [NSDictionary dictionaryWithObjectsAndKeys:#"1", #"slno", #"a1", #"Answer", #"2", #"order", #"Q", #"Flag", nil];
NSArray *arrayAnswer = [NSArray arrayWithObjects:dictionaryArray1, dictionaryArray2, dictionaryArray3, nil];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:#"78", #"ProjID", #"12", #"UID", #"ratnam_nv#yahoo.com", #"EmailID", arrayAnswer, #"ProjectInviterFQAnswer", nil];
NSLog(#"Dictionary that is being sent to URL is = %#", dictionary);
NSURL *url = [NSURL URLWithString:#"http://cnapi.iconnectgroup.com/api/QRCodeScan/SaveAnswers"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
NSData *requestData = [NSJSONSerialization dataWithJSONObject:dictionary options:kNilOptions error:&error];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:[NSString stringWithFormat:#"%d", [requestData length]] forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody: requestData];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){
if(error || !data)
{
NSLog(#"JSON Data not posted!");
[activity stopAnimating];
UIAlertView *alertMessage = [[UIAlertView alloc] initWithTitle:#"Error" message:#"Data not saved" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alertMessage show];
}
else
{
[activity startAnimating];
NSLog(#"JSON data posted! :)");
NSError *error = Nil;
NSJSONSerialization *jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
NSLog(#"Response is %#", jsonObject);
[activity stopAnimating];
}
}];
}

Answer 1

So here's how I solved my own issue.
NSString *str = #"{\"ProjID\": \"78\",\"Uid\": \"12\",\"EmailID\": \"ratnam_nv#yahoo.com\",";
str = [str stringByAppendingString:#"\"ProjectInviterFQAnswers\": ["];
str = [str stringByAppendingString:#"{\"slno\": \"1\",\"Answer\": \"a1\",\"order\": \"1\", \"flag\": \"F\"},"];
str = [str stringByAppendingString:#"{\"slno\": \"2\",\"Answer\": \"a1\",\"order\": \"1\",\"flag\": \"F\"},"];
str = [str stringByAppendingString:#"{\"slno\": \"1\",\"Answer\": \"a1\",\"order\": \"2\",\"flag\": \"Q\"}"];
str = [str stringByAppendingString:#"]}"];
NSLog(#"String is === %#", str);
NSURL *url = [NSURL URLWithString:#"http://cnapi.iconnectgroup.com/api/QRCodeScan/SaveAnswers/"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
NSData *requestData = [str dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:[NSString stringWithFormat:#"%d", [requestData length]] forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody: requestData];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){
if(error || !data)
{
NSLog(#"JSON Data not posted!");
[activity stopAnimating];
UIAlertView *alertMessage = [[UIAlertView alloc] initWithTitle:#"Error" message:#"Data not saved" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alertMessage show];
}
else
{
[activity startAnimating];
NSLog(#"JSON data posted! :)");
NSError *error = Nil;
NSJSONSerialization *jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
NSLog(#"Response is %#", jsonObject);
}
}];

Answer 2

In my case I got the same error, the issue was that I send the wrong data to the service. Basically, the error was caused by setting the wrong body with the line:
[request setHTTPBody: requestData];
Between, sendSynchronousRequest is deprecated in iOS9. Use
...
NSURLSessionDataTask * dataTask = [[NSURLSession sharedSession] dataTaskWithRequest:request
completionHandler:^(NSData *data,
NSURLResponse *response,
NSError *error) {
if(error || !data)
{
NSLog(#"JSON Data not posted!");
[activity stopAnimating];
UIAlertView *alertMessage = [[UIAlertView alloc] initWithTitle:#"Error" message:#"Data not saved" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alertMessage show];
}
else
{
[activity startAnimating];
NSLog(#"JSON data posted! :)");
NSError *error = Nil;
NSJSONSerialization *jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
NSLog(#"Response is %#", jsonObject);
[activity stopAnimating];
}
}] resume];