AFNetworking Data Parameter is nil JSON Data - ios

Question

I have an UITableViewController and I'm trying getting JSON data from url with this code but I'm getting error.What should I do ?
AFSecurityPolicy *securityPolicy = [[AFSecurityPolicy alloc] init];
[securityPolicy setAllowInvalidCertificates:YES];
NSString *urlPath = [NSString stringWithFormat:#"http://testurl.com/api/index.php"];
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters = #{#"process":#"search_customer",#"page": #""};
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:#"text/html"];
[manager setSecurityPolicy:securityPolicy];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
[manager POST:urlPath parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString *string = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSData *jsonData = [NSData dataWithContentsOfFile:string];
NSError *error = nil;
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
self.customerCards = [NSMutableArray array];
NSArray *customersArray = [dataDictionary objectForKey:#"musteri_list"];
for (NSDictionary *customersDictionary in customersArray) {
ApiClass *customer = [ApiClass customersWithTitle:[customersDictionary objectForKey:#"adi"]];
customer.tel = [customersDictionary objectForKey:#"tel"];
[self.customerCards addObject:customer];
}
NSLog(#"GET: %#", string);
NSLog(#"POST: %#", parameters);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
}];
This is the error bloc
2015-03-26 14:27:37.656 SaphiraCrm[13770:3881729] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'data parameter is nil'

Answer 1

I think the problem could be in the fact that you are treating the responseObject as if it was NSData, but according to AFNetworking examples, by default AFHTTPRequestOperationManager's responseSerializer is an AFJSONResponseSerializer, so responseObject is already a parsed JSON represented as an NSDictionary (depends on the serializer).
Therefore, the line
NSString *string = [[NSString alloc] initWithData:responseObject
encoding:NSUTF8StringEncoding];
returns nil, which causes the next line
NSData *jsonData = [NSData dataWithContentsOfFile:string];
to raise the exception.
I would suggest that you check responseObject is what you expect it to be and refactor your code accordingly.
...
[manager POST:urlPath
parameters:parameters
success:^(AFHTTPRequestOperation *operation, id responseObject) {
if (responseObject) {
NSLog(#"Response is a %# and contains: %#", [responseObject class], responseObject);
// Process responseObject according to its type
...
Note:
It is very likely that the above is just the consequence of a previous mistake in the way you set your seriliazer's configuration, since you set first the acceptableContentType first and then overwrite it with the default one.
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:#"text/html"];
...
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
// this is likely to invalidate the previous, since you overwritting
// the manager's serializer with a new one with default configuration.

Answer 2

Okey I figured Out how can I do this.
There is my code
AFSecurityPolicy *securityPolicy = [[AFSecurityPolicy alloc] init];
[securityPolicy setAllowInvalidCertificates:YES];
NSString *urlPath = [NSString stringWithFormat:#"http://test.com/api/index.php"];
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters = #{#"process":#"search_customer",#"page": #""};
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:#"text/html"];
[manager setSecurityPolicy:securityPolicy];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
[manager POST:urlPath parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString *string = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSError *error = nil;
NSData *jsonData = [string dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
self.customerCards = [NSMutableArray array];
NSArray *customersArray = [dataDictionary objectForKey:#"musteri_list"];
NSLog(#"%#",customersArray);
for (NSDictionary *customersDictionary in customersArray) {
ApiClass *customer = [ApiClass customersWithTitle:[customersDictionary objectForKey:#"adi"]];
customer.tel = [customersDictionary objectForKey:#"tel"];
[self.customerCards addObject:customer];
}
[self.tableView reloadData];
NSLog(#"GET: %#", string);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
}];