Convert to JSON from NSDictionary

convertToJsonFromDictionary

- (void)convertToJsonFromDictionary
{
    NSDictionary *paramDic = @{@"flg": @"true",
                               @"result":[NSNull null]};
    NSData *paramData = nil;
    if([NSJSONSerialization isValidJSONObject:paramDic]){
        paramData = [NSJSONSerialization dataWithJSONObject:paramDic options:NSJSONWritingPrettyPrinted error:nil];
        NSLog(@"%@",paramDic);
        NSLog(@"%@",[[NSString alloc] initWithData:paramData encoding:NSUTF8StringEncoding]);
    }

}