App crash on creating NSdictionary for Json in IOS - iphone

Question

i am working on in app purchase app in which i want to verify purchase transaction receipt with my developer server along with other information like Device VendorID, software version , device name and product id wish to buy.
I am using NSDictionary to create Json but it crash when i try to add
NSMutableArray *MainOBJ = [NSMutableArray arrayWithObjects:IDdict,deviceData,kMyFeatureIdentifier,jsonObjectString,nil];
in which IDdict is device id string , deviceData is dictionary which content device information like name , software version and kMyFeatureIdentifier is product id NSstring wish to buy. and jsonObjectString is encoded transaction receipt string.
here is my code
- (void)verifyReceipt:(SKPaymentTransaction *)transaction {
//TODO
// currently working on JSON to send to server .
NSLog(#"In verifyReceipt method");
jsonObjectString = [self encode:(uint8_t*)transaction.transactionReceipt.bytes length:transaction.transactionReceipt.length];
// jsonObjectString=#"TESTING";
NSLog(#"Json Object encoded receipt is %#",jsonObjectString);
NSString *IDdict = [[NSString alloc ]initWithString:[UIDevice currentDevice].identifierForVendor.UUIDString]; // Device UDID
NSArray *objects = [NSArray arrayWithObjects:#"NULL",[[UIDevice currentDevice] model],[[UIDevice currentDevice] name],nil];
NSArray *keys = [NSArray arrayWithObjects:#"serial",#"constructor",#"name",nil];
NSDictionary *deviceData = [NSDictionary dictionaryWithObjects:objects forKeys:keys]; // Device information like name , device model , serial number
NSLog(#"Json question dict created");
//TODO: **It crash here**
NSMutableArray *MainOBJ = [NSMutableArray arrayWithObjects:IDdict,deviceData,kMyFeatureIdentifier,jsonObjectString,nil]; // purchased Item ID of previous item
NSMutableArray *MainKeys = [NSMutableArray arrayWithObjects:#"ID",#"device",#"video","#receiptData", nil];
NSMutableDictionary *MainDict = [NSMutableDictionary dictionaryWithObjects:MainOBJ forKeys:MainKeys]; // final string of data
NSLog(#"Json Main dict created");
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:MainDict options:NSJSONWritingPrettyPrinted error:&error];
NSString *resultAsString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(#"Purchase product Json string:\n%#", resultAsString);
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[[NSURL alloc] initWithString:#"http://xyz/dev.php/video/verifyReceipt"]];
[request setPostValue:resultAsString forKey:#"verify"];
[request setDidFinishSelector:#selector(requestDone:)];
[request setTimeOutSeconds:120];
[request setDelegate:self];
[request setNumberOfTimesToRetryOnTimeout:2];
[request setDownloadProgressDelegate:self];
request.showAccurateProgress = YES;
i got "NSLog(#"Json question dict created");" in my log after it crashes.
and my expected json format is like this
{
"ID" : "E6E95901-006B-4569-8D2B-FA29A0307F80",
"device" : {
"name" : "iPad Simulator",
"constructor" : "iPad Simulator",
"serial" : "NULL"
},
"video" : "com.amm.happyclip.4445Video",
"receiptData":"DSKLFKSGERPOKFLJGMZEKLEMSERLKEMZTRKGDGFLefklezkgem"
}
Screenshot of error
Any suggestion , help appreciated Thank you
Encoding method which return string and i just assign that string to "jsonObjectString"
- (NSString *)encode:(const uint8_t *)input length:(NSInteger)length {
static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
NSMutableData *data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
uint8_t *output = (uint8_t *)data.mutableBytes;
for (NSInteger i = 0; i < length; i += 3) {
NSInteger value = 0;
for (NSInteger j = i; j < (i + 3); j++) {
value <<= 8;
if (j < length) {
value |= (0xFF & input[j]);
}
}
NSInteger index = (i / 3) * 4;
output[index + 0] = table[(value >> 18) & 0x3F];
output[index + 1] = table[(value >> 12) & 0x3F];
output[index + 2] = (i + 1) < length ? table[(value >> 6) & 0x3F] : '=';
output[index + 3] = (i + 2) < length ? table[(value >> 0) & 0x3F] : '=';
}
return [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
}

Answer 1

Maybe each object in MainOBJ is nil and if you create dictionary with nil object it crashes your app, or they are already released.
try to log objects from MainOBJ array.