Plist serialisation in Iphone? - iphone

Question

I have an IPhone application in which i am using this code .
NSPropertyListFormat plistFormat;
NSDictionary *payloadDict = [NSPropertyListSerialization
propertyListWithData:subscriptionProduct.receipt
options:NSPropertyListImmutable
format:&plistFormat
error:nil];
where i am getting the subscriptionProduct.receipt correctly and reciept is an nsdata, which is declared inside the subscriptionProduct class.But after the conversion when i am trying to print payloadDict it is terned to be null.can anybody help me

Answer 1

Try getting the error out of the method and displaying it:
NSPropertyListFormat plistFormat;
NSError *parseError;
NSDictionary *payloadDict = [NSPropertyListSerialization
propertyListWithData:subscriptionProduct.receipt
options:NSPropertyListImmutable
format:&plistFormat
error:&parseError];
NSLog(#"payloadDict = %#", payloadDict);
NSLog(#"parseError = %#", parseError);
If parseError is nil, the property list serialization thinks it read the data properly. If not, its contents should tell you where to look.

Answer 2

Your comments seem to say that you want to construct a new NSDictionary that stores the object subscriptionProduct.receipt.
You can do this:
NSMutableDictionary *payloadDict = [NSMutableDictionary dictionary];
// Always check if values are nil before adding them to a dictionary.
if (subscriptionProduct.receipt)
[payloadDict setObject:subscriptionProduct.receipt forKey:#"receipt"];
If you want to load the receipt later, you can do this:
NSData *receiptData = [payloadDict objectForKey:#"receipt"];