Having issues with Unarchiving the data

Question

Created Oct ’20

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Hi

I am getting below error while unarchiving my objective-c custom class.

Error Domain=NSCocoaErrorDomain Code=4864 ""* -[NSKeyedUnarchiver initForReadingFromData:error:throwLegacyExceptions:]: data is empty; did you forget to send -finishEncoding to the NSKeyedArchiver?"" UserInfo={NSDebugDescription=* -[NSKeyedUnarchiver initForReadingFromData:error:throwLegacyExceptions:]: data is empty; did you forget to send -finishEncoding to the NSKeyedArchiver?}"

I am using the method [NSKeyedUnarchiver unarchivedObjectOfClass:[BBUserInfo class] fromData:data error:&error] to un archive the data.

My custom object is confirm to NSSecureCoding and implemented protocol method as below

(BOOL)supportsSecureCoding {

return YES;
}

Also this error doesn't reproduce for me, Its happening in the App Store released version. I am able to figure this error only through the logs.

I'm a bit of a confused especially in regards to NSKeyedArchiver but where am I supposed to send -finishEncoding to the NSKeyedArchiver. Since finishEncoding is a instance method were as I am using class method to unarchive.

Can some one help me on this?

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Answer 1

DTS Engineer OP

Apple

Oct ’20

This error doesn’t indicates an unarchiving problem but an archiving one. The NSData you passed to the unarchiver is empty, that is, it contains 0 bytes. Clearly that’s not valid, so you need to look at the archiving side (or possibly the code that reads the data) to figure out how you got to that point.

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