How do I convert an struct of type Data to an object of type CNGroup?

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Created Apr ’22

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I'm having trouble converting a CNGroup object to a Data object and back to a CNGroup object. I decided to start rethinking the problem again. Somewhere along the way I decided that I should use the Data class to save a CNGroup object to CloudKit. I also learned that the field type to use in my CKRecord object would be of the type bytes. Am I correct so far? I am able to convert a CNGroup object to a Data object and back again unless I store the Data object in CloudKit and then retrieve it before I convert the Data object back to a CNGroup object, in which case I get an error when I try to access the pointee property of the typed pointer. That would be an UnsafeBufferPointer, an UnsafeMutableBufferPointer, or an UnsafePointer. I've tried a lot of different code using different ways. It is impractical to put so much code in my post. I have used the copyBytes method and the withUnsafeBytes method of the Data object.

There is one simple code, and that is when I converted the CNGroup object to a Data object:

func convertCNGroupToData(fromCNGroup group: inout CNGroup) -> Data {

    return Data(bytes: &group, count: MemoryLayout.size(ofValue: group))

}

I am looking for a simple way to do what I want. I am relooking at Apple's documentation of Data and NSData.

I am not able to be more specific with this question. I appreciate any effort to help me with this.

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Answer 1

MobileTen OP

Apr ’22

CNGroup can be encoded to data and that's it. Performing the reverse is not supported given name & identifier are read-only open properties hence decoding a data stream back to a CNGroup will always never work. Using the CNMutableGroup model will only give you the ability to encode and decode name in both directions but the super implementation of identifier will present the issue of only being able to encode the object to data and not the reverse.

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