What kind of CFDataRef is printed out like ""?

Question

I tried using decimal and hexadecimal strings to create a CFDataRef, but what I created not what I need. I need a CFDataRef like "<b1a3c3 d4b5>", Here is my code:

CFDataRef abc = CFDataCreate(kCFAllocatorDefault, "b034958b0c6f",strlen("b034958b0c6f"));
CFDataRef abc = CFDataCreate(kCFAllocatorDefault, "4294967295", strlen("4294967295"));

You mean https://stackoverflow.com/questions/7520615/how-to-convert-an-nsdata-into-an-nsstring-hex-string ? Then, there should be a bridge between CFDataRef & NSData — Larme, Sep 15 '17 at 17:16
The second argument to `CFDataCreate` is the raw bytes to store in the data. You can't pass a hexadecimal string. — Lily Ballard, Sep 15 '17 at 18:16

score 1 · Accepted Answer · answered Sep 17 '17 at 03:43

1

@kevin is correct, you need to pass the raw bytes.

UInt8 bytes[] = { 0xb1, 0xa3, 0xc3, 0xd4, 0xb5 };
CFDataRef abc = CFDataCreate(kCFAllocatorDefault, bytes, sizeof(bytes));

answered Sep 17 '17 at 03:43

Leland Wallace

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What kind of CFDataRef is printed out like ""?

1 Answers1