How can I create a byte array in Objective-C?
I have some data like this:0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89, that I want to prepare as a byte array.
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2 Answers
You can simply use plain C syntax, which is available in Objective-C:
const char myByteArray[] = {
0x12,0x23,0x34,0x45,
0x56,0x67,0x78,0x89,
0x12,0x23,0x34,0x45,
0x56,0x67,0x78,0x89 };
3 Comments
whyoz
what's the difference if an unsigned char was used?
rustyMagnet
I love the C byte array but what happens if you want multiple byte arrays inside
NSArray? Implicit conversion of a non-Objective-C pointer type 'const char *' to 'id _Nonnull' is disallowed with ARC. I like the answerr below from @Georg. NSData *data = [[NSData alloc] initWithBytes:bytes length:sizeof(bytes)]; ?
Max Hiroyuki Ueda
In case I have some data like this (a NSString object) @"0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89", how would I programmatically create an unsigned char array? Thanks in advance!
Either use the plain C solution given by mouviciel or read the class description of NSData and NSMutableData.
1 Comment
whyoz
These links should be updated - NSData: developer.apple.com/documentation/foundation/nsdata - NSMutableData: developer.apple.com/documentation/foundation/nsmutabledata