Can I add a C array into a objective-C NSArray?
NSArray * testArray = [NSArray arrayWithObjects:
@"obj1",
{"C array obj1", "C array obj2"},
nil];
gives me Expected Expression message error.
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1 Answer
You cannot add plain C arrays to NSArray.
But as storing a C array means storing a pointer, you can wrap that pointer into an NSValue and store that instead:
char *someCArray = ...;
NSArray *array = @[[NSValue valueWithPointer:someCArrray]];
Keep in mind that you are only storing the pointer - and memory management is still up to you.
Or you could wrap the memory of the array into some Objective-C object, like NSData, but there should be very good reasons to go to such lengths.
My guess in the wild is - without knowing the concrete use case - that you're better of converting the C data into objects themselves and store them "the Objective-C" way.
3 Comments
aneuryzm
Is there an inline notation so that I don't need to declare the variable someCarray?
Eiko
@Patrick Where does the array come from, then? Some code must create it (and allocate its memory) - you certainly don't want to store a pointer to a short-lived slice of stack memory. And if you're just creating it, the question is, why use a C array here?
Eiko
@dasblinkenlight Indeed bad wording on my part. Will edit the answer.