How to convert NSString to C string?

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I know that this question is a possible duplicate, but even after looking at some Google tutorials and questions even on this forum none of them gives me a decent answer about this subject.

I have:

NSString *str = @"text";

And I would like to do something like:

char cstring [512] = str;

(this only shows what I want to do, after looking at Apple's NSString Class Ref I didn't even think about using it).

Up to now I have:

char command [512] = [[NSString stringWithFormat:@"text"] cStringUsingEncoding:NSUTF8StringEncoding];

Still, with that I get errors.

Any solution?

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