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iphoneobjective-cnsdataarrays

Convert unsigned char array to NSData and back

How do you convert an unsigned char array to an NSData in objective c?

This is what I am trying to do, but it doesn't work. Buffer is my unsigned char array.

NSData *data = [NSData dataWithBytes:message length:length];
Solution

  • You can just use this NSData class method

    + (id)dataWithBytes:(const void *)bytes length:(NSUInteger)length

    Something like

    NSUInteger size = // some size
unsigned char array[size];
NSData* data = [NSData dataWithBytes:(const void *)array length:sizeof(unsigned char)*size];

    You can then get the array back like this (if you know that it is the right data type)

    NSUInteger size = [data length] / sizeof(unsigned char);
unsigned char* array = (unsigned char*) [data bytes];