I need to swap the endianness of some values and just wondered if there was anything available in Objective-C, currently I am swapping the bytes with the CStyle function below (which obviously I can reuse) I just wanted to check there was nothing specific I was missing?

float floatFlip(float inFloat) {
    union {
        开发者_运维知识库int intValue;
        float newFloat;
    } inData, outData;

    inData.newFloat = inFloat;
    outData.intValue = CFSwapInt32BigToHost(inData.intValue);
    return(outData.newFloat);
}

EDIT_001

Thanks to the pointers here I have integers sorted, whats the simplest way to swap a float?

int myInteger = CFSwapInt32BigToHost(myInteger);

(Code above updated)

float myFloat = floatFlip(myFloat);

gary

As well as the APIs already mentioned, there is CoreFoundation/CFByteOrder.h.

You're looking for OSSwapInt32() (or OSSwapInt16(), OSSwapInt64(), etc.). See OSByteOrder.h.

Also note that these are non-portable. If you are only converting to big-endian you may want to consider using something like htonl(), which is included in the standard library <arpa/inet.h>. (Unfortunately, though, there is no standard library for simply swapping back-and-forth.)

Have you found

Endian.h    
OSByteOrder.h