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UInt8 > NSString

hoi list,

i'm aware my question comes from the lack of knowledge about datatypes and pointers (C, carbon etc..)
but for now i'd like to get this working quickly.

i'm using the 'GetPrimaryMACAddress' example from apple's site in order to retrieve the main MAC-address of the local machine;
http://developer.apple.com/samplecode/GetPrimaryMACAddress/index.html

the example outputs to stdout, now i modified it so that the main() function is a function i can call from cocoa like this:

static char * mainMacAddress()
{
kern_return_t kernResult = KERN_SUCCESS; // on PowerPC this is an int (4 bytes)
io_iterator_t intfIterator;
UInt8 MACAddress[kIOEthernetAddressSize];
char addr[12];
kernResult = FindEthernetInterfaces(&intfIterator);
if (KERN_SUCCESS != kernResult) {
//printf("FindEthernetInterfaces returned 0x%08x\n", kernResult);
sprintf(addr,"000000000000");
} else {
kernResult = GetMACAddress(intfIterator, MACAddress, sizeof (MACAddress));

if (KERN_SUCCESS != kernResult) {
sprintf(addr,"000000000000");
} else {
sprintf(addr,"%02x%02x%02x%02x%02x%02x",
MACAddress[0], MACAddress[1], MACAddress[2], MACAddress[3], MACAddress[4], MACAddress[5]);
}
}
(void) IOObjectRelease(intfIterator); // Release the iterator.
return (char*) addr;
}

and then elsewhere i call that function and create an NSString with the result like this:

char *adr  = mainMacAddress();
macAddress = [NSString stringWithCString:adr];

the compiler gives me a warning (function returns address of local variable), but it works on intel-mac. on ppc it just returns rubbish.

what would be the correct way of doing what i want?

thanks,
arri








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