Getting the computer's serial number

Question

Hi. I want to fetch computer's serial number. For this i m using the following code in cocoa objective c.
This is using a carbon API. so i have included the following lines in my code
#import <Carbon/Carbon.h>
#import <SystemConfiguration/SystemConfiguration.h>
+ (NSString *)computerSerialNumber
machportt masterPort;
kernreturnt kr = noErr;
ioregistry_entryt entry;
CFTypeRef prop;
CFTypeID propID;
NSString* str = nil;
kr = IOMasterPort (MACHPORTNULL, &masterPort);
if( kr != noErr )
goto cleanup;
entry = IORegistryGetRootEntry ( masterPort );
if( entry == MACHPORTNULL )
goto cleanup;
prop = IORegistryEntrySearchCFProperty (entry, kIODeviceTreePlane, CFSTR("serial-number"), nil, kIORegistryIterateRecursively);
if( prop == nil )
goto cleanup;
propID = CFGetTypeID( prop );
if( propID != CFDataGetTypeID() )
goto cleanup;
const char* buf = [(NSData*)prop bytes];
int len = [(NSData*)prop length],
x;
char secondPart[256];
char firstPart[256];
char* currStr = secondPart; // Version number starts with second part, then NULLs, then first part.
int y = 0;
for( x = 0; x < len; x++ )
if( buf[x] > 0 && (y < 255) )
currStr[y++] = buf[x];
else if( currStr == secondPart )
currStr[y] = 0; // Terminate string.
currStr = firstPart;
y = 0;
currStr[y] = 0; // Terminate string.
str = [NSString stringWithFormat: @"%s%s", firstPart, secondPart];
cleanup:
machportdeallocate( machtaskself(), masterPort );
return str;
But it is generating following errors for the lines which i have shown underline to that words in the above code
"_IORegistryEntrySearchCFProperty", referenced from:
"_IOMasterPort", referenced from:
"_IORegistryGetRootEntry", referenced from:

Answer 1

Did you add IOKit.framework to your project under Frameworks?