Get the volume UUID (DAVolumeUUID)

get_uuid.c

// clang -framework DiskArbitration -framework Carbon disk.c -o disk

#include <Carbon/Carbon.h>

void printUUID()
{
    DADiskRef disk;
    CFDictionaryRef descDict;

    DASessionRef session = DASessionCreate(NULL);

    const char* mountPoint = "/";

    CFURLRef url = CFURLCreateFromFileSystemRepresentation(NULL, (const UInt8*)mountPoint, strlen(mountPoint), TRUE);
    disk = DADiskCreateFromVolumePath(NULL, session, url);
    if (disk) {
        descDict = DADiskCopyDescription(disk);
        if (descDict) {
            CFTypeRef value = (CFTypeRef)CFDictionaryGetValue(descDict,
                CFSTR("DAVolumeUUID"));
            CFStringRef strValue = CFStringCreateWithFormat(NULL, NULL,
                CFSTR("%@"), value);
            printf("%s\n", CFStringGetCStringPtr(strValue, kCFStringEncodingMacRoman));
            CFRelease(strValue);
            CFRelease(descDict);
        }
        CFRelease(disk);
    }

    CFRelease(url);
    CFRelease(session);
}

int main()
{
    printUUID();
}