如何以编程方式检索OS X中的根磁盘分区的UUID？

Question

我可以通过以下代码检索OS X磁盘分区UUID:

void PrintUUID() 
{
    DADiskRef disk;
    CFDictionaryRef descDict;
    DASessionRef session = DASessionCreate(NULL);
    if (session) {
        disk = DADiskCreateFromBSDName(NULL, session, "/dev/disk0s2");
        if (disk) {
            descDict = DADiskCopyDescription(disk);
            if (descDict) {
                CFTypeRef value = (CFTypeRef)CFDictionaryGetValue(descDict,
                    CFSTR("DAVolumeUUID"));
                CFStringRef strValue = CFStringCreateWithFormat(NULL, NULL,
                    CFSTR("%@"), value);
                print(strVal); <------------- here is the output
                CFRelease(strValue);
                CFRelease(descDict);
            }
            CFRelease(disk);
        }
    }
}

上面的代码检索disk0的UUID,我想检索根磁盘的UUID(挂载点= /),如果我使用"/"代替"/ dev/disk0s2",那么DADiskCopyDescription返回NULL.此外,我知道我可以通过此命令在终端中执行此操作:

diskutil info /

简单地说,如何检索根磁盘的BSD名称？(在DADiskCreateFromBSDName中使用它)

有人有想法吗？谢谢.

Answer 1

使用DADiskCreateFromVolumePath而不是DADiskCreateFromBSDName:

char *mountPoint = "/";
CFURLRef url = CFURLCreateFromFileSystemRepresentation(NULL, (const UInt8 *)mountPoint, strlen(mountPoint), TRUE);
disk = DADiskCreateFromVolumePath(NULL, session, url);
CFRelease(url);