问题
From Objective C (or Swift), I need to determine if a mounted volume is a Disk Image (mounted from a .dmg file).
Similar questions led me to NSURL Volume Property Keys, but none of them seem to give the type/protocol of the volume.
However, I can see this information with the terminal diskutil
function under Protocol
:
~/Temp$ diskutil info /dev/disk8
Device Identifier: disk8
Device Node: /dev/disk8
Part of Whole: disk8
Device / Media Name: Apple UDIF read-only Media
Volume Name: Not applicable (no file system)
Mounted: Not applicable (no file system)
File System: None
Content (IOContent): GUID_partition_scheme
OS Can Be Installed: No
Media Type: Generic
Protocol: Disk Image <=== THIS IS WHAT I WANT
SMART Status: Not Supported
Total Size: 5.2 MB (5242880 Bytes) (exactly 10240 512-Byte-Units)
Volume Free Space: Not applicable (no file system)
Device Block Size: 512 Bytes
Read-Only Media: Yes
Read-Only Volume: Not applicable (no file system)
Ejectable: Yes
Whole: Yes
Internal: No
OS 9 Drivers: No
Low Level Format: Not supported
EDIT: Found some code that at least used to do this, by means of this included category extension to NSWorkspace. However, it is pre-ARC and I'm not sure if it would still work.
Found it via this partial answer on other question..
回答1:
You can obtain this information using the DiskArbitration framework. To use the example below, you must link against and #import
it.
#import <DiskArbitration/DiskArbitration.h>
...
- (BOOL)isDMGVolumeAtURL:(NSURL *)url
{
BOOL isDMG = NO;
if (url.isFileURL) {
DASessionRef session = DASessionCreate(kCFAllocatorDefault);
if (session != nil) {
DADiskRef disk = DADiskCreateFromVolumePath(kCFAllocatorDefault, session, (__bridge CFURLRef)url);
if (disk != nil) {
NSDictionary * desc = CFBridgingRelease(DADiskCopyDescription(disk));
NSString * model = desc[(NSString *)kDADiskDescriptionDeviceModelKey];
isDMG = ([model isEqualToString:@"Disk Image"]);
CFRelease(disk);
}
CFRelease(session);
}
}
return isDMG;
}
Usage:
BOOL isDMG = [someObject isDMGVolumeAtURL:[NSURL fileURLWithPath:@"/Volumes/Some Volume"]];
I hope this helps.
来源:https://stackoverflow.com/questions/31545381/determine-if-a-volume-is-a-disk-image-dmg-from-code