Cocoa Unmounting drive but not ejecting it

问题

Do you know you to unmount a drive without ejecting it. NSWorkspace has some methods to unmount drives but it also eject them.

Any idea ?

回答1:

I am doing it as follows and it un-mounts the drive but doesn't eject it.

(Actually I want to eject the disk, I can only un-mount the disk. :P Please share how to eject a disk.)

DASessionRef session = DASessionCreate(kCFAllocatorDefault);

CFURLRef path = CFURLCreateWithString(NULL, CFSTR("<path_to_your_volume_here>"), NULL);
DADiskRef disk = DADiskCreateFromVolumePath(kCFAllocatorDefault, session, path);

DADiskUnmount(disk, kDADiskUnmountOptionDefault, __unmountCallback, NULL);

This is the code I am still working on and is under development and testing.
I am creating the "path" manually. You can use (and share) a better method to get the path of volume in a generic way. Perhaps this answer has hints of doing it the right way.

I'll update when my development is refined and complete.

回答2:

To do this, use DADiskUnmount in DiskArbitration framework.

http://developer.apple.com/library/mac/#documentation/Darwin/Reference/DiscArbitrationFramework/DiskArbitration_h/index.html#//apple_ref/c/func/DADiskUnmount

回答3:

To eject the disk, unmount the disk as you stated, and then in your __unmountCallback do the following:

            DADiskRef disk2 = DADiskCopyWholeDisk(disk);
            DADiskEject(disk2,
                        kDADiskEjectOptionDefault,
                        NULL,
                        NULL);

You can pass any object as context to the DADiskUnmount() and then, for example, use it to determine if the respective disk should be ejected in the __unmountCallback.

来源：https://stackoverflow.com/questions/11513958/cocoa-unmounting-drive-but-not-ejecting-it