问题
To get the removable drives i have used GetDriveType ( ) function
Is it possible to check whether a drive is floppy drive or not ?
Please let me know your suggestions on this...
Thank you dor any help
回答1:
Internally Microsoft Windows hold so named characteristics flags (defined in wdm.h) for every device. If device which corresponds the drive letter has flag FILE_FLOPPY_DISKETTE, then the drive is a floppy drive:
//
// Define the various device characteristics flags (defined in wdm.h)
//
#define FILE_REMOVABLE_MEDIA 0x00000001
#define FILE_READ_ONLY_DEVICE 0x00000002
#define FILE_FLOPPY_DISKETTE 0x00000004
#define FILE_WRITE_ONCE_MEDIA 0x00000008
#define FILE_REMOTE_DEVICE 0x00000010
#define FILE_DEVICE_IS_MOUNTED 0x00000020
#define FILE_VIRTUAL_VOLUME 0x00000040
#define FILE_AUTOGENERATED_DEVICE_NAME 0x00000080
#define FILE_DEVICE_SECURE_OPEN 0x00000100
#define FILE_CHARACTERISTIC_PNP_DEVICE 0x00000800
#define FILE_CHARACTERISTIC_TS_DEVICE 0x00001000
#define FILE_CHARACTERISTIC_WEBDAV_DEVICE 0x00002000
To get characteristics flags of a drive you can use different API functions. I find as a most effective and simple way to use NtQueryVolumeInformationFile function from ntdll.dll. Under Get information about disk drives result on windows7 - 32 bit system you will find an example of usage of this API.
UPDATE: You can use NtQueryVolumeInformationFile function directly without previous calls of IOCTL_STORAGE_GET_DEVICE_NUMBER and IOCTL_STORAGE_QUERY_PROPERTY which was called in the example for another reasons.
UPDATED 2: By the way the usage of GetDriveType to test if a drive is removeable is not safe. I have many removable hardware where GetDriveType show the drive as non removeable, but characteristics flags has do has FILE_REMOVABLE_MEDIA bit set. Usage of SetupDiGetDeviceRegistryProperty with SPDRP_REMOVAL_POLICY is also safe. In the last case you should test for CM_REMOVAL_POLICY_EXPECT_SURPRISE_REMOVAL or CM_REMOVAL_POLICY_EXPECT_ORDERLY_REMOVAL like I do this in the example Get information about disk drives result on windows7 - 32 bit system.
回答2:
It's possible - have a look at the following Microsoft Knowledge Base Article.
回答3:
The best chance that I know of is to check if the drive letter is A: or B:. I haven't tried attaching three USB floppy drives to one PC so I don't know if a floppy might have a higher drive letter. Other quirks are possible too. But this test is nearly reliable enough for some purposes.
来源：https://stackoverflow.com/questions/3156284/check-floppy-drive