I want my script to tell if the removable disk is an SD card or not, so I wrote
the following script.
buf_fmt='HHLLLL'
buf_size=struct.calcsize(buf_fmt)
drives = (drive for drive in win32api.GetLogicalDriveStrings ().split
("\\\000") if drive)
for drive in drives:
if win32file.GetDriveType (drive)==2:
print "Removable Disk" , drive
if 'A' in drive:
print "floppy"
else:
drive="\\\\.\\"+drive+'.'
print drive
hVol = win32file.CreateFile(drive,
win32con.GENERIC_READ|win32con.GENERIC_WRITE,
win32file.FILE_SHARE_READ | win32file.FILE_SHARE_WRITE,
None, win32con.OPEN_EXISTING,
0, None)
if hVol == win32file.INVALID_HANDLE_VALUE:
print "could not open device"
buf=win32file.DeviceIoControl(hVol,
winioctlcon.IOCTL_SFFDISK_QUERY_DEVICE_PROTOCOL,None,buf_size,None)
size_SFFDISK, reserved_SFFDISK,
protocolGUID_SFFDISK=struct.unpack(buf_fmt, buf)
else:
print "Not a removable disk:" , drive
I printed out the drive letter in the script and checked the letter with the SD
card letter on win7. The letters are the same. However, as I mentioned, I
get (1, 'DeviceIoControl', 'Incorrect function').
Thank you,
Jane
>
> Thank you for your help.
> Could you please help me write better codes for GUID? What are you going to
> do with it? You will get back a 20-byte string.
The last 16-bytes are the binary GUID. The way you handle that depends
on what you need to do with it. > You are right. I was using USB.
> Based on your suggestion, I connected the SD drive directly to a PCI
> bus and set buf_fmt='HHLLLL'. However, I got another error message:
> (1, 'DeviceIoControl', 'Incorrect function'). I think I did not use
> the function correctly. How are you specifying the volume? You should be
> using a string like
"\\\\.\\E:" to open the volume for the E: drive (where the backslashes
are doubled because of Python's string escaping). I get "incorrect function" if
I try to use this on a standard disk drive._______________________________________________
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