[Win32utils-devel] DeviceIoControl + IOCTL_DISK_GET_DRIVE_GEOMETRY problem

[Berger, Daniel]

Hi all,

Ok, what am I doing wrong here?

require 'windows/device_io'
require 'windows/handle'
require 'windows/error'
include Windows::DeviceIO
include Windows::Handle
include Windows::Error

fh = File.open('test.txt') # Assume you have this

handle = get_osfhandle(fh.fileno)

if handle == INVALID_HANDLE_VALUE
   puts "get_osfhandle failed" 
   fh.close
   exit
end

buf   = 0.chr * 24 # sizeof(DISK_GEOMETRY)
bytes = [0].pack('L')

bool = DeviceIoControl(
   handle,
   IOCTL_DISK_GET_DRIVE_GEOMETRY(), # 458752
   nil,
   0,
   buf,
   buf.size,
   bytes,
   0
)

# Fails here
unless bool
   puts "DeviceIoControl failed: " + get_last_error
   fh.close
   exit
End

fh.close

Thanks,

Dan

PS - I've added several IOCTL macro methods to Windows::DeviceIO in CVS
(part of windows-pr).


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