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GET_PARTITION_INFO in Windows NT

ILIIA
ILIIA asked
on
Medium Priority
802 Views
Last Modified: 2013-12-04
I've got a program:
      partitionHandle = CreateFile("\\\\.\\C:",
            0,
            FILE_SHARE_WRITE,
            NULL,
            OPEN_EXISTING,
            FILE_ATTRIBUTE_NORMAL,
            NULL);
      
      if(partitionHandle == INVALID_HANDLE_VALUE)
      {
            AfxMessageBox("Can't open RAID device",
                  MB_OK, 0);
            return;
      }


      if(!DeviceIoControl(partitionHandle,
            IOCTL_DISK_GET_PARTITION_INFO,
            NULL,
            0,
            &partitionInfo,
            sizeof(PARTITION_INFORMATION),
            &regResult,
            NULL))
      {
            
FormatMessage(
    FORMAT_MESSAGE_FROM_SYSTEM,
    NULL,
    GetLastError(),
    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
    raidRoot,
    64,
    NULL);

            
            
            AfxMessageBox("Can't get RAID info",
                  MB_OK, 0);
            CloseHandle(partitionHandle);      
            return;
      }
      
Now what I got in a msg.string is "Access denied".
I've tried to run it as Administrator with same result.
So what's wrong or/and how could I get partition info in
Windows NT?
Comment
Watch Question

Commented:
You need to pass GENERIC_READ to CreateFile().

The documentation implies that you can query the device driver by using 0 for the dwDesiredAccess parameter, and that's true.  But the thing is that the disk driver will end up needing to read the physical device to answer your query, so you need to make sure the handle you pass has adequate access.

I think you should use FILE_SHARE_WRITE | FILE_SHARE_READ, by the way, instead of locking the drive for writes.

Finally, your code is leaky: if you successfully read the information, you never close the handle you created.  You need to CloseHandle() wether the DeviceIOControl() call failed or not.

.B ekiM

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