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GET_PARTITION_INFO in Windows NT

Posted on 1997-02-10
1
Medium Priority
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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?
0
Comment
Question by:ILIIA
1 Comment
 
LVL 11

Accepted Solution

by:
mikeblas earned 100 total points
ID: 1298760
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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